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diff --git a/contracts/child/ChildToken/ChildMintableERC1155.sol b/contracts/child/ChildToken/ChildMintableERC1155.sol new file mode 100644 index 00000000..ac0d052d --- /dev/null +++ b/contracts/child/ChildToken/ChildMintableERC1155.sol @@ -0,0 +1,115 @@ +pragma solidity 0.6.6; + +import {ERC1155} from "@openzeppelin/contracts/token/ERC1155/ERC1155.sol"; +import {AccessControlMixin} from "../../common/AccessControlMixin.sol"; +import {IChildToken} from "./IChildToken.sol"; +import {NativeMetaTransaction} from "../../common/NativeMetaTransaction.sol"; +import {ContextMixin} from "../../common/ContextMixin.sol"; + +contract ChildMintableERC1155 is + ERC1155, + IChildToken, + AccessControlMixin, + NativeMetaTransaction, + ContextMixin +{ + bytes32 public constant DEPOSITOR_ROLE = keccak256("DEPOSITOR_ROLE"); + + constructor(string memory uri_, address childChainManager) + public + ERC1155(uri_) + { + _setupContractId("ChildMintableERC1155"); + _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); + _setupRole(DEPOSITOR_ROLE, childChainManager); + _initializeEIP712(uri_); + } + + // This is to support Native meta transactions + // never use msg.sender directly, use _msgSender() instead + function _msgSender() + internal + override + view + returns (address payable sender) + { + return ContextMixin.msgSender(); + } + + /** + * @notice called when tokens are deposited on root chain + * @dev Should be callable only by ChildChainManager + * Should handle deposit by minting the required tokens for user + * Make sure minting is done only by this function + * @param user user address for whom deposit is being done + * @param depositData abi encoded ids array and amounts array + */ + function deposit(address user, bytes calldata depositData) + external + override + only(DEPOSITOR_ROLE) + { + ( + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) = abi.decode(depositData, (uint256[], uint256[], bytes)); + + require( + user != address(0), + "ChildMintableERC1155: INVALID_DEPOSIT_USER" + ); + + _mintBatch(user, ids, amounts, data); + } + + /** + * @notice called when user wants to withdraw single token back to root chain + * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain + * @param id id to withdraw + * @param amount amount to withdraw + */ + function withdrawSingle(uint256 id, uint256 amount) external { + _burn(_msgSender(), id, amount); + } + + /** + * @notice called when user wants to batch withdraw tokens back to root chain + * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain + * @param ids ids to withdraw + * @param amounts amounts to withdraw + */ + function withdrawBatch(uint256[] calldata ids, uint256[] calldata amounts) + external + { + _burnBatch(_msgSender(), ids, amounts); + } + + /** + * @notice See definition of `_mint` in ERC1155 contract + * @dev This implementation only allows admins to mint tokens + * but can be changed as per requirement + */ + function mint( + address account, + uint256 id, + uint256 amount, + bytes calldata data + ) external only(DEFAULT_ADMIN_ROLE) { + _mint(account, id, amount, data); + } + + /** + * @notice See definition of `_mintBatch` in ERC1155 contract + * @dev This implementation only allows admins to mint tokens + * but can be changed as per requirement + */ + function mintBatch( + address to, + uint256[] calldata ids, + uint256[] calldata amounts, + bytes calldata data + ) external only(DEFAULT_ADMIN_ROLE) { + _mintBatch(to, ids, amounts, data); + } +} diff --git a/contracts/child/ChildToken/ChildMintableERC20.sol b/contracts/child/ChildToken/ChildMintableERC20.sol new file mode 100644 index 00000000..b0f280ea --- /dev/null +++ b/contracts/child/ChildToken/ChildMintableERC20.sol @@ -0,0 +1,79 @@ +pragma solidity 0.6.6; + +import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; +import {AccessControlMixin} from "../../common/AccessControlMixin.sol"; +import {IChildToken} from "./IChildToken.sol"; +import {NativeMetaTransaction} from "../../common/NativeMetaTransaction.sol"; +import {ContextMixin} from "../../common/ContextMixin.sol"; + + +contract ChildMintableERC20 is + ERC20, + IChildToken, + AccessControlMixin, + NativeMetaTransaction, + ContextMixin +{ + bytes32 public constant DEPOSITOR_ROLE = keccak256("DEPOSITOR_ROLE"); + + constructor( + string memory name_, + string memory symbol_, + uint8 decimals_, + address childChainManager + ) public ERC20(name_, symbol_) { + _setupContractId("ChildMintableERC20"); + _setupDecimals(decimals_); + _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); + _setupRole(DEPOSITOR_ROLE, childChainManager); + _initializeEIP712(name_); + } + + // This is to support Native meta transactions + // never use msg.sender directly, use _msgSender() instead + function _msgSender() + internal + override + view + returns (address payable sender) + { + return ContextMixin.msgSender(); + } + + /** + * @notice called when token is deposited on root chain + * @dev Should be callable only by ChildChainManager + * Should handle deposit by minting the required amount for user + * Make sure minting is done only by this function + * @param user user address for whom deposit is being done + * @param depositData abi encoded amount + */ + function deposit(address user, bytes calldata depositData) + external + override + only(DEPOSITOR_ROLE) + { + uint256 amount = abi.decode(depositData, (uint256)); + _mint(user, amount); + } + + /** + * @notice called when user wants to withdraw tokens back to root chain + * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain + * @param amount amount of tokens to withdraw + */ + function withdraw(uint256 amount) external { + _burn(_msgSender(), amount); + } + + /** + * @notice Example function to handle minting tokens on matic chain + * @dev Minting can be done as per requirement, + * This implementation allows only admin to mint tokens but it can be changed as per requirement + * @param user user for whom tokens are being minted + * @param amount amount of token to mint + */ + function mint(address user, uint256 amount) public only(DEFAULT_ADMIN_ROLE) { + _mint(user, amount); + } +} diff --git a/contracts/root/RootToken/DummyMintableERC1155.sol b/contracts/root/RootToken/DummyMintableERC1155.sol new file mode 100644 index 00000000..da4ec9ed --- /dev/null +++ b/contracts/root/RootToken/DummyMintableERC1155.sol @@ -0,0 +1,52 @@ +pragma solidity 0.6.6; + +import {ERC1155} from "@openzeppelin/contracts/token/ERC1155/ERC1155.sol"; +import {IMintableERC1155} from "./IMintableERC1155.sol"; +import {NativeMetaTransaction} from "../../common/NativeMetaTransaction.sol"; +import {ContextMixin} from "../../common/ContextMixin.sol"; +import {AccessControlMixin} from "../../common/AccessControlMixin.sol"; + +contract DummyMintableERC1155 is + ERC1155, + AccessControlMixin, + NativeMetaTransaction, + ContextMixin, + IMintableERC1155 +{ + bytes32 public constant PREDICATE_ROLE = keccak256("PREDICATE_ROLE"); + + constructor(string memory uri_) public ERC1155(uri_) { + _setupContractId("DummyMintableERC1155"); + _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); + _setupRole(PREDICATE_ROLE, _msgSender()); + + _initializeEIP712(uri_); + } + + function mint( + address account, + uint256 id, + uint256 amount, + bytes calldata data + ) external override only(PREDICATE_ROLE) { + _mint(account, id, amount, data); + } + + function mintBatch( + address to, + uint256[] calldata ids, + uint256[] calldata amounts, + bytes calldata data + ) external override only(PREDICATE_ROLE) { + _mintBatch(to, ids, amounts, data); + } + + function _msgSender() + internal + override + view + returns (address payable sender) + { + return ContextMixin.msgSender(); + } +} diff --git a/contracts/root/RootToken/DummyMintableERC20.sol b/contracts/root/RootToken/DummyMintableERC20.sol new file mode 100644 index 00000000..9963bd72 --- /dev/null +++ b/contracts/root/RootToken/DummyMintableERC20.sol @@ -0,0 +1,45 @@ +pragma solidity 0.6.6; + +import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; +import {IMintableERC20} from "./IMintableERC20.sol"; +import {NativeMetaTransaction} from "../../common/NativeMetaTransaction.sol"; +import {ContextMixin} from "../../common/ContextMixin.sol"; +import {AccessControlMixin} from "../../common/AccessControlMixin.sol"; + +contract DummyMintableERC20 is + ERC20, + AccessControlMixin, + NativeMetaTransaction, + ContextMixin, + IMintableERC20 +{ + bytes32 public constant PREDICATE_ROLE = keccak256("PREDICATE_ROLE"); + + constructor(string memory name_, string memory symbol_) + public + ERC20(name_, symbol_) + { + _setupContractId("DummyMintableERC20"); + _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); + _setupRole(PREDICATE_ROLE, _msgSender()); + + _mint(_msgSender(), 10**10 * (10**18)); + _initializeEIP712(name_); + } + + /** + * @dev See {IMintableERC20-mint}. + */ + function mint(address user, uint256 amount) external override only(PREDICATE_ROLE) { + _mint(user, amount); + } + + function _msgSender() + internal + override + view + returns (address payable sender) + { + return ContextMixin.msgSender(); + } +} diff --git a/contracts/root/RootToken/IMintableERC1155.sol b/contracts/root/RootToken/IMintableERC1155.sol new file mode 100644 index 00000000..7cf8b1d8 --- /dev/null +++ b/contracts/root/RootToken/IMintableERC1155.sol @@ -0,0 +1,29 @@ +import {IERC1155} from "@openzeppelin/contracts/token/ERC1155/IERC1155.sol"; + +pragma solidity 0.6.6; + +interface IMintableERC1155 is IERC1155 { + /** + * @notice Creates `amount` tokens of token type `id`, and assigns them to `account`. + * @dev Should be callable only by MintableERC1155Predicate + * Make sure minting is done only by this function + * @param account user address for whom token is being minted + * @param id token which is being minted + * @param amount amount of token being minted + * @param data extra byte data to be accompanied with minted tokens + */ + function mint(address account, uint256 id, uint256 amount, bytes calldata data) external; + + /** + * @notice Batched version of singular token minting, where + * for each token in `ids` respective amount to be minted from `amounts` + * array, for address `to`. + * @dev Should be callable only by MintableERC1155Predicate + * Make sure minting is done only by this function + * @param to user address for whom token is being minted + * @param ids tokens which are being minted + * @param amounts amount of each token being minted + * @param data extra byte data to be accompanied with minted tokens + */ + function mintBatch(address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external; +} diff --git a/contracts/root/RootToken/IMintableERC20.sol b/contracts/root/RootToken/IMintableERC20.sol new file mode 100644 index 00000000..bcae3615 --- /dev/null +++ b/contracts/root/RootToken/IMintableERC20.sol @@ -0,0 +1,14 @@ +import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; + +pragma solidity 0.6.6; + +interface IMintableERC20 is IERC20 { + /** + * @notice called by predicate contract to mint tokens while withdrawing + * @dev Should be callable only by MintableERC20Predicate + * Make sure minting is done only by this function + * @param user user address for whom token is being minted + * @param amount amount of token being minted + */ + function mint(address user, uint256 amount) external; +} diff --git a/contracts/root/TokenPredicates/MintableERC1155Predicate.sol b/contracts/root/TokenPredicates/MintableERC1155Predicate.sol new file mode 100644 index 00000000..ed7c3029 --- /dev/null +++ b/contracts/root/TokenPredicates/MintableERC1155Predicate.sol @@ -0,0 +1,253 @@ +pragma solidity 0.6.6; + +import {IMintableERC1155} from "../RootToken/IMintableERC1155.sol"; +import { + ERC1155Receiver +} from "@openzeppelin/contracts/token/ERC1155/ERC1155Receiver.sol"; +import {AccessControlMixin} from "../../common/AccessControlMixin.sol"; +import {RLPReader} from "../../lib/RLPReader.sol"; +import {ITokenPredicate} from "./ITokenPredicate.sol"; +import {Initializable} from "../../common/Initializable.sol"; + +contract MintableERC1155Predicate is + ITokenPredicate, + ERC1155Receiver, + AccessControlMixin, + Initializable +{ + using RLPReader for bytes; + using RLPReader for RLPReader.RLPItem; + + bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE"); + bytes32 public constant TOKEN_TYPE = keccak256("MintableERC1155"); + + bytes32 public constant TRANSFER_SINGLE_EVENT_SIG = keccak256( + "TransferSingle(address,address,address,uint256,uint256)" + ); + bytes32 public constant TRANSFER_BATCH_EVENT_SIG = keccak256( + "TransferBatch(address,address,address,uint256[],uint256[])" + ); + + event LockedBatchMintableERC1155( + address indexed depositor, + address indexed depositReceiver, + address indexed rootToken, + uint256[] ids, + uint256[] amounts + ); + + constructor() public {} + + function initialize(address _owner) external initializer { + _setupContractId("MintableERC1155Predicate"); + _setupRole(DEFAULT_ADMIN_ROLE, _owner); + _setupRole(MANAGER_ROLE, _owner); + } + + /** + * @notice rejects single transfer + */ + function onERC1155Received( + address, + address, + uint256, + uint256, + bytes calldata + ) external override returns (bytes4) { + return 0; + } + + /** + * @notice accepts batch transfer + */ + function onERC1155BatchReceived( + address, + address, + uint256[] calldata, + uint256[] calldata, + bytes calldata + ) external override returns (bytes4) { + return ERC1155Receiver(0).onERC1155BatchReceived.selector; + } + + /** + * @notice Lock ERC1155 tokens for deposit, callable only by manager + * @param depositor Address who wants to deposit tokens + * @param depositReceiver Address (address) who wants to receive tokens on child chain + * @param rootToken Token which gets deposited + * @param depositData ABI encoded id array and amount array + */ + function lockTokens( + address depositor, + address depositReceiver, + address rootToken, + bytes calldata depositData + ) external override only(MANAGER_ROLE) { + // forcing batch deposit since supporting both single and batch deposit introduces too much complexity + ( + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) = abi.decode(depositData, (uint256[], uint256[], bytes)); + + emit LockedBatchMintableERC1155( + depositor, + depositReceiver, + rootToken, + ids, + amounts + ); + IMintableERC1155(rootToken).safeBatchTransferFrom( + depositor, + address(this), + ids, + amounts, + data + ); + } + + /** + * @notice Creates an array of `size` by repeating provided address, + * to be required for passing to batch balance checking function of ERC1155 tokens. + * @param addr Address to be repeated `size` times in resulting array + * @param size Size of resulting array + */ + function makeArrayWithAddress(address addr, uint256 size) + internal + pure + returns (address[] memory) + { + require( + addr != address(0), + "MintableERC1155Predicate: Invalid address" + ); + require( + size > 0, + "MintableERC1155Predicate: Invalid resulting array length" + ); + + address[] memory addresses = new address[](size); + + for (uint256 i = 0; i < size; i++) { + addresses[i] = addr; + } + + return addresses; + } + + /** + * @notice Calculates amount of tokens to be minted, by subtracting available + * token balances from amount of tokens to be exited + * @param tokenBalances Token balances this contract holds for some ordered token ids + * @param amountsToBeExited Amount of tokens being exited + */ + function calculateAmountsToBeMinted( + uint256[] memory tokenBalances, + uint256[] memory amountsToBeExited + ) internal pure returns (uint256[] memory) { + require( + tokenBalances.length == amountsToBeExited.length, + "MintableERC1155Predicate: Array length mismatch found" + ); + + uint256[] memory toBeMintedAmounts = new uint256[]( + tokenBalances.length + ); + + // Iteratively calculating amounts of token to be minted + // + // Please note, in some cases it can be 0, but that will not + // be a problem, due to implementation of mint logic for ERC1155 + for (uint256 i = 0; i < tokenBalances.length; i++) { + if (tokenBalances[i] < amountsToBeExited[i]) { + toBeMintedAmounts[i] = amountsToBeExited[i] - tokenBalances[i]; + } + } + + return toBeMintedAmounts; + } + + /** + * @notice Validates log signature, from and to address + * then sends the correct tokenId, amount to withdrawer + * callable only by manager + * @param rootToken Token which gets withdrawn + * @param log Valid ERC1155 TransferSingle burn or TransferBatch burn log from child chain + */ + function exitTokens( + address, + address rootToken, + bytes memory log + ) public override only(MANAGER_ROLE) { + RLPReader.RLPItem[] memory logRLPList = log.toRlpItem().toList(); + RLPReader.RLPItem[] memory logTopicRLPList = logRLPList[1].toList(); // topics + bytes memory logData = logRLPList[2].toBytes(); + + address withdrawer = address(logTopicRLPList[2].toUint()); // topic2 is from address + + require( + address(logTopicRLPList[3].toUint()) == address(0), // topic3 is to address + "MintableERC1155Predicate: INVALID_RECEIVER" + ); + + if (bytes32(logTopicRLPList[0].toUint()) == TRANSFER_SINGLE_EVENT_SIG) { + // topic0 is event sig + (uint256 id, uint256 amount) = abi.decode( + logData, + (uint256, uint256) + ); + + IMintableERC1155 token = IMintableERC1155(rootToken); + // Currently locked tokens for `id` in this contract + uint256 tokenBalance = token.balanceOf(address(this), id); + + // Checking whether MintableERC1155 contract has enough + // tokens locked in to transfer to withdrawer, if not + // it'll mint those tokens for this contract and return + // safely transfer those to withdrawer + if (tokenBalance < amount) { + token.mint(address(this), id, amount - tokenBalance, bytes("")); + } + + token.safeTransferFrom( + address(this), + withdrawer, + id, + amount, + bytes("") + ); + } else if ( + bytes32(logTopicRLPList[0].toUint()) == TRANSFER_BATCH_EVENT_SIG + ) { + (uint256[] memory ids, uint256[] memory amounts) = abi.decode( + logData, + (uint256[], uint256[]) + ); + + IMintableERC1155 token = IMintableERC1155(rootToken); + + token.mintBatch( + address(this), + ids, + calculateAmountsToBeMinted( + token.balanceOfBatch( + makeArrayWithAddress(address(this), ids.length), + ids + ), + amounts + ), + bytes("") + ); + + IMintableERC1155(rootToken).safeBatchTransferFrom( + address(this), + withdrawer, + ids, + amounts, + bytes("") + ); + } else { + revert("MintableERC1155Predicate: INVALID_WITHDRAW_SIG"); + } + } +} diff --git a/contracts/root/TokenPredicates/MintableERC1155PredicateProxy.sol b/contracts/root/TokenPredicates/MintableERC1155PredicateProxy.sol new file mode 100644 index 00000000..1bbfb35f --- /dev/null +++ b/contracts/root/TokenPredicates/MintableERC1155PredicateProxy.sol @@ -0,0 +1,10 @@ +pragma solidity 0.6.6; + +import {UpgradableProxy} from "../../common/Proxy/UpgradableProxy.sol"; + +contract MintableERC1155PredicateProxy is UpgradableProxy { + constructor(address _proxyTo) + public + UpgradableProxy(_proxyTo) + {} +} diff --git a/contracts/root/TokenPredicates/MintableERC20Predicate.sol b/contracts/root/TokenPredicates/MintableERC20Predicate.sol new file mode 100644 index 00000000..c0f5aa00 --- /dev/null +++ b/contracts/root/TokenPredicates/MintableERC20Predicate.sol @@ -0,0 +1,104 @@ +pragma solidity 0.6.6; + +import {IMintableERC20} from "../RootToken/IMintableERC20.sol"; +import {AccessControlMixin} from "../../common/AccessControlMixin.sol"; +import {RLPReader} from "../../lib/RLPReader.sol"; +import {ITokenPredicate} from "./ITokenPredicate.sol"; +import {Initializable} from "../../common/Initializable.sol"; + +contract MintableERC20Predicate is + ITokenPredicate, + AccessControlMixin, + Initializable +{ + using RLPReader for bytes; + using RLPReader for RLPReader.RLPItem; + + bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE"); + bytes32 public constant TOKEN_TYPE = keccak256("MintableERC20"); + bytes32 public constant TRANSFER_EVENT_SIG = keccak256( + "Transfer(address,address,uint256)" + ); + + event LockedMintableERC20( + address indexed depositor, + address indexed depositReceiver, + address indexed rootToken, + uint256 amount + ); + + constructor() public {} + + function initialize(address _owner) external initializer { + _setupContractId("MintableERC20Predicate"); + _setupRole(DEFAULT_ADMIN_ROLE, _owner); + _setupRole(MANAGER_ROLE, _owner); + } + + /** + * @notice Lock ERC20 tokens for deposit, callable only by manager + * @param depositor Address who wants to deposit tokens + * @param depositReceiver Address (address) who wants to receive tokens on child chain + * @param rootToken Token which gets deposited + * @param depositData ABI encoded amount + */ + function lockTokens( + address depositor, + address depositReceiver, + address rootToken, + bytes calldata depositData + ) external override only(MANAGER_ROLE) { + uint256 amount = abi.decode(depositData, (uint256)); + + emit LockedMintableERC20(depositor, depositReceiver, rootToken, amount); + IMintableERC20(rootToken).transferFrom( + depositor, + address(this), + amount + ); + } + + /** + * @notice Validates log signature, from and to address + * then sends the correct amount to withdrawer + * callable only by manager + * @param rootToken Token which gets withdrawn + * @param log Valid ERC20 burn log from child chain + */ + function exitTokens( + address, + address rootToken, + bytes memory log + ) public override only(MANAGER_ROLE) { + RLPReader.RLPItem[] memory logRLPList = log.toRlpItem().toList(); + RLPReader.RLPItem[] memory logTopicRLPList = logRLPList[1].toList(); // topics + + require( + bytes32(logTopicRLPList[0].toUint()) == TRANSFER_EVENT_SIG, // topic0 is `Transfer` event sig + "MintableERC20Predicate: INVALID_SIGNATURE" + ); + + address withdrawer = address(logTopicRLPList[1].toUint()); // topic1 is `from` address + + require( + address(logTopicRLPList[2].toUint()) == address(0), // topic2 is `to` address + "MintableERC20Predicate: INVALID_RECEIVER" + ); + + IMintableERC20 token = IMintableERC20(rootToken); + + uint256 tokenBalance = token.balanceOf(address(this)); + uint256 amount = logRLPList[2].toUint(); + + // Checking whether MintableERC20Predicate has enough balance + // to transfer `amount` to withdrawer or not + // + // If no, it'll mint those extra tokens & transfer `amount` + // to withdrawer + if (tokenBalance < amount) { + token.mint(address(this), amount - tokenBalance); + } + + token.transfer(withdrawer, amount); + } +} diff --git a/contracts/root/TokenPredicates/MintableERC20PredicateProxy.sol b/contracts/root/TokenPredicates/MintableERC20PredicateProxy.sol new file mode 100644 index 00000000..af0adeb4 --- /dev/null +++ b/contracts/root/TokenPredicates/MintableERC20PredicateProxy.sol @@ -0,0 +1,10 @@ +pragma solidity 0.6.6; + +import {UpgradableProxy} from "../../common/Proxy/UpgradableProxy.sol"; + +contract MintableERC20PredicateProxy is UpgradableProxy { + constructor(address _proxyTo) + public + UpgradableProxy(_proxyTo) + {} +} diff --git a/flat/ChildMintableERC1155.sol b/flat/ChildMintableERC1155.sol new file mode 100644 index 00000000..4a841241 --- /dev/null +++ b/flat/ChildMintableERC1155.sol @@ -0,0 +1,1852 @@ + +// File: @openzeppelin/contracts/introspection/IERC165.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Interface of the ERC165 standard, as defined in the + * https://eips.ethereum.org/EIPS/eip-165[EIP]. + * + * Implementers can declare support of contract interfaces, which can then be + * queried by others ({ERC165Checker}). + * + * For an implementation, see {ERC165}. + */ +interface IERC165 { + /** + * @dev Returns true if this contract implements the interface defined by + * `interfaceId`. See the corresponding + * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] + * to learn more about how these ids are created. + * + * This function call must use less than 30 000 gas. + */ + function supportsInterface(bytes4 interfaceId) external view returns (bool); +} + +// File: @openzeppelin/contracts/token/ERC1155/IERC1155.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + + +/** + * @dev Required interface of an ERC1155 compliant contract, as defined in the + * https://eips.ethereum.org/EIPS/eip-1155[EIP]. + * + * _Available since v3.1._ + */ +interface IERC1155 is IERC165 { + /** + * @dev Emitted when `value` tokens of token type `id` are transfered from `from` to `to` by `operator`. + */ + event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value); + + /** + * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all + * transfers. + */ + event TransferBatch(address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values); + + /** + * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to + * `approved`. + */ + event ApprovalForAll(address indexed account, address indexed operator, bool approved); + + /** + * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI. + * + * If an {URI} event was emitted for `id`, the standard + * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value + * returned by {IERC1155MetadataURI-uri}. + */ + event URI(string value, uint256 indexed id); + + /** + * @dev Returns the amount of tokens of token type `id` owned by `account`. + * + * Requirements: + * + * - `account` cannot be the zero address. + */ + function balanceOf(address account, uint256 id) external view returns (uint256); + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}. + * + * Requirements: + * + * - `accounts` and `ids` must have the same length. + */ + function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory); + + /** + * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`, + * + * Emits an {ApprovalForAll} event. + * + * Requirements: + * + * - `operator` cannot be the caller. + */ + function setApprovalForAll(address operator, bool approved) external; + + /** + * @dev Returns true if `operator` is approved to transfer ``account``'s tokens. + * + * See {setApprovalForAll}. + */ + function isApprovedForAll(address account, address operator) external view returns (bool); + + /** + * @dev Transfers `amount` tokens of token type `id` from `from` to `to`. + * + * Emits a {TransferSingle} event. + * + * Requirements: + * + * - `to` cannot be the zero address. + * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}. + * - `from` must have a balance of tokens of type `id` of at least `amount`. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the + * acceptance magic value. + */ + function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external; + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}. + * + * Emits a {TransferBatch} event. + * + * Requirements: + * + * - `ids` and `amounts` must have the same length. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the + * acceptance magic value. + */ + function safeBatchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external; +} + +// File: @openzeppelin/contracts/token/ERC1155/IERC1155MetadataURI.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + + +/** + * @dev Interface of the optional ERC1155MetadataExtension interface, as defined + * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP]. + * + * _Available since v3.1._ + */ +interface IERC1155MetadataURI is IERC1155 { + /** + * @dev Returns the URI for token type `id`. + * + * If the `\{id\}` substring is present in the URI, it must be replaced by + * clients with the actual token type ID. + */ + function uri(uint256 id) external view returns (string memory); +} + +// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + +/** + * _Available since v3.1._ + */ +interface IERC1155Receiver is IERC165 { + + /** + @dev Handles the receipt of a single ERC1155 token type. This function is + called at the end of a `safeTransferFrom` after the balance has been updated. + To accept the transfer, this must return + `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` + (i.e. 0xf23a6e61, or its own function selector). + @param operator The address which initiated the transfer (i.e. msg.sender) + @param from The address which previously owned the token + @param id The ID of the token being transferred + @param value The amount of tokens being transferred + @param data Additional data with no specified format + @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed + */ + function onERC1155Received( + address operator, + address from, + uint256 id, + uint256 value, + bytes calldata data + ) + external + returns(bytes4); + + /** + @dev Handles the receipt of a multiple ERC1155 token types. This function + is called at the end of a `safeBatchTransferFrom` after the balances have + been updated. To accept the transfer(s), this must return + `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` + (i.e. 0xbc197c81, or its own function selector). + @param operator The address which initiated the batch transfer (i.e. msg.sender) + @param from The address which previously owned the token + @param ids An array containing ids of each token being transferred (order and length must match values array) + @param values An array containing amounts of each token being transferred (order and length must match ids array) + @param data Additional data with no specified format + @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed + */ + function onERC1155BatchReceived( + address operator, + address from, + uint256[] calldata ids, + uint256[] calldata values, + bytes calldata data + ) + external + returns(bytes4); +} + +// File: @openzeppelin/contracts/GSN/Context.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/* + * @dev Provides information about the current execution context, including the + * sender of the transaction and its data. While these are generally available + * via msg.sender and msg.data, they should not be accessed in such a direct + * manner, since when dealing with GSN meta-transactions the account sending and + * paying for execution may not be the actual sender (as far as an application + * is concerned). + * + * This contract is only required for intermediate, library-like contracts. + */ +abstract contract Context { + function _msgSender() internal view virtual returns (address payable) { + return msg.sender; + } + + function _msgData() internal view virtual returns (bytes memory) { + this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 + return msg.data; + } +} + +// File: @openzeppelin/contracts/introspection/ERC165.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + +/** + * @dev Implementation of the {IERC165} interface. + * + * Contracts may inherit from this and call {_registerInterface} to declare + * their support of an interface. + */ +contract ERC165 is IERC165 { + /* + * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 + */ + bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; + + /** + * @dev Mapping of interface ids to whether or not it's supported. + */ + mapping(bytes4 => bool) private _supportedInterfaces; + + constructor () internal { + // Derived contracts need only register support for their own interfaces, + // we register support for ERC165 itself here + _registerInterface(_INTERFACE_ID_ERC165); + } + + /** + * @dev See {IERC165-supportsInterface}. + * + * Time complexity O(1), guaranteed to always use less than 30 000 gas. + */ + function supportsInterface(bytes4 interfaceId) public view override returns (bool) { + return _supportedInterfaces[interfaceId]; + } + + /** + * @dev Registers the contract as an implementer of the interface defined by + * `interfaceId`. Support of the actual ERC165 interface is automatic and + * registering its interface id is not required. + * + * See {IERC165-supportsInterface}. + * + * Requirements: + * + * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`). + */ + function _registerInterface(bytes4 interfaceId) internal virtual { + require(interfaceId != 0xffffffff, "ERC165: invalid interface id"); + _supportedInterfaces[interfaceId] = true; + } +} + +// File: @openzeppelin/contracts/math/SafeMath.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Wrappers over Solidity's arithmetic operations with added overflow + * checks. + * + * Arithmetic operations in Solidity wrap on overflow. This can easily result + * in bugs, because programmers usually assume that an overflow raises an + * error, which is the standard behavior in high level programming languages. + * `SafeMath` restores this intuition by reverting the transaction when an + * operation overflows. + * + * Using this library instead of the unchecked operations eliminates an entire + * class of bugs, so it's recommended to use it always. + */ +library SafeMath { + /** + * @dev Returns the addition of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `+` operator. + * + * Requirements: + * + * - Addition cannot overflow. + */ + function add(uint256 a, uint256 b) internal pure returns (uint256) { + uint256 c = a + b; + require(c >= a, "SafeMath: addition overflow"); + + return c; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b) internal pure returns (uint256) { + return sub(a, b, "SafeMath: subtraction overflow"); + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting with custom message on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b <= a, errorMessage); + uint256 c = a - b; + + return c; + } + + /** + * @dev Returns the multiplication of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `*` operator. + * + * Requirements: + * + * - Multiplication cannot overflow. + */ + function mul(uint256 a, uint256 b) internal pure returns (uint256) { + // Gas optimization: this is cheaper than requiring 'a' not being zero, but the + // benefit is lost if 'b' is also tested. + // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 + if (a == 0) { + return 0; + } + + uint256 c = a * b; + require(c / a == b, "SafeMath: multiplication overflow"); + + return c; + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b) internal pure returns (uint256) { + return div(a, b, "SafeMath: division by zero"); + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts with custom message on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b > 0, errorMessage); + uint256 c = a / b; + // assert(a == b * c + a % b); // There is no case in which this doesn't hold + + return c; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b) internal pure returns (uint256) { + return mod(a, b, "SafeMath: modulo by zero"); + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts with custom message when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b != 0, errorMessage); + return a % b; + } +} + +// File: @openzeppelin/contracts/utils/Address.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + +/** + * @dev Collection of functions related to the address type + */ +library Address { + /** + * @dev Returns true if `account` is a contract. + * + * [IMPORTANT] + * ==== + * It is unsafe to assume that an address for which this function returns + * false is an externally-owned account (EOA) and not a contract. + * + * Among others, `isContract` will return false for the following + * types of addresses: + * + * - an externally-owned account + * - a contract in construction + * - an address where a contract will be created + * - an address where a contract lived, but was destroyed + * ==== + */ + function isContract(address account) internal view returns (bool) { + // According to EIP-1052, 0x0 is the value returned for not-yet created accounts + // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned + // for accounts without code, i.e. `keccak256('')` + bytes32 codehash; + bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; + // solhint-disable-next-line no-inline-assembly + assembly { codehash := extcodehash(account) } + return (codehash != accountHash && codehash != 0x0); + } + + /** + * @dev Replacement for Solidity's `transfer`: sends `amount` wei to + * `recipient`, forwarding all available gas and reverting on errors. + * + * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost + * of certain opcodes, possibly making contracts go over the 2300 gas limit + * imposed by `transfer`, making them unable to receive funds via + * `transfer`. {sendValue} removes this limitation. + * + * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. + * + * IMPORTANT: because control is transferred to `recipient`, care must be + * taken to not create reentrancy vulnerabilities. Consider using + * {ReentrancyGuard} or the + * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. + */ + function sendValue(address payable recipient, uint256 amount) internal { + require(address(this).balance >= amount, "Address: insufficient balance"); + + // solhint-disable-next-line avoid-low-level-calls, avoid-call-value + (bool success, ) = recipient.call{ value: amount }(""); + require(success, "Address: unable to send value, recipient may have reverted"); + } + + /** + * @dev Performs a Solidity function call using a low level `call`. A + * plain`call` is an unsafe replacement for a function call: use this + * function instead. + * + * If `target` reverts with a revert reason, it is bubbled up by this + * function (like regular Solidity function calls). + * + * Returns the raw returned data. To convert to the expected return value, + * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. + * + * Requirements: + * + * - `target` must be a contract. + * - calling `target` with `data` must not revert. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data) internal returns (bytes memory) { + return functionCall(target, data, "Address: low-level call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with + * `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { + return _functionCallWithValue(target, data, 0, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but also transferring `value` wei to `target`. + * + * Requirements: + * + * - the calling contract must have an ETH balance of at least `value`. + * - the called Solidity function must be `payable`. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { + return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); + } + + /** + * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but + * with `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { + require(address(this).balance >= value, "Address: insufficient balance for call"); + return _functionCallWithValue(target, data, value, errorMessage); + } + + function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { + require(isContract(target), "Address: call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); + if (success) { + return returndata; + } else { + // Look for revert reason and bubble it up if present + if (returndata.length > 0) { + // The easiest way to bubble the revert reason is using memory via assembly + + // solhint-disable-next-line no-inline-assembly + assembly { + let returndata_size := mload(returndata) + revert(add(32, returndata), returndata_size) + } + } else { + revert(errorMessage); + } + } + } +} + +// File: @openzeppelin/contracts/token/ERC1155/ERC1155.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + + + + + +/** + * + * @dev Implementation of the basic standard multi-token. + * See https://eips.ethereum.org/EIPS/eip-1155 + * Originally based on code by Enjin: https://github.com/enjin/erc-1155 + * + * _Available since v3.1._ + */ +contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI { + using SafeMath for uint256; + using Address for address; + + // Mapping from token ID to account balances + mapping (uint256 => mapping(address => uint256)) private _balances; + + // Mapping from account to operator approvals + mapping (address => mapping(address => bool)) private _operatorApprovals; + + // Used as the URI for all token types by relying on ID substition, e.g. https://token-cdn-domain/{id}.json + string private _uri; + + /* + * bytes4(keccak256('balanceOf(address,uint256)')) == 0x00fdd58e + * bytes4(keccak256('balanceOfBatch(address[],uint256[])')) == 0x4e1273f4 + * bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465 + * bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5 + * bytes4(keccak256('safeTransferFrom(address,address,uint256,uint256,bytes)')) == 0xf242432a + * bytes4(keccak256('safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)')) == 0x2eb2c2d6 + * + * => 0x00fdd58e ^ 0x4e1273f4 ^ 0xa22cb465 ^ + * 0xe985e9c5 ^ 0xf242432a ^ 0x2eb2c2d6 == 0xd9b67a26 + */ + bytes4 private constant _INTERFACE_ID_ERC1155 = 0xd9b67a26; + + /* + * bytes4(keccak256('uri(uint256)')) == 0x0e89341c + */ + bytes4 private constant _INTERFACE_ID_ERC1155_METADATA_URI = 0x0e89341c; + + /** + * @dev See {_setURI}. + */ + constructor (string memory uri) public { + _setURI(uri); + + // register the supported interfaces to conform to ERC1155 via ERC165 + _registerInterface(_INTERFACE_ID_ERC1155); + + // register the supported interfaces to conform to ERC1155MetadataURI via ERC165 + _registerInterface(_INTERFACE_ID_ERC1155_METADATA_URI); + } + + /** + * @dev See {IERC1155MetadataURI-uri}. + * + * This implementation returns the same URI for *all* token types. It relies + * on the token type ID substituion mechanism + * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP]. + * + * Clients calling this function must replace the `\{id\}` substring with the + * actual token type ID. + */ + function uri(uint256) external view override returns (string memory) { + return _uri; + } + + /** + * @dev See {IERC1155-balanceOf}. + * + * Requirements: + * + * - `account` cannot be the zero address. + */ + function balanceOf(address account, uint256 id) public view override returns (uint256) { + require(account != address(0), "ERC1155: balance query for the zero address"); + return _balances[id][account]; + } + + /** + * @dev See {IERC1155-balanceOfBatch}. + * + * Requirements: + * + * - `accounts` and `ids` must have the same length. + */ + function balanceOfBatch( + address[] memory accounts, + uint256[] memory ids + ) + public + view + override + returns (uint256[] memory) + { + require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch"); + + uint256[] memory batchBalances = new uint256[](accounts.length); + + for (uint256 i = 0; i < accounts.length; ++i) { + require(accounts[i] != address(0), "ERC1155: batch balance query for the zero address"); + batchBalances[i] = _balances[ids[i]][accounts[i]]; + } + + return batchBalances; + } + + /** + * @dev See {IERC1155-setApprovalForAll}. + */ + function setApprovalForAll(address operator, bool approved) public virtual override { + require(_msgSender() != operator, "ERC1155: setting approval status for self"); + + _operatorApprovals[_msgSender()][operator] = approved; + emit ApprovalForAll(_msgSender(), operator, approved); + } + + /** + * @dev See {IERC1155-isApprovedForAll}. + */ + function isApprovedForAll(address account, address operator) public view override returns (bool) { + return _operatorApprovals[account][operator]; + } + + /** + * @dev See {IERC1155-safeTransferFrom}. + */ + function safeTransferFrom( + address from, + address to, + uint256 id, + uint256 amount, + bytes memory data + ) + public + virtual + override + { + require(to != address(0), "ERC1155: transfer to the zero address"); + require( + from == _msgSender() || isApprovedForAll(from, _msgSender()), + "ERC1155: caller is not owner nor approved" + ); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, from, to, _asSingletonArray(id), _asSingletonArray(amount), data); + + _balances[id][from] = _balances[id][from].sub(amount, "ERC1155: insufficient balance for transfer"); + _balances[id][to] = _balances[id][to].add(amount); + + emit TransferSingle(operator, from, to, id, amount); + + _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data); + } + + /** + * @dev See {IERC1155-safeBatchTransferFrom}. + */ + function safeBatchTransferFrom( + address from, + address to, + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) + public + virtual + override + { + require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); + require(to != address(0), "ERC1155: transfer to the zero address"); + require( + from == _msgSender() || isApprovedForAll(from, _msgSender()), + "ERC1155: transfer caller is not owner nor approved" + ); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, from, to, ids, amounts, data); + + for (uint256 i = 0; i < ids.length; ++i) { + uint256 id = ids[i]; + uint256 amount = amounts[i]; + + _balances[id][from] = _balances[id][from].sub( + amount, + "ERC1155: insufficient balance for transfer" + ); + _balances[id][to] = _balances[id][to].add(amount); + } + + emit TransferBatch(operator, from, to, ids, amounts); + + _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data); + } + + /** + * @dev Sets a new URI for all token types, by relying on the token type ID + * substituion mechanism + * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP]. + * + * By this mechanism, any occurence of the `\{id\}` substring in either the + * URI or any of the amounts in the JSON file at said URI will be replaced by + * clients with the token type ID. + * + * For example, the `https://token-cdn-domain/\{id\}.json` URI would be + * interpreted by clients as + * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json` + * for token type ID 0x4cce0. + * + * See {uri}. + * + * Because these URIs cannot be meaningfully represented by the {URI} event, + * this function emits no events. + */ + function _setURI(string memory newuri) internal virtual { + _uri = newuri; + } + + /** + * @dev Creates `amount` tokens of token type `id`, and assigns them to `account`. + * + * Emits a {TransferSingle} event. + * + * Requirements: + * + * - `account` cannot be the zero address. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the + * acceptance magic value. + */ + function _mint(address account, uint256 id, uint256 amount, bytes memory data) internal virtual { + require(account != address(0), "ERC1155: mint to the zero address"); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, address(0), account, _asSingletonArray(id), _asSingletonArray(amount), data); + + _balances[id][account] = _balances[id][account].add(amount); + emit TransferSingle(operator, address(0), account, id, amount); + + _doSafeTransferAcceptanceCheck(operator, address(0), account, id, amount, data); + } + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}. + * + * Requirements: + * + * - `ids` and `amounts` must have the same length. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the + * acceptance magic value. + */ + function _mintBatch(address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data) internal virtual { + require(to != address(0), "ERC1155: mint to the zero address"); + require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, address(0), to, ids, amounts, data); + + for (uint i = 0; i < ids.length; i++) { + _balances[ids[i]][to] = amounts[i].add(_balances[ids[i]][to]); + } + + emit TransferBatch(operator, address(0), to, ids, amounts); + + _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data); + } + + /** + * @dev Destroys `amount` tokens of token type `id` from `account` + * + * Requirements: + * + * - `account` cannot be the zero address. + * - `account` must have at least `amount` tokens of token type `id`. + */ + function _burn(address account, uint256 id, uint256 amount) internal virtual { + require(account != address(0), "ERC1155: burn from the zero address"); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, account, address(0), _asSingletonArray(id), _asSingletonArray(amount), ""); + + _balances[id][account] = _balances[id][account].sub( + amount, + "ERC1155: burn amount exceeds balance" + ); + + emit TransferSingle(operator, account, address(0), id, amount); + } + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}. + * + * Requirements: + * + * - `ids` and `amounts` must have the same length. + */ + function _burnBatch(address account, uint256[] memory ids, uint256[] memory amounts) internal virtual { + require(account != address(0), "ERC1155: burn from the zero address"); + require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, account, address(0), ids, amounts, ""); + + for (uint i = 0; i < ids.length; i++) { + _balances[ids[i]][account] = _balances[ids[i]][account].sub( + amounts[i], + "ERC1155: burn amount exceeds balance" + ); + } + + emit TransferBatch(operator, account, address(0), ids, amounts); + } + + /** + * @dev Hook that is called before any token transfer. This includes minting + * and burning, as well as batched variants. + * + * The same hook is called on both single and batched variants. For single + * transfers, the length of the `id` and `amount` arrays will be 1. + * + * Calling conditions (for each `id` and `amount` pair): + * + * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens + * of token type `id` will be transferred to `to`. + * - When `from` is zero, `amount` tokens of token type `id` will be minted + * for `to`. + * - when `to` is zero, `amount` of ``from``'s tokens of token type `id` + * will be burned. + * - `from` and `to` are never both zero. + * - `ids` and `amounts` have the same, non-zero length. + * + * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. + */ + function _beforeTokenTransfer( + address operator, + address from, + address to, + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) + internal virtual + { } + + function _doSafeTransferAcceptanceCheck( + address operator, + address from, + address to, + uint256 id, + uint256 amount, + bytes memory data + ) + private + { + if (to.isContract()) { + try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) { + if (response != IERC1155Receiver(to).onERC1155Received.selector) { + revert("ERC1155: ERC1155Receiver rejected tokens"); + } + } catch Error(string memory reason) { + revert(reason); + } catch { + revert("ERC1155: transfer to non ERC1155Receiver implementer"); + } + } + } + + function _doSafeBatchTransferAcceptanceCheck( + address operator, + address from, + address to, + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) + private + { + if (to.isContract()) { + try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (bytes4 response) { + if (response != IERC1155Receiver(to).onERC1155BatchReceived.selector) { + revert("ERC1155: ERC1155Receiver rejected tokens"); + } + } catch Error(string memory reason) { + revert(reason); + } catch { + revert("ERC1155: transfer to non ERC1155Receiver implementer"); + } + } + } + + function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) { + uint256[] memory array = new uint256[](1); + array[0] = element; + + return array; + } +} + +// File: @openzeppelin/contracts/utils/EnumerableSet.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Library for managing + * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive + * types. + * + * Sets have the following properties: + * + * - Elements are added, removed, and checked for existence in constant time + * (O(1)). + * - Elements are enumerated in O(n). No guarantees are made on the ordering. + * + * ``` + * contract Example { + * // Add the library methods + * using EnumerableSet for EnumerableSet.AddressSet; + * + * // Declare a set state variable + * EnumerableSet.AddressSet private mySet; + * } + * ``` + * + * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256` + * (`UintSet`) are supported. + */ +library EnumerableSet { + // To implement this library for multiple types with as little code + // repetition as possible, we write it in terms of a generic Set type with + // bytes32 values. + // The Set implementation uses private functions, and user-facing + // implementations (such as AddressSet) are just wrappers around the + // underlying Set. + // This means that we can only create new EnumerableSets for types that fit + // in bytes32. + + struct Set { + // Storage of set values + bytes32[] _values; + + // Position of the value in the `values` array, plus 1 because index 0 + // means a value is not in the set. + mapping (bytes32 => uint256) _indexes; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function _add(Set storage set, bytes32 value) private returns (bool) { + if (!_contains(set, value)) { + set._values.push(value); + // The value is stored at length-1, but we add 1 to all indexes + // and use 0 as a sentinel value + set._indexes[value] = set._values.length; + return true; + } else { + return false; + } + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function _remove(Set storage set, bytes32 value) private returns (bool) { + // We read and store the value's index to prevent multiple reads from the same storage slot + uint256 valueIndex = set._indexes[value]; + + if (valueIndex != 0) { // Equivalent to contains(set, value) + // To delete an element from the _values array in O(1), we swap the element to delete with the last one in + // the array, and then remove the last element (sometimes called as 'swap and pop'). + // This modifies the order of the array, as noted in {at}. + + uint256 toDeleteIndex = valueIndex - 1; + uint256 lastIndex = set._values.length - 1; + + // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs + // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. + + bytes32 lastvalue = set._values[lastIndex]; + + // Move the last value to the index where the value to delete is + set._values[toDeleteIndex] = lastvalue; + // Update the index for the moved value + set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based + + // Delete the slot where the moved value was stored + set._values.pop(); + + // Delete the index for the deleted slot + delete set._indexes[value]; + + return true; + } else { + return false; + } + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function _contains(Set storage set, bytes32 value) private view returns (bool) { + return set._indexes[value] != 0; + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function _length(Set storage set) private view returns (uint256) { + return set._values.length; + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function _at(Set storage set, uint256 index) private view returns (bytes32) { + require(set._values.length > index, "EnumerableSet: index out of bounds"); + return set._values[index]; + } + + // AddressSet + + struct AddressSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(AddressSet storage set, address value) internal returns (bool) { + return _add(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(AddressSet storage set, address value) internal returns (bool) { + return _remove(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(AddressSet storage set, address value) internal view returns (bool) { + return _contains(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns the number of values in the set. O(1). + */ + function length(AddressSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(AddressSet storage set, uint256 index) internal view returns (address) { + return address(uint256(_at(set._inner, index))); + } + + + // UintSet + + struct UintSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(UintSet storage set, uint256 value) internal returns (bool) { + return _add(set._inner, bytes32(value)); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(UintSet storage set, uint256 value) internal returns (bool) { + return _remove(set._inner, bytes32(value)); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(UintSet storage set, uint256 value) internal view returns (bool) { + return _contains(set._inner, bytes32(value)); + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function length(UintSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(UintSet storage set, uint256 index) internal view returns (uint256) { + return uint256(_at(set._inner, index)); + } +} + +// File: @openzeppelin/contracts/access/AccessControl.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + +/** + * @dev Contract module that allows children to implement role-based access + * control mechanisms. + * + * Roles are referred to by their `bytes32` identifier. These should be exposed + * in the external API and be unique. The best way to achieve this is by + * using `public constant` hash digests: + * + * ``` + * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); + * ``` + * + * Roles can be used to represent a set of permissions. To restrict access to a + * function call, use {hasRole}: + * + * ``` + * function foo() public { + * require(hasRole(MY_ROLE, msg.sender)); + * ... + * } + * ``` + * + * Roles can be granted and revoked dynamically via the {grantRole} and + * {revokeRole} functions. Each role has an associated admin role, and only + * accounts that have a role's admin role can call {grantRole} and {revokeRole}. + * + * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means + * that only accounts with this role will be able to grant or revoke other + * roles. More complex role relationships can be created by using + * {_setRoleAdmin}. + * + * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to + * grant and revoke this role. Extra precautions should be taken to secure + * accounts that have been granted it. + */ +abstract contract AccessControl is Context { + using EnumerableSet for EnumerableSet.AddressSet; + using Address for address; + + struct RoleData { + EnumerableSet.AddressSet members; + bytes32 adminRole; + } + + mapping (bytes32 => RoleData) private _roles; + + bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; + + /** + * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` + * + * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite + * {RoleAdminChanged} not being emitted signaling this. + * + * _Available since v3.1._ + */ + event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); + + /** + * @dev Emitted when `account` is granted `role`. + * + * `sender` is the account that originated the contract call, an admin role + * bearer except when using {_setupRole}. + */ + event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Emitted when `account` is revoked `role`. + * + * `sender` is the account that originated the contract call: + * - if using `revokeRole`, it is the admin role bearer + * - if using `renounceRole`, it is the role bearer (i.e. `account`) + */ + event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Returns `true` if `account` has been granted `role`. + */ + function hasRole(bytes32 role, address account) public view returns (bool) { + return _roles[role].members.contains(account); + } + + /** + * @dev Returns the number of accounts that have `role`. Can be used + * together with {getRoleMember} to enumerate all bearers of a role. + */ + function getRoleMemberCount(bytes32 role) public view returns (uint256) { + return _roles[role].members.length(); + } + + /** + * @dev Returns one of the accounts that have `role`. `index` must be a + * value between 0 and {getRoleMemberCount}, non-inclusive. + * + * Role bearers are not sorted in any particular way, and their ordering may + * change at any point. + * + * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure + * you perform all queries on the same block. See the following + * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] + * for more information. + */ + function getRoleMember(bytes32 role, uint256 index) public view returns (address) { + return _roles[role].members.at(index); + } + + /** + * @dev Returns the admin role that controls `role`. See {grantRole} and + * {revokeRole}. + * + * To change a role's admin, use {_setRoleAdmin}. + */ + function getRoleAdmin(bytes32 role) public view returns (bytes32) { + return _roles[role].adminRole; + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function grantRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); + + _grantRole(role, account); + } + + /** + * @dev Revokes `role` from `account`. + * + * If `account` had been granted `role`, emits a {RoleRevoked} event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function revokeRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); + + _revokeRole(role, account); + } + + /** + * @dev Revokes `role` from the calling account. + * + * Roles are often managed via {grantRole} and {revokeRole}: this function's + * purpose is to provide a mechanism for accounts to lose their privileges + * if they are compromised (such as when a trusted device is misplaced). + * + * If the calling account had been granted `role`, emits a {RoleRevoked} + * event. + * + * Requirements: + * + * - the caller must be `account`. + */ + function renounceRole(bytes32 role, address account) public virtual { + require(account == _msgSender(), "AccessControl: can only renounce roles for self"); + + _revokeRole(role, account); + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. Note that unlike {grantRole}, this function doesn't perform any + * checks on the calling account. + * + * [WARNING] + * ==== + * This function should only be called from the constructor when setting + * up the initial roles for the system. + * + * Using this function in any other way is effectively circumventing the admin + * system imposed by {AccessControl}. + * ==== + */ + function _setupRole(bytes32 role, address account) internal virtual { + _grantRole(role, account); + } + + /** + * @dev Sets `adminRole` as ``role``'s admin role. + * + * Emits a {RoleAdminChanged} event. + */ + function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { + emit RoleAdminChanged(role, _roles[role].adminRole, adminRole); + _roles[role].adminRole = adminRole; + } + + function _grantRole(bytes32 role, address account) private { + if (_roles[role].members.add(account)) { + emit RoleGranted(role, account, _msgSender()); + } + } + + function _revokeRole(bytes32 role, address account) private { + if (_roles[role].members.remove(account)) { + emit RoleRevoked(role, account, _msgSender()); + } + } +} + +// File: contracts/common/AccessControlMixin.sol + +pragma solidity 0.6.6; + + +contract AccessControlMixin is AccessControl { + string private _revertMsg; + function _setupContractId(string memory contractId) internal { + _revertMsg = string(abi.encodePacked(contractId, ": INSUFFICIENT_PERMISSIONS")); + } + + modifier only(bytes32 role) { + require( + hasRole(role, _msgSender()), + _revertMsg + ); + _; + } +} + +// File: contracts/child/ChildToken/IChildToken.sol + +pragma solidity 0.6.6; + +interface IChildToken { + function deposit(address user, bytes calldata depositData) external; +} + +// File: contracts/common/Initializable.sol + +pragma solidity 0.6.6; + +contract Initializable { + bool inited = false; + + modifier initializer() { + require(!inited, "already inited"); + _; + inited = true; + } +} + +// File: contracts/common/EIP712Base.sol + +pragma solidity 0.6.6; + + +contract EIP712Base is Initializable { + struct EIP712Domain { + string name; + string version; + address verifyingContract; + bytes32 salt; + } + + string constant public ERC712_VERSION = "1"; + + bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256( + bytes( + "EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)" + ) + ); + bytes32 internal domainSeperator; + + // supposed to be called once while initializing. + // one of the contractsa that inherits this contract follows proxy pattern + // so it is not possible to do this in a constructor + function _initializeEIP712( + string memory name + ) + internal + initializer + { + _setDomainSeperator(name); + } + + function _setDomainSeperator(string memory name) internal { + domainSeperator = keccak256( + abi.encode( + EIP712_DOMAIN_TYPEHASH, + keccak256(bytes(name)), + keccak256(bytes(ERC712_VERSION)), + address(this), + bytes32(getChainId()) + ) + ); + } + + function getDomainSeperator() public view returns (bytes32) { + return domainSeperator; + } + + function getChainId() public pure returns (uint256) { + uint256 id; + assembly { + id := chainid() + } + return id; + } + + /** + * Accept message hash and returns hash message in EIP712 compatible form + * So that it can be used to recover signer from signature signed using EIP712 formatted data + * https://eips.ethereum.org/EIPS/eip-712 + * "\\x19" makes the encoding deterministic + * "\\x01" is the version byte to make it compatible to EIP-191 + */ + function toTypedMessageHash(bytes32 messageHash) + internal + view + returns (bytes32) + { + return + keccak256( + abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash) + ); + } +} + +// File: contracts/common/NativeMetaTransaction.sol + +pragma solidity 0.6.6; + + + +contract NativeMetaTransaction is EIP712Base { + using SafeMath for uint256; + bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256( + bytes( + "MetaTransaction(uint256 nonce,address from,bytes functionSignature)" + ) + ); + event MetaTransactionExecuted( + address userAddress, + address payable relayerAddress, + bytes functionSignature + ); + mapping(address => uint256) nonces; + + /* + * Meta transaction structure. + * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas + * He should call the desired function directly in that case. + */ + struct MetaTransaction { + uint256 nonce; + address from; + bytes functionSignature; + } + + function executeMetaTransaction( + address userAddress, + bytes memory functionSignature, + bytes32 sigR, + bytes32 sigS, + uint8 sigV + ) public payable returns (bytes memory) { + MetaTransaction memory metaTx = MetaTransaction({ + nonce: nonces[userAddress], + from: userAddress, + functionSignature: functionSignature + }); + + require( + verify(userAddress, metaTx, sigR, sigS, sigV), + "Signer and signature do not match" + ); + + // increase nonce for user (to avoid re-use) + nonces[userAddress] = nonces[userAddress].add(1); + + emit MetaTransactionExecuted( + userAddress, + msg.sender, + functionSignature + ); + + // Append userAddress and relayer address at the end to extract it from calling context + (bool success, bytes memory returnData) = address(this).call( + abi.encodePacked(functionSignature, userAddress) + ); + require(success, "Function call not successful"); + + return returnData; + } + + function hashMetaTransaction(MetaTransaction memory metaTx) + internal + pure + returns (bytes32) + { + return + keccak256( + abi.encode( + META_TRANSACTION_TYPEHASH, + metaTx.nonce, + metaTx.from, + keccak256(metaTx.functionSignature) + ) + ); + } + + function getNonce(address user) public view returns (uint256 nonce) { + nonce = nonces[user]; + } + + function verify( + address signer, + MetaTransaction memory metaTx, + bytes32 sigR, + bytes32 sigS, + uint8 sigV + ) internal view returns (bool) { + require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER"); + return + signer == + ecrecover( + toTypedMessageHash(hashMetaTransaction(metaTx)), + sigV, + sigR, + sigS + ); + } +} + +// File: contracts/common/ContextMixin.sol + +pragma solidity 0.6.6; + +abstract contract ContextMixin { + function msgSender() + internal + view + returns (address payable sender) + { + if (msg.sender == address(this)) { + bytes memory array = msg.data; + uint256 index = msg.data.length; + assembly { + // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those. + sender := and( + mload(add(array, index)), + 0xffffffffffffffffffffffffffffffffffffffff + ) + } + } else { + sender = msg.sender; + } + return sender; + } +} + +// File: contracts/child/ChildToken/ChildMintableERC1155.sol + +pragma solidity 0.6.6; + + + + + + +contract ChildMintableERC1155 is + ERC1155, + IChildToken, + AccessControlMixin, + NativeMetaTransaction, + ContextMixin +{ + bytes32 public constant DEPOSITOR_ROLE = keccak256("DEPOSITOR_ROLE"); + + constructor(string memory uri_, address childChainManager) + public + ERC1155(uri_) + { + _setupContractId("ChildMintableERC1155"); + _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); + _setupRole(DEPOSITOR_ROLE, childChainManager); + _initializeEIP712(uri_); + } + + // This is to support Native meta transactions + // never use msg.sender directly, use _msgSender() instead + function _msgSender() + internal + override + view + returns (address payable sender) + { + return ContextMixin.msgSender(); + } + + /** + * @notice called when tokens are deposited on root chain + * @dev Should be callable only by ChildChainManager + * Should handle deposit by minting the required tokens for user + * Make sure minting is done only by this function + * @param user user address for whom deposit is being done + * @param depositData abi encoded ids array and amounts array + */ + function deposit(address user, bytes calldata depositData) + external + override + only(DEPOSITOR_ROLE) + { + ( + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) = abi.decode(depositData, (uint256[], uint256[], bytes)); + + require( + user != address(0), + "ChildMintableERC1155: INVALID_DEPOSIT_USER" + ); + + _mintBatch(user, ids, amounts, data); + } + + /** + * @notice called when user wants to withdraw single token back to root chain + * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain + * @param id id to withdraw + * @param amount amount to withdraw + */ + function withdrawSingle(uint256 id, uint256 amount) external { + _burn(_msgSender(), id, amount); + } + + /** + * @notice called when user wants to batch withdraw tokens back to root chain + * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain + * @param ids ids to withdraw + * @param amounts amounts to withdraw + */ + function withdrawBatch(uint256[] calldata ids, uint256[] calldata amounts) + external + { + _burnBatch(_msgSender(), ids, amounts); + } + + /** + * @notice See definition of `_mint` in ERC1155 contract + * @dev This implementation only allows admins to mint tokens + * but can be changed as per requirement + */ + function mint( + address account, + uint256 id, + uint256 amount, + bytes calldata data + ) external only(DEFAULT_ADMIN_ROLE) { + _mint(account, id, amount, data); + } + + /** + * @notice See definition of `_mintBatch` in ERC1155 contract + * @dev This implementation only allows admins to mint tokens + * but can be changed as per requirement + */ + function mintBatch( + address to, + uint256[] calldata ids, + uint256[] calldata amounts, + bytes calldata data + ) external only(DEFAULT_ADMIN_ROLE) { + _mintBatch(to, ids, amounts, data); + } +} diff --git a/flat/ChildMintableERC20.sol b/flat/ChildMintableERC20.sol new file mode 100644 index 00000000..e92a4055 --- /dev/null +++ b/flat/ChildMintableERC20.sol @@ -0,0 +1,1520 @@ + +// File: @openzeppelin/contracts/GSN/Context.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/* + * @dev Provides information about the current execution context, including the + * sender of the transaction and its data. While these are generally available + * via msg.sender and msg.data, they should not be accessed in such a direct + * manner, since when dealing with GSN meta-transactions the account sending and + * paying for execution may not be the actual sender (as far as an application + * is concerned). + * + * This contract is only required for intermediate, library-like contracts. + */ +abstract contract Context { + function _msgSender() internal view virtual returns (address payable) { + return msg.sender; + } + + function _msgData() internal view virtual returns (bytes memory) { + this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 + return msg.data; + } +} + +// File: @openzeppelin/contracts/token/ERC20/IERC20.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Interface of the ERC20 standard as defined in the EIP. + */ +interface IERC20 { + /** + * @dev Returns the amount of tokens in existence. + */ + function totalSupply() external view returns (uint256); + + /** + * @dev Returns the amount of tokens owned by `account`. + */ + function balanceOf(address account) external view returns (uint256); + + /** + * @dev Moves `amount` tokens from the caller's account to `recipient`. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transfer(address recipient, uint256 amount) external returns (bool); + + /** + * @dev Returns the remaining number of tokens that `spender` will be + * allowed to spend on behalf of `owner` through {transferFrom}. This is + * zero by default. + * + * This value changes when {approve} or {transferFrom} are called. + */ + function allowance(address owner, address spender) external view returns (uint256); + + /** + * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * IMPORTANT: Beware that changing an allowance with this method brings the risk + * that someone may use both the old and the new allowance by unfortunate + * transaction ordering. One possible solution to mitigate this race + * condition is to first reduce the spender's allowance to 0 and set the + * desired value afterwards: + * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 + * + * Emits an {Approval} event. + */ + function approve(address spender, uint256 amount) external returns (bool); + + /** + * @dev Moves `amount` tokens from `sender` to `recipient` using the + * allowance mechanism. `amount` is then deducted from the caller's + * allowance. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); + + /** + * @dev Emitted when `value` tokens are moved from one account (`from`) to + * another (`to`). + * + * Note that `value` may be zero. + */ + event Transfer(address indexed from, address indexed to, uint256 value); + + /** + * @dev Emitted when the allowance of a `spender` for an `owner` is set by + * a call to {approve}. `value` is the new allowance. + */ + event Approval(address indexed owner, address indexed spender, uint256 value); +} + +// File: @openzeppelin/contracts/math/SafeMath.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Wrappers over Solidity's arithmetic operations with added overflow + * checks. + * + * Arithmetic operations in Solidity wrap on overflow. This can easily result + * in bugs, because programmers usually assume that an overflow raises an + * error, which is the standard behavior in high level programming languages. + * `SafeMath` restores this intuition by reverting the transaction when an + * operation overflows. + * + * Using this library instead of the unchecked operations eliminates an entire + * class of bugs, so it's recommended to use it always. + */ +library SafeMath { + /** + * @dev Returns the addition of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `+` operator. + * + * Requirements: + * + * - Addition cannot overflow. + */ + function add(uint256 a, uint256 b) internal pure returns (uint256) { + uint256 c = a + b; + require(c >= a, "SafeMath: addition overflow"); + + return c; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b) internal pure returns (uint256) { + return sub(a, b, "SafeMath: subtraction overflow"); + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting with custom message on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b <= a, errorMessage); + uint256 c = a - b; + + return c; + } + + /** + * @dev Returns the multiplication of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `*` operator. + * + * Requirements: + * + * - Multiplication cannot overflow. + */ + function mul(uint256 a, uint256 b) internal pure returns (uint256) { + // Gas optimization: this is cheaper than requiring 'a' not being zero, but the + // benefit is lost if 'b' is also tested. + // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 + if (a == 0) { + return 0; + } + + uint256 c = a * b; + require(c / a == b, "SafeMath: multiplication overflow"); + + return c; + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b) internal pure returns (uint256) { + return div(a, b, "SafeMath: division by zero"); + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts with custom message on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b > 0, errorMessage); + uint256 c = a / b; + // assert(a == b * c + a % b); // There is no case in which this doesn't hold + + return c; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b) internal pure returns (uint256) { + return mod(a, b, "SafeMath: modulo by zero"); + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts with custom message when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b != 0, errorMessage); + return a % b; + } +} + +// File: @openzeppelin/contracts/utils/Address.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + +/** + * @dev Collection of functions related to the address type + */ +library Address { + /** + * @dev Returns true if `account` is a contract. + * + * [IMPORTANT] + * ==== + * It is unsafe to assume that an address for which this function returns + * false is an externally-owned account (EOA) and not a contract. + * + * Among others, `isContract` will return false for the following + * types of addresses: + * + * - an externally-owned account + * - a contract in construction + * - an address where a contract will be created + * - an address where a contract lived, but was destroyed + * ==== + */ + function isContract(address account) internal view returns (bool) { + // According to EIP-1052, 0x0 is the value returned for not-yet created accounts + // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned + // for accounts without code, i.e. `keccak256('')` + bytes32 codehash; + bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; + // solhint-disable-next-line no-inline-assembly + assembly { codehash := extcodehash(account) } + return (codehash != accountHash && codehash != 0x0); + } + + /** + * @dev Replacement for Solidity's `transfer`: sends `amount` wei to + * `recipient`, forwarding all available gas and reverting on errors. + * + * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost + * of certain opcodes, possibly making contracts go over the 2300 gas limit + * imposed by `transfer`, making them unable to receive funds via + * `transfer`. {sendValue} removes this limitation. + * + * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. + * + * IMPORTANT: because control is transferred to `recipient`, care must be + * taken to not create reentrancy vulnerabilities. Consider using + * {ReentrancyGuard} or the + * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. + */ + function sendValue(address payable recipient, uint256 amount) internal { + require(address(this).balance >= amount, "Address: insufficient balance"); + + // solhint-disable-next-line avoid-low-level-calls, avoid-call-value + (bool success, ) = recipient.call{ value: amount }(""); + require(success, "Address: unable to send value, recipient may have reverted"); + } + + /** + * @dev Performs a Solidity function call using a low level `call`. A + * plain`call` is an unsafe replacement for a function call: use this + * function instead. + * + * If `target` reverts with a revert reason, it is bubbled up by this + * function (like regular Solidity function calls). + * + * Returns the raw returned data. To convert to the expected return value, + * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. + * + * Requirements: + * + * - `target` must be a contract. + * - calling `target` with `data` must not revert. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data) internal returns (bytes memory) { + return functionCall(target, data, "Address: low-level call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with + * `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { + return _functionCallWithValue(target, data, 0, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but also transferring `value` wei to `target`. + * + * Requirements: + * + * - the calling contract must have an ETH balance of at least `value`. + * - the called Solidity function must be `payable`. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { + return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); + } + + /** + * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but + * with `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { + require(address(this).balance >= value, "Address: insufficient balance for call"); + return _functionCallWithValue(target, data, value, errorMessage); + } + + function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { + require(isContract(target), "Address: call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); + if (success) { + return returndata; + } else { + // Look for revert reason and bubble it up if present + if (returndata.length > 0) { + // The easiest way to bubble the revert reason is using memory via assembly + + // solhint-disable-next-line no-inline-assembly + assembly { + let returndata_size := mload(returndata) + revert(add(32, returndata), returndata_size) + } + } else { + revert(errorMessage); + } + } + } +} + +// File: @openzeppelin/contracts/token/ERC20/ERC20.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + + +/** + * @dev Implementation of the {IERC20} interface. + * + * This implementation is agnostic to the way tokens are created. This means + * that a supply mechanism has to be added in a derived contract using {_mint}. + * For a generic mechanism see {ERC20PresetMinterPauser}. + * + * TIP: For a detailed writeup see our guide + * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How + * to implement supply mechanisms]. + * + * We have followed general OpenZeppelin guidelines: functions revert instead + * of returning `false` on failure. This behavior is nonetheless conventional + * and does not conflict with the expectations of ERC20 applications. + * + * Additionally, an {Approval} event is emitted on calls to {transferFrom}. + * This allows applications to reconstruct the allowance for all accounts just + * by listening to said events. Other implementations of the EIP may not emit + * these events, as it isn't required by the specification. + * + * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} + * functions have been added to mitigate the well-known issues around setting + * allowances. See {IERC20-approve}. + */ +contract ERC20 is Context, IERC20 { + using SafeMath for uint256; + using Address for address; + + mapping (address => uint256) private _balances; + + mapping (address => mapping (address => uint256)) private _allowances; + + uint256 private _totalSupply; + + string private _name; + string private _symbol; + uint8 private _decimals; + + /** + * @dev Sets the values for {name} and {symbol}, initializes {decimals} with + * a default value of 18. + * + * To select a different value for {decimals}, use {_setupDecimals}. + * + * All three of these values are immutable: they can only be set once during + * construction. + */ + constructor (string memory name, string memory symbol) public { + _name = name; + _symbol = symbol; + _decimals = 18; + } + + /** + * @dev Returns the name of the token. + */ + function name() public view returns (string memory) { + return _name; + } + + /** + * @dev Returns the symbol of the token, usually a shorter version of the + * name. + */ + function symbol() public view returns (string memory) { + return _symbol; + } + + /** + * @dev Returns the number of decimals used to get its user representation. + * For example, if `decimals` equals `2`, a balance of `505` tokens should + * be displayed to a user as `5,05` (`505 / 10 ** 2`). + * + * Tokens usually opt for a value of 18, imitating the relationship between + * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is + * called. + * + * NOTE: This information is only used for _display_ purposes: it in + * no way affects any of the arithmetic of the contract, including + * {IERC20-balanceOf} and {IERC20-transfer}. + */ + function decimals() public view returns (uint8) { + return _decimals; + } + + /** + * @dev See {IERC20-totalSupply}. + */ + function totalSupply() public view override returns (uint256) { + return _totalSupply; + } + + /** + * @dev See {IERC20-balanceOf}. + */ + function balanceOf(address account) public view override returns (uint256) { + return _balances[account]; + } + + /** + * @dev See {IERC20-transfer}. + * + * Requirements: + * + * - `recipient` cannot be the zero address. + * - the caller must have a balance of at least `amount`. + */ + function transfer(address recipient, uint256 amount) public virtual override returns (bool) { + _transfer(_msgSender(), recipient, amount); + return true; + } + + /** + * @dev See {IERC20-allowance}. + */ + function allowance(address owner, address spender) public view virtual override returns (uint256) { + return _allowances[owner][spender]; + } + + /** + * @dev See {IERC20-approve}. + * + * Requirements: + * + * - `spender` cannot be the zero address. + */ + function approve(address spender, uint256 amount) public virtual override returns (bool) { + _approve(_msgSender(), spender, amount); + return true; + } + + /** + * @dev See {IERC20-transferFrom}. + * + * Emits an {Approval} event indicating the updated allowance. This is not + * required by the EIP. See the note at the beginning of {ERC20}; + * + * Requirements: + * - `sender` and `recipient` cannot be the zero address. + * - `sender` must have a balance of at least `amount`. + * - the caller must have allowance for ``sender``'s tokens of at least + * `amount`. + */ + function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { + _transfer(sender, recipient, amount); + _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); + return true; + } + + /** + * @dev Atomically increases the allowance granted to `spender` by the caller. + * + * This is an alternative to {approve} that can be used as a mitigation for + * problems described in {IERC20-approve}. + * + * Emits an {Approval} event indicating the updated allowance. + * + * Requirements: + * + * - `spender` cannot be the zero address. + */ + function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { + _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); + return true; + } + + /** + * @dev Atomically decreases the allowance granted to `spender` by the caller. + * + * This is an alternative to {approve} that can be used as a mitigation for + * problems described in {IERC20-approve}. + * + * Emits an {Approval} event indicating the updated allowance. + * + * Requirements: + * + * - `spender` cannot be the zero address. + * - `spender` must have allowance for the caller of at least + * `subtractedValue`. + */ + function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { + _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); + return true; + } + + /** + * @dev Moves tokens `amount` from `sender` to `recipient`. + * + * This is internal function is equivalent to {transfer}, and can be used to + * e.g. implement automatic token fees, slashing mechanisms, etc. + * + * Emits a {Transfer} event. + * + * Requirements: + * + * - `sender` cannot be the zero address. + * - `recipient` cannot be the zero address. + * - `sender` must have a balance of at least `amount`. + */ + function _transfer(address sender, address recipient, uint256 amount) internal virtual { + require(sender != address(0), "ERC20: transfer from the zero address"); + require(recipient != address(0), "ERC20: transfer to the zero address"); + + _beforeTokenTransfer(sender, recipient, amount); + + _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); + _balances[recipient] = _balances[recipient].add(amount); + emit Transfer(sender, recipient, amount); + } + + /** @dev Creates `amount` tokens and assigns them to `account`, increasing + * the total supply. + * + * Emits a {Transfer} event with `from` set to the zero address. + * + * Requirements + * + * - `to` cannot be the zero address. + */ + function _mint(address account, uint256 amount) internal virtual { + require(account != address(0), "ERC20: mint to the zero address"); + + _beforeTokenTransfer(address(0), account, amount); + + _totalSupply = _totalSupply.add(amount); + _balances[account] = _balances[account].add(amount); + emit Transfer(address(0), account, amount); + } + + /** + * @dev Destroys `amount` tokens from `account`, reducing the + * total supply. + * + * Emits a {Transfer} event with `to` set to the zero address. + * + * Requirements + * + * - `account` cannot be the zero address. + * - `account` must have at least `amount` tokens. + */ + function _burn(address account, uint256 amount) internal virtual { + require(account != address(0), "ERC20: burn from the zero address"); + + _beforeTokenTransfer(account, address(0), amount); + + _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); + _totalSupply = _totalSupply.sub(amount); + emit Transfer(account, address(0), amount); + } + + /** + * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens. + * + * This is internal function is equivalent to `approve`, and can be used to + * e.g. set automatic allowances for certain subsystems, etc. + * + * Emits an {Approval} event. + * + * Requirements: + * + * - `owner` cannot be the zero address. + * - `spender` cannot be the zero address. + */ + function _approve(address owner, address spender, uint256 amount) internal virtual { + require(owner != address(0), "ERC20: approve from the zero address"); + require(spender != address(0), "ERC20: approve to the zero address"); + + _allowances[owner][spender] = amount; + emit Approval(owner, spender, amount); + } + + /** + * @dev Sets {decimals} to a value other than the default one of 18. + * + * WARNING: This function should only be called from the constructor. Most + * applications that interact with token contracts will not expect + * {decimals} to ever change, and may work incorrectly if it does. + */ + function _setupDecimals(uint8 decimals_) internal { + _decimals = decimals_; + } + + /** + * @dev Hook that is called before any transfer of tokens. This includes + * minting and burning. + * + * Calling conditions: + * + * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens + * will be to transferred to `to`. + * - when `from` is zero, `amount` tokens will be minted for `to`. + * - when `to` is zero, `amount` of ``from``'s tokens will be burned. + * - `from` and `to` are never both zero. + * + * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. + */ + function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } +} + +// File: @openzeppelin/contracts/utils/EnumerableSet.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Library for managing + * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive + * types. + * + * Sets have the following properties: + * + * - Elements are added, removed, and checked for existence in constant time + * (O(1)). + * - Elements are enumerated in O(n). No guarantees are made on the ordering. + * + * ``` + * contract Example { + * // Add the library methods + * using EnumerableSet for EnumerableSet.AddressSet; + * + * // Declare a set state variable + * EnumerableSet.AddressSet private mySet; + * } + * ``` + * + * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256` + * (`UintSet`) are supported. + */ +library EnumerableSet { + // To implement this library for multiple types with as little code + // repetition as possible, we write it in terms of a generic Set type with + // bytes32 values. + // The Set implementation uses private functions, and user-facing + // implementations (such as AddressSet) are just wrappers around the + // underlying Set. + // This means that we can only create new EnumerableSets for types that fit + // in bytes32. + + struct Set { + // Storage of set values + bytes32[] _values; + + // Position of the value in the `values` array, plus 1 because index 0 + // means a value is not in the set. + mapping (bytes32 => uint256) _indexes; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function _add(Set storage set, bytes32 value) private returns (bool) { + if (!_contains(set, value)) { + set._values.push(value); + // The value is stored at length-1, but we add 1 to all indexes + // and use 0 as a sentinel value + set._indexes[value] = set._values.length; + return true; + } else { + return false; + } + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function _remove(Set storage set, bytes32 value) private returns (bool) { + // We read and store the value's index to prevent multiple reads from the same storage slot + uint256 valueIndex = set._indexes[value]; + + if (valueIndex != 0) { // Equivalent to contains(set, value) + // To delete an element from the _values array in O(1), we swap the element to delete with the last one in + // the array, and then remove the last element (sometimes called as 'swap and pop'). + // This modifies the order of the array, as noted in {at}. + + uint256 toDeleteIndex = valueIndex - 1; + uint256 lastIndex = set._values.length - 1; + + // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs + // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. + + bytes32 lastvalue = set._values[lastIndex]; + + // Move the last value to the index where the value to delete is + set._values[toDeleteIndex] = lastvalue; + // Update the index for the moved value + set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based + + // Delete the slot where the moved value was stored + set._values.pop(); + + // Delete the index for the deleted slot + delete set._indexes[value]; + + return true; + } else { + return false; + } + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function _contains(Set storage set, bytes32 value) private view returns (bool) { + return set._indexes[value] != 0; + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function _length(Set storage set) private view returns (uint256) { + return set._values.length; + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function _at(Set storage set, uint256 index) private view returns (bytes32) { + require(set._values.length > index, "EnumerableSet: index out of bounds"); + return set._values[index]; + } + + // AddressSet + + struct AddressSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(AddressSet storage set, address value) internal returns (bool) { + return _add(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(AddressSet storage set, address value) internal returns (bool) { + return _remove(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(AddressSet storage set, address value) internal view returns (bool) { + return _contains(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns the number of values in the set. O(1). + */ + function length(AddressSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(AddressSet storage set, uint256 index) internal view returns (address) { + return address(uint256(_at(set._inner, index))); + } + + + // UintSet + + struct UintSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(UintSet storage set, uint256 value) internal returns (bool) { + return _add(set._inner, bytes32(value)); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(UintSet storage set, uint256 value) internal returns (bool) { + return _remove(set._inner, bytes32(value)); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(UintSet storage set, uint256 value) internal view returns (bool) { + return _contains(set._inner, bytes32(value)); + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function length(UintSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(UintSet storage set, uint256 index) internal view returns (uint256) { + return uint256(_at(set._inner, index)); + } +} + +// File: @openzeppelin/contracts/access/AccessControl.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + +/** + * @dev Contract module that allows children to implement role-based access + * control mechanisms. + * + * Roles are referred to by their `bytes32` identifier. These should be exposed + * in the external API and be unique. The best way to achieve this is by + * using `public constant` hash digests: + * + * ``` + * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); + * ``` + * + * Roles can be used to represent a set of permissions. To restrict access to a + * function call, use {hasRole}: + * + * ``` + * function foo() public { + * require(hasRole(MY_ROLE, msg.sender)); + * ... + * } + * ``` + * + * Roles can be granted and revoked dynamically via the {grantRole} and + * {revokeRole} functions. Each role has an associated admin role, and only + * accounts that have a role's admin role can call {grantRole} and {revokeRole}. + * + * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means + * that only accounts with this role will be able to grant or revoke other + * roles. More complex role relationships can be created by using + * {_setRoleAdmin}. + * + * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to + * grant and revoke this role. Extra precautions should be taken to secure + * accounts that have been granted it. + */ +abstract contract AccessControl is Context { + using EnumerableSet for EnumerableSet.AddressSet; + using Address for address; + + struct RoleData { + EnumerableSet.AddressSet members; + bytes32 adminRole; + } + + mapping (bytes32 => RoleData) private _roles; + + bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; + + /** + * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` + * + * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite + * {RoleAdminChanged} not being emitted signaling this. + * + * _Available since v3.1._ + */ + event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); + + /** + * @dev Emitted when `account` is granted `role`. + * + * `sender` is the account that originated the contract call, an admin role + * bearer except when using {_setupRole}. + */ + event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Emitted when `account` is revoked `role`. + * + * `sender` is the account that originated the contract call: + * - if using `revokeRole`, it is the admin role bearer + * - if using `renounceRole`, it is the role bearer (i.e. `account`) + */ + event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Returns `true` if `account` has been granted `role`. + */ + function hasRole(bytes32 role, address account) public view returns (bool) { + return _roles[role].members.contains(account); + } + + /** + * @dev Returns the number of accounts that have `role`. Can be used + * together with {getRoleMember} to enumerate all bearers of a role. + */ + function getRoleMemberCount(bytes32 role) public view returns (uint256) { + return _roles[role].members.length(); + } + + /** + * @dev Returns one of the accounts that have `role`. `index` must be a + * value between 0 and {getRoleMemberCount}, non-inclusive. + * + * Role bearers are not sorted in any particular way, and their ordering may + * change at any point. + * + * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure + * you perform all queries on the same block. See the following + * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] + * for more information. + */ + function getRoleMember(bytes32 role, uint256 index) public view returns (address) { + return _roles[role].members.at(index); + } + + /** + * @dev Returns the admin role that controls `role`. See {grantRole} and + * {revokeRole}. + * + * To change a role's admin, use {_setRoleAdmin}. + */ + function getRoleAdmin(bytes32 role) public view returns (bytes32) { + return _roles[role].adminRole; + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function grantRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); + + _grantRole(role, account); + } + + /** + * @dev Revokes `role` from `account`. + * + * If `account` had been granted `role`, emits a {RoleRevoked} event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function revokeRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); + + _revokeRole(role, account); + } + + /** + * @dev Revokes `role` from the calling account. + * + * Roles are often managed via {grantRole} and {revokeRole}: this function's + * purpose is to provide a mechanism for accounts to lose their privileges + * if they are compromised (such as when a trusted device is misplaced). + * + * If the calling account had been granted `role`, emits a {RoleRevoked} + * event. + * + * Requirements: + * + * - the caller must be `account`. + */ + function renounceRole(bytes32 role, address account) public virtual { + require(account == _msgSender(), "AccessControl: can only renounce roles for self"); + + _revokeRole(role, account); + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. Note that unlike {grantRole}, this function doesn't perform any + * checks on the calling account. + * + * [WARNING] + * ==== + * This function should only be called from the constructor when setting + * up the initial roles for the system. + * + * Using this function in any other way is effectively circumventing the admin + * system imposed by {AccessControl}. + * ==== + */ + function _setupRole(bytes32 role, address account) internal virtual { + _grantRole(role, account); + } + + /** + * @dev Sets `adminRole` as ``role``'s admin role. + * + * Emits a {RoleAdminChanged} event. + */ + function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { + emit RoleAdminChanged(role, _roles[role].adminRole, adminRole); + _roles[role].adminRole = adminRole; + } + + function _grantRole(bytes32 role, address account) private { + if (_roles[role].members.add(account)) { + emit RoleGranted(role, account, _msgSender()); + } + } + + function _revokeRole(bytes32 role, address account) private { + if (_roles[role].members.remove(account)) { + emit RoleRevoked(role, account, _msgSender()); + } + } +} + +// File: contracts/common/AccessControlMixin.sol + +pragma solidity 0.6.6; + + +contract AccessControlMixin is AccessControl { + string private _revertMsg; + function _setupContractId(string memory contractId) internal { + _revertMsg = string(abi.encodePacked(contractId, ": INSUFFICIENT_PERMISSIONS")); + } + + modifier only(bytes32 role) { + require( + hasRole(role, _msgSender()), + _revertMsg + ); + _; + } +} + +// File: contracts/child/ChildToken/IChildToken.sol + +pragma solidity 0.6.6; + +interface IChildToken { + function deposit(address user, bytes calldata depositData) external; +} + +// File: contracts/common/Initializable.sol + +pragma solidity 0.6.6; + +contract Initializable { + bool inited = false; + + modifier initializer() { + require(!inited, "already inited"); + _; + inited = true; + } +} + +// File: contracts/common/EIP712Base.sol + +pragma solidity 0.6.6; + + +contract EIP712Base is Initializable { + struct EIP712Domain { + string name; + string version; + address verifyingContract; + bytes32 salt; + } + + string constant public ERC712_VERSION = "1"; + + bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256( + bytes( + "EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)" + ) + ); + bytes32 internal domainSeperator; + + // supposed to be called once while initializing. + // one of the contractsa that inherits this contract follows proxy pattern + // so it is not possible to do this in a constructor + function _initializeEIP712( + string memory name + ) + internal + initializer + { + _setDomainSeperator(name); + } + + function _setDomainSeperator(string memory name) internal { + domainSeperator = keccak256( + abi.encode( + EIP712_DOMAIN_TYPEHASH, + keccak256(bytes(name)), + keccak256(bytes(ERC712_VERSION)), + address(this), + bytes32(getChainId()) + ) + ); + } + + function getDomainSeperator() public view returns (bytes32) { + return domainSeperator; + } + + function getChainId() public pure returns (uint256) { + uint256 id; + assembly { + id := chainid() + } + return id; + } + + /** + * Accept message hash and returns hash message in EIP712 compatible form + * So that it can be used to recover signer from signature signed using EIP712 formatted data + * https://eips.ethereum.org/EIPS/eip-712 + * "\\x19" makes the encoding deterministic + * "\\x01" is the version byte to make it compatible to EIP-191 + */ + function toTypedMessageHash(bytes32 messageHash) + internal + view + returns (bytes32) + { + return + keccak256( + abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash) + ); + } +} + +// File: contracts/common/NativeMetaTransaction.sol + +pragma solidity 0.6.6; + + + +contract NativeMetaTransaction is EIP712Base { + using SafeMath for uint256; + bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256( + bytes( + "MetaTransaction(uint256 nonce,address from,bytes functionSignature)" + ) + ); + event MetaTransactionExecuted( + address userAddress, + address payable relayerAddress, + bytes functionSignature + ); + mapping(address => uint256) nonces; + + /* + * Meta transaction structure. + * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas + * He should call the desired function directly in that case. + */ + struct MetaTransaction { + uint256 nonce; + address from; + bytes functionSignature; + } + + function executeMetaTransaction( + address userAddress, + bytes memory functionSignature, + bytes32 sigR, + bytes32 sigS, + uint8 sigV + ) public payable returns (bytes memory) { + MetaTransaction memory metaTx = MetaTransaction({ + nonce: nonces[userAddress], + from: userAddress, + functionSignature: functionSignature + }); + + require( + verify(userAddress, metaTx, sigR, sigS, sigV), + "Signer and signature do not match" + ); + + // increase nonce for user (to avoid re-use) + nonces[userAddress] = nonces[userAddress].add(1); + + emit MetaTransactionExecuted( + userAddress, + msg.sender, + functionSignature + ); + + // Append userAddress and relayer address at the end to extract it from calling context + (bool success, bytes memory returnData) = address(this).call( + abi.encodePacked(functionSignature, userAddress) + ); + require(success, "Function call not successful"); + + return returnData; + } + + function hashMetaTransaction(MetaTransaction memory metaTx) + internal + pure + returns (bytes32) + { + return + keccak256( + abi.encode( + META_TRANSACTION_TYPEHASH, + metaTx.nonce, + metaTx.from, + keccak256(metaTx.functionSignature) + ) + ); + } + + function getNonce(address user) public view returns (uint256 nonce) { + nonce = nonces[user]; + } + + function verify( + address signer, + MetaTransaction memory metaTx, + bytes32 sigR, + bytes32 sigS, + uint8 sigV + ) internal view returns (bool) { + require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER"); + return + signer == + ecrecover( + toTypedMessageHash(hashMetaTransaction(metaTx)), + sigV, + sigR, + sigS + ); + } +} + +// File: contracts/common/ContextMixin.sol + +pragma solidity 0.6.6; + +abstract contract ContextMixin { + function msgSender() + internal + view + returns (address payable sender) + { + if (msg.sender == address(this)) { + bytes memory array = msg.data; + uint256 index = msg.data.length; + assembly { + // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those. + sender := and( + mload(add(array, index)), + 0xffffffffffffffffffffffffffffffffffffffff + ) + } + } else { + sender = msg.sender; + } + return sender; + } +} + +// File: contracts/child/ChildToken/ChildMintableERC20.sol + +pragma solidity 0.6.6; + + + + + + + +contract ChildMintableERC20 is + ERC20, + IChildToken, + AccessControlMixin, + NativeMetaTransaction, + ContextMixin +{ + bytes32 public constant DEPOSITOR_ROLE = keccak256("DEPOSITOR_ROLE"); + + constructor( + string memory name_, + string memory symbol_, + uint8 decimals_, + address childChainManager + ) public ERC20(name_, symbol_) { + _setupContractId("ChildMintableERC20"); + _setupDecimals(decimals_); + _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); + _setupRole(DEPOSITOR_ROLE, childChainManager); + _initializeEIP712(name_); + } + + // This is to support Native meta transactions + // never use msg.sender directly, use _msgSender() instead + function _msgSender() + internal + override + view + returns (address payable sender) + { + return ContextMixin.msgSender(); + } + + /** + * @notice called when token is deposited on root chain + * @dev Should be callable only by ChildChainManager + * Should handle deposit by minting the required amount for user + * Make sure minting is done only by this function + * @param user user address for whom deposit is being done + * @param depositData abi encoded amount + */ + function deposit(address user, bytes calldata depositData) + external + override + only(DEPOSITOR_ROLE) + { + uint256 amount = abi.decode(depositData, (uint256)); + _mint(user, amount); + } + + /** + * @notice called when user wants to withdraw tokens back to root chain + * @dev Should burn user's tokens. This transaction will be verified when exiting on root chain + * @param amount amount of tokens to withdraw + */ + function withdraw(uint256 amount) external { + _burn(_msgSender(), amount); + } + + /** + * @notice Example function to handle minting tokens on matic chain + * @dev Minting can be done as per requirement, + * This implementation allows only admin to mint tokens but it can be changed as per requirement + * @param user user for whom tokens are being minted + * @param amount amount of token to mint + */ + function mint(address user, uint256 amount) public only(DEFAULT_ADMIN_ROLE) { + _mint(user, amount); + } +} diff --git a/flat/DummyMintableERC1155.sol b/flat/DummyMintableERC1155.sol new file mode 100644 index 00000000..0a8dd5bb --- /dev/null +++ b/flat/DummyMintableERC1155.sol @@ -0,0 +1,1811 @@ + +// File: @openzeppelin/contracts/introspection/IERC165.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Interface of the ERC165 standard, as defined in the + * https://eips.ethereum.org/EIPS/eip-165[EIP]. + * + * Implementers can declare support of contract interfaces, which can then be + * queried by others ({ERC165Checker}). + * + * For an implementation, see {ERC165}. + */ +interface IERC165 { + /** + * @dev Returns true if this contract implements the interface defined by + * `interfaceId`. See the corresponding + * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] + * to learn more about how these ids are created. + * + * This function call must use less than 30 000 gas. + */ + function supportsInterface(bytes4 interfaceId) external view returns (bool); +} + +// File: @openzeppelin/contracts/token/ERC1155/IERC1155.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + + +/** + * @dev Required interface of an ERC1155 compliant contract, as defined in the + * https://eips.ethereum.org/EIPS/eip-1155[EIP]. + * + * _Available since v3.1._ + */ +interface IERC1155 is IERC165 { + /** + * @dev Emitted when `value` tokens of token type `id` are transfered from `from` to `to` by `operator`. + */ + event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value); + + /** + * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all + * transfers. + */ + event TransferBatch(address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values); + + /** + * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to + * `approved`. + */ + event ApprovalForAll(address indexed account, address indexed operator, bool approved); + + /** + * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI. + * + * If an {URI} event was emitted for `id`, the standard + * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value + * returned by {IERC1155MetadataURI-uri}. + */ + event URI(string value, uint256 indexed id); + + /** + * @dev Returns the amount of tokens of token type `id` owned by `account`. + * + * Requirements: + * + * - `account` cannot be the zero address. + */ + function balanceOf(address account, uint256 id) external view returns (uint256); + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}. + * + * Requirements: + * + * - `accounts` and `ids` must have the same length. + */ + function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory); + + /** + * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`, + * + * Emits an {ApprovalForAll} event. + * + * Requirements: + * + * - `operator` cannot be the caller. + */ + function setApprovalForAll(address operator, bool approved) external; + + /** + * @dev Returns true if `operator` is approved to transfer ``account``'s tokens. + * + * See {setApprovalForAll}. + */ + function isApprovedForAll(address account, address operator) external view returns (bool); + + /** + * @dev Transfers `amount` tokens of token type `id` from `from` to `to`. + * + * Emits a {TransferSingle} event. + * + * Requirements: + * + * - `to` cannot be the zero address. + * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}. + * - `from` must have a balance of tokens of type `id` of at least `amount`. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the + * acceptance magic value. + */ + function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external; + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}. + * + * Emits a {TransferBatch} event. + * + * Requirements: + * + * - `ids` and `amounts` must have the same length. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the + * acceptance magic value. + */ + function safeBatchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external; +} + +// File: @openzeppelin/contracts/token/ERC1155/IERC1155MetadataURI.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + + +/** + * @dev Interface of the optional ERC1155MetadataExtension interface, as defined + * in the https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[EIP]. + * + * _Available since v3.1._ + */ +interface IERC1155MetadataURI is IERC1155 { + /** + * @dev Returns the URI for token type `id`. + * + * If the `\{id\}` substring is present in the URI, it must be replaced by + * clients with the actual token type ID. + */ + function uri(uint256 id) external view returns (string memory); +} + +// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + +/** + * _Available since v3.1._ + */ +interface IERC1155Receiver is IERC165 { + + /** + @dev Handles the receipt of a single ERC1155 token type. This function is + called at the end of a `safeTransferFrom` after the balance has been updated. + To accept the transfer, this must return + `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` + (i.e. 0xf23a6e61, or its own function selector). + @param operator The address which initiated the transfer (i.e. msg.sender) + @param from The address which previously owned the token + @param id The ID of the token being transferred + @param value The amount of tokens being transferred + @param data Additional data with no specified format + @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed + */ + function onERC1155Received( + address operator, + address from, + uint256 id, + uint256 value, + bytes calldata data + ) + external + returns(bytes4); + + /** + @dev Handles the receipt of a multiple ERC1155 token types. This function + is called at the end of a `safeBatchTransferFrom` after the balances have + been updated. To accept the transfer(s), this must return + `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` + (i.e. 0xbc197c81, or its own function selector). + @param operator The address which initiated the batch transfer (i.e. msg.sender) + @param from The address which previously owned the token + @param ids An array containing ids of each token being transferred (order and length must match values array) + @param values An array containing amounts of each token being transferred (order and length must match ids array) + @param data Additional data with no specified format + @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed + */ + function onERC1155BatchReceived( + address operator, + address from, + uint256[] calldata ids, + uint256[] calldata values, + bytes calldata data + ) + external + returns(bytes4); +} + +// File: @openzeppelin/contracts/GSN/Context.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/* + * @dev Provides information about the current execution context, including the + * sender of the transaction and its data. While these are generally available + * via msg.sender and msg.data, they should not be accessed in such a direct + * manner, since when dealing with GSN meta-transactions the account sending and + * paying for execution may not be the actual sender (as far as an application + * is concerned). + * + * This contract is only required for intermediate, library-like contracts. + */ +abstract contract Context { + function _msgSender() internal view virtual returns (address payable) { + return msg.sender; + } + + function _msgData() internal view virtual returns (bytes memory) { + this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 + return msg.data; + } +} + +// File: @openzeppelin/contracts/introspection/ERC165.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + +/** + * @dev Implementation of the {IERC165} interface. + * + * Contracts may inherit from this and call {_registerInterface} to declare + * their support of an interface. + */ +contract ERC165 is IERC165 { + /* + * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 + */ + bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; + + /** + * @dev Mapping of interface ids to whether or not it's supported. + */ + mapping(bytes4 => bool) private _supportedInterfaces; + + constructor () internal { + // Derived contracts need only register support for their own interfaces, + // we register support for ERC165 itself here + _registerInterface(_INTERFACE_ID_ERC165); + } + + /** + * @dev See {IERC165-supportsInterface}. + * + * Time complexity O(1), guaranteed to always use less than 30 000 gas. + */ + function supportsInterface(bytes4 interfaceId) public view override returns (bool) { + return _supportedInterfaces[interfaceId]; + } + + /** + * @dev Registers the contract as an implementer of the interface defined by + * `interfaceId`. Support of the actual ERC165 interface is automatic and + * registering its interface id is not required. + * + * See {IERC165-supportsInterface}. + * + * Requirements: + * + * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`). + */ + function _registerInterface(bytes4 interfaceId) internal virtual { + require(interfaceId != 0xffffffff, "ERC165: invalid interface id"); + _supportedInterfaces[interfaceId] = true; + } +} + +// File: @openzeppelin/contracts/math/SafeMath.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Wrappers over Solidity's arithmetic operations with added overflow + * checks. + * + * Arithmetic operations in Solidity wrap on overflow. This can easily result + * in bugs, because programmers usually assume that an overflow raises an + * error, which is the standard behavior in high level programming languages. + * `SafeMath` restores this intuition by reverting the transaction when an + * operation overflows. + * + * Using this library instead of the unchecked operations eliminates an entire + * class of bugs, so it's recommended to use it always. + */ +library SafeMath { + /** + * @dev Returns the addition of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `+` operator. + * + * Requirements: + * + * - Addition cannot overflow. + */ + function add(uint256 a, uint256 b) internal pure returns (uint256) { + uint256 c = a + b; + require(c >= a, "SafeMath: addition overflow"); + + return c; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b) internal pure returns (uint256) { + return sub(a, b, "SafeMath: subtraction overflow"); + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting with custom message on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b <= a, errorMessage); + uint256 c = a - b; + + return c; + } + + /** + * @dev Returns the multiplication of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `*` operator. + * + * Requirements: + * + * - Multiplication cannot overflow. + */ + function mul(uint256 a, uint256 b) internal pure returns (uint256) { + // Gas optimization: this is cheaper than requiring 'a' not being zero, but the + // benefit is lost if 'b' is also tested. + // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 + if (a == 0) { + return 0; + } + + uint256 c = a * b; + require(c / a == b, "SafeMath: multiplication overflow"); + + return c; + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b) internal pure returns (uint256) { + return div(a, b, "SafeMath: division by zero"); + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts with custom message on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b > 0, errorMessage); + uint256 c = a / b; + // assert(a == b * c + a % b); // There is no case in which this doesn't hold + + return c; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b) internal pure returns (uint256) { + return mod(a, b, "SafeMath: modulo by zero"); + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts with custom message when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b != 0, errorMessage); + return a % b; + } +} + +// File: @openzeppelin/contracts/utils/Address.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + +/** + * @dev Collection of functions related to the address type + */ +library Address { + /** + * @dev Returns true if `account` is a contract. + * + * [IMPORTANT] + * ==== + * It is unsafe to assume that an address for which this function returns + * false is an externally-owned account (EOA) and not a contract. + * + * Among others, `isContract` will return false for the following + * types of addresses: + * + * - an externally-owned account + * - a contract in construction + * - an address where a contract will be created + * - an address where a contract lived, but was destroyed + * ==== + */ + function isContract(address account) internal view returns (bool) { + // According to EIP-1052, 0x0 is the value returned for not-yet created accounts + // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned + // for accounts without code, i.e. `keccak256('')` + bytes32 codehash; + bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; + // solhint-disable-next-line no-inline-assembly + assembly { codehash := extcodehash(account) } + return (codehash != accountHash && codehash != 0x0); + } + + /** + * @dev Replacement for Solidity's `transfer`: sends `amount` wei to + * `recipient`, forwarding all available gas and reverting on errors. + * + * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost + * of certain opcodes, possibly making contracts go over the 2300 gas limit + * imposed by `transfer`, making them unable to receive funds via + * `transfer`. {sendValue} removes this limitation. + * + * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. + * + * IMPORTANT: because control is transferred to `recipient`, care must be + * taken to not create reentrancy vulnerabilities. Consider using + * {ReentrancyGuard} or the + * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. + */ + function sendValue(address payable recipient, uint256 amount) internal { + require(address(this).balance >= amount, "Address: insufficient balance"); + + // solhint-disable-next-line avoid-low-level-calls, avoid-call-value + (bool success, ) = recipient.call{ value: amount }(""); + require(success, "Address: unable to send value, recipient may have reverted"); + } + + /** + * @dev Performs a Solidity function call using a low level `call`. A + * plain`call` is an unsafe replacement for a function call: use this + * function instead. + * + * If `target` reverts with a revert reason, it is bubbled up by this + * function (like regular Solidity function calls). + * + * Returns the raw returned data. To convert to the expected return value, + * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. + * + * Requirements: + * + * - `target` must be a contract. + * - calling `target` with `data` must not revert. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data) internal returns (bytes memory) { + return functionCall(target, data, "Address: low-level call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with + * `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { + return _functionCallWithValue(target, data, 0, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but also transferring `value` wei to `target`. + * + * Requirements: + * + * - the calling contract must have an ETH balance of at least `value`. + * - the called Solidity function must be `payable`. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { + return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); + } + + /** + * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but + * with `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { + require(address(this).balance >= value, "Address: insufficient balance for call"); + return _functionCallWithValue(target, data, value, errorMessage); + } + + function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { + require(isContract(target), "Address: call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); + if (success) { + return returndata; + } else { + // Look for revert reason and bubble it up if present + if (returndata.length > 0) { + // The easiest way to bubble the revert reason is using memory via assembly + + // solhint-disable-next-line no-inline-assembly + assembly { + let returndata_size := mload(returndata) + revert(add(32, returndata), returndata_size) + } + } else { + revert(errorMessage); + } + } + } +} + +// File: @openzeppelin/contracts/token/ERC1155/ERC1155.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + + + + + +/** + * + * @dev Implementation of the basic standard multi-token. + * See https://eips.ethereum.org/EIPS/eip-1155 + * Originally based on code by Enjin: https://github.com/enjin/erc-1155 + * + * _Available since v3.1._ + */ +contract ERC1155 is Context, ERC165, IERC1155, IERC1155MetadataURI { + using SafeMath for uint256; + using Address for address; + + // Mapping from token ID to account balances + mapping (uint256 => mapping(address => uint256)) private _balances; + + // Mapping from account to operator approvals + mapping (address => mapping(address => bool)) private _operatorApprovals; + + // Used as the URI for all token types by relying on ID substition, e.g. https://token-cdn-domain/{id}.json + string private _uri; + + /* + * bytes4(keccak256('balanceOf(address,uint256)')) == 0x00fdd58e + * bytes4(keccak256('balanceOfBatch(address[],uint256[])')) == 0x4e1273f4 + * bytes4(keccak256('setApprovalForAll(address,bool)')) == 0xa22cb465 + * bytes4(keccak256('isApprovedForAll(address,address)')) == 0xe985e9c5 + * bytes4(keccak256('safeTransferFrom(address,address,uint256,uint256,bytes)')) == 0xf242432a + * bytes4(keccak256('safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)')) == 0x2eb2c2d6 + * + * => 0x00fdd58e ^ 0x4e1273f4 ^ 0xa22cb465 ^ + * 0xe985e9c5 ^ 0xf242432a ^ 0x2eb2c2d6 == 0xd9b67a26 + */ + bytes4 private constant _INTERFACE_ID_ERC1155 = 0xd9b67a26; + + /* + * bytes4(keccak256('uri(uint256)')) == 0x0e89341c + */ + bytes4 private constant _INTERFACE_ID_ERC1155_METADATA_URI = 0x0e89341c; + + /** + * @dev See {_setURI}. + */ + constructor (string memory uri) public { + _setURI(uri); + + // register the supported interfaces to conform to ERC1155 via ERC165 + _registerInterface(_INTERFACE_ID_ERC1155); + + // register the supported interfaces to conform to ERC1155MetadataURI via ERC165 + _registerInterface(_INTERFACE_ID_ERC1155_METADATA_URI); + } + + /** + * @dev See {IERC1155MetadataURI-uri}. + * + * This implementation returns the same URI for *all* token types. It relies + * on the token type ID substituion mechanism + * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP]. + * + * Clients calling this function must replace the `\{id\}` substring with the + * actual token type ID. + */ + function uri(uint256) external view override returns (string memory) { + return _uri; + } + + /** + * @dev See {IERC1155-balanceOf}. + * + * Requirements: + * + * - `account` cannot be the zero address. + */ + function balanceOf(address account, uint256 id) public view override returns (uint256) { + require(account != address(0), "ERC1155: balance query for the zero address"); + return _balances[id][account]; + } + + /** + * @dev See {IERC1155-balanceOfBatch}. + * + * Requirements: + * + * - `accounts` and `ids` must have the same length. + */ + function balanceOfBatch( + address[] memory accounts, + uint256[] memory ids + ) + public + view + override + returns (uint256[] memory) + { + require(accounts.length == ids.length, "ERC1155: accounts and ids length mismatch"); + + uint256[] memory batchBalances = new uint256[](accounts.length); + + for (uint256 i = 0; i < accounts.length; ++i) { + require(accounts[i] != address(0), "ERC1155: batch balance query for the zero address"); + batchBalances[i] = _balances[ids[i]][accounts[i]]; + } + + return batchBalances; + } + + /** + * @dev See {IERC1155-setApprovalForAll}. + */ + function setApprovalForAll(address operator, bool approved) public virtual override { + require(_msgSender() != operator, "ERC1155: setting approval status for self"); + + _operatorApprovals[_msgSender()][operator] = approved; + emit ApprovalForAll(_msgSender(), operator, approved); + } + + /** + * @dev See {IERC1155-isApprovedForAll}. + */ + function isApprovedForAll(address account, address operator) public view override returns (bool) { + return _operatorApprovals[account][operator]; + } + + /** + * @dev See {IERC1155-safeTransferFrom}. + */ + function safeTransferFrom( + address from, + address to, + uint256 id, + uint256 amount, + bytes memory data + ) + public + virtual + override + { + require(to != address(0), "ERC1155: transfer to the zero address"); + require( + from == _msgSender() || isApprovedForAll(from, _msgSender()), + "ERC1155: caller is not owner nor approved" + ); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, from, to, _asSingletonArray(id), _asSingletonArray(amount), data); + + _balances[id][from] = _balances[id][from].sub(amount, "ERC1155: insufficient balance for transfer"); + _balances[id][to] = _balances[id][to].add(amount); + + emit TransferSingle(operator, from, to, id, amount); + + _doSafeTransferAcceptanceCheck(operator, from, to, id, amount, data); + } + + /** + * @dev See {IERC1155-safeBatchTransferFrom}. + */ + function safeBatchTransferFrom( + address from, + address to, + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) + public + virtual + override + { + require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); + require(to != address(0), "ERC1155: transfer to the zero address"); + require( + from == _msgSender() || isApprovedForAll(from, _msgSender()), + "ERC1155: transfer caller is not owner nor approved" + ); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, from, to, ids, amounts, data); + + for (uint256 i = 0; i < ids.length; ++i) { + uint256 id = ids[i]; + uint256 amount = amounts[i]; + + _balances[id][from] = _balances[id][from].sub( + amount, + "ERC1155: insufficient balance for transfer" + ); + _balances[id][to] = _balances[id][to].add(amount); + } + + emit TransferBatch(operator, from, to, ids, amounts); + + _doSafeBatchTransferAcceptanceCheck(operator, from, to, ids, amounts, data); + } + + /** + * @dev Sets a new URI for all token types, by relying on the token type ID + * substituion mechanism + * https://eips.ethereum.org/EIPS/eip-1155#metadata[defined in the EIP]. + * + * By this mechanism, any occurence of the `\{id\}` substring in either the + * URI or any of the amounts in the JSON file at said URI will be replaced by + * clients with the token type ID. + * + * For example, the `https://token-cdn-domain/\{id\}.json` URI would be + * interpreted by clients as + * `https://token-cdn-domain/000000000000000000000000000000000000000000000000000000000004cce0.json` + * for token type ID 0x4cce0. + * + * See {uri}. + * + * Because these URIs cannot be meaningfully represented by the {URI} event, + * this function emits no events. + */ + function _setURI(string memory newuri) internal virtual { + _uri = newuri; + } + + /** + * @dev Creates `amount` tokens of token type `id`, and assigns them to `account`. + * + * Emits a {TransferSingle} event. + * + * Requirements: + * + * - `account` cannot be the zero address. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the + * acceptance magic value. + */ + function _mint(address account, uint256 id, uint256 amount, bytes memory data) internal virtual { + require(account != address(0), "ERC1155: mint to the zero address"); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, address(0), account, _asSingletonArray(id), _asSingletonArray(amount), data); + + _balances[id][account] = _balances[id][account].add(amount); + emit TransferSingle(operator, address(0), account, id, amount); + + _doSafeTransferAcceptanceCheck(operator, address(0), account, id, amount, data); + } + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_mint}. + * + * Requirements: + * + * - `ids` and `amounts` must have the same length. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the + * acceptance magic value. + */ + function _mintBatch(address to, uint256[] memory ids, uint256[] memory amounts, bytes memory data) internal virtual { + require(to != address(0), "ERC1155: mint to the zero address"); + require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, address(0), to, ids, amounts, data); + + for (uint i = 0; i < ids.length; i++) { + _balances[ids[i]][to] = amounts[i].add(_balances[ids[i]][to]); + } + + emit TransferBatch(operator, address(0), to, ids, amounts); + + _doSafeBatchTransferAcceptanceCheck(operator, address(0), to, ids, amounts, data); + } + + /** + * @dev Destroys `amount` tokens of token type `id` from `account` + * + * Requirements: + * + * - `account` cannot be the zero address. + * - `account` must have at least `amount` tokens of token type `id`. + */ + function _burn(address account, uint256 id, uint256 amount) internal virtual { + require(account != address(0), "ERC1155: burn from the zero address"); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, account, address(0), _asSingletonArray(id), _asSingletonArray(amount), ""); + + _balances[id][account] = _balances[id][account].sub( + amount, + "ERC1155: burn amount exceeds balance" + ); + + emit TransferSingle(operator, account, address(0), id, amount); + } + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {_burn}. + * + * Requirements: + * + * - `ids` and `amounts` must have the same length. + */ + function _burnBatch(address account, uint256[] memory ids, uint256[] memory amounts) internal virtual { + require(account != address(0), "ERC1155: burn from the zero address"); + require(ids.length == amounts.length, "ERC1155: ids and amounts length mismatch"); + + address operator = _msgSender(); + + _beforeTokenTransfer(operator, account, address(0), ids, amounts, ""); + + for (uint i = 0; i < ids.length; i++) { + _balances[ids[i]][account] = _balances[ids[i]][account].sub( + amounts[i], + "ERC1155: burn amount exceeds balance" + ); + } + + emit TransferBatch(operator, account, address(0), ids, amounts); + } + + /** + * @dev Hook that is called before any token transfer. This includes minting + * and burning, as well as batched variants. + * + * The same hook is called on both single and batched variants. For single + * transfers, the length of the `id` and `amount` arrays will be 1. + * + * Calling conditions (for each `id` and `amount` pair): + * + * - When `from` and `to` are both non-zero, `amount` of ``from``'s tokens + * of token type `id` will be transferred to `to`. + * - When `from` is zero, `amount` tokens of token type `id` will be minted + * for `to`. + * - when `to` is zero, `amount` of ``from``'s tokens of token type `id` + * will be burned. + * - `from` and `to` are never both zero. + * - `ids` and `amounts` have the same, non-zero length. + * + * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. + */ + function _beforeTokenTransfer( + address operator, + address from, + address to, + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) + internal virtual + { } + + function _doSafeTransferAcceptanceCheck( + address operator, + address from, + address to, + uint256 id, + uint256 amount, + bytes memory data + ) + private + { + if (to.isContract()) { + try IERC1155Receiver(to).onERC1155Received(operator, from, id, amount, data) returns (bytes4 response) { + if (response != IERC1155Receiver(to).onERC1155Received.selector) { + revert("ERC1155: ERC1155Receiver rejected tokens"); + } + } catch Error(string memory reason) { + revert(reason); + } catch { + revert("ERC1155: transfer to non ERC1155Receiver implementer"); + } + } + } + + function _doSafeBatchTransferAcceptanceCheck( + address operator, + address from, + address to, + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) + private + { + if (to.isContract()) { + try IERC1155Receiver(to).onERC1155BatchReceived(operator, from, ids, amounts, data) returns (bytes4 response) { + if (response != IERC1155Receiver(to).onERC1155BatchReceived.selector) { + revert("ERC1155: ERC1155Receiver rejected tokens"); + } + } catch Error(string memory reason) { + revert(reason); + } catch { + revert("ERC1155: transfer to non ERC1155Receiver implementer"); + } + } + } + + function _asSingletonArray(uint256 element) private pure returns (uint256[] memory) { + uint256[] memory array = new uint256[](1); + array[0] = element; + + return array; + } +} + +// File: contracts/root/RootToken/IMintableERC1155.sol + +pragma solidity 0.6.6; + +interface IMintableERC1155 is IERC1155 { + /** + * @notice Creates `amount` tokens of token type `id`, and assigns them to `account`. + * @dev Should be callable only by MintableERC1155Predicate + * Make sure minting is done only by this function + * @param account user address for whom token is being minted + * @param id token which is being minted + * @param amount amount of token being minted + * @param data extra byte data to be accompanied with minted tokens + */ + function mint(address account, uint256 id, uint256 amount, bytes calldata data) external; + + /** + * @notice Batched version of singular token minting, where + * for each token in `ids` respective amount to be minted from `amounts` + * array, for address `to`. + * @dev Should be callable only by MintableERC1155Predicate + * Make sure minting is done only by this function + * @param to user address for whom token is being minted + * @param ids tokens which are being minted + * @param amounts amount of each token being minted + * @param data extra byte data to be accompanied with minted tokens + */ + function mintBatch(address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external; +} + +// File: contracts/common/Initializable.sol + +pragma solidity 0.6.6; + +contract Initializable { + bool inited = false; + + modifier initializer() { + require(!inited, "already inited"); + _; + inited = true; + } +} + +// File: contracts/common/EIP712Base.sol + +pragma solidity 0.6.6; + + +contract EIP712Base is Initializable { + struct EIP712Domain { + string name; + string version; + address verifyingContract; + bytes32 salt; + } + + string constant public ERC712_VERSION = "1"; + + bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256( + bytes( + "EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)" + ) + ); + bytes32 internal domainSeperator; + + // supposed to be called once while initializing. + // one of the contractsa that inherits this contract follows proxy pattern + // so it is not possible to do this in a constructor + function _initializeEIP712( + string memory name + ) + internal + initializer + { + _setDomainSeperator(name); + } + + function _setDomainSeperator(string memory name) internal { + domainSeperator = keccak256( + abi.encode( + EIP712_DOMAIN_TYPEHASH, + keccak256(bytes(name)), + keccak256(bytes(ERC712_VERSION)), + address(this), + bytes32(getChainId()) + ) + ); + } + + function getDomainSeperator() public view returns (bytes32) { + return domainSeperator; + } + + function getChainId() public pure returns (uint256) { + uint256 id; + assembly { + id := chainid() + } + return id; + } + + /** + * Accept message hash and returns hash message in EIP712 compatible form + * So that it can be used to recover signer from signature signed using EIP712 formatted data + * https://eips.ethereum.org/EIPS/eip-712 + * "\\x19" makes the encoding deterministic + * "\\x01" is the version byte to make it compatible to EIP-191 + */ + function toTypedMessageHash(bytes32 messageHash) + internal + view + returns (bytes32) + { + return + keccak256( + abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash) + ); + } +} + +// File: contracts/common/NativeMetaTransaction.sol + +pragma solidity 0.6.6; + + + +contract NativeMetaTransaction is EIP712Base { + using SafeMath for uint256; + bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256( + bytes( + "MetaTransaction(uint256 nonce,address from,bytes functionSignature)" + ) + ); + event MetaTransactionExecuted( + address userAddress, + address payable relayerAddress, + bytes functionSignature + ); + mapping(address => uint256) nonces; + + /* + * Meta transaction structure. + * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas + * He should call the desired function directly in that case. + */ + struct MetaTransaction { + uint256 nonce; + address from; + bytes functionSignature; + } + + function executeMetaTransaction( + address userAddress, + bytes memory functionSignature, + bytes32 sigR, + bytes32 sigS, + uint8 sigV + ) public payable returns (bytes memory) { + MetaTransaction memory metaTx = MetaTransaction({ + nonce: nonces[userAddress], + from: userAddress, + functionSignature: functionSignature + }); + + require( + verify(userAddress, metaTx, sigR, sigS, sigV), + "Signer and signature do not match" + ); + + // increase nonce for user (to avoid re-use) + nonces[userAddress] = nonces[userAddress].add(1); + + emit MetaTransactionExecuted( + userAddress, + msg.sender, + functionSignature + ); + + // Append userAddress and relayer address at the end to extract it from calling context + (bool success, bytes memory returnData) = address(this).call( + abi.encodePacked(functionSignature, userAddress) + ); + require(success, "Function call not successful"); + + return returnData; + } + + function hashMetaTransaction(MetaTransaction memory metaTx) + internal + pure + returns (bytes32) + { + return + keccak256( + abi.encode( + META_TRANSACTION_TYPEHASH, + metaTx.nonce, + metaTx.from, + keccak256(metaTx.functionSignature) + ) + ); + } + + function getNonce(address user) public view returns (uint256 nonce) { + nonce = nonces[user]; + } + + function verify( + address signer, + MetaTransaction memory metaTx, + bytes32 sigR, + bytes32 sigS, + uint8 sigV + ) internal view returns (bool) { + require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER"); + return + signer == + ecrecover( + toTypedMessageHash(hashMetaTransaction(metaTx)), + sigV, + sigR, + sigS + ); + } +} + +// File: contracts/common/ContextMixin.sol + +pragma solidity 0.6.6; + +abstract contract ContextMixin { + function msgSender() + internal + view + returns (address payable sender) + { + if (msg.sender == address(this)) { + bytes memory array = msg.data; + uint256 index = msg.data.length; + assembly { + // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those. + sender := and( + mload(add(array, index)), + 0xffffffffffffffffffffffffffffffffffffffff + ) + } + } else { + sender = msg.sender; + } + return sender; + } +} + +// File: @openzeppelin/contracts/utils/EnumerableSet.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Library for managing + * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive + * types. + * + * Sets have the following properties: + * + * - Elements are added, removed, and checked for existence in constant time + * (O(1)). + * - Elements are enumerated in O(n). No guarantees are made on the ordering. + * + * ``` + * contract Example { + * // Add the library methods + * using EnumerableSet for EnumerableSet.AddressSet; + * + * // Declare a set state variable + * EnumerableSet.AddressSet private mySet; + * } + * ``` + * + * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256` + * (`UintSet`) are supported. + */ +library EnumerableSet { + // To implement this library for multiple types with as little code + // repetition as possible, we write it in terms of a generic Set type with + // bytes32 values. + // The Set implementation uses private functions, and user-facing + // implementations (such as AddressSet) are just wrappers around the + // underlying Set. + // This means that we can only create new EnumerableSets for types that fit + // in bytes32. + + struct Set { + // Storage of set values + bytes32[] _values; + + // Position of the value in the `values` array, plus 1 because index 0 + // means a value is not in the set. + mapping (bytes32 => uint256) _indexes; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function _add(Set storage set, bytes32 value) private returns (bool) { + if (!_contains(set, value)) { + set._values.push(value); + // The value is stored at length-1, but we add 1 to all indexes + // and use 0 as a sentinel value + set._indexes[value] = set._values.length; + return true; + } else { + return false; + } + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function _remove(Set storage set, bytes32 value) private returns (bool) { + // We read and store the value's index to prevent multiple reads from the same storage slot + uint256 valueIndex = set._indexes[value]; + + if (valueIndex != 0) { // Equivalent to contains(set, value) + // To delete an element from the _values array in O(1), we swap the element to delete with the last one in + // the array, and then remove the last element (sometimes called as 'swap and pop'). + // This modifies the order of the array, as noted in {at}. + + uint256 toDeleteIndex = valueIndex - 1; + uint256 lastIndex = set._values.length - 1; + + // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs + // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. + + bytes32 lastvalue = set._values[lastIndex]; + + // Move the last value to the index where the value to delete is + set._values[toDeleteIndex] = lastvalue; + // Update the index for the moved value + set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based + + // Delete the slot where the moved value was stored + set._values.pop(); + + // Delete the index for the deleted slot + delete set._indexes[value]; + + return true; + } else { + return false; + } + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function _contains(Set storage set, bytes32 value) private view returns (bool) { + return set._indexes[value] != 0; + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function _length(Set storage set) private view returns (uint256) { + return set._values.length; + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function _at(Set storage set, uint256 index) private view returns (bytes32) { + require(set._values.length > index, "EnumerableSet: index out of bounds"); + return set._values[index]; + } + + // AddressSet + + struct AddressSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(AddressSet storage set, address value) internal returns (bool) { + return _add(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(AddressSet storage set, address value) internal returns (bool) { + return _remove(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(AddressSet storage set, address value) internal view returns (bool) { + return _contains(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns the number of values in the set. O(1). + */ + function length(AddressSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(AddressSet storage set, uint256 index) internal view returns (address) { + return address(uint256(_at(set._inner, index))); + } + + + // UintSet + + struct UintSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(UintSet storage set, uint256 value) internal returns (bool) { + return _add(set._inner, bytes32(value)); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(UintSet storage set, uint256 value) internal returns (bool) { + return _remove(set._inner, bytes32(value)); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(UintSet storage set, uint256 value) internal view returns (bool) { + return _contains(set._inner, bytes32(value)); + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function length(UintSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(UintSet storage set, uint256 index) internal view returns (uint256) { + return uint256(_at(set._inner, index)); + } +} + +// File: @openzeppelin/contracts/access/AccessControl.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + +/** + * @dev Contract module that allows children to implement role-based access + * control mechanisms. + * + * Roles are referred to by their `bytes32` identifier. These should be exposed + * in the external API and be unique. The best way to achieve this is by + * using `public constant` hash digests: + * + * ``` + * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); + * ``` + * + * Roles can be used to represent a set of permissions. To restrict access to a + * function call, use {hasRole}: + * + * ``` + * function foo() public { + * require(hasRole(MY_ROLE, msg.sender)); + * ... + * } + * ``` + * + * Roles can be granted and revoked dynamically via the {grantRole} and + * {revokeRole} functions. Each role has an associated admin role, and only + * accounts that have a role's admin role can call {grantRole} and {revokeRole}. + * + * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means + * that only accounts with this role will be able to grant or revoke other + * roles. More complex role relationships can be created by using + * {_setRoleAdmin}. + * + * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to + * grant and revoke this role. Extra precautions should be taken to secure + * accounts that have been granted it. + */ +abstract contract AccessControl is Context { + using EnumerableSet for EnumerableSet.AddressSet; + using Address for address; + + struct RoleData { + EnumerableSet.AddressSet members; + bytes32 adminRole; + } + + mapping (bytes32 => RoleData) private _roles; + + bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; + + /** + * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` + * + * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite + * {RoleAdminChanged} not being emitted signaling this. + * + * _Available since v3.1._ + */ + event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); + + /** + * @dev Emitted when `account` is granted `role`. + * + * `sender` is the account that originated the contract call, an admin role + * bearer except when using {_setupRole}. + */ + event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Emitted when `account` is revoked `role`. + * + * `sender` is the account that originated the contract call: + * - if using `revokeRole`, it is the admin role bearer + * - if using `renounceRole`, it is the role bearer (i.e. `account`) + */ + event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Returns `true` if `account` has been granted `role`. + */ + function hasRole(bytes32 role, address account) public view returns (bool) { + return _roles[role].members.contains(account); + } + + /** + * @dev Returns the number of accounts that have `role`. Can be used + * together with {getRoleMember} to enumerate all bearers of a role. + */ + function getRoleMemberCount(bytes32 role) public view returns (uint256) { + return _roles[role].members.length(); + } + + /** + * @dev Returns one of the accounts that have `role`. `index` must be a + * value between 0 and {getRoleMemberCount}, non-inclusive. + * + * Role bearers are not sorted in any particular way, and their ordering may + * change at any point. + * + * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure + * you perform all queries on the same block. See the following + * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] + * for more information. + */ + function getRoleMember(bytes32 role, uint256 index) public view returns (address) { + return _roles[role].members.at(index); + } + + /** + * @dev Returns the admin role that controls `role`. See {grantRole} and + * {revokeRole}. + * + * To change a role's admin, use {_setRoleAdmin}. + */ + function getRoleAdmin(bytes32 role) public view returns (bytes32) { + return _roles[role].adminRole; + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function grantRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); + + _grantRole(role, account); + } + + /** + * @dev Revokes `role` from `account`. + * + * If `account` had been granted `role`, emits a {RoleRevoked} event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function revokeRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); + + _revokeRole(role, account); + } + + /** + * @dev Revokes `role` from the calling account. + * + * Roles are often managed via {grantRole} and {revokeRole}: this function's + * purpose is to provide a mechanism for accounts to lose their privileges + * if they are compromised (such as when a trusted device is misplaced). + * + * If the calling account had been granted `role`, emits a {RoleRevoked} + * event. + * + * Requirements: + * + * - the caller must be `account`. + */ + function renounceRole(bytes32 role, address account) public virtual { + require(account == _msgSender(), "AccessControl: can only renounce roles for self"); + + _revokeRole(role, account); + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. Note that unlike {grantRole}, this function doesn't perform any + * checks on the calling account. + * + * [WARNING] + * ==== + * This function should only be called from the constructor when setting + * up the initial roles for the system. + * + * Using this function in any other way is effectively circumventing the admin + * system imposed by {AccessControl}. + * ==== + */ + function _setupRole(bytes32 role, address account) internal virtual { + _grantRole(role, account); + } + + /** + * @dev Sets `adminRole` as ``role``'s admin role. + * + * Emits a {RoleAdminChanged} event. + */ + function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { + emit RoleAdminChanged(role, _roles[role].adminRole, adminRole); + _roles[role].adminRole = adminRole; + } + + function _grantRole(bytes32 role, address account) private { + if (_roles[role].members.add(account)) { + emit RoleGranted(role, account, _msgSender()); + } + } + + function _revokeRole(bytes32 role, address account) private { + if (_roles[role].members.remove(account)) { + emit RoleRevoked(role, account, _msgSender()); + } + } +} + +// File: contracts/common/AccessControlMixin.sol + +pragma solidity 0.6.6; + + +contract AccessControlMixin is AccessControl { + string private _revertMsg; + function _setupContractId(string memory contractId) internal { + _revertMsg = string(abi.encodePacked(contractId, ": INSUFFICIENT_PERMISSIONS")); + } + + modifier only(bytes32 role) { + require( + hasRole(role, _msgSender()), + _revertMsg + ); + _; + } +} + +// File: contracts/root/RootToken/DummyMintableERC1155.sol + +pragma solidity 0.6.6; + + + + + + +contract DummyMintableERC1155 is + ERC1155, + AccessControlMixin, + NativeMetaTransaction, + ContextMixin, + IMintableERC1155 +{ + bytes32 public constant PREDICATE_ROLE = keccak256("PREDICATE_ROLE"); + + constructor(string memory uri_) public ERC1155(uri_) { + _setupContractId("DummyMintableERC1155"); + _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); + _setupRole(PREDICATE_ROLE, _msgSender()); + + _initializeEIP712(uri_); + } + + function mint( + address account, + uint256 id, + uint256 amount, + bytes calldata data + ) external override only(PREDICATE_ROLE) { + _mint(account, id, amount, data); + } + + function mintBatch( + address to, + uint256[] calldata ids, + uint256[] calldata amounts, + bytes calldata data + ) external override only(PREDICATE_ROLE) { + _mintBatch(to, ids, amounts, data); + } + + function _msgSender() + internal + override + view + returns (address payable sender) + { + return ContextMixin.msgSender(); + } +} diff --git a/flat/DummyMintableERC20.sol b/flat/DummyMintableERC20.sol new file mode 100644 index 00000000..e45c8da4 --- /dev/null +++ b/flat/DummyMintableERC20.sol @@ -0,0 +1,1493 @@ + +// File: @openzeppelin/contracts/GSN/Context.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/* + * @dev Provides information about the current execution context, including the + * sender of the transaction and its data. While these are generally available + * via msg.sender and msg.data, they should not be accessed in such a direct + * manner, since when dealing with GSN meta-transactions the account sending and + * paying for execution may not be the actual sender (as far as an application + * is concerned). + * + * This contract is only required for intermediate, library-like contracts. + */ +abstract contract Context { + function _msgSender() internal view virtual returns (address payable) { + return msg.sender; + } + + function _msgData() internal view virtual returns (bytes memory) { + this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 + return msg.data; + } +} + +// File: @openzeppelin/contracts/token/ERC20/IERC20.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Interface of the ERC20 standard as defined in the EIP. + */ +interface IERC20 { + /** + * @dev Returns the amount of tokens in existence. + */ + function totalSupply() external view returns (uint256); + + /** + * @dev Returns the amount of tokens owned by `account`. + */ + function balanceOf(address account) external view returns (uint256); + + /** + * @dev Moves `amount` tokens from the caller's account to `recipient`. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transfer(address recipient, uint256 amount) external returns (bool); + + /** + * @dev Returns the remaining number of tokens that `spender` will be + * allowed to spend on behalf of `owner` through {transferFrom}. This is + * zero by default. + * + * This value changes when {approve} or {transferFrom} are called. + */ + function allowance(address owner, address spender) external view returns (uint256); + + /** + * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * IMPORTANT: Beware that changing an allowance with this method brings the risk + * that someone may use both the old and the new allowance by unfortunate + * transaction ordering. One possible solution to mitigate this race + * condition is to first reduce the spender's allowance to 0 and set the + * desired value afterwards: + * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 + * + * Emits an {Approval} event. + */ + function approve(address spender, uint256 amount) external returns (bool); + + /** + * @dev Moves `amount` tokens from `sender` to `recipient` using the + * allowance mechanism. `amount` is then deducted from the caller's + * allowance. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); + + /** + * @dev Emitted when `value` tokens are moved from one account (`from`) to + * another (`to`). + * + * Note that `value` may be zero. + */ + event Transfer(address indexed from, address indexed to, uint256 value); + + /** + * @dev Emitted when the allowance of a `spender` for an `owner` is set by + * a call to {approve}. `value` is the new allowance. + */ + event Approval(address indexed owner, address indexed spender, uint256 value); +} + +// File: @openzeppelin/contracts/math/SafeMath.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Wrappers over Solidity's arithmetic operations with added overflow + * checks. + * + * Arithmetic operations in Solidity wrap on overflow. This can easily result + * in bugs, because programmers usually assume that an overflow raises an + * error, which is the standard behavior in high level programming languages. + * `SafeMath` restores this intuition by reverting the transaction when an + * operation overflows. + * + * Using this library instead of the unchecked operations eliminates an entire + * class of bugs, so it's recommended to use it always. + */ +library SafeMath { + /** + * @dev Returns the addition of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `+` operator. + * + * Requirements: + * + * - Addition cannot overflow. + */ + function add(uint256 a, uint256 b) internal pure returns (uint256) { + uint256 c = a + b; + require(c >= a, "SafeMath: addition overflow"); + + return c; + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b) internal pure returns (uint256) { + return sub(a, b, "SafeMath: subtraction overflow"); + } + + /** + * @dev Returns the subtraction of two unsigned integers, reverting with custom message on + * overflow (when the result is negative). + * + * Counterpart to Solidity's `-` operator. + * + * Requirements: + * + * - Subtraction cannot overflow. + */ + function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b <= a, errorMessage); + uint256 c = a - b; + + return c; + } + + /** + * @dev Returns the multiplication of two unsigned integers, reverting on + * overflow. + * + * Counterpart to Solidity's `*` operator. + * + * Requirements: + * + * - Multiplication cannot overflow. + */ + function mul(uint256 a, uint256 b) internal pure returns (uint256) { + // Gas optimization: this is cheaper than requiring 'a' not being zero, but the + // benefit is lost if 'b' is also tested. + // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 + if (a == 0) { + return 0; + } + + uint256 c = a * b; + require(c / a == b, "SafeMath: multiplication overflow"); + + return c; + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b) internal pure returns (uint256) { + return div(a, b, "SafeMath: division by zero"); + } + + /** + * @dev Returns the integer division of two unsigned integers. Reverts with custom message on + * division by zero. The result is rounded towards zero. + * + * Counterpart to Solidity's `/` operator. Note: this function uses a + * `revert` opcode (which leaves remaining gas untouched) while Solidity + * uses an invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b > 0, errorMessage); + uint256 c = a / b; + // assert(a == b * c + a % b); // There is no case in which this doesn't hold + + return c; + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b) internal pure returns (uint256) { + return mod(a, b, "SafeMath: modulo by zero"); + } + + /** + * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), + * Reverts with custom message when dividing by zero. + * + * Counterpart to Solidity's `%` operator. This function uses a `revert` + * opcode (which leaves remaining gas untouched) while Solidity uses an + * invalid opcode to revert (consuming all remaining gas). + * + * Requirements: + * + * - The divisor cannot be zero. + */ + function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { + require(b != 0, errorMessage); + return a % b; + } +} + +// File: @openzeppelin/contracts/utils/Address.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + +/** + * @dev Collection of functions related to the address type + */ +library Address { + /** + * @dev Returns true if `account` is a contract. + * + * [IMPORTANT] + * ==== + * It is unsafe to assume that an address for which this function returns + * false is an externally-owned account (EOA) and not a contract. + * + * Among others, `isContract` will return false for the following + * types of addresses: + * + * - an externally-owned account + * - a contract in construction + * - an address where a contract will be created + * - an address where a contract lived, but was destroyed + * ==== + */ + function isContract(address account) internal view returns (bool) { + // According to EIP-1052, 0x0 is the value returned for not-yet created accounts + // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned + // for accounts without code, i.e. `keccak256('')` + bytes32 codehash; + bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; + // solhint-disable-next-line no-inline-assembly + assembly { codehash := extcodehash(account) } + return (codehash != accountHash && codehash != 0x0); + } + + /** + * @dev Replacement for Solidity's `transfer`: sends `amount` wei to + * `recipient`, forwarding all available gas and reverting on errors. + * + * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost + * of certain opcodes, possibly making contracts go over the 2300 gas limit + * imposed by `transfer`, making them unable to receive funds via + * `transfer`. {sendValue} removes this limitation. + * + * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. + * + * IMPORTANT: because control is transferred to `recipient`, care must be + * taken to not create reentrancy vulnerabilities. Consider using + * {ReentrancyGuard} or the + * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. + */ + function sendValue(address payable recipient, uint256 amount) internal { + require(address(this).balance >= amount, "Address: insufficient balance"); + + // solhint-disable-next-line avoid-low-level-calls, avoid-call-value + (bool success, ) = recipient.call{ value: amount }(""); + require(success, "Address: unable to send value, recipient may have reverted"); + } + + /** + * @dev Performs a Solidity function call using a low level `call`. A + * plain`call` is an unsafe replacement for a function call: use this + * function instead. + * + * If `target` reverts with a revert reason, it is bubbled up by this + * function (like regular Solidity function calls). + * + * Returns the raw returned data. To convert to the expected return value, + * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. + * + * Requirements: + * + * - `target` must be a contract. + * - calling `target` with `data` must not revert. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data) internal returns (bytes memory) { + return functionCall(target, data, "Address: low-level call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with + * `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { + return _functionCallWithValue(target, data, 0, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but also transferring `value` wei to `target`. + * + * Requirements: + * + * - the calling contract must have an ETH balance of at least `value`. + * - the called Solidity function must be `payable`. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { + return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); + } + + /** + * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but + * with `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { + require(address(this).balance >= value, "Address: insufficient balance for call"); + return _functionCallWithValue(target, data, value, errorMessage); + } + + function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { + require(isContract(target), "Address: call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); + if (success) { + return returndata; + } else { + // Look for revert reason and bubble it up if present + if (returndata.length > 0) { + // The easiest way to bubble the revert reason is using memory via assembly + + // solhint-disable-next-line no-inline-assembly + assembly { + let returndata_size := mload(returndata) + revert(add(32, returndata), returndata_size) + } + } else { + revert(errorMessage); + } + } + } +} + +// File: @openzeppelin/contracts/token/ERC20/ERC20.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + + +/** + * @dev Implementation of the {IERC20} interface. + * + * This implementation is agnostic to the way tokens are created. This means + * that a supply mechanism has to be added in a derived contract using {_mint}. + * For a generic mechanism see {ERC20PresetMinterPauser}. + * + * TIP: For a detailed writeup see our guide + * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How + * to implement supply mechanisms]. + * + * We have followed general OpenZeppelin guidelines: functions revert instead + * of returning `false` on failure. This behavior is nonetheless conventional + * and does not conflict with the expectations of ERC20 applications. + * + * Additionally, an {Approval} event is emitted on calls to {transferFrom}. + * This allows applications to reconstruct the allowance for all accounts just + * by listening to said events. Other implementations of the EIP may not emit + * these events, as it isn't required by the specification. + * + * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} + * functions have been added to mitigate the well-known issues around setting + * allowances. See {IERC20-approve}. + */ +contract ERC20 is Context, IERC20 { + using SafeMath for uint256; + using Address for address; + + mapping (address => uint256) private _balances; + + mapping (address => mapping (address => uint256)) private _allowances; + + uint256 private _totalSupply; + + string private _name; + string private _symbol; + uint8 private _decimals; + + /** + * @dev Sets the values for {name} and {symbol}, initializes {decimals} with + * a default value of 18. + * + * To select a different value for {decimals}, use {_setupDecimals}. + * + * All three of these values are immutable: they can only be set once during + * construction. + */ + constructor (string memory name, string memory symbol) public { + _name = name; + _symbol = symbol; + _decimals = 18; + } + + /** + * @dev Returns the name of the token. + */ + function name() public view returns (string memory) { + return _name; + } + + /** + * @dev Returns the symbol of the token, usually a shorter version of the + * name. + */ + function symbol() public view returns (string memory) { + return _symbol; + } + + /** + * @dev Returns the number of decimals used to get its user representation. + * For example, if `decimals` equals `2`, a balance of `505` tokens should + * be displayed to a user as `5,05` (`505 / 10 ** 2`). + * + * Tokens usually opt for a value of 18, imitating the relationship between + * Ether and Wei. This is the value {ERC20} uses, unless {_setupDecimals} is + * called. + * + * NOTE: This information is only used for _display_ purposes: it in + * no way affects any of the arithmetic of the contract, including + * {IERC20-balanceOf} and {IERC20-transfer}. + */ + function decimals() public view returns (uint8) { + return _decimals; + } + + /** + * @dev See {IERC20-totalSupply}. + */ + function totalSupply() public view override returns (uint256) { + return _totalSupply; + } + + /** + * @dev See {IERC20-balanceOf}. + */ + function balanceOf(address account) public view override returns (uint256) { + return _balances[account]; + } + + /** + * @dev See {IERC20-transfer}. + * + * Requirements: + * + * - `recipient` cannot be the zero address. + * - the caller must have a balance of at least `amount`. + */ + function transfer(address recipient, uint256 amount) public virtual override returns (bool) { + _transfer(_msgSender(), recipient, amount); + return true; + } + + /** + * @dev See {IERC20-allowance}. + */ + function allowance(address owner, address spender) public view virtual override returns (uint256) { + return _allowances[owner][spender]; + } + + /** + * @dev See {IERC20-approve}. + * + * Requirements: + * + * - `spender` cannot be the zero address. + */ + function approve(address spender, uint256 amount) public virtual override returns (bool) { + _approve(_msgSender(), spender, amount); + return true; + } + + /** + * @dev See {IERC20-transferFrom}. + * + * Emits an {Approval} event indicating the updated allowance. This is not + * required by the EIP. See the note at the beginning of {ERC20}; + * + * Requirements: + * - `sender` and `recipient` cannot be the zero address. + * - `sender` must have a balance of at least `amount`. + * - the caller must have allowance for ``sender``'s tokens of at least + * `amount`. + */ + function transferFrom(address sender, address recipient, uint256 amount) public virtual override returns (bool) { + _transfer(sender, recipient, amount); + _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance")); + return true; + } + + /** + * @dev Atomically increases the allowance granted to `spender` by the caller. + * + * This is an alternative to {approve} that can be used as a mitigation for + * problems described in {IERC20-approve}. + * + * Emits an {Approval} event indicating the updated allowance. + * + * Requirements: + * + * - `spender` cannot be the zero address. + */ + function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { + _approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(addedValue)); + return true; + } + + /** + * @dev Atomically decreases the allowance granted to `spender` by the caller. + * + * This is an alternative to {approve} that can be used as a mitigation for + * problems described in {IERC20-approve}. + * + * Emits an {Approval} event indicating the updated allowance. + * + * Requirements: + * + * - `spender` cannot be the zero address. + * - `spender` must have allowance for the caller of at least + * `subtractedValue`. + */ + function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { + _approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero")); + return true; + } + + /** + * @dev Moves tokens `amount` from `sender` to `recipient`. + * + * This is internal function is equivalent to {transfer}, and can be used to + * e.g. implement automatic token fees, slashing mechanisms, etc. + * + * Emits a {Transfer} event. + * + * Requirements: + * + * - `sender` cannot be the zero address. + * - `recipient` cannot be the zero address. + * - `sender` must have a balance of at least `amount`. + */ + function _transfer(address sender, address recipient, uint256 amount) internal virtual { + require(sender != address(0), "ERC20: transfer from the zero address"); + require(recipient != address(0), "ERC20: transfer to the zero address"); + + _beforeTokenTransfer(sender, recipient, amount); + + _balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance"); + _balances[recipient] = _balances[recipient].add(amount); + emit Transfer(sender, recipient, amount); + } + + /** @dev Creates `amount` tokens and assigns them to `account`, increasing + * the total supply. + * + * Emits a {Transfer} event with `from` set to the zero address. + * + * Requirements + * + * - `to` cannot be the zero address. + */ + function _mint(address account, uint256 amount) internal virtual { + require(account != address(0), "ERC20: mint to the zero address"); + + _beforeTokenTransfer(address(0), account, amount); + + _totalSupply = _totalSupply.add(amount); + _balances[account] = _balances[account].add(amount); + emit Transfer(address(0), account, amount); + } + + /** + * @dev Destroys `amount` tokens from `account`, reducing the + * total supply. + * + * Emits a {Transfer} event with `to` set to the zero address. + * + * Requirements + * + * - `account` cannot be the zero address. + * - `account` must have at least `amount` tokens. + */ + function _burn(address account, uint256 amount) internal virtual { + require(account != address(0), "ERC20: burn from the zero address"); + + _beforeTokenTransfer(account, address(0), amount); + + _balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance"); + _totalSupply = _totalSupply.sub(amount); + emit Transfer(account, address(0), amount); + } + + /** + * @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens. + * + * This is internal function is equivalent to `approve`, and can be used to + * e.g. set automatic allowances for certain subsystems, etc. + * + * Emits an {Approval} event. + * + * Requirements: + * + * - `owner` cannot be the zero address. + * - `spender` cannot be the zero address. + */ + function _approve(address owner, address spender, uint256 amount) internal virtual { + require(owner != address(0), "ERC20: approve from the zero address"); + require(spender != address(0), "ERC20: approve to the zero address"); + + _allowances[owner][spender] = amount; + emit Approval(owner, spender, amount); + } + + /** + * @dev Sets {decimals} to a value other than the default one of 18. + * + * WARNING: This function should only be called from the constructor. Most + * applications that interact with token contracts will not expect + * {decimals} to ever change, and may work incorrectly if it does. + */ + function _setupDecimals(uint8 decimals_) internal { + _decimals = decimals_; + } + + /** + * @dev Hook that is called before any transfer of tokens. This includes + * minting and burning. + * + * Calling conditions: + * + * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens + * will be to transferred to `to`. + * - when `from` is zero, `amount` tokens will be minted for `to`. + * - when `to` is zero, `amount` of ``from``'s tokens will be burned. + * - `from` and `to` are never both zero. + * + * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. + */ + function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual { } +} + +// File: contracts/root/RootToken/IMintableERC20.sol + +pragma solidity 0.6.6; + +interface IMintableERC20 is IERC20 { + /** + * @notice called by predicate contract to mint tokens while withdrawing + * @dev Should be callable only by MintableERC20Predicate + * Make sure minting is done only by this function + * @param user user address for whom token is being minted + * @param amount amount of token being minted + */ + function mint(address user, uint256 amount) external; +} + +// File: contracts/common/Initializable.sol + +pragma solidity 0.6.6; + +contract Initializable { + bool inited = false; + + modifier initializer() { + require(!inited, "already inited"); + _; + inited = true; + } +} + +// File: contracts/common/EIP712Base.sol + +pragma solidity 0.6.6; + + +contract EIP712Base is Initializable { + struct EIP712Domain { + string name; + string version; + address verifyingContract; + bytes32 salt; + } + + string constant public ERC712_VERSION = "1"; + + bytes32 internal constant EIP712_DOMAIN_TYPEHASH = keccak256( + bytes( + "EIP712Domain(string name,string version,address verifyingContract,bytes32 salt)" + ) + ); + bytes32 internal domainSeperator; + + // supposed to be called once while initializing. + // one of the contractsa that inherits this contract follows proxy pattern + // so it is not possible to do this in a constructor + function _initializeEIP712( + string memory name + ) + internal + initializer + { + _setDomainSeperator(name); + } + + function _setDomainSeperator(string memory name) internal { + domainSeperator = keccak256( + abi.encode( + EIP712_DOMAIN_TYPEHASH, + keccak256(bytes(name)), + keccak256(bytes(ERC712_VERSION)), + address(this), + bytes32(getChainId()) + ) + ); + } + + function getDomainSeperator() public view returns (bytes32) { + return domainSeperator; + } + + function getChainId() public pure returns (uint256) { + uint256 id; + assembly { + id := chainid() + } + return id; + } + + /** + * Accept message hash and returns hash message in EIP712 compatible form + * So that it can be used to recover signer from signature signed using EIP712 formatted data + * https://eips.ethereum.org/EIPS/eip-712 + * "\\x19" makes the encoding deterministic + * "\\x01" is the version byte to make it compatible to EIP-191 + */ + function toTypedMessageHash(bytes32 messageHash) + internal + view + returns (bytes32) + { + return + keccak256( + abi.encodePacked("\x19\x01", getDomainSeperator(), messageHash) + ); + } +} + +// File: contracts/common/NativeMetaTransaction.sol + +pragma solidity 0.6.6; + + + +contract NativeMetaTransaction is EIP712Base { + using SafeMath for uint256; + bytes32 private constant META_TRANSACTION_TYPEHASH = keccak256( + bytes( + "MetaTransaction(uint256 nonce,address from,bytes functionSignature)" + ) + ); + event MetaTransactionExecuted( + address userAddress, + address payable relayerAddress, + bytes functionSignature + ); + mapping(address => uint256) nonces; + + /* + * Meta transaction structure. + * No point of including value field here as if user is doing value transfer then he has the funds to pay for gas + * He should call the desired function directly in that case. + */ + struct MetaTransaction { + uint256 nonce; + address from; + bytes functionSignature; + } + + function executeMetaTransaction( + address userAddress, + bytes memory functionSignature, + bytes32 sigR, + bytes32 sigS, + uint8 sigV + ) public payable returns (bytes memory) { + MetaTransaction memory metaTx = MetaTransaction({ + nonce: nonces[userAddress], + from: userAddress, + functionSignature: functionSignature + }); + + require( + verify(userAddress, metaTx, sigR, sigS, sigV), + "Signer and signature do not match" + ); + + // increase nonce for user (to avoid re-use) + nonces[userAddress] = nonces[userAddress].add(1); + + emit MetaTransactionExecuted( + userAddress, + msg.sender, + functionSignature + ); + + // Append userAddress and relayer address at the end to extract it from calling context + (bool success, bytes memory returnData) = address(this).call( + abi.encodePacked(functionSignature, userAddress) + ); + require(success, "Function call not successful"); + + return returnData; + } + + function hashMetaTransaction(MetaTransaction memory metaTx) + internal + pure + returns (bytes32) + { + return + keccak256( + abi.encode( + META_TRANSACTION_TYPEHASH, + metaTx.nonce, + metaTx.from, + keccak256(metaTx.functionSignature) + ) + ); + } + + function getNonce(address user) public view returns (uint256 nonce) { + nonce = nonces[user]; + } + + function verify( + address signer, + MetaTransaction memory metaTx, + bytes32 sigR, + bytes32 sigS, + uint8 sigV + ) internal view returns (bool) { + require(signer != address(0), "NativeMetaTransaction: INVALID_SIGNER"); + return + signer == + ecrecover( + toTypedMessageHash(hashMetaTransaction(metaTx)), + sigV, + sigR, + sigS + ); + } +} + +// File: contracts/common/ContextMixin.sol + +pragma solidity 0.6.6; + +abstract contract ContextMixin { + function msgSender() + internal + view + returns (address payable sender) + { + if (msg.sender == address(this)) { + bytes memory array = msg.data; + uint256 index = msg.data.length; + assembly { + // Load the 32 bytes word from memory with the address on the lower 20 bytes, and mask those. + sender := and( + mload(add(array, index)), + 0xffffffffffffffffffffffffffffffffffffffff + ) + } + } else { + sender = msg.sender; + } + return sender; + } +} + +// File: @openzeppelin/contracts/utils/EnumerableSet.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Library for managing + * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive + * types. + * + * Sets have the following properties: + * + * - Elements are added, removed, and checked for existence in constant time + * (O(1)). + * - Elements are enumerated in O(n). No guarantees are made on the ordering. + * + * ``` + * contract Example { + * // Add the library methods + * using EnumerableSet for EnumerableSet.AddressSet; + * + * // Declare a set state variable + * EnumerableSet.AddressSet private mySet; + * } + * ``` + * + * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256` + * (`UintSet`) are supported. + */ +library EnumerableSet { + // To implement this library for multiple types with as little code + // repetition as possible, we write it in terms of a generic Set type with + // bytes32 values. + // The Set implementation uses private functions, and user-facing + // implementations (such as AddressSet) are just wrappers around the + // underlying Set. + // This means that we can only create new EnumerableSets for types that fit + // in bytes32. + + struct Set { + // Storage of set values + bytes32[] _values; + + // Position of the value in the `values` array, plus 1 because index 0 + // means a value is not in the set. + mapping (bytes32 => uint256) _indexes; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function _add(Set storage set, bytes32 value) private returns (bool) { + if (!_contains(set, value)) { + set._values.push(value); + // The value is stored at length-1, but we add 1 to all indexes + // and use 0 as a sentinel value + set._indexes[value] = set._values.length; + return true; + } else { + return false; + } + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function _remove(Set storage set, bytes32 value) private returns (bool) { + // We read and store the value's index to prevent multiple reads from the same storage slot + uint256 valueIndex = set._indexes[value]; + + if (valueIndex != 0) { // Equivalent to contains(set, value) + // To delete an element from the _values array in O(1), we swap the element to delete with the last one in + // the array, and then remove the last element (sometimes called as 'swap and pop'). + // This modifies the order of the array, as noted in {at}. + + uint256 toDeleteIndex = valueIndex - 1; + uint256 lastIndex = set._values.length - 1; + + // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs + // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. + + bytes32 lastvalue = set._values[lastIndex]; + + // Move the last value to the index where the value to delete is + set._values[toDeleteIndex] = lastvalue; + // Update the index for the moved value + set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based + + // Delete the slot where the moved value was stored + set._values.pop(); + + // Delete the index for the deleted slot + delete set._indexes[value]; + + return true; + } else { + return false; + } + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function _contains(Set storage set, bytes32 value) private view returns (bool) { + return set._indexes[value] != 0; + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function _length(Set storage set) private view returns (uint256) { + return set._values.length; + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function _at(Set storage set, uint256 index) private view returns (bytes32) { + require(set._values.length > index, "EnumerableSet: index out of bounds"); + return set._values[index]; + } + + // AddressSet + + struct AddressSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(AddressSet storage set, address value) internal returns (bool) { + return _add(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(AddressSet storage set, address value) internal returns (bool) { + return _remove(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(AddressSet storage set, address value) internal view returns (bool) { + return _contains(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns the number of values in the set. O(1). + */ + function length(AddressSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(AddressSet storage set, uint256 index) internal view returns (address) { + return address(uint256(_at(set._inner, index))); + } + + + // UintSet + + struct UintSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(UintSet storage set, uint256 value) internal returns (bool) { + return _add(set._inner, bytes32(value)); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(UintSet storage set, uint256 value) internal returns (bool) { + return _remove(set._inner, bytes32(value)); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(UintSet storage set, uint256 value) internal view returns (bool) { + return _contains(set._inner, bytes32(value)); + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function length(UintSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(UintSet storage set, uint256 index) internal view returns (uint256) { + return uint256(_at(set._inner, index)); + } +} + +// File: @openzeppelin/contracts/access/AccessControl.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + +/** + * @dev Contract module that allows children to implement role-based access + * control mechanisms. + * + * Roles are referred to by their `bytes32` identifier. These should be exposed + * in the external API and be unique. The best way to achieve this is by + * using `public constant` hash digests: + * + * ``` + * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); + * ``` + * + * Roles can be used to represent a set of permissions. To restrict access to a + * function call, use {hasRole}: + * + * ``` + * function foo() public { + * require(hasRole(MY_ROLE, msg.sender)); + * ... + * } + * ``` + * + * Roles can be granted and revoked dynamically via the {grantRole} and + * {revokeRole} functions. Each role has an associated admin role, and only + * accounts that have a role's admin role can call {grantRole} and {revokeRole}. + * + * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means + * that only accounts with this role will be able to grant or revoke other + * roles. More complex role relationships can be created by using + * {_setRoleAdmin}. + * + * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to + * grant and revoke this role. Extra precautions should be taken to secure + * accounts that have been granted it. + */ +abstract contract AccessControl is Context { + using EnumerableSet for EnumerableSet.AddressSet; + using Address for address; + + struct RoleData { + EnumerableSet.AddressSet members; + bytes32 adminRole; + } + + mapping (bytes32 => RoleData) private _roles; + + bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; + + /** + * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` + * + * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite + * {RoleAdminChanged} not being emitted signaling this. + * + * _Available since v3.1._ + */ + event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); + + /** + * @dev Emitted when `account` is granted `role`. + * + * `sender` is the account that originated the contract call, an admin role + * bearer except when using {_setupRole}. + */ + event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Emitted when `account` is revoked `role`. + * + * `sender` is the account that originated the contract call: + * - if using `revokeRole`, it is the admin role bearer + * - if using `renounceRole`, it is the role bearer (i.e. `account`) + */ + event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Returns `true` if `account` has been granted `role`. + */ + function hasRole(bytes32 role, address account) public view returns (bool) { + return _roles[role].members.contains(account); + } + + /** + * @dev Returns the number of accounts that have `role`. Can be used + * together with {getRoleMember} to enumerate all bearers of a role. + */ + function getRoleMemberCount(bytes32 role) public view returns (uint256) { + return _roles[role].members.length(); + } + + /** + * @dev Returns one of the accounts that have `role`. `index` must be a + * value between 0 and {getRoleMemberCount}, non-inclusive. + * + * Role bearers are not sorted in any particular way, and their ordering may + * change at any point. + * + * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure + * you perform all queries on the same block. See the following + * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] + * for more information. + */ + function getRoleMember(bytes32 role, uint256 index) public view returns (address) { + return _roles[role].members.at(index); + } + + /** + * @dev Returns the admin role that controls `role`. See {grantRole} and + * {revokeRole}. + * + * To change a role's admin, use {_setRoleAdmin}. + */ + function getRoleAdmin(bytes32 role) public view returns (bytes32) { + return _roles[role].adminRole; + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function grantRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); + + _grantRole(role, account); + } + + /** + * @dev Revokes `role` from `account`. + * + * If `account` had been granted `role`, emits a {RoleRevoked} event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function revokeRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); + + _revokeRole(role, account); + } + + /** + * @dev Revokes `role` from the calling account. + * + * Roles are often managed via {grantRole} and {revokeRole}: this function's + * purpose is to provide a mechanism for accounts to lose their privileges + * if they are compromised (such as when a trusted device is misplaced). + * + * If the calling account had been granted `role`, emits a {RoleRevoked} + * event. + * + * Requirements: + * + * - the caller must be `account`. + */ + function renounceRole(bytes32 role, address account) public virtual { + require(account == _msgSender(), "AccessControl: can only renounce roles for self"); + + _revokeRole(role, account); + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. Note that unlike {grantRole}, this function doesn't perform any + * checks on the calling account. + * + * [WARNING] + * ==== + * This function should only be called from the constructor when setting + * up the initial roles for the system. + * + * Using this function in any other way is effectively circumventing the admin + * system imposed by {AccessControl}. + * ==== + */ + function _setupRole(bytes32 role, address account) internal virtual { + _grantRole(role, account); + } + + /** + * @dev Sets `adminRole` as ``role``'s admin role. + * + * Emits a {RoleAdminChanged} event. + */ + function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { + emit RoleAdminChanged(role, _roles[role].adminRole, adminRole); + _roles[role].adminRole = adminRole; + } + + function _grantRole(bytes32 role, address account) private { + if (_roles[role].members.add(account)) { + emit RoleGranted(role, account, _msgSender()); + } + } + + function _revokeRole(bytes32 role, address account) private { + if (_roles[role].members.remove(account)) { + emit RoleRevoked(role, account, _msgSender()); + } + } +} + +// File: contracts/common/AccessControlMixin.sol + +pragma solidity 0.6.6; + + +contract AccessControlMixin is AccessControl { + string private _revertMsg; + function _setupContractId(string memory contractId) internal { + _revertMsg = string(abi.encodePacked(contractId, ": INSUFFICIENT_PERMISSIONS")); + } + + modifier only(bytes32 role) { + require( + hasRole(role, _msgSender()), + _revertMsg + ); + _; + } +} + +// File: contracts/root/RootToken/DummyMintableERC20.sol + +pragma solidity 0.6.6; + + + + + + +contract DummyMintableERC20 is + ERC20, + AccessControlMixin, + NativeMetaTransaction, + ContextMixin, + IMintableERC20 +{ + bytes32 public constant PREDICATE_ROLE = keccak256("PREDICATE_ROLE"); + + constructor(string memory name_, string memory symbol_) + public + ERC20(name_, symbol_) + { + _setupContractId("DummyMintableERC20"); + _setupRole(DEFAULT_ADMIN_ROLE, _msgSender()); + _setupRole(PREDICATE_ROLE, _msgSender()); + + _mint(_msgSender(), 10**10 * (10**18)); + _initializeEIP712(name_); + } + + /** + * @dev See {IMintableERC20-mint}. + */ + function mint(address user, uint256 amount) external override only(PREDICATE_ROLE) { + _mint(user, amount); + } + + function _msgSender() + internal + override + view + returns (address payable sender) + { + return ContextMixin.msgSender(); + } +} diff --git a/flat/MintableERC1155Predicate.sol b/flat/MintableERC1155Predicate.sol new file mode 100644 index 00000000..5de32399 --- /dev/null +++ b/flat/MintableERC1155Predicate.sol @@ -0,0 +1,1526 @@ + +// File: @openzeppelin/contracts/introspection/IERC165.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Interface of the ERC165 standard, as defined in the + * https://eips.ethereum.org/EIPS/eip-165[EIP]. + * + * Implementers can declare support of contract interfaces, which can then be + * queried by others ({ERC165Checker}). + * + * For an implementation, see {ERC165}. + */ +interface IERC165 { + /** + * @dev Returns true if this contract implements the interface defined by + * `interfaceId`. See the corresponding + * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section] + * to learn more about how these ids are created. + * + * This function call must use less than 30 000 gas. + */ + function supportsInterface(bytes4 interfaceId) external view returns (bool); +} + +// File: @openzeppelin/contracts/token/ERC1155/IERC1155.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + + +/** + * @dev Required interface of an ERC1155 compliant contract, as defined in the + * https://eips.ethereum.org/EIPS/eip-1155[EIP]. + * + * _Available since v3.1._ + */ +interface IERC1155 is IERC165 { + /** + * @dev Emitted when `value` tokens of token type `id` are transfered from `from` to `to` by `operator`. + */ + event TransferSingle(address indexed operator, address indexed from, address indexed to, uint256 id, uint256 value); + + /** + * @dev Equivalent to multiple {TransferSingle} events, where `operator`, `from` and `to` are the same for all + * transfers. + */ + event TransferBatch(address indexed operator, address indexed from, address indexed to, uint256[] ids, uint256[] values); + + /** + * @dev Emitted when `account` grants or revokes permission to `operator` to transfer their tokens, according to + * `approved`. + */ + event ApprovalForAll(address indexed account, address indexed operator, bool approved); + + /** + * @dev Emitted when the URI for token type `id` changes to `value`, if it is a non-programmatic URI. + * + * If an {URI} event was emitted for `id`, the standard + * https://eips.ethereum.org/EIPS/eip-1155#metadata-extensions[guarantees] that `value` will equal the value + * returned by {IERC1155MetadataURI-uri}. + */ + event URI(string value, uint256 indexed id); + + /** + * @dev Returns the amount of tokens of token type `id` owned by `account`. + * + * Requirements: + * + * - `account` cannot be the zero address. + */ + function balanceOf(address account, uint256 id) external view returns (uint256); + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {balanceOf}. + * + * Requirements: + * + * - `accounts` and `ids` must have the same length. + */ + function balanceOfBatch(address[] calldata accounts, uint256[] calldata ids) external view returns (uint256[] memory); + + /** + * @dev Grants or revokes permission to `operator` to transfer the caller's tokens, according to `approved`, + * + * Emits an {ApprovalForAll} event. + * + * Requirements: + * + * - `operator` cannot be the caller. + */ + function setApprovalForAll(address operator, bool approved) external; + + /** + * @dev Returns true if `operator` is approved to transfer ``account``'s tokens. + * + * See {setApprovalForAll}. + */ + function isApprovedForAll(address account, address operator) external view returns (bool); + + /** + * @dev Transfers `amount` tokens of token type `id` from `from` to `to`. + * + * Emits a {TransferSingle} event. + * + * Requirements: + * + * - `to` cannot be the zero address. + * - If the caller is not `from`, it must be have been approved to spend ``from``'s tokens via {setApprovalForAll}. + * - `from` must have a balance of tokens of type `id` of at least `amount`. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155Received} and return the + * acceptance magic value. + */ + function safeTransferFrom(address from, address to, uint256 id, uint256 amount, bytes calldata data) external; + + /** + * @dev xref:ROOT:erc1155.adoc#batch-operations[Batched] version of {safeTransferFrom}. + * + * Emits a {TransferBatch} event. + * + * Requirements: + * + * - `ids` and `amounts` must have the same length. + * - If `to` refers to a smart contract, it must implement {IERC1155Receiver-onERC1155BatchReceived} and return the + * acceptance magic value. + */ + function safeBatchTransferFrom(address from, address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external; +} + +// File: contracts/root/RootToken/IMintableERC1155.sol + +pragma solidity 0.6.6; + +interface IMintableERC1155 is IERC1155 { + /** + * @notice Creates `amount` tokens of token type `id`, and assigns them to `account`. + * @dev Should be callable only by MintableERC1155Predicate + * Make sure minting is done only by this function + * @param account user address for whom token is being minted + * @param id token which is being minted + * @param amount amount of token being minted + * @param data extra byte data to be accompanied with minted tokens + */ + function mint(address account, uint256 id, uint256 amount, bytes calldata data) external; + + /** + * @notice Batched version of singular token minting, where + * for each token in `ids` respective amount to be minted from `amounts` + * array, for address `to`. + * @dev Should be callable only by MintableERC1155Predicate + * Make sure minting is done only by this function + * @param to user address for whom token is being minted + * @param ids tokens which are being minted + * @param amounts amount of each token being minted + * @param data extra byte data to be accompanied with minted tokens + */ + function mintBatch(address to, uint256[] calldata ids, uint256[] calldata amounts, bytes calldata data) external; +} + +// File: @openzeppelin/contracts/token/ERC1155/IERC1155Receiver.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + +/** + * _Available since v3.1._ + */ +interface IERC1155Receiver is IERC165 { + + /** + @dev Handles the receipt of a single ERC1155 token type. This function is + called at the end of a `safeTransferFrom` after the balance has been updated. + To accept the transfer, this must return + `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` + (i.e. 0xf23a6e61, or its own function selector). + @param operator The address which initiated the transfer (i.e. msg.sender) + @param from The address which previously owned the token + @param id The ID of the token being transferred + @param value The amount of tokens being transferred + @param data Additional data with no specified format + @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` if transfer is allowed + */ + function onERC1155Received( + address operator, + address from, + uint256 id, + uint256 value, + bytes calldata data + ) + external + returns(bytes4); + + /** + @dev Handles the receipt of a multiple ERC1155 token types. This function + is called at the end of a `safeBatchTransferFrom` after the balances have + been updated. To accept the transfer(s), this must return + `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` + (i.e. 0xbc197c81, or its own function selector). + @param operator The address which initiated the batch transfer (i.e. msg.sender) + @param from The address which previously owned the token + @param ids An array containing ids of each token being transferred (order and length must match values array) + @param values An array containing amounts of each token being transferred (order and length must match ids array) + @param data Additional data with no specified format + @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` if transfer is allowed + */ + function onERC1155BatchReceived( + address operator, + address from, + uint256[] calldata ids, + uint256[] calldata values, + bytes calldata data + ) + external + returns(bytes4); +} + +// File: @openzeppelin/contracts/introspection/ERC165.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + +/** + * @dev Implementation of the {IERC165} interface. + * + * Contracts may inherit from this and call {_registerInterface} to declare + * their support of an interface. + */ +contract ERC165 is IERC165 { + /* + * bytes4(keccak256('supportsInterface(bytes4)')) == 0x01ffc9a7 + */ + bytes4 private constant _INTERFACE_ID_ERC165 = 0x01ffc9a7; + + /** + * @dev Mapping of interface ids to whether or not it's supported. + */ + mapping(bytes4 => bool) private _supportedInterfaces; + + constructor () internal { + // Derived contracts need only register support for their own interfaces, + // we register support for ERC165 itself here + _registerInterface(_INTERFACE_ID_ERC165); + } + + /** + * @dev See {IERC165-supportsInterface}. + * + * Time complexity O(1), guaranteed to always use less than 30 000 gas. + */ + function supportsInterface(bytes4 interfaceId) public view override returns (bool) { + return _supportedInterfaces[interfaceId]; + } + + /** + * @dev Registers the contract as an implementer of the interface defined by + * `interfaceId`. Support of the actual ERC165 interface is automatic and + * registering its interface id is not required. + * + * See {IERC165-supportsInterface}. + * + * Requirements: + * + * - `interfaceId` cannot be the ERC165 invalid interface (`0xffffffff`). + */ + function _registerInterface(bytes4 interfaceId) internal virtual { + require(interfaceId != 0xffffffff, "ERC165: invalid interface id"); + _supportedInterfaces[interfaceId] = true; + } +} + +// File: @openzeppelin/contracts/token/ERC1155/ERC1155Receiver.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + +/** + * @dev _Available since v3.1._ + */ +abstract contract ERC1155Receiver is ERC165, IERC1155Receiver { + constructor() public { + _registerInterface( + ERC1155Receiver(0).onERC1155Received.selector ^ + ERC1155Receiver(0).onERC1155BatchReceived.selector + ); + } +} + +// File: @openzeppelin/contracts/utils/EnumerableSet.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Library for managing + * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive + * types. + * + * Sets have the following properties: + * + * - Elements are added, removed, and checked for existence in constant time + * (O(1)). + * - Elements are enumerated in O(n). No guarantees are made on the ordering. + * + * ``` + * contract Example { + * // Add the library methods + * using EnumerableSet for EnumerableSet.AddressSet; + * + * // Declare a set state variable + * EnumerableSet.AddressSet private mySet; + * } + * ``` + * + * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256` + * (`UintSet`) are supported. + */ +library EnumerableSet { + // To implement this library for multiple types with as little code + // repetition as possible, we write it in terms of a generic Set type with + // bytes32 values. + // The Set implementation uses private functions, and user-facing + // implementations (such as AddressSet) are just wrappers around the + // underlying Set. + // This means that we can only create new EnumerableSets for types that fit + // in bytes32. + + struct Set { + // Storage of set values + bytes32[] _values; + + // Position of the value in the `values` array, plus 1 because index 0 + // means a value is not in the set. + mapping (bytes32 => uint256) _indexes; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function _add(Set storage set, bytes32 value) private returns (bool) { + if (!_contains(set, value)) { + set._values.push(value); + // The value is stored at length-1, but we add 1 to all indexes + // and use 0 as a sentinel value + set._indexes[value] = set._values.length; + return true; + } else { + return false; + } + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function _remove(Set storage set, bytes32 value) private returns (bool) { + // We read and store the value's index to prevent multiple reads from the same storage slot + uint256 valueIndex = set._indexes[value]; + + if (valueIndex != 0) { // Equivalent to contains(set, value) + // To delete an element from the _values array in O(1), we swap the element to delete with the last one in + // the array, and then remove the last element (sometimes called as 'swap and pop'). + // This modifies the order of the array, as noted in {at}. + + uint256 toDeleteIndex = valueIndex - 1; + uint256 lastIndex = set._values.length - 1; + + // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs + // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. + + bytes32 lastvalue = set._values[lastIndex]; + + // Move the last value to the index where the value to delete is + set._values[toDeleteIndex] = lastvalue; + // Update the index for the moved value + set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based + + // Delete the slot where the moved value was stored + set._values.pop(); + + // Delete the index for the deleted slot + delete set._indexes[value]; + + return true; + } else { + return false; + } + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function _contains(Set storage set, bytes32 value) private view returns (bool) { + return set._indexes[value] != 0; + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function _length(Set storage set) private view returns (uint256) { + return set._values.length; + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function _at(Set storage set, uint256 index) private view returns (bytes32) { + require(set._values.length > index, "EnumerableSet: index out of bounds"); + return set._values[index]; + } + + // AddressSet + + struct AddressSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(AddressSet storage set, address value) internal returns (bool) { + return _add(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(AddressSet storage set, address value) internal returns (bool) { + return _remove(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(AddressSet storage set, address value) internal view returns (bool) { + return _contains(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns the number of values in the set. O(1). + */ + function length(AddressSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(AddressSet storage set, uint256 index) internal view returns (address) { + return address(uint256(_at(set._inner, index))); + } + + + // UintSet + + struct UintSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(UintSet storage set, uint256 value) internal returns (bool) { + return _add(set._inner, bytes32(value)); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(UintSet storage set, uint256 value) internal returns (bool) { + return _remove(set._inner, bytes32(value)); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(UintSet storage set, uint256 value) internal view returns (bool) { + return _contains(set._inner, bytes32(value)); + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function length(UintSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(UintSet storage set, uint256 index) internal view returns (uint256) { + return uint256(_at(set._inner, index)); + } +} + +// File: @openzeppelin/contracts/utils/Address.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + +/** + * @dev Collection of functions related to the address type + */ +library Address { + /** + * @dev Returns true if `account` is a contract. + * + * [IMPORTANT] + * ==== + * It is unsafe to assume that an address for which this function returns + * false is an externally-owned account (EOA) and not a contract. + * + * Among others, `isContract` will return false for the following + * types of addresses: + * + * - an externally-owned account + * - a contract in construction + * - an address where a contract will be created + * - an address where a contract lived, but was destroyed + * ==== + */ + function isContract(address account) internal view returns (bool) { + // According to EIP-1052, 0x0 is the value returned for not-yet created accounts + // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned + // for accounts without code, i.e. `keccak256('')` + bytes32 codehash; + bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; + // solhint-disable-next-line no-inline-assembly + assembly { codehash := extcodehash(account) } + return (codehash != accountHash && codehash != 0x0); + } + + /** + * @dev Replacement for Solidity's `transfer`: sends `amount` wei to + * `recipient`, forwarding all available gas and reverting on errors. + * + * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost + * of certain opcodes, possibly making contracts go over the 2300 gas limit + * imposed by `transfer`, making them unable to receive funds via + * `transfer`. {sendValue} removes this limitation. + * + * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. + * + * IMPORTANT: because control is transferred to `recipient`, care must be + * taken to not create reentrancy vulnerabilities. Consider using + * {ReentrancyGuard} or the + * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. + */ + function sendValue(address payable recipient, uint256 amount) internal { + require(address(this).balance >= amount, "Address: insufficient balance"); + + // solhint-disable-next-line avoid-low-level-calls, avoid-call-value + (bool success, ) = recipient.call{ value: amount }(""); + require(success, "Address: unable to send value, recipient may have reverted"); + } + + /** + * @dev Performs a Solidity function call using a low level `call`. A + * plain`call` is an unsafe replacement for a function call: use this + * function instead. + * + * If `target` reverts with a revert reason, it is bubbled up by this + * function (like regular Solidity function calls). + * + * Returns the raw returned data. To convert to the expected return value, + * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. + * + * Requirements: + * + * - `target` must be a contract. + * - calling `target` with `data` must not revert. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data) internal returns (bytes memory) { + return functionCall(target, data, "Address: low-level call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with + * `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { + return _functionCallWithValue(target, data, 0, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but also transferring `value` wei to `target`. + * + * Requirements: + * + * - the calling contract must have an ETH balance of at least `value`. + * - the called Solidity function must be `payable`. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { + return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); + } + + /** + * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but + * with `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { + require(address(this).balance >= value, "Address: insufficient balance for call"); + return _functionCallWithValue(target, data, value, errorMessage); + } + + function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { + require(isContract(target), "Address: call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); + if (success) { + return returndata; + } else { + // Look for revert reason and bubble it up if present + if (returndata.length > 0) { + // The easiest way to bubble the revert reason is using memory via assembly + + // solhint-disable-next-line no-inline-assembly + assembly { + let returndata_size := mload(returndata) + revert(add(32, returndata), returndata_size) + } + } else { + revert(errorMessage); + } + } + } +} + +// File: @openzeppelin/contracts/GSN/Context.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/* + * @dev Provides information about the current execution context, including the + * sender of the transaction and its data. While these are generally available + * via msg.sender and msg.data, they should not be accessed in such a direct + * manner, since when dealing with GSN meta-transactions the account sending and + * paying for execution may not be the actual sender (as far as an application + * is concerned). + * + * This contract is only required for intermediate, library-like contracts. + */ +abstract contract Context { + function _msgSender() internal view virtual returns (address payable) { + return msg.sender; + } + + function _msgData() internal view virtual returns (bytes memory) { + this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 + return msg.data; + } +} + +// File: @openzeppelin/contracts/access/AccessControl.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + +/** + * @dev Contract module that allows children to implement role-based access + * control mechanisms. + * + * Roles are referred to by their `bytes32` identifier. These should be exposed + * in the external API and be unique. The best way to achieve this is by + * using `public constant` hash digests: + * + * ``` + * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); + * ``` + * + * Roles can be used to represent a set of permissions. To restrict access to a + * function call, use {hasRole}: + * + * ``` + * function foo() public { + * require(hasRole(MY_ROLE, msg.sender)); + * ... + * } + * ``` + * + * Roles can be granted and revoked dynamically via the {grantRole} and + * {revokeRole} functions. Each role has an associated admin role, and only + * accounts that have a role's admin role can call {grantRole} and {revokeRole}. + * + * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means + * that only accounts with this role will be able to grant or revoke other + * roles. More complex role relationships can be created by using + * {_setRoleAdmin}. + * + * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to + * grant and revoke this role. Extra precautions should be taken to secure + * accounts that have been granted it. + */ +abstract contract AccessControl is Context { + using EnumerableSet for EnumerableSet.AddressSet; + using Address for address; + + struct RoleData { + EnumerableSet.AddressSet members; + bytes32 adminRole; + } + + mapping (bytes32 => RoleData) private _roles; + + bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; + + /** + * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` + * + * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite + * {RoleAdminChanged} not being emitted signaling this. + * + * _Available since v3.1._ + */ + event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); + + /** + * @dev Emitted when `account` is granted `role`. + * + * `sender` is the account that originated the contract call, an admin role + * bearer except when using {_setupRole}. + */ + event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Emitted when `account` is revoked `role`. + * + * `sender` is the account that originated the contract call: + * - if using `revokeRole`, it is the admin role bearer + * - if using `renounceRole`, it is the role bearer (i.e. `account`) + */ + event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Returns `true` if `account` has been granted `role`. + */ + function hasRole(bytes32 role, address account) public view returns (bool) { + return _roles[role].members.contains(account); + } + + /** + * @dev Returns the number of accounts that have `role`. Can be used + * together with {getRoleMember} to enumerate all bearers of a role. + */ + function getRoleMemberCount(bytes32 role) public view returns (uint256) { + return _roles[role].members.length(); + } + + /** + * @dev Returns one of the accounts that have `role`. `index` must be a + * value between 0 and {getRoleMemberCount}, non-inclusive. + * + * Role bearers are not sorted in any particular way, and their ordering may + * change at any point. + * + * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure + * you perform all queries on the same block. See the following + * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] + * for more information. + */ + function getRoleMember(bytes32 role, uint256 index) public view returns (address) { + return _roles[role].members.at(index); + } + + /** + * @dev Returns the admin role that controls `role`. See {grantRole} and + * {revokeRole}. + * + * To change a role's admin, use {_setRoleAdmin}. + */ + function getRoleAdmin(bytes32 role) public view returns (bytes32) { + return _roles[role].adminRole; + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function grantRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); + + _grantRole(role, account); + } + + /** + * @dev Revokes `role` from `account`. + * + * If `account` had been granted `role`, emits a {RoleRevoked} event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function revokeRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); + + _revokeRole(role, account); + } + + /** + * @dev Revokes `role` from the calling account. + * + * Roles are often managed via {grantRole} and {revokeRole}: this function's + * purpose is to provide a mechanism for accounts to lose their privileges + * if they are compromised (such as when a trusted device is misplaced). + * + * If the calling account had been granted `role`, emits a {RoleRevoked} + * event. + * + * Requirements: + * + * - the caller must be `account`. + */ + function renounceRole(bytes32 role, address account) public virtual { + require(account == _msgSender(), "AccessControl: can only renounce roles for self"); + + _revokeRole(role, account); + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. Note that unlike {grantRole}, this function doesn't perform any + * checks on the calling account. + * + * [WARNING] + * ==== + * This function should only be called from the constructor when setting + * up the initial roles for the system. + * + * Using this function in any other way is effectively circumventing the admin + * system imposed by {AccessControl}. + * ==== + */ + function _setupRole(bytes32 role, address account) internal virtual { + _grantRole(role, account); + } + + /** + * @dev Sets `adminRole` as ``role``'s admin role. + * + * Emits a {RoleAdminChanged} event. + */ + function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { + emit RoleAdminChanged(role, _roles[role].adminRole, adminRole); + _roles[role].adminRole = adminRole; + } + + function _grantRole(bytes32 role, address account) private { + if (_roles[role].members.add(account)) { + emit RoleGranted(role, account, _msgSender()); + } + } + + function _revokeRole(bytes32 role, address account) private { + if (_roles[role].members.remove(account)) { + emit RoleRevoked(role, account, _msgSender()); + } + } +} + +// File: contracts/common/AccessControlMixin.sol + +pragma solidity 0.6.6; + + +contract AccessControlMixin is AccessControl { + string private _revertMsg; + function _setupContractId(string memory contractId) internal { + _revertMsg = string(abi.encodePacked(contractId, ": INSUFFICIENT_PERMISSIONS")); + } + + modifier only(bytes32 role) { + require( + hasRole(role, _msgSender()), + _revertMsg + ); + _; + } +} + +// File: contracts/lib/RLPReader.sol + +/* + * @author Hamdi Allam hamdi.allam97@gmail.com + * Please reach out with any questions or concerns + * https://github.com/hamdiallam/Solidity-RLP/blob/e681e25a376dbd5426b509380bc03446f05d0f97/contracts/RLPReader.sol + */ +pragma solidity 0.6.6; + +library RLPReader { + uint8 constant STRING_SHORT_START = 0x80; + uint8 constant STRING_LONG_START = 0xb8; + uint8 constant LIST_SHORT_START = 0xc0; + uint8 constant LIST_LONG_START = 0xf8; + uint8 constant WORD_SIZE = 32; + + struct RLPItem { + uint256 len; + uint256 memPtr; + } + + /* + * @param item RLP encoded bytes + */ + function toRlpItem(bytes memory item) + internal + pure + returns (RLPItem memory) + { + require(item.length > 0, "RLPReader: INVALID_BYTES_LENGTH"); + uint256 memPtr; + assembly { + memPtr := add(item, 0x20) + } + + return RLPItem(item.length, memPtr); + } + + /* + * @param item RLP encoded list in bytes + */ + function toList(RLPItem memory item) + internal + pure + returns (RLPItem[] memory) + { + require(isList(item), "RLPReader: ITEM_NOT_LIST"); + + uint256 items = numItems(item); + RLPItem[] memory result = new RLPItem[](items); + uint256 listLength = _itemLength(item.memPtr); + require(listLength == item.len, "RLPReader: LIST_DECODED_LENGTH_MISMATCH"); + + uint256 memPtr = item.memPtr + _payloadOffset(item.memPtr); + uint256 dataLen; + for (uint256 i = 0; i < items; i++) { + dataLen = _itemLength(memPtr); + result[i] = RLPItem(dataLen, memPtr); + memPtr = memPtr + dataLen; + } + + return result; + } + + // @return indicator whether encoded payload is a list. negate this function call for isData. + function isList(RLPItem memory item) internal pure returns (bool) { + uint8 byte0; + uint256 memPtr = item.memPtr; + assembly { + byte0 := byte(0, mload(memPtr)) + } + + if (byte0 < LIST_SHORT_START) return false; + return true; + } + + /** RLPItem conversions into data types **/ + + // @returns raw rlp encoding in bytes + function toRlpBytes(RLPItem memory item) + internal + pure + returns (bytes memory) + { + bytes memory result = new bytes(item.len); + + uint256 ptr; + assembly { + ptr := add(0x20, result) + } + + copy(item.memPtr, ptr, item.len); + return result; + } + + function toAddress(RLPItem memory item) internal pure returns (address) { + require(!isList(item), "RLPReader: DECODING_LIST_AS_ADDRESS"); + // 1 byte for the length prefix + require(item.len == 21, "RLPReader: INVALID_ADDRESS_LENGTH"); + + return address(toUint(item)); + } + + function toUint(RLPItem memory item) internal pure returns (uint256) { + require(!isList(item), "RLPReader: DECODING_LIST_AS_UINT"); + require(item.len <= 33, "RLPReader: INVALID_UINT_LENGTH"); + + uint256 itemLength = _itemLength(item.memPtr); + require(itemLength == item.len, "RLPReader: UINT_DECODED_LENGTH_MISMATCH"); + + uint256 offset = _payloadOffset(item.memPtr); + uint256 len = item.len - offset; + uint256 result; + uint256 memPtr = item.memPtr + offset; + assembly { + result := mload(memPtr) + + // shfit to the correct location if neccesary + if lt(len, 32) { + result := div(result, exp(256, sub(32, len))) + } + } + + return result; + } + + // enforces 32 byte length + function toUintStrict(RLPItem memory item) internal pure returns (uint256) { + uint256 itemLength = _itemLength(item.memPtr); + require(itemLength == item.len, "RLPReader: UINT_STRICT_DECODED_LENGTH_MISMATCH"); + // one byte prefix + require(item.len == 33, "RLPReader: INVALID_UINT_STRICT_LENGTH"); + + uint256 result; + uint256 memPtr = item.memPtr + 1; + assembly { + result := mload(memPtr) + } + + return result; + } + + function toBytes(RLPItem memory item) internal pure returns (bytes memory) { + uint256 listLength = _itemLength(item.memPtr); + require(listLength == item.len, "RLPReader: BYTES_DECODED_LENGTH_MISMATCH"); + uint256 offset = _payloadOffset(item.memPtr); + + uint256 len = item.len - offset; // data length + bytes memory result = new bytes(len); + + uint256 destPtr; + assembly { + destPtr := add(0x20, result) + } + + copy(item.memPtr + offset, destPtr, len); + return result; + } + + /* + * Private Helpers + */ + + // @return number of payload items inside an encoded list. + function numItems(RLPItem memory item) private pure returns (uint256) { + // add `isList` check if `item` is expected to be passsed without a check from calling function + // require(isList(item), "RLPReader: NUM_ITEMS_NOT_LIST"); + + uint256 count = 0; + uint256 currPtr = item.memPtr + _payloadOffset(item.memPtr); + uint256 endPtr = item.memPtr + item.len; + while (currPtr < endPtr) { + currPtr = currPtr + _itemLength(currPtr); // skip over an item + require(currPtr <= endPtr, "RLPReader: NUM_ITEMS_DECODED_LENGTH_MISMATCH"); + count++; + } + + return count; + } + + // @return entire rlp item byte length + function _itemLength(uint256 memPtr) private pure returns (uint256) { + uint256 itemLen; + uint256 byte0; + assembly { + byte0 := byte(0, mload(memPtr)) + } + + if (byte0 < STRING_SHORT_START) itemLen = 1; + else if (byte0 < STRING_LONG_START) + itemLen = byte0 - STRING_SHORT_START + 1; + else if (byte0 < LIST_SHORT_START) { + assembly { + let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is + memPtr := add(memPtr, 1) // skip over the first byte + + /* 32 byte word size */ + let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len + itemLen := add(dataLen, add(byteLen, 1)) + } + } else if (byte0 < LIST_LONG_START) { + itemLen = byte0 - LIST_SHORT_START + 1; + } else { + assembly { + let byteLen := sub(byte0, 0xf7) + memPtr := add(memPtr, 1) + + let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length + itemLen := add(dataLen, add(byteLen, 1)) + } + } + + return itemLen; + } + + // @return number of bytes until the data + function _payloadOffset(uint256 memPtr) private pure returns (uint256) { + uint256 byte0; + assembly { + byte0 := byte(0, mload(memPtr)) + } + + if (byte0 < STRING_SHORT_START) return 0; + else if ( + byte0 < STRING_LONG_START || + (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START) + ) return 1; + else if (byte0 < LIST_SHORT_START) + // being explicit + return byte0 - (STRING_LONG_START - 1) + 1; + else return byte0 - (LIST_LONG_START - 1) + 1; + } + + /* + * @param src Pointer to source + * @param dest Pointer to destination + * @param len Amount of memory to copy from the source + */ + function copy( + uint256 src, + uint256 dest, + uint256 len + ) private pure { + if (len == 0) return; + + // copy as many word sizes as possible + for (; len >= WORD_SIZE; len -= WORD_SIZE) { + assembly { + mstore(dest, mload(src)) + } + + src += WORD_SIZE; + dest += WORD_SIZE; + } + + // left over bytes. Mask is used to remove unwanted bytes from the word + uint256 mask = 256**(WORD_SIZE - len) - 1; + assembly { + let srcpart := and(mload(src), not(mask)) // zero out src + let destpart := and(mload(dest), mask) // retrieve the bytes + mstore(dest, or(destpart, srcpart)) + } + } +} + +// File: contracts/root/TokenPredicates/ITokenPredicate.sol + +pragma solidity 0.6.6; + + +/// @title Token predicate interface for all pos portal predicates +/// @notice Abstract interface that defines methods for custom predicates +interface ITokenPredicate { + + /** + * @notice Deposit tokens into pos portal + * @dev When `depositor` deposits tokens into pos portal, tokens get locked into predicate contract. + * @param depositor Address who wants to deposit tokens + * @param depositReceiver Address (address) who wants to receive tokens on side chain + * @param rootToken Token which gets deposited + * @param depositData Extra data for deposit (amount for ERC20, token id for ERC721 etc.) [ABI encoded] + */ + function lockTokens( + address depositor, + address depositReceiver, + address rootToken, + bytes calldata depositData + ) external; + + /** + * @notice Validates and processes exit while withdraw process + * @dev Validates exit log emitted on sidechain. Reverts if validation fails. + * @dev Processes withdraw based on custom logic. Example: transfer ERC20/ERC721, mint ERC721 if mintable withdraw + * @param sender Address + * @param rootToken Token which gets withdrawn + * @param logRLPList Valid sidechain log for data like amount, token id etc. + */ + function exitTokens( + address sender, + address rootToken, + bytes calldata logRLPList + ) external; +} + +// File: contracts/common/Initializable.sol + +pragma solidity 0.6.6; + +contract Initializable { + bool inited = false; + + modifier initializer() { + require(!inited, "already inited"); + _; + inited = true; + } +} + +// File: contracts/root/TokenPredicates/MintableERC1155Predicate.sol + +pragma solidity 0.6.6; + + + ERC1155Receiver +} from "@openzeppelin/contracts/token/ERC1155/ERC1155Receiver.sol"; + + + + + +contract MintableERC1155Predicate is + ITokenPredicate, + ERC1155Receiver, + AccessControlMixin, + Initializable +{ + using RLPReader for bytes; + using RLPReader for RLPReader.RLPItem; + + bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE"); + bytes32 public constant TOKEN_TYPE = keccak256("MintableERC1155"); + + bytes32 public constant TRANSFER_SINGLE_EVENT_SIG = keccak256( + "TransferSingle(address,address,address,uint256,uint256)" + ); + bytes32 public constant TRANSFER_BATCH_EVENT_SIG = keccak256( + "TransferBatch(address,address,address,uint256[],uint256[])" + ); + + event LockedBatchMintableERC1155( + address indexed depositor, + address indexed depositReceiver, + address indexed rootToken, + uint256[] ids, + uint256[] amounts + ); + + constructor() public {} + + function initialize(address _owner) external initializer { + _setupContractId("MintableERC1155Predicate"); + _setupRole(DEFAULT_ADMIN_ROLE, _owner); + _setupRole(MANAGER_ROLE, _owner); + } + + /** + * @notice rejects single transfer + */ + function onERC1155Received( + address, + address, + uint256, + uint256, + bytes calldata + ) external override returns (bytes4) { + return 0; + } + + /** + * @notice accepts batch transfer + */ + function onERC1155BatchReceived( + address, + address, + uint256[] calldata, + uint256[] calldata, + bytes calldata + ) external override returns (bytes4) { + return ERC1155Receiver(0).onERC1155BatchReceived.selector; + } + + /** + * @notice Lock ERC1155 tokens for deposit, callable only by manager + * @param depositor Address who wants to deposit tokens + * @param depositReceiver Address (address) who wants to receive tokens on child chain + * @param rootToken Token which gets deposited + * @param depositData ABI encoded id array and amount array + */ + function lockTokens( + address depositor, + address depositReceiver, + address rootToken, + bytes calldata depositData + ) external override only(MANAGER_ROLE) { + // forcing batch deposit since supporting both single and batch deposit introduces too much complexity + ( + uint256[] memory ids, + uint256[] memory amounts, + bytes memory data + ) = abi.decode(depositData, (uint256[], uint256[], bytes)); + + emit LockedBatchMintableERC1155( + depositor, + depositReceiver, + rootToken, + ids, + amounts + ); + IMintableERC1155(rootToken).safeBatchTransferFrom( + depositor, + address(this), + ids, + amounts, + data + ); + } + + /** + * @notice Creates an array of `size` by repeating provided address, + * to be required for passing to batch balance checking function of ERC1155 tokens. + * @param addr Address to be repeated `size` times in resulting array + * @param size Size of resulting array + */ + function makeArrayWithAddress(address addr, uint256 size) + internal + pure + returns (address[] memory) + { + require( + addr != address(0), + "MintableERC1155Predicate: Invalid address" + ); + require( + size > 0, + "MintableERC1155Predicate: Invalid resulting array length" + ); + + address[] memory addresses = new address[](size); + + for (uint256 i = 0; i < size; i++) { + addresses[i] = addr; + } + + return addresses; + } + + /** + * @notice Calculates amount of tokens to be minted, by subtracting available + * token balances from amount of tokens to be exited + * @param tokenBalances Token balances this contract holds for some ordered token ids + * @param amountsToBeExited Amount of tokens being exited + */ + function calculateAmountsToBeMinted( + uint256[] memory tokenBalances, + uint256[] memory amountsToBeExited + ) internal pure returns (uint256[] memory) { + require( + tokenBalances.length == amountsToBeExited.length, + "MintableERC1155Predicate: Array length mismatch found" + ); + + uint256[] memory toBeMintedAmounts = new uint256[]( + tokenBalances.length + ); + + // Iteratively calculating amounts of token to be minted + // + // Please note, in some cases it can be 0, but that will not + // be a problem, due to implementation of mint logic for ERC1155 + for (uint256 i = 0; i < tokenBalances.length; i++) { + if (tokenBalances[i] < amountsToBeExited[i]) { + toBeMintedAmounts[i] = amountsToBeExited[i] - tokenBalances[i]; + } + } + + return toBeMintedAmounts; + } + + /** + * @notice Validates log signature, from and to address + * then sends the correct tokenId, amount to withdrawer + * callable only by manager + * @param rootToken Token which gets withdrawn + * @param log Valid ERC1155 TransferSingle burn or TransferBatch burn log from child chain + */ + function exitTokens( + address, + address rootToken, + bytes memory log + ) public override only(MANAGER_ROLE) { + RLPReader.RLPItem[] memory logRLPList = log.toRlpItem().toList(); + RLPReader.RLPItem[] memory logTopicRLPList = logRLPList[1].toList(); // topics + bytes memory logData = logRLPList[2].toBytes(); + + address withdrawer = address(logTopicRLPList[2].toUint()); // topic2 is from address + + require( + address(logTopicRLPList[3].toUint()) == address(0), // topic3 is to address + "MintableERC1155Predicate: INVALID_RECEIVER" + ); + + if (bytes32(logTopicRLPList[0].toUint()) == TRANSFER_SINGLE_EVENT_SIG) { + // topic0 is event sig + (uint256 id, uint256 amount) = abi.decode( + logData, + (uint256, uint256) + ); + + IMintableERC1155 token = IMintableERC1155(rootToken); + // Currently locked tokens for `id` in this contract + uint256 tokenBalance = token.balanceOf(address(this), id); + + // Checking whether MintableERC1155 contract has enough + // tokens locked in to transfer to withdrawer, if not + // it'll mint those tokens for this contract and return + // safely transfer those to withdrawer + if (tokenBalance < amount) { + token.mint(address(this), id, amount - tokenBalance, bytes("")); + } + + token.safeTransferFrom( + address(this), + withdrawer, + id, + amount, + bytes("") + ); + } else if ( + bytes32(logTopicRLPList[0].toUint()) == TRANSFER_BATCH_EVENT_SIG + ) { + (uint256[] memory ids, uint256[] memory amounts) = abi.decode( + logData, + (uint256[], uint256[]) + ); + + IMintableERC1155 token = IMintableERC1155(rootToken); + + token.mintBatch( + address(this), + ids, + calculateAmountsToBeMinted( + token.balanceOfBatch( + makeArrayWithAddress(address(this), ids.length), + ids + ), + amounts + ), + bytes("") + ); + + IMintableERC1155(rootToken).safeBatchTransferFrom( + address(this), + withdrawer, + ids, + amounts, + bytes("") + ); + } else { + revert("MintableERC1155Predicate: INVALID_WITHDRAW_SIG"); + } + } +} diff --git a/flat/MintableERC1155PredicateProxy.sol b/flat/MintableERC1155PredicateProxy.sol new file mode 100644 index 00000000..33361d02 --- /dev/null +++ b/flat/MintableERC1155PredicateProxy.sol @@ -0,0 +1,169 @@ + +// File: contracts/common/Proxy/IERCProxy.sol + +pragma solidity 0.6.6; + +interface IERCProxy { + function proxyType() external pure returns (uint256 proxyTypeId); + + function implementation() external view returns (address codeAddr); +} + +// File: contracts/common/Proxy/Proxy.sol + +pragma solidity 0.6.6; + + +abstract contract Proxy is IERCProxy { + function delegatedFwd(address _dst, bytes memory _calldata) internal { + // solium-disable-next-line security/no-inline-assembly + assembly { + let result := delegatecall( + sub(gas(), 10000), + _dst, + add(_calldata, 0x20), + mload(_calldata), + 0, + 0 + ) + let size := returndatasize() + + let ptr := mload(0x40) + returndatacopy(ptr, 0, size) + + // revert instead of invalid() bc if the underlying call failed with invalid() it already wasted gas. + // if the call returned error data, forward it + switch result + case 0 { + revert(ptr, size) + } + default { + return(ptr, size) + } + } + } + + function proxyType() external virtual override pure returns (uint256 proxyTypeId) { + // Upgradeable proxy + proxyTypeId = 2; + } + + function implementation() external virtual override view returns (address); +} + +// File: contracts/common/Proxy/UpgradableProxy.sol + +pragma solidity 0.6.6; + + +contract UpgradableProxy is Proxy { + event ProxyUpdated(address indexed _new, address indexed _old); + event ProxyOwnerUpdate(address _new, address _old); + + bytes32 constant IMPLEMENTATION_SLOT = keccak256("matic.network.proxy.implementation"); + bytes32 constant OWNER_SLOT = keccak256("matic.network.proxy.owner"); + + constructor(address _proxyTo) public { + setProxyOwner(msg.sender); + setImplementation(_proxyTo); + } + + fallback() external payable { + delegatedFwd(loadImplementation(), msg.data); + } + + receive() external payable { + delegatedFwd(loadImplementation(), msg.data); + } + + modifier onlyProxyOwner() { + require(loadProxyOwner() == msg.sender, "NOT_OWNER"); + _; + } + + function proxyOwner() external view returns(address) { + return loadProxyOwner(); + } + + function loadProxyOwner() internal view returns(address) { + address _owner; + bytes32 position = OWNER_SLOT; + assembly { + _owner := sload(position) + } + return _owner; + } + + function implementation() external override view returns (address) { + return loadImplementation(); + } + + function loadImplementation() internal view returns(address) { + address _impl; + bytes32 position = IMPLEMENTATION_SLOT; + assembly { + _impl := sload(position) + } + return _impl; + } + + function transferProxyOwnership(address newOwner) public onlyProxyOwner { + require(newOwner != address(0), "ZERO_ADDRESS"); + emit ProxyOwnerUpdate(newOwner, loadProxyOwner()); + setProxyOwner(newOwner); + } + + function setProxyOwner(address newOwner) private { + bytes32 position = OWNER_SLOT; + assembly { + sstore(position, newOwner) + } + } + + function updateImplementation(address _newProxyTo) public onlyProxyOwner { + require(_newProxyTo != address(0x0), "INVALID_PROXY_ADDRESS"); + require(isContract(_newProxyTo), "DESTINATION_ADDRESS_IS_NOT_A_CONTRACT"); + + emit ProxyUpdated(_newProxyTo, loadImplementation()); + + setImplementation(_newProxyTo); + } + + function updateAndCall(address _newProxyTo, bytes memory data) payable public onlyProxyOwner { + updateImplementation(_newProxyTo); + + (bool success, bytes memory returnData) = address(this).call{value: msg.value}(data); + require(success, string(returnData)); + } + + function setImplementation(address _newProxyTo) private { + bytes32 position = IMPLEMENTATION_SLOT; + assembly { + sstore(position, _newProxyTo) + } + } + + function isContract(address _target) internal view returns (bool) { + if (_target == address(0)) { + return false; + } + + uint256 size; + assembly { + size := extcodesize(_target) + } + return size > 0; + } +} + +// File: contracts/root/TokenPredicates/MintableERC1155PredicateProxy.sol + +pragma solidity 0.6.6; + + +contract MintableERC1155PredicateProxy is UpgradableProxy { + constructor(address _proxyTo) + public + UpgradableProxy(_proxyTo) + {} +} diff --git a/flat/MintableERC20Predicate.sol b/flat/MintableERC20Predicate.sol new file mode 100644 index 00000000..a43076e3 --- /dev/null +++ b/flat/MintableERC20Predicate.sol @@ -0,0 +1,1175 @@ + +// File: @openzeppelin/contracts/token/ERC20/IERC20.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Interface of the ERC20 standard as defined in the EIP. + */ +interface IERC20 { + /** + * @dev Returns the amount of tokens in existence. + */ + function totalSupply() external view returns (uint256); + + /** + * @dev Returns the amount of tokens owned by `account`. + */ + function balanceOf(address account) external view returns (uint256); + + /** + * @dev Moves `amount` tokens from the caller's account to `recipient`. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transfer(address recipient, uint256 amount) external returns (bool); + + /** + * @dev Returns the remaining number of tokens that `spender` will be + * allowed to spend on behalf of `owner` through {transferFrom}. This is + * zero by default. + * + * This value changes when {approve} or {transferFrom} are called. + */ + function allowance(address owner, address spender) external view returns (uint256); + + /** + * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * IMPORTANT: Beware that changing an allowance with this method brings the risk + * that someone may use both the old and the new allowance by unfortunate + * transaction ordering. One possible solution to mitigate this race + * condition is to first reduce the spender's allowance to 0 and set the + * desired value afterwards: + * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 + * + * Emits an {Approval} event. + */ + function approve(address spender, uint256 amount) external returns (bool); + + /** + * @dev Moves `amount` tokens from `sender` to `recipient` using the + * allowance mechanism. `amount` is then deducted from the caller's + * allowance. + * + * Returns a boolean value indicating whether the operation succeeded. + * + * Emits a {Transfer} event. + */ + function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); + + /** + * @dev Emitted when `value` tokens are moved from one account (`from`) to + * another (`to`). + * + * Note that `value` may be zero. + */ + event Transfer(address indexed from, address indexed to, uint256 value); + + /** + * @dev Emitted when the allowance of a `spender` for an `owner` is set by + * a call to {approve}. `value` is the new allowance. + */ + event Approval(address indexed owner, address indexed spender, uint256 value); +} + +// File: contracts/root/RootToken/IMintableERC20.sol + +pragma solidity 0.6.6; + +interface IMintableERC20 is IERC20 { + /** + * @notice called by predicate contract to mint tokens while withdrawing + * @dev Should be callable only by MintableERC20Predicate + * Make sure minting is done only by this function + * @param user user address for whom token is being minted + * @param amount amount of token being minted + */ + function mint(address user, uint256 amount) external; +} + +// File: @openzeppelin/contracts/utils/EnumerableSet.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/** + * @dev Library for managing + * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive + * types. + * + * Sets have the following properties: + * + * - Elements are added, removed, and checked for existence in constant time + * (O(1)). + * - Elements are enumerated in O(n). No guarantees are made on the ordering. + * + * ``` + * contract Example { + * // Add the library methods + * using EnumerableSet for EnumerableSet.AddressSet; + * + * // Declare a set state variable + * EnumerableSet.AddressSet private mySet; + * } + * ``` + * + * As of v3.0.0, only sets of type `address` (`AddressSet`) and `uint256` + * (`UintSet`) are supported. + */ +library EnumerableSet { + // To implement this library for multiple types with as little code + // repetition as possible, we write it in terms of a generic Set type with + // bytes32 values. + // The Set implementation uses private functions, and user-facing + // implementations (such as AddressSet) are just wrappers around the + // underlying Set. + // This means that we can only create new EnumerableSets for types that fit + // in bytes32. + + struct Set { + // Storage of set values + bytes32[] _values; + + // Position of the value in the `values` array, plus 1 because index 0 + // means a value is not in the set. + mapping (bytes32 => uint256) _indexes; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function _add(Set storage set, bytes32 value) private returns (bool) { + if (!_contains(set, value)) { + set._values.push(value); + // The value is stored at length-1, but we add 1 to all indexes + // and use 0 as a sentinel value + set._indexes[value] = set._values.length; + return true; + } else { + return false; + } + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function _remove(Set storage set, bytes32 value) private returns (bool) { + // We read and store the value's index to prevent multiple reads from the same storage slot + uint256 valueIndex = set._indexes[value]; + + if (valueIndex != 0) { // Equivalent to contains(set, value) + // To delete an element from the _values array in O(1), we swap the element to delete with the last one in + // the array, and then remove the last element (sometimes called as 'swap and pop'). + // This modifies the order of the array, as noted in {at}. + + uint256 toDeleteIndex = valueIndex - 1; + uint256 lastIndex = set._values.length - 1; + + // When the value to delete is the last one, the swap operation is unnecessary. However, since this occurs + // so rarely, we still do the swap anyway to avoid the gas cost of adding an 'if' statement. + + bytes32 lastvalue = set._values[lastIndex]; + + // Move the last value to the index where the value to delete is + set._values[toDeleteIndex] = lastvalue; + // Update the index for the moved value + set._indexes[lastvalue] = toDeleteIndex + 1; // All indexes are 1-based + + // Delete the slot where the moved value was stored + set._values.pop(); + + // Delete the index for the deleted slot + delete set._indexes[value]; + + return true; + } else { + return false; + } + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function _contains(Set storage set, bytes32 value) private view returns (bool) { + return set._indexes[value] != 0; + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function _length(Set storage set) private view returns (uint256) { + return set._values.length; + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function _at(Set storage set, uint256 index) private view returns (bytes32) { + require(set._values.length > index, "EnumerableSet: index out of bounds"); + return set._values[index]; + } + + // AddressSet + + struct AddressSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(AddressSet storage set, address value) internal returns (bool) { + return _add(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(AddressSet storage set, address value) internal returns (bool) { + return _remove(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(AddressSet storage set, address value) internal view returns (bool) { + return _contains(set._inner, bytes32(uint256(value))); + } + + /** + * @dev Returns the number of values in the set. O(1). + */ + function length(AddressSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(AddressSet storage set, uint256 index) internal view returns (address) { + return address(uint256(_at(set._inner, index))); + } + + + // UintSet + + struct UintSet { + Set _inner; + } + + /** + * @dev Add a value to a set. O(1). + * + * Returns true if the value was added to the set, that is if it was not + * already present. + */ + function add(UintSet storage set, uint256 value) internal returns (bool) { + return _add(set._inner, bytes32(value)); + } + + /** + * @dev Removes a value from a set. O(1). + * + * Returns true if the value was removed from the set, that is if it was + * present. + */ + function remove(UintSet storage set, uint256 value) internal returns (bool) { + return _remove(set._inner, bytes32(value)); + } + + /** + * @dev Returns true if the value is in the set. O(1). + */ + function contains(UintSet storage set, uint256 value) internal view returns (bool) { + return _contains(set._inner, bytes32(value)); + } + + /** + * @dev Returns the number of values on the set. O(1). + */ + function length(UintSet storage set) internal view returns (uint256) { + return _length(set._inner); + } + + /** + * @dev Returns the value stored at position `index` in the set. O(1). + * + * Note that there are no guarantees on the ordering of values inside the + * array, and it may change when more values are added or removed. + * + * Requirements: + * + * - `index` must be strictly less than {length}. + */ + function at(UintSet storage set, uint256 index) internal view returns (uint256) { + return uint256(_at(set._inner, index)); + } +} + +// File: @openzeppelin/contracts/utils/Address.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.2; + +/** + * @dev Collection of functions related to the address type + */ +library Address { + /** + * @dev Returns true if `account` is a contract. + * + * [IMPORTANT] + * ==== + * It is unsafe to assume that an address for which this function returns + * false is an externally-owned account (EOA) and not a contract. + * + * Among others, `isContract` will return false for the following + * types of addresses: + * + * - an externally-owned account + * - a contract in construction + * - an address where a contract will be created + * - an address where a contract lived, but was destroyed + * ==== + */ + function isContract(address account) internal view returns (bool) { + // According to EIP-1052, 0x0 is the value returned for not-yet created accounts + // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned + // for accounts without code, i.e. `keccak256('')` + bytes32 codehash; + bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; + // solhint-disable-next-line no-inline-assembly + assembly { codehash := extcodehash(account) } + return (codehash != accountHash && codehash != 0x0); + } + + /** + * @dev Replacement for Solidity's `transfer`: sends `amount` wei to + * `recipient`, forwarding all available gas and reverting on errors. + * + * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost + * of certain opcodes, possibly making contracts go over the 2300 gas limit + * imposed by `transfer`, making them unable to receive funds via + * `transfer`. {sendValue} removes this limitation. + * + * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. + * + * IMPORTANT: because control is transferred to `recipient`, care must be + * taken to not create reentrancy vulnerabilities. Consider using + * {ReentrancyGuard} or the + * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. + */ + function sendValue(address payable recipient, uint256 amount) internal { + require(address(this).balance >= amount, "Address: insufficient balance"); + + // solhint-disable-next-line avoid-low-level-calls, avoid-call-value + (bool success, ) = recipient.call{ value: amount }(""); + require(success, "Address: unable to send value, recipient may have reverted"); + } + + /** + * @dev Performs a Solidity function call using a low level `call`. A + * plain`call` is an unsafe replacement for a function call: use this + * function instead. + * + * If `target` reverts with a revert reason, it is bubbled up by this + * function (like regular Solidity function calls). + * + * Returns the raw returned data. To convert to the expected return value, + * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. + * + * Requirements: + * + * - `target` must be a contract. + * - calling `target` with `data` must not revert. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data) internal returns (bytes memory) { + return functionCall(target, data, "Address: low-level call failed"); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with + * `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { + return _functionCallWithValue(target, data, 0, errorMessage); + } + + /** + * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], + * but also transferring `value` wei to `target`. + * + * Requirements: + * + * - the calling contract must have an ETH balance of at least `value`. + * - the called Solidity function must be `payable`. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { + return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); + } + + /** + * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but + * with `errorMessage` as a fallback revert reason when `target` reverts. + * + * _Available since v3.1._ + */ + function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { + require(address(this).balance >= value, "Address: insufficient balance for call"); + return _functionCallWithValue(target, data, value, errorMessage); + } + + function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { + require(isContract(target), "Address: call to non-contract"); + + // solhint-disable-next-line avoid-low-level-calls + (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); + if (success) { + return returndata; + } else { + // Look for revert reason and bubble it up if present + if (returndata.length > 0) { + // The easiest way to bubble the revert reason is using memory via assembly + + // solhint-disable-next-line no-inline-assembly + assembly { + let returndata_size := mload(returndata) + revert(add(32, returndata), returndata_size) + } + } else { + revert(errorMessage); + } + } + } +} + +// File: @openzeppelin/contracts/GSN/Context.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + +/* + * @dev Provides information about the current execution context, including the + * sender of the transaction and its data. While these are generally available + * via msg.sender and msg.data, they should not be accessed in such a direct + * manner, since when dealing with GSN meta-transactions the account sending and + * paying for execution may not be the actual sender (as far as an application + * is concerned). + * + * This contract is only required for intermediate, library-like contracts. + */ +abstract contract Context { + function _msgSender() internal view virtual returns (address payable) { + return msg.sender; + } + + function _msgData() internal view virtual returns (bytes memory) { + this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 + return msg.data; + } +} + +// File: @openzeppelin/contracts/access/AccessControl.sol + +// SPDX-License-Identifier: MIT + +pragma solidity ^0.6.0; + + + + +/** + * @dev Contract module that allows children to implement role-based access + * control mechanisms. + * + * Roles are referred to by their `bytes32` identifier. These should be exposed + * in the external API and be unique. The best way to achieve this is by + * using `public constant` hash digests: + * + * ``` + * bytes32 public constant MY_ROLE = keccak256("MY_ROLE"); + * ``` + * + * Roles can be used to represent a set of permissions. To restrict access to a + * function call, use {hasRole}: + * + * ``` + * function foo() public { + * require(hasRole(MY_ROLE, msg.sender)); + * ... + * } + * ``` + * + * Roles can be granted and revoked dynamically via the {grantRole} and + * {revokeRole} functions. Each role has an associated admin role, and only + * accounts that have a role's admin role can call {grantRole} and {revokeRole}. + * + * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means + * that only accounts with this role will be able to grant or revoke other + * roles. More complex role relationships can be created by using + * {_setRoleAdmin}. + * + * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to + * grant and revoke this role. Extra precautions should be taken to secure + * accounts that have been granted it. + */ +abstract contract AccessControl is Context { + using EnumerableSet for EnumerableSet.AddressSet; + using Address for address; + + struct RoleData { + EnumerableSet.AddressSet members; + bytes32 adminRole; + } + + mapping (bytes32 => RoleData) private _roles; + + bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00; + + /** + * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole` + * + * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite + * {RoleAdminChanged} not being emitted signaling this. + * + * _Available since v3.1._ + */ + event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole); + + /** + * @dev Emitted when `account` is granted `role`. + * + * `sender` is the account that originated the contract call, an admin role + * bearer except when using {_setupRole}. + */ + event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Emitted when `account` is revoked `role`. + * + * `sender` is the account that originated the contract call: + * - if using `revokeRole`, it is the admin role bearer + * - if using `renounceRole`, it is the role bearer (i.e. `account`) + */ + event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender); + + /** + * @dev Returns `true` if `account` has been granted `role`. + */ + function hasRole(bytes32 role, address account) public view returns (bool) { + return _roles[role].members.contains(account); + } + + /** + * @dev Returns the number of accounts that have `role`. Can be used + * together with {getRoleMember} to enumerate all bearers of a role. + */ + function getRoleMemberCount(bytes32 role) public view returns (uint256) { + return _roles[role].members.length(); + } + + /** + * @dev Returns one of the accounts that have `role`. `index` must be a + * value between 0 and {getRoleMemberCount}, non-inclusive. + * + * Role bearers are not sorted in any particular way, and their ordering may + * change at any point. + * + * WARNING: When using {getRoleMember} and {getRoleMemberCount}, make sure + * you perform all queries on the same block. See the following + * https://forum.openzeppelin.com/t/iterating-over-elements-on-enumerableset-in-openzeppelin-contracts/2296[forum post] + * for more information. + */ + function getRoleMember(bytes32 role, uint256 index) public view returns (address) { + return _roles[role].members.at(index); + } + + /** + * @dev Returns the admin role that controls `role`. See {grantRole} and + * {revokeRole}. + * + * To change a role's admin, use {_setRoleAdmin}. + */ + function getRoleAdmin(bytes32 role) public view returns (bytes32) { + return _roles[role].adminRole; + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function grantRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to grant"); + + _grantRole(role, account); + } + + /** + * @dev Revokes `role` from `account`. + * + * If `account` had been granted `role`, emits a {RoleRevoked} event. + * + * Requirements: + * + * - the caller must have ``role``'s admin role. + */ + function revokeRole(bytes32 role, address account) public virtual { + require(hasRole(_roles[role].adminRole, _msgSender()), "AccessControl: sender must be an admin to revoke"); + + _revokeRole(role, account); + } + + /** + * @dev Revokes `role` from the calling account. + * + * Roles are often managed via {grantRole} and {revokeRole}: this function's + * purpose is to provide a mechanism for accounts to lose their privileges + * if they are compromised (such as when a trusted device is misplaced). + * + * If the calling account had been granted `role`, emits a {RoleRevoked} + * event. + * + * Requirements: + * + * - the caller must be `account`. + */ + function renounceRole(bytes32 role, address account) public virtual { + require(account == _msgSender(), "AccessControl: can only renounce roles for self"); + + _revokeRole(role, account); + } + + /** + * @dev Grants `role` to `account`. + * + * If `account` had not been already granted `role`, emits a {RoleGranted} + * event. Note that unlike {grantRole}, this function doesn't perform any + * checks on the calling account. + * + * [WARNING] + * ==== + * This function should only be called from the constructor when setting + * up the initial roles for the system. + * + * Using this function in any other way is effectively circumventing the admin + * system imposed by {AccessControl}. + * ==== + */ + function _setupRole(bytes32 role, address account) internal virtual { + _grantRole(role, account); + } + + /** + * @dev Sets `adminRole` as ``role``'s admin role. + * + * Emits a {RoleAdminChanged} event. + */ + function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual { + emit RoleAdminChanged(role, _roles[role].adminRole, adminRole); + _roles[role].adminRole = adminRole; + } + + function _grantRole(bytes32 role, address account) private { + if (_roles[role].members.add(account)) { + emit RoleGranted(role, account, _msgSender()); + } + } + + function _revokeRole(bytes32 role, address account) private { + if (_roles[role].members.remove(account)) { + emit RoleRevoked(role, account, _msgSender()); + } + } +} + +// File: contracts/common/AccessControlMixin.sol + +pragma solidity 0.6.6; + + +contract AccessControlMixin is AccessControl { + string private _revertMsg; + function _setupContractId(string memory contractId) internal { + _revertMsg = string(abi.encodePacked(contractId, ": INSUFFICIENT_PERMISSIONS")); + } + + modifier only(bytes32 role) { + require( + hasRole(role, _msgSender()), + _revertMsg + ); + _; + } +} + +// File: contracts/lib/RLPReader.sol + +/* + * @author Hamdi Allam hamdi.allam97@gmail.com + * Please reach out with any questions or concerns + * https://github.com/hamdiallam/Solidity-RLP/blob/e681e25a376dbd5426b509380bc03446f05d0f97/contracts/RLPReader.sol + */ +pragma solidity 0.6.6; + +library RLPReader { + uint8 constant STRING_SHORT_START = 0x80; + uint8 constant STRING_LONG_START = 0xb8; + uint8 constant LIST_SHORT_START = 0xc0; + uint8 constant LIST_LONG_START = 0xf8; + uint8 constant WORD_SIZE = 32; + + struct RLPItem { + uint256 len; + uint256 memPtr; + } + + /* + * @param item RLP encoded bytes + */ + function toRlpItem(bytes memory item) + internal + pure + returns (RLPItem memory) + { + require(item.length > 0, "RLPReader: INVALID_BYTES_LENGTH"); + uint256 memPtr; + assembly { + memPtr := add(item, 0x20) + } + + return RLPItem(item.length, memPtr); + } + + /* + * @param item RLP encoded list in bytes + */ + function toList(RLPItem memory item) + internal + pure + returns (RLPItem[] memory) + { + require(isList(item), "RLPReader: ITEM_NOT_LIST"); + + uint256 items = numItems(item); + RLPItem[] memory result = new RLPItem[](items); + uint256 listLength = _itemLength(item.memPtr); + require(listLength == item.len, "RLPReader: LIST_DECODED_LENGTH_MISMATCH"); + + uint256 memPtr = item.memPtr + _payloadOffset(item.memPtr); + uint256 dataLen; + for (uint256 i = 0; i < items; i++) { + dataLen = _itemLength(memPtr); + result[i] = RLPItem(dataLen, memPtr); + memPtr = memPtr + dataLen; + } + + return result; + } + + // @return indicator whether encoded payload is a list. negate this function call for isData. + function isList(RLPItem memory item) internal pure returns (bool) { + uint8 byte0; + uint256 memPtr = item.memPtr; + assembly { + byte0 := byte(0, mload(memPtr)) + } + + if (byte0 < LIST_SHORT_START) return false; + return true; + } + + /** RLPItem conversions into data types **/ + + // @returns raw rlp encoding in bytes + function toRlpBytes(RLPItem memory item) + internal + pure + returns (bytes memory) + { + bytes memory result = new bytes(item.len); + + uint256 ptr; + assembly { + ptr := add(0x20, result) + } + + copy(item.memPtr, ptr, item.len); + return result; + } + + function toAddress(RLPItem memory item) internal pure returns (address) { + require(!isList(item), "RLPReader: DECODING_LIST_AS_ADDRESS"); + // 1 byte for the length prefix + require(item.len == 21, "RLPReader: INVALID_ADDRESS_LENGTH"); + + return address(toUint(item)); + } + + function toUint(RLPItem memory item) internal pure returns (uint256) { + require(!isList(item), "RLPReader: DECODING_LIST_AS_UINT"); + require(item.len <= 33, "RLPReader: INVALID_UINT_LENGTH"); + + uint256 itemLength = _itemLength(item.memPtr); + require(itemLength == item.len, "RLPReader: UINT_DECODED_LENGTH_MISMATCH"); + + uint256 offset = _payloadOffset(item.memPtr); + uint256 len = item.len - offset; + uint256 result; + uint256 memPtr = item.memPtr + offset; + assembly { + result := mload(memPtr) + + // shfit to the correct location if neccesary + if lt(len, 32) { + result := div(result, exp(256, sub(32, len))) + } + } + + return result; + } + + // enforces 32 byte length + function toUintStrict(RLPItem memory item) internal pure returns (uint256) { + uint256 itemLength = _itemLength(item.memPtr); + require(itemLength == item.len, "RLPReader: UINT_STRICT_DECODED_LENGTH_MISMATCH"); + // one byte prefix + require(item.len == 33, "RLPReader: INVALID_UINT_STRICT_LENGTH"); + + uint256 result; + uint256 memPtr = item.memPtr + 1; + assembly { + result := mload(memPtr) + } + + return result; + } + + function toBytes(RLPItem memory item) internal pure returns (bytes memory) { + uint256 listLength = _itemLength(item.memPtr); + require(listLength == item.len, "RLPReader: BYTES_DECODED_LENGTH_MISMATCH"); + uint256 offset = _payloadOffset(item.memPtr); + + uint256 len = item.len - offset; // data length + bytes memory result = new bytes(len); + + uint256 destPtr; + assembly { + destPtr := add(0x20, result) + } + + copy(item.memPtr + offset, destPtr, len); + return result; + } + + /* + * Private Helpers + */ + + // @return number of payload items inside an encoded list. + function numItems(RLPItem memory item) private pure returns (uint256) { + // add `isList` check if `item` is expected to be passsed without a check from calling function + // require(isList(item), "RLPReader: NUM_ITEMS_NOT_LIST"); + + uint256 count = 0; + uint256 currPtr = item.memPtr + _payloadOffset(item.memPtr); + uint256 endPtr = item.memPtr + item.len; + while (currPtr < endPtr) { + currPtr = currPtr + _itemLength(currPtr); // skip over an item + require(currPtr <= endPtr, "RLPReader: NUM_ITEMS_DECODED_LENGTH_MISMATCH"); + count++; + } + + return count; + } + + // @return entire rlp item byte length + function _itemLength(uint256 memPtr) private pure returns (uint256) { + uint256 itemLen; + uint256 byte0; + assembly { + byte0 := byte(0, mload(memPtr)) + } + + if (byte0 < STRING_SHORT_START) itemLen = 1; + else if (byte0 < STRING_LONG_START) + itemLen = byte0 - STRING_SHORT_START + 1; + else if (byte0 < LIST_SHORT_START) { + assembly { + let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is + memPtr := add(memPtr, 1) // skip over the first byte + + /* 32 byte word size */ + let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len + itemLen := add(dataLen, add(byteLen, 1)) + } + } else if (byte0 < LIST_LONG_START) { + itemLen = byte0 - LIST_SHORT_START + 1; + } else { + assembly { + let byteLen := sub(byte0, 0xf7) + memPtr := add(memPtr, 1) + + let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length + itemLen := add(dataLen, add(byteLen, 1)) + } + } + + return itemLen; + } + + // @return number of bytes until the data + function _payloadOffset(uint256 memPtr) private pure returns (uint256) { + uint256 byte0; + assembly { + byte0 := byte(0, mload(memPtr)) + } + + if (byte0 < STRING_SHORT_START) return 0; + else if ( + byte0 < STRING_LONG_START || + (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START) + ) return 1; + else if (byte0 < LIST_SHORT_START) + // being explicit + return byte0 - (STRING_LONG_START - 1) + 1; + else return byte0 - (LIST_LONG_START - 1) + 1; + } + + /* + * @param src Pointer to source + * @param dest Pointer to destination + * @param len Amount of memory to copy from the source + */ + function copy( + uint256 src, + uint256 dest, + uint256 len + ) private pure { + if (len == 0) return; + + // copy as many word sizes as possible + for (; len >= WORD_SIZE; len -= WORD_SIZE) { + assembly { + mstore(dest, mload(src)) + } + + src += WORD_SIZE; + dest += WORD_SIZE; + } + + // left over bytes. Mask is used to remove unwanted bytes from the word + uint256 mask = 256**(WORD_SIZE - len) - 1; + assembly { + let srcpart := and(mload(src), not(mask)) // zero out src + let destpart := and(mload(dest), mask) // retrieve the bytes + mstore(dest, or(destpart, srcpart)) + } + } +} + +// File: contracts/root/TokenPredicates/ITokenPredicate.sol + +pragma solidity 0.6.6; + + +/// @title Token predicate interface for all pos portal predicates +/// @notice Abstract interface that defines methods for custom predicates +interface ITokenPredicate { + + /** + * @notice Deposit tokens into pos portal + * @dev When `depositor` deposits tokens into pos portal, tokens get locked into predicate contract. + * @param depositor Address who wants to deposit tokens + * @param depositReceiver Address (address) who wants to receive tokens on side chain + * @param rootToken Token which gets deposited + * @param depositData Extra data for deposit (amount for ERC20, token id for ERC721 etc.) [ABI encoded] + */ + function lockTokens( + address depositor, + address depositReceiver, + address rootToken, + bytes calldata depositData + ) external; + + /** + * @notice Validates and processes exit while withdraw process + * @dev Validates exit log emitted on sidechain. Reverts if validation fails. + * @dev Processes withdraw based on custom logic. Example: transfer ERC20/ERC721, mint ERC721 if mintable withdraw + * @param sender Address + * @param rootToken Token which gets withdrawn + * @param logRLPList Valid sidechain log for data like amount, token id etc. + */ + function exitTokens( + address sender, + address rootToken, + bytes calldata logRLPList + ) external; +} + +// File: contracts/common/Initializable.sol + +pragma solidity 0.6.6; + +contract Initializable { + bool inited = false; + + modifier initializer() { + require(!inited, "already inited"); + _; + inited = true; + } +} + +// File: contracts/root/TokenPredicates/MintableERC20Predicate.sol + +pragma solidity 0.6.6; + + + + + + +contract MintableERC20Predicate is + ITokenPredicate, + AccessControlMixin, + Initializable +{ + using RLPReader for bytes; + using RLPReader for RLPReader.RLPItem; + + bytes32 public constant MANAGER_ROLE = keccak256("MANAGER_ROLE"); + bytes32 public constant TOKEN_TYPE = keccak256("MintableERC20"); + bytes32 public constant TRANSFER_EVENT_SIG = keccak256( + "Transfer(address,address,uint256)" + ); + + event LockedMintableERC20( + address indexed depositor, + address indexed depositReceiver, + address indexed rootToken, + uint256 amount + ); + + constructor() public {} + + function initialize(address _owner) external initializer { + _setupContractId("MintableERC20Predicate"); + _setupRole(DEFAULT_ADMIN_ROLE, _owner); + _setupRole(MANAGER_ROLE, _owner); + } + + /** + * @notice Lock ERC20 tokens for deposit, callable only by manager + * @param depositor Address who wants to deposit tokens + * @param depositReceiver Address (address) who wants to receive tokens on child chain + * @param rootToken Token which gets deposited + * @param depositData ABI encoded amount + */ + function lockTokens( + address depositor, + address depositReceiver, + address rootToken, + bytes calldata depositData + ) external override only(MANAGER_ROLE) { + uint256 amount = abi.decode(depositData, (uint256)); + + emit LockedMintableERC20(depositor, depositReceiver, rootToken, amount); + IMintableERC20(rootToken).transferFrom( + depositor, + address(this), + amount + ); + } + + /** + * @notice Validates log signature, from and to address + * then sends the correct amount to withdrawer + * callable only by manager + * @param rootToken Token which gets withdrawn + * @param log Valid ERC20 burn log from child chain + */ + function exitTokens( + address, + address rootToken, + bytes memory log + ) public override only(MANAGER_ROLE) { + RLPReader.RLPItem[] memory logRLPList = log.toRlpItem().toList(); + RLPReader.RLPItem[] memory logTopicRLPList = logRLPList[1].toList(); // topics + + require( + bytes32(logTopicRLPList[0].toUint()) == TRANSFER_EVENT_SIG, // topic0 is `Transfer` event sig + "MintableERC20Predicate: INVALID_SIGNATURE" + ); + + address withdrawer = address(logTopicRLPList[1].toUint()); // topic1 is `from` address + + require( + address(logTopicRLPList[2].toUint()) == address(0), // topic2 is `to` address + "MintableERC20Predicate: INVALID_RECEIVER" + ); + + IMintableERC20 token = IMintableERC20(rootToken); + + uint256 tokenBalance = token.balanceOf(address(this)); + uint256 amount = logRLPList[2].toUint(); + + // Checking whether MintableERC20Predicate has enough balance + // to transfer `amount` to withdrawer or not + // + // If no, it'll mint those extra tokens & transfer `amount` + // to withdrawer + if (tokenBalance < amount) { + token.mint(address(this), amount - tokenBalance); + } + + token.transfer(withdrawer, amount); + } +} diff --git a/flat/MintableERC20PredicateProxy.sol b/flat/MintableERC20PredicateProxy.sol new file mode 100644 index 00000000..814c4796 --- /dev/null +++ b/flat/MintableERC20PredicateProxy.sol @@ -0,0 +1,169 @@ + +// File: contracts/common/Proxy/IERCProxy.sol + +pragma solidity 0.6.6; + +interface IERCProxy { + function proxyType() external pure returns (uint256 proxyTypeId); + + function implementation() external view returns (address codeAddr); +} + +// File: contracts/common/Proxy/Proxy.sol + +pragma solidity 0.6.6; + + +abstract contract Proxy is IERCProxy { + function delegatedFwd(address _dst, bytes memory _calldata) internal { + // solium-disable-next-line security/no-inline-assembly + assembly { + let result := delegatecall( + sub(gas(), 10000), + _dst, + add(_calldata, 0x20), + mload(_calldata), + 0, + 0 + ) + let size := returndatasize() + + let ptr := mload(0x40) + returndatacopy(ptr, 0, size) + + // revert instead of invalid() bc if the underlying call failed with invalid() it already wasted gas. + // if the call returned error data, forward it + switch result + case 0 { + revert(ptr, size) + } + default { + return(ptr, size) + } + } + } + + function proxyType() external virtual override pure returns (uint256 proxyTypeId) { + // Upgradeable proxy + proxyTypeId = 2; + } + + function implementation() external virtual override view returns (address); +} + +// File: contracts/common/Proxy/UpgradableProxy.sol + +pragma solidity 0.6.6; + + +contract UpgradableProxy is Proxy { + event ProxyUpdated(address indexed _new, address indexed _old); + event ProxyOwnerUpdate(address _new, address _old); + + bytes32 constant IMPLEMENTATION_SLOT = keccak256("matic.network.proxy.implementation"); + bytes32 constant OWNER_SLOT = keccak256("matic.network.proxy.owner"); + + constructor(address _proxyTo) public { + setProxyOwner(msg.sender); + setImplementation(_proxyTo); + } + + fallback() external payable { + delegatedFwd(loadImplementation(), msg.data); + } + + receive() external payable { + delegatedFwd(loadImplementation(), msg.data); + } + + modifier onlyProxyOwner() { + require(loadProxyOwner() == msg.sender, "NOT_OWNER"); + _; + } + + function proxyOwner() external view returns(address) { + return loadProxyOwner(); + } + + function loadProxyOwner() internal view returns(address) { + address _owner; + bytes32 position = OWNER_SLOT; + assembly { + _owner := sload(position) + } + return _owner; + } + + function implementation() external override view returns (address) { + return loadImplementation(); + } + + function loadImplementation() internal view returns(address) { + address _impl; + bytes32 position = IMPLEMENTATION_SLOT; + assembly { + _impl := sload(position) + } + return _impl; + } + + function transferProxyOwnership(address newOwner) public onlyProxyOwner { + require(newOwner != address(0), "ZERO_ADDRESS"); + emit ProxyOwnerUpdate(newOwner, loadProxyOwner()); + setProxyOwner(newOwner); + } + + function setProxyOwner(address newOwner) private { + bytes32 position = OWNER_SLOT; + assembly { + sstore(position, newOwner) + } + } + + function updateImplementation(address _newProxyTo) public onlyProxyOwner { + require(_newProxyTo != address(0x0), "INVALID_PROXY_ADDRESS"); + require(isContract(_newProxyTo), "DESTINATION_ADDRESS_IS_NOT_A_CONTRACT"); + + emit ProxyUpdated(_newProxyTo, loadImplementation()); + + setImplementation(_newProxyTo); + } + + function updateAndCall(address _newProxyTo, bytes memory data) payable public onlyProxyOwner { + updateImplementation(_newProxyTo); + + (bool success, bytes memory returnData) = address(this).call{value: msg.value}(data); + require(success, string(returnData)); + } + + function setImplementation(address _newProxyTo) private { + bytes32 position = IMPLEMENTATION_SLOT; + assembly { + sstore(position, _newProxyTo) + } + } + + function isContract(address _target) internal view returns (bool) { + if (_target == address(0)) { + return false; + } + + uint256 size; + assembly { + size := extcodesize(_target) + } + return size > 0; + } +} + +// File: contracts/root/TokenPredicates/MintableERC20PredicateProxy.sol + +pragma solidity 0.6.6; + + +contract MintableERC20PredicateProxy is UpgradableProxy { + constructor(address _proxyTo) + public + UpgradableProxy(_proxyTo) + {} +} diff --git a/migrations/2_deploy_root_chain_contracts.js b/migrations/2_deploy_root_chain_contracts.js index 2480abae..24375452 100644 --- a/migrations/2_deploy_root_chain_contracts.js +++ b/migrations/2_deploy_root_chain_contracts.js @@ -9,20 +9,34 @@ const SafeMath = artifacts.require('SafeMath') const RootChainManager = artifacts.require('RootChainManager') const RootChainManagerProxy = artifacts.require('RootChainManagerProxy') const DummyStateSender = artifacts.require('DummyStateSender') + const ERC20Predicate = artifacts.require('ERC20Predicate') const ERC20PredicateProxy = artifacts.require('ERC20PredicateProxy') +const MintableERC20Predicate = artifacts.require('MintableERC20Predicate') +const MintableERC20PredicateProxy = artifacts.require('MintableERC20PredicateProxy') + const ERC721Predicate = artifacts.require('ERC721Predicate') const ERC721PredicateProxy = artifacts.require('ERC721PredicateProxy') const MintableERC721Predicate = artifacts.require('MintableERC721Predicate') const MintableERC721PredicateProxy = artifacts.require('MintableERC721PredicateProxy') + const ERC1155Predicate = artifacts.require('ERC1155Predicate') const ERC1155PredicateProxy = artifacts.require('ERC1155PredicateProxy') +const MintableERC1155Predicate = artifacts.require('MintableERC1155Predicate') +const MintableERC1155PredicateProxy = artifacts.require('MintableERC1155PredicateProxy') + const EtherPredicate = artifacts.require('EtherPredicate') const EtherPredicateProxy = artifacts.require('EtherPredicateProxy') + const DummyERC20 = artifacts.require('DummyERC20') +const DummyMintableERC20 = artifacts.require('DummyMintableERC20') + const DummyERC721 = artifacts.require('DummyERC721') const DummyMintableERC721 = artifacts.require('DummyMintableERC721') + const DummyERC1155 = artifacts.require('DummyERC1155') +const DummyMintableERC1155 = artifacts.require('DummyMintableERC1155') + const TestRootTunnel = artifacts.require('TestRootTunnel') const TestChildTunnel = artifacts.require('TestChildTunnel') @@ -36,49 +50,93 @@ module.exports = async(deployer, network, accounts) => { const rootChainManagerProxy = await deployer.deploy(RootChainManagerProxy, '0x0000000000000000000000000000000000000000') await rootChainManagerProxy.updateAndCall(RootChainManager.address, rootChainManager.contract.methods.initialize(accounts[0]).encodeABI()) + // -- ERC20 Predicates Deployment, starting const erc20Predicate = await deployer.deploy(ERC20Predicate) const erc20PredicateProxy = await deployer.deploy(ERC20PredicateProxy, '0x0000000000000000000000000000000000000000') await erc20PredicateProxy.updateAndCall(erc20Predicate.address, erc20Predicate.contract.methods.initialize(accounts[0]).encodeABI()) + // Mintable version of ERC20 👇 + const mintableErc20Predicate = await deployer.deploy(MintableERC20Predicate) + const mintableErc20PredicateProxy = await deployer.deploy(MintableERC20PredicateProxy, '0x0000000000000000000000000000000000000000') + await mintableErc20PredicateProxy.updateAndCall(mintableErc20Predicate.address, mintableErc20Predicate.contract.methods.initialize(accounts[0]).encodeABI()) + // -- ERC20 Predicates Deployment, ending + + // -- ERC721 Predicates Deployment, starting const erc721Predicate = await deployer.deploy(ERC721Predicate) const erc721PredicateProxy = await deployer.deploy(ERC721PredicateProxy, '0x0000000000000000000000000000000000000000') await erc721PredicateProxy.updateAndCall(erc721Predicate.address, erc721Predicate.contract.methods.initialize(accounts[0]).encodeABI()) + // Mintable version of ERC721 👇 const mintableERC721Predicate = await deployer.deploy(MintableERC721Predicate) const mintableERC721PredicateProxy = await deployer.deploy(MintableERC721PredicateProxy, '0x0000000000000000000000000000000000000000') await mintableERC721PredicateProxy.updateAndCall(mintableERC721Predicate.address, mintableERC721Predicate.contract.methods.initialize(accounts[0]).encodeABI()) + // -- ERC721 Predicates Deployment, ending + // -- ERC1155 Predicates Deployment, starting const erc1155Predicate = await deployer.deploy(ERC1155Predicate) const erc1155PredicateProxy = await deployer.deploy(ERC1155PredicateProxy, '0x0000000000000000000000000000000000000000') await erc1155PredicateProxy.updateAndCall(erc1155Predicate.address, erc1155Predicate.contract.methods.initialize(accounts[0]).encodeABI()) + // Mintable version of ERC1155 👇 + const mintableErc1155Predicate = await deployer.deploy(MintableERC1155Predicate) + const mintableErc1155PredicateProxy = await deployer.deploy(MintableERC1155PredicateProxy, '0x0000000000000000000000000000000000000000') + await mintableErc1155PredicateProxy.updateAndCall(mintableErc1155Predicate.address, mintableErc1155Predicate.contract.methods.initialize(accounts[0]).encodeABI()) + // -- ERC721 Predicates Deployment, ending + const etherPredicate = await deployer.deploy(EtherPredicate) const etherPredicateProxy = await deployer.deploy(EtherPredicateProxy, '0x0000000000000000000000000000000000000000') await etherPredicateProxy.updateAndCall(etherPredicate.address, etherPredicate.contract.methods.initialize(accounts[0]).encodeABI()) await deployer.deploy(DummyStateSender) + + // -- Dummy version of ERC20 await deployer.deploy(DummyERC20, 'Dummy ERC20', 'DERC20') + await deployer.deploy(DummyMintableERC20, 'Dummy Mintable ERC20', 'DERC20') + // -- ends + + // -- Dummy version of ERC721 await deployer.deploy(DummyERC721, 'Dummy ERC721', 'DERC721') await deployer.deploy(DummyMintableERC721, 'Dummy Mintable ERC721', 'DMERC721') - await deployer.deploy(DummyERC1155, 'Dummy ERC1155') + // -- ends + // -- Dummy version of ERC1155 + await deployer.deploy(DummyERC1155, 'Dummy ERC1155') + await deployer.deploy(DummyMintableERC1155, 'Dummy Mintable ERC1155') + // -- ends + const contractAddresses = utils.getContractAddresses() + contractAddresses.root.RootChainManager = RootChainManager.address contractAddresses.root.RootChainManagerProxy = RootChainManagerProxy.address + contractAddresses.root.DummyStateSender = DummyStateSender.address + contractAddresses.root.ERC20Predicate = ERC20Predicate.address contractAddresses.root.ERC20PredicateProxy = ERC20PredicateProxy.address + contractAddresses.root.MintableERC20Predicate = MintableERC20Predicate.address + contractAddresses.root.MintableERC20PredicateProxy = MintableERC20PredicateProxy.address + contractAddresses.root.ERC721Predicate = ERC721Predicate.address contractAddresses.root.ERC721PredicateProxy = ERC721PredicateProxy.address contractAddresses.root.MintableERC721Predicate = MintableERC721Predicate.address contractAddresses.root.MintableERC721PredicateProxy = MintableERC721PredicateProxy.address + contractAddresses.root.ERC1155Predicate = ERC1155Predicate.address - contractAddresses.root.ERC1155PredicateProxy = erc1155PredicateProxy.address + contractAddresses.root.ERC1155PredicateProxy = ERC1155PredicateProxy.address + contractAddresses.root.MintableERC1155Predicate = MintableERC1155Predicate.address + contractAddresses.root.MintableERC1155PredicateProxy = MintableERC1155PredicateProxy.address + contractAddresses.root.EtherPredicate = EtherPredicate.address contractAddresses.root.EtherPredicateProxy = EtherPredicateProxy.address + contractAddresses.root.DummyERC20 = DummyERC20.address + contractAddresses.root.DummyMintableERC20 = DummyMintableERC20.address + contractAddresses.root.DummyERC721 = DummyERC721.address contractAddresses.root.DummyMintableERC721 = DummyMintableERC721.address + contractAddresses.root.DummyERC1155 = DummyERC1155.address + contractAddresses.root.DummyMintableERC1155 = DummyMintableERC1155.address + utils.writeContractAddresses(contractAddresses) } diff --git a/migrations/3_deploy_child_chain_contracts.js b/migrations/3_deploy_child_chain_contracts.js index 4f319c36..c59f8bd7 100644 --- a/migrations/3_deploy_child_chain_contracts.js +++ b/migrations/3_deploy_child_chain_contracts.js @@ -1,9 +1,15 @@ const ChildChainManager = artifacts.require('ChildChainManager') const ChildChainManagerProxy = artifacts.require('ChildChainManagerProxy') + const ChildERC20 = artifacts.require('ChildERC20') +const ChildMintableERC20 = artifacts.require('ChildMintableERC20') + const ChildERC721 = artifacts.require('ChildERC721') const ChildMintableERC721 = artifacts.require('ChildMintableERC721') + const ChildERC1155 = artifacts.require('ChildERC1155') +const ChildMintableERC1155 = artifacts.require('ChildMintableERC1155') + const MaticWETH = artifacts.require('MaticWETH') const utils = require('./utils') @@ -14,19 +20,32 @@ module.exports = async(deployer, network, accounts) => { await childChainManagerProxy.updateAndCall(childChainManager.address, childChainManager.contract.methods.initialize(accounts[0]).encodeABI()) await deployer.deploy(ChildERC20, 'Dummy ERC20', 'DERC20', 18, ChildChainManagerProxy.address) + await deployer.deploy(ChildMintableERC20, 'Dummy Mintable ERC20', 'DMERC20', 18, ChildChainManagerProxy.address) + await deployer.deploy(ChildERC721, 'Dummy ERC721', 'DERC721', ChildChainManagerProxy.address) await deployer.deploy(ChildMintableERC721, 'Dummy Mintable ERC721', 'DMERC721', ChildChainManagerProxy.address) + await deployer.deploy(ChildERC1155, 'Dummy ERC1155', ChildChainManagerProxy.address) + await deployer.deploy(ChildMintableERC1155, 'Dummy Mintable ERC1155', ChildChainManagerProxy.address) + await deployer.deploy(MaticWETH, ChildChainManagerProxy.address) const contractAddresses = utils.getContractAddresses() + contractAddresses.child.ChildChainManager = ChildChainManager.address contractAddresses.child.ChildChainManagerProxy = ChildChainManagerProxy.address + contractAddresses.child.DummyERC20 = ChildERC20.address + contractAddresses.child.DummyMintableERC20 = ChildMintableERC20.address + contractAddresses.child.DummyERC721 = ChildERC721.address contractAddresses.child.DummyMintableERC721 = ChildMintableERC721.address + contractAddresses.child.DummyERC1155 = ChildERC1155.address + contractAddresses.child.DummyMintableERC1155 = ChildMintableERC1155.address + contractAddresses.child.MaticWETH = MaticWETH.address + utils.writeContractAddresses(contractAddresses) }) } diff --git a/migrations/4_initialize_root_chain_contracts.js b/migrations/4_initialize_root_chain_contracts.js index 6c5ca6a6..40128e8b 100644 --- a/migrations/4_initialize_root_chain_contracts.js +++ b/migrations/4_initialize_root_chain_contracts.js @@ -1,10 +1,19 @@ const RootChainManager = artifacts.require('RootChainManager') + const ERC20Predicate = artifacts.require('ERC20Predicate') +const MintableERC20Predicate = artifacts.require('MintableERC20Predicate') + const ERC721Predicate = artifacts.require('ERC721Predicate') const MintableERC721Predicate = artifacts.require('MintableERC721Predicate') + const ERC1155Predicate = artifacts.require('ERC1155Predicate') +const MintableERC1155Predicate = artifacts.require('MintableERC1155Predicate') + const EtherPredicate = artifacts.require('EtherPredicate') + +const DummyMintableERC20 = artifacts.require('DummyMintableERC20') const DummyMintableERC721 = artifacts.require('DummyMintableERC721') +const DummyMintableERC1155 = artifacts.require('DummyMintableERC1155') const utils = require('./utils') const config = require('./config') @@ -13,12 +22,21 @@ module.exports = async(deployer) => { const contractAddresses = utils.getContractAddresses() const RootChainManagerInstance = await RootChainManager.at(contractAddresses.root.RootChainManagerProxy) + const ERC20PredicateInstance = await ERC20Predicate.at(contractAddresses.root.ERC20PredicateProxy) + const MintableERC20PredicateInstance = await MintableERC20Predicate.at(contractAddresses.root.MintableERC20PredicateProxy) + const ERC721PredicateInstance = await ERC721Predicate.at(contractAddresses.root.ERC721PredicateProxy) const MintableERC721PredicateInstance = await MintableERC721Predicate.at(contractAddresses.root.MintableERC721PredicateProxy) + const ERC1155PredicateInstance = await ERC1155Predicate.at(contractAddresses.root.ERC1155PredicateProxy) + const MintableERC1155PredicateInstance = await MintableERC1155Predicate.at(contractAddresses.root.MintableERC1155PredicateProxy) + const EtherPredicateInstance = await EtherPredicate.at(contractAddresses.root.EtherPredicateProxy) + + const DummyMintableERC20Instance = await DummyMintableERC20.at(contractAddresses.root.DummyMintableERC20) const DummyMintableERC721Instance = await DummyMintableERC721.at(contractAddresses.root.DummyMintableERC721) + const DummyMintableERC1155Instance = await DummyMintableERC1155.at(contractAddresses.root.DummyMintableERC1155) console.log('Setting StateSender') await RootChainManagerInstance.setStateSender(contractAddresses.root.DummyStateSender) @@ -33,6 +51,9 @@ module.exports = async(deployer) => { const MANAGER_ROLE = await ERC20PredicateInstance.MANAGER_ROLE() await ERC20PredicateInstance.grantRole(MANAGER_ROLE, RootChainManagerInstance.address) + console.log('Granting manager role on MintableERC20Predicate') + await MintableERC20PredicateInstance.grantRole(MANAGER_ROLE, RootChainManagerInstance.address) + console.log('Granting manager role on ERC721Predicate') await ERC721PredicateInstance.grantRole(MANAGER_ROLE, RootChainManagerInstance.address) @@ -42,17 +63,31 @@ module.exports = async(deployer) => { console.log('Granting manager role on ERC71155Predicate') await ERC1155PredicateInstance.grantRole(MANAGER_ROLE, RootChainManagerInstance.address) + console.log('Granting manager role on MintableERC71155Predicate') + await MintableERC1155PredicateInstance.grantRole(MANAGER_ROLE, RootChainManagerInstance.address) + console.log('Granting manager role on EtherPredicate') await EtherPredicateInstance.grantRole(MANAGER_ROLE, RootChainManagerInstance.address) - console.log('Granting predicate role on dummyMintableERC721') - const PREDICATE_ROLE = await DummyMintableERC721Instance.PREDICATE_ROLE() + const PREDICATE_ROLE = await DummyMintableERC20Instance.PREDICATE_ROLE() + + console.log('Granting predicate role on DummyMintableERC20') + await DummyMintableERC20Instance.grantRole(PREDICATE_ROLE, MintableERC20PredicateInstance.address) + + console.log('Granting predicate role on DummyMintableERC721') await DummyMintableERC721Instance.grantRole(PREDICATE_ROLE, MintableERC721PredicateInstance.address) + console.log('Granting predicate role on DummyMintableERC1155') + await DummyMintableERC1155Instance.grantRole(PREDICATE_ROLE, MintableERC1155PredicateInstance.address) + console.log('Registering ERC20Predicate') const ERC20Type = await ERC20PredicateInstance.TOKEN_TYPE() await RootChainManagerInstance.registerPredicate(ERC20Type, ERC20PredicateInstance.address) + console.log('Registering MintableERC20Predicate') + const MintableERC20Type = await MintableERC20PredicateInstance.TOKEN_TYPE() + await RootChainManagerInstance.registerPredicate(MintableERC20Type, MintableERC20PredicateInstance.address) + console.log('Registering ERC721Predicate') const ERC721Type = await ERC721PredicateInstance.TOKEN_TYPE() await RootChainManagerInstance.registerPredicate(ERC721Type, ERC721PredicateInstance.address) @@ -65,6 +100,10 @@ module.exports = async(deployer) => { const ERC1155Type = await ERC1155PredicateInstance.TOKEN_TYPE() await RootChainManagerInstance.registerPredicate(ERC1155Type, ERC1155PredicateInstance.address) + console.log('Registering MintableERC1155Predicate') + const MintableERC1155Type = await MintableERC1155PredicateInstance.TOKEN_TYPE() + await RootChainManagerInstance.registerPredicate(MintableERC1155Type, MintableERC1155PredicateInstance.address) + console.log('Registering EtherPredicate') const EtherType = await EtherPredicateInstance.TOKEN_TYPE() await RootChainManagerInstance.registerPredicate(EtherType, EtherPredicateInstance.address) @@ -72,6 +111,9 @@ module.exports = async(deployer) => { console.log('Mapping DummyERC20') await RootChainManagerInstance.mapToken(contractAddresses.root.DummyERC20, contractAddresses.child.DummyERC20, ERC20Type) + console.log('Mapping DummyMintableERC20') + await RootChainManagerInstance.mapToken(contractAddresses.root.DummyMintableERC20, contractAddresses.child.DummyMintableERC20, MintableERC20Type) + console.log('Mapping DummyERC721') await RootChainManagerInstance.mapToken(contractAddresses.root.DummyERC721, contractAddresses.child.DummyERC721, ERC721Type) @@ -81,6 +123,9 @@ module.exports = async(deployer) => { console.log('Mapping DummyERC1155') await RootChainManagerInstance.mapToken(contractAddresses.root.DummyERC1155, contractAddresses.child.DummyERC1155, ERC1155Type) + console.log('Mapping DummyMintableERC1155') + await RootChainManagerInstance.mapToken(contractAddresses.root.DummyMintableERC1155, contractAddresses.child.DummyMintableERC1155, MintableERC1155Type) + console.log('Mapping Ether') await RootChainManagerInstance.mapToken('0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE', contractAddresses.child.MaticWETH, EtherType) } diff --git a/migrations/5_initialize_child_chain_contracts.js b/migrations/5_initialize_child_chain_contracts.js index 4e09a021..add9983f 100644 --- a/migrations/5_initialize_child_chain_contracts.js +++ b/migrations/5_initialize_child_chain_contracts.js @@ -1,9 +1,5 @@ const ChildChainManager = artifacts.require('ChildChainManager') -const ChildERC20 = artifacts.require('ChildERC20') -const ChildERC721 = artifacts.require('ChildERC721') -const ChildMintableERC721 = artifacts.require('ChildMintableERC721') -const ChildERC1155 = artifacts.require('ChildERC1155') -const MaticWETH = artifacts.require('MaticWETH') + const utils = require('./utils') const config = require('./config') @@ -11,28 +7,29 @@ module.exports = async(deployer) => { const contractAddresses = utils.getContractAddresses() const ChildChainManagerInstance = await ChildChainManager.at(contractAddresses.child.ChildChainManagerProxy) - const DummyERC20Instance = await ChildERC20.at(contractAddresses.child.DummyERC20) - const DummyERC721Instance = await ChildERC721.at(contractAddresses.child.DummyERC721) - const DummyMintableERC721Instance = await ChildMintableERC721.at(contractAddresses.child.DummyMintableERC721) - const DummyERC1155Instance = await ChildERC1155.at(contractAddresses.child.DummyERC1155) - const MaticWETHInstance = await MaticWETH.at(contractAddresses.child.MaticWETH) console.log('Granting STATE_SYNCER_ROLE on ChildChainManager') const STATE_SYNCER_ROLE = await ChildChainManagerInstance.STATE_SYNCER_ROLE() await ChildChainManagerInstance.grantRole(STATE_SYNCER_ROLE, config.stateReceiver) console.log('Mapping DummyERC20') - await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyERC20, DummyERC20Instance.address) + await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyERC20, contractAddresses.child.DummyERC20) + + console.log('Mapping DummyMintableERC20') + await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyMintableERC20, contractAddresses.child.DummyMintableERC20) console.log('Mapping DummyERC721') - await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyERC721, DummyERC721Instance.address) + await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyERC721, contractAddresses.child.DummyERC721) console.log('Mapping DummyMintableERC721') - await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyMintableERC721, DummyMintableERC721Instance.address) + await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyMintableERC721, contractAddresses.child.DummyMintableERC721) console.log('Mapping DummyERC1155') - await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyERC1155, DummyERC1155Instance.address) + await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyERC1155, contractAddresses.child.DummyERC1155) + + console.log('Mapping DummyMintableERC1155') + await ChildChainManagerInstance.mapToken(contractAddresses.root.DummyMintableERC1155, contractAddresses.child.DummyMintableERC1155) console.log('Mapping WETH') - await ChildChainManagerInstance.mapToken('0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE', MaticWETHInstance.address) + await ChildChainManagerInstance.mapToken('0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE', contractAddresses.child.MaticWETH) } diff --git a/package-lock.json b/package-lock.json index 2bab7c77..443d15e5 100644 --- a/package-lock.json +++ b/package-lock.json @@ -1,8 +1,16388 @@ { "name": "pos-portal", "version": "1.2.0", - "lockfileVersion": 1, + "lockfileVersion": 2, "requires": true, + "packages": { + "": { + "version": "1.2.0", + "license": "MIT", + "dependencies": { + "ganache-cli": "^6.9.1" + }, + "devDependencies": { + "@openzeppelin/contracts": "^3.1.0", + "@openzeppelin/test-helpers": "^0.5.5", + 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"https://registry.npmjs.org/which-module/-/which-module-2.0.0.tgz", + "integrity": "sha1-2e8H3Od7mQK4o6j6SzHD4/fm6Ho=", "bundled": true }, "wrap-ansi": { "version": "5.1.0", + "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-5.1.0.tgz", + "integrity": "sha512-QC1/iN/2/RPVJ5jYK8BGttj5z83LmSKmvbvrXPNCLZSEb32KKVDJDl/MOt2N01qU2H/FkzEa9PKto1BqDjtd7Q==", "bundled": true, "requires": { "ansi-styles": "^3.2.0", @@ -6584,14 +23130,20 @@ }, "wrappy": { "version": "1.0.2", + "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz", + "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=", "bundled": true }, "y18n": { "version": "4.0.0", + "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz", + "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w==", "bundled": true }, "yargs": { "version": "13.2.4", + "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.2.4.tgz", + "integrity": "sha512-HG/DWAJa1PAnHT9JAhNa8AbAv3FPaiLzioSjCcmuXXhP8MlpHO5vwls4g4j6n30Z74GVQj8Xa62dWVx1QCGklg==", "bundled": true, "requires": { "cliui": "^5.0.0", @@ -6609,6 +23161,8 @@ }, "yargs-parser": { "version": "13.1.1", + "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.1.tgz", + "integrity": "sha512-oVAVsHz6uFrg3XQheFII8ESO2ssAf9luWuAd6Wexsu4F3OtIW0o8IribPXYrD4WC24LWtPrJlGy87y5udK+dxQ==", "bundled": true, "requires": { "camelcase": "^5.0.0", @@ -8538,9 +25092,9 @@ } }, "moonwalker": { - "version": "github:atvanguard/moonwalker#4c4592e2d6c1744fbcd9452cf0f00e9beb236b21", - "from": "github:atvanguard/moonwalker#4c4592e2d6c1744fbcd9452cf0f00e9beb236b21", + "version": "git+ssh://git@github.com/atvanguard/moonwalker.git#4c4592e2d6c1744fbcd9452cf0f00e9beb236b21", "dev": true, + "from": "moonwalker@github:atvanguard/moonwalker#4c4592e2d6c1744fbcd9452cf0f00e9beb236b21", "requires": { "@types/node": "^12.7.7", "@types/web3": "^1.0.19", @@ -11383,6 +27937,23 @@ "integrity": "sha1-J5siXfHVgrH1TmWt3UNS4Y+qBxM=", "dev": true }, + "string_decoder": { + "version": "1.1.1", + "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz", + "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==", + "dev": true, + "requires": { + "safe-buffer": "~5.1.0" + }, + "dependencies": { + "safe-buffer": { + "version": "5.1.2", + "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz", + "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==", + "dev": true + } + } + }, "string-width": { "version": "4.2.0", "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.0.tgz", @@ -11442,23 +28013,6 @@ "es-abstract": "^1.17.5" } }, - "string_decoder": { - "version": "1.1.1", - "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz", - "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==", - "dev": true, - "requires": { - "safe-buffer": "~5.1.0" - }, - "dependencies": { - "safe-buffer": { - "version": "5.1.2", - "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz", - "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g==", - "dev": true - } - } - }, "strip-ansi": { "version": "3.0.1", "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz", @@ -13565,9 +30119,9 @@ } }, "websocket": { - "version": "github:web3-js/WebSocket-Node#ef5ea2f41daf4a2113b80c9223df884b4d56c400", - "from": "github:web3-js/WebSocket-Node#polyfill/globalThis", + "version": "git+ssh://git@github.com/web3-js/WebSocket-Node.git#ef5ea2f41daf4a2113b80c9223df884b4d56c400", "dev": true, + "from": "websocket@github:web3-js/WebSocket-Node#polyfill/globalThis", "requires": { "debug": "^2.2.0", "es5-ext": "^0.10.50", diff --git a/scripts/flatten-contracts.js b/scripts/flatten-contracts.js index 32bdd5d3..8d1b206a 100644 --- a/scripts/flatten-contracts.js +++ b/scripts/flatten-contracts.js @@ -18,6 +18,15 @@ const contractsToFlatten = [ path: 'contracts/root/TokenPredicates', fileName: 'ERC20PredicateProxy.sol' }, + { + path: 'contracts/root/TokenPredicates', + fileName: 'MintableERC20Predicate.sol' + }, + + { + path: 'contracts/root/TokenPredicates', + fileName: 'MintableERC20PredicateProxy.sol' + }, { path: 'contracts/root/TokenPredicates', fileName: 'ERC721Predicate.sol' @@ -42,6 +51,14 @@ const contractsToFlatten = [ path: 'contracts/root/TokenPredicates', fileName: 'ERC1155PredicateProxy.sol' }, + { + path: 'contracts/root/TokenPredicates', + fileName: 'MintableERC1155Predicate.sol' + }, + { + path: 'contracts/root/TokenPredicates', + fileName: 'MintableERC1155PredicateProxy.sol' + }, { path: 'contracts/root/TokenPredicates', fileName: 'EtherPredicate.sol' @@ -58,6 +75,10 @@ const contractsToFlatten = [ path: 'contracts/root/RootToken', fileName: 'DummyERC20.sol' }, + { + path: 'contracts/root/RootToken', + fileName: 'DummyMintableERC20.sol' + }, { path: 'contracts/root/RootToken', fileName: 'DummyERC721.sol' @@ -70,6 +91,10 @@ const contractsToFlatten = [ path: 'contracts/root/RootToken', fileName: 'DummyERC1155.sol' }, + { + path: 'contracts/root/RootToken', + fileName: 'DummyMintableERC1155.sol' + }, { path: 'contracts/child/ChildChainManager', fileName: 'ChildChainManager.sol' @@ -82,6 +107,10 @@ const contractsToFlatten = [ path: 'contracts/child/ChildToken', fileName: 'ChildERC20.sol' }, + { + path: 'contracts/child/ChildToken', + fileName: 'ChildMintableERC20.sol' + }, { path: 'contracts/child/ChildToken', fileName: 'ChildERC721.sol' @@ -94,6 +123,10 @@ const contractsToFlatten = [ path: 'contracts/child/ChildToken', fileName: 'ChildERC1155.sol' }, + { + path: 'contracts/child/ChildToken', + fileName: 'ChildMintableERC1155.sol' + }, { path: 'contracts/child/ChildToken', fileName: 'MaticWETH.sol' diff --git a/scripts/generate-artifacts.js b/scripts/generate-artifacts.js index b41844ba..260180f0 100644 --- a/scripts/generate-artifacts.js +++ b/scripts/generate-artifacts.js @@ -2,14 +2,18 @@ const fs = require('fs') const artifactsToGenerate = [ 'ChildChainManager.json', - 'ChildERC1155.json', 'ChildERC20.json', 'ChildERC721.json', + 'ChildERC1155.json', + 'ChildMintableERC20.json', 'ChildMintableERC721.json', - 'DummyERC1155.json', + 'ChildMintableERC1155.json', 'DummyERC20.json', 'DummyERC721.json', + 'DummyERC1155.json', + 'DummyMintableERC20.json', 'DummyMintableERC721.json', + 'DummyMintableERC1155.json', 'MaticWETH.json', 'RootChainManager.json', 'BaseRootTunnel.json', diff --git a/test/helpers/contracts.js b/test/helpers/contracts.js index 7ef523eb..bced9f99 100644 --- a/test/helpers/contracts.js +++ b/test/helpers/contracts.js @@ -9,18 +9,24 @@ const RootChainManagerProxy = artifacts.require('RootChainManagerProxy') const DummyStateSender = artifacts.require('DummyStateSender') const ERC20Predicate = artifacts.require('ERC20Predicate') const ERC20PredicateProxy = artifacts.require('ERC20PredicateProxy') +const MintableERC20Predicate = artifacts.require('MintableERC20Predicate') +const MintableERC20PredicateProxy = artifacts.require('MintableERC20PredicateProxy') const ERC721Predicate = artifacts.require('ERC721Predicate') const ERC721PredicateProxy = artifacts.require('ERC721PredicateProxy') const MintableERC721Predicate = artifacts.require('MintableERC721Predicate') const MintableERC721PredicateProxy = artifacts.require('MintableERC721PredicateProxy') const ERC1155Predicate = artifacts.require('ERC1155Predicate') const ERC1155PredicateProxy = artifacts.require('ERC1155PredicateProxy') +const MintableERC1155Predicate = artifacts.require('MintableERC1155Predicate') +const MintableERC1155PredicateProxy = artifacts.require('MintableERC1155PredicateProxy') const EtherPredicate = artifacts.require('EtherPredicate') const EtherPredicateProxy = artifacts.require('EtherPredicateProxy') const DummyERC20 = artifacts.require('DummyERC20') +const DummyMintableERC20 = artifacts.require('DummyMintableERC20') const DummyERC721 = artifacts.require('DummyERC721') const DummyMintableERC721 = artifacts.require('DummyMintableERC721') const DummyERC1155 = artifacts.require('DummyERC1155') +const DummyMintableERC1155 = artifacts.require('DummyMintableERC1155') const TestRootTunnel = artifacts.require('TestRootTunnel') const RootPotatoMigrator = artifacts.require('RootPotatoMigrator') const RootPotatoToken = artifacts.require('RootPotatoToken') @@ -28,6 +34,7 @@ const RootPotatoToken = artifacts.require('RootPotatoToken') const ChildChainManager = artifacts.require('ChildChainManager') const ChildChainManagerProxy = artifacts.require('ChildChainManagerProxy') const ChildERC20 = artifacts.require('ChildERC20') +const ChildMintableERC20 = artifacts.require('ChildMintableERC20') const UChildERC20 = artifacts.require('UChildERC20') const UChildERC20Proxy = artifacts.require('UChildERC20Proxy') const TestUChildERC20 = artifacts.require('TestUChildERC20') @@ -35,6 +42,7 @@ const UChildDAI = artifacts.require('UChildDAI') const ChildERC721 = artifacts.require('ChildERC721') const ChildMintableERC721 = artifacts.require('ChildMintableERC721') const ChildERC1155 = artifacts.require('ChildERC1155') +const ChildMintableERC1155 = artifacts.require('ChildMintableERC1155') const MaticWETH = artifacts.require('MaticWETH') const TestChildTunnel = artifacts.require('TestChildTunnel') const IStateReceiver = artifacts.require('IStateReceiver') @@ -63,18 +71,24 @@ setWeb3(RootChainManagerProxy, rootWeb3) setWeb3(DummyStateSender, rootWeb3) setWeb3(ERC20Predicate, rootWeb3) setWeb3(ERC20PredicateProxy, rootWeb3) +setWeb3(MintableERC20Predicate, rootWeb3) +setWeb3(MintableERC20PredicateProxy, rootWeb3) setWeb3(ERC721Predicate, rootWeb3) setWeb3(ERC721PredicateProxy, rootWeb3) setWeb3(MintableERC721Predicate, rootWeb3) setWeb3(MintableERC721PredicateProxy, rootWeb3) setWeb3(ERC1155Predicate, rootWeb3) setWeb3(ERC1155PredicateProxy, rootWeb3) +setWeb3(MintableERC1155Predicate, rootWeb3) +setWeb3(MintableERC1155PredicateProxy, rootWeb3) setWeb3(EtherPredicate, rootWeb3) setWeb3(EtherPredicateProxy, rootWeb3) setWeb3(DummyERC20, rootWeb3) +setWeb3(DummyMintableERC20, rootWeb3) setWeb3(DummyERC721, rootWeb3) setWeb3(DummyMintableERC721, rootWeb3) setWeb3(DummyERC1155, rootWeb3) +setWeb3(DummyMintableERC1155, rootWeb3) setWeb3(TestRootTunnel, rootWeb3) setWeb3(RootPotatoMigrator, rootWeb3) setWeb3(RootPotatoToken, rootWeb3) @@ -83,6 +97,7 @@ setWeb3(RootPotatoToken, rootWeb3) setWeb3(ChildChainManager, childWeb3) setWeb3(ChildChainManagerProxy, childWeb3) setWeb3(ChildERC20, childWeb3) +setWeb3(ChildMintableERC20, childWeb3) setWeb3(UChildERC20, childWeb3) setWeb3(UChildERC20Proxy, childWeb3) setWeb3(TestUChildERC20, childWeb3) @@ -90,6 +105,7 @@ setWeb3(UChildDAI, childWeb3) setWeb3(ChildERC721, childWeb3) setWeb3(ChildMintableERC721, childWeb3) setWeb3(ChildERC1155, childWeb3) +setWeb3(ChildMintableERC1155, childWeb3) setWeb3(MaticWETH, childWeb3) setWeb3(TestChildTunnel, childWeb3) setWeb3(IStateReceiver, childWeb3) @@ -104,18 +120,24 @@ export default { DummyStateSender, ERC20Predicate, ERC20PredicateProxy, + MintableERC20Predicate, + MintableERC20PredicateProxy, ERC721Predicate, ERC721PredicateProxy, MintableERC721Predicate, MintableERC721PredicateProxy, ERC1155Predicate, ERC1155PredicateProxy, + MintableERC1155Predicate, + MintableERC1155PredicateProxy, EtherPredicate, EtherPredicateProxy, DummyERC20, + DummyMintableERC20, DummyERC721, DummyMintableERC721, DummyERC1155, + DummyMintableERC1155, TestRootTunnel, RootPotatoMigrator, RootPotatoToken, @@ -123,6 +145,7 @@ export default { ChildChainManager, ChildChainManagerProxy, ChildERC20, + ChildMintableERC20, UChildERC20, UChildERC20Proxy, TestUChildERC20, @@ -130,6 +153,7 @@ export default { ChildERC721, ChildMintableERC721, ChildERC1155, + ChildMintableERC1155, MaticWETH, TestChildTunnel, IStateReceiver, diff --git a/test/helpers/deployer.js b/test/helpers/deployer.js index ddbd286b..fb89514c 100644 --- a/test/helpers/deployer.js +++ b/test/helpers/deployer.js @@ -7,27 +7,35 @@ export const deployFreshRootContracts = async(accounts) => { rootChainManagerLogic, dummyStateSender, erc20PredicateLogic, + mintableERC20PredicateLogic, erc721PredicateLogic, mintableERC721PredicateLogic, erc1155PredicateLogic, + mintableERC1155PredicateLogic, etherPredicateLogic, dummyERC20, + dummyMintableERC20, dummyERC721, dummyMintableERC721, - dummyERC1155 + dummyERC1155, + dummyMintableERC1155 ] = await Promise.all([ contracts.MockCheckpointManager.new(), contracts.RootChainManager.new(), contracts.DummyStateSender.new(), contracts.ERC20Predicate.new(), + contracts.MintableERC20Predicate.new(), contracts.ERC721Predicate.new(), contracts.MintableERC721Predicate.new(), contracts.ERC1155Predicate.new(), + contracts.MintableERC1155Predicate.new(), contracts.EtherPredicate.new(), contracts.DummyERC20.new('Dummy ERC20', 'DERC20'), + contracts.DummyMintableERC20.new('Dummy Mintable ERC20', 'DMERC20'), contracts.DummyERC721.new('Dummy ERC721', 'DERC721'), contracts.DummyMintableERC721.new('Dummy Mintable ERC721', 'DMERC721'), - contracts.DummyERC1155.new('Dummy ERC1155') + contracts.DummyERC1155.new('Dummy ERC1155'), + contracts.DummyMintableERC1155.new('Dummy Mintable ERC1155') ]) const rootChainManagerProxy = await contracts.RootChainManagerProxy.new('0x0000000000000000000000000000000000000000') @@ -38,6 +46,10 @@ export const deployFreshRootContracts = async(accounts) => { await erc20PredicateProxy.updateAndCall(erc20PredicateLogic.address, erc20PredicateLogic.contract.methods.initialize(accounts[0]).encodeABI()) const erc20Predicate = await contracts.ERC20Predicate.at(erc20PredicateProxy.address) + const mintableERC20PredicateProxy = await contracts.MintableERC20PredicateProxy.new('0x0000000000000000000000000000000000000000') + await mintableERC20PredicateProxy.updateAndCall(mintableERC20PredicateLogic.address, mintableERC20PredicateLogic.contract.methods.initialize(accounts[0]).encodeABI()) + const mintableERC20Predicate = await contracts.MintableERC20Predicate.at(mintableERC20PredicateProxy.address) + const erc721PredicateProxy = await contracts.ERC721PredicateProxy.new('0x0000000000000000000000000000000000000000') await erc721PredicateProxy.updateAndCall(erc721PredicateLogic.address, erc721PredicateLogic.contract.methods.initialize(accounts[0]).encodeABI()) const erc721Predicate = await contracts.ERC721Predicate.at(erc721PredicateProxy.address) @@ -50,6 +62,10 @@ export const deployFreshRootContracts = async(accounts) => { await erc1155PredicateProxy.updateAndCall(erc1155PredicateLogic.address, erc1155PredicateLogic.contract.methods.initialize(accounts[0]).encodeABI()) const erc1155Predicate = await contracts.ERC1155Predicate.at(erc1155PredicateProxy.address) + const mintableERC1155PredicateProxy = await contracts.MintableERC1155PredicateProxy.new('0x0000000000000000000000000000000000000000') + await mintableERC1155PredicateProxy.updateAndCall(mintableERC1155PredicateLogic.address, mintableERC1155PredicateLogic.contract.methods.initialize(accounts[0]).encodeABI()) + const mintableERC1155Predicate = await contracts.MintableERC1155Predicate.at(mintableERC1155PredicateProxy.address) + const etherPredicateProxy = await contracts.EtherPredicateProxy.new('0x0000000000000000000000000000000000000000') await etherPredicateProxy.updateAndCall(etherPredicateLogic.address, etherPredicateLogic.contract.methods.initialize(accounts[0]).encodeABI()) const etherPredicate = await contracts.EtherPredicate.at(etherPredicateProxy.address) @@ -59,14 +75,18 @@ export const deployFreshRootContracts = async(accounts) => { rootChainManager, dummyStateSender, erc20Predicate, + mintableERC20Predicate, erc721Predicate, mintableERC721Predicate, erc1155Predicate, + mintableERC1155Predicate, etherPredicate, dummyERC20, + dummyMintableERC20, dummyERC721, dummyMintableERC721, - dummyERC1155 + dummyERC1155, + dummyMintableERC1155 } } @@ -78,24 +98,30 @@ export const deployFreshChildContracts = async(accounts) => { const [ dummyERC20, + dummyMintableERC20, dummyERC721, dummyMintableERC721, dummyERC1155, + dummyMintableERC1155, maticWETH ] = await Promise.all([ contracts.ChildERC20.new('Dummy ERC20', 'DERC20', 18, childChainManager.address), + contracts.ChildMintableERC20.new('Dummy Mintable ERC20', 'DMERC20', 18, childChainManager.address), contracts.ChildERC721.new('Dummy ERC721', 'DERC721', childChainManager.address), contracts.ChildMintableERC721.new('Dummy Mintable ERC721', 'DMERC721', childChainManager.address), contracts.ChildERC1155.new('Dummy ERC1155', childChainManager.address), + contracts.ChildMintableERC1155.new('Dummy Mintable ERC1155', childChainManager.address), contracts.MaticWETH.new(childChainManager.address) ]) return { childChainManager, dummyERC20, + dummyMintableERC20, dummyERC721, dummyMintableERC721, dummyERC1155, + dummyMintableERC1155, maticWETH } } @@ -114,6 +140,7 @@ export const deployInitializedContracts = async(accounts) => { await root.rootChainManager.setChildChainManagerAddress(child.childChainManager.address) const MANAGER_ROLE = await root.erc20Predicate.MANAGER_ROLE() + const PREDICATE_ROLE = await root.dummyMintableERC20.PREDICATE_ROLE() const ERC20Type = await root.erc20Predicate.TOKEN_TYPE() await root.erc20Predicate.grantRole(MANAGER_ROLE, root.rootChainManager.address) @@ -121,6 +148,14 @@ export const deployInitializedContracts = async(accounts) => { await root.rootChainManager.mapToken(root.dummyERC20.address, child.dummyERC20.address, ERC20Type) await child.childChainManager.mapToken(root.dummyERC20.address, child.dummyERC20.address) + const MintableERC20Type = await root.mintableERC20Predicate.TOKEN_TYPE() + await root.mintableERC20Predicate.grantRole(MANAGER_ROLE, root.rootChainManager.address) + await root.rootChainManager.registerPredicate(MintableERC20Type, root.mintableERC20Predicate.address) + await root.rootChainManager.mapToken(root.dummyMintableERC20.address, child.dummyMintableERC20.address, MintableERC20Type) + await child.childChainManager.mapToken(root.dummyMintableERC20.address, child.dummyMintableERC20.address) + + await root.dummyMintableERC20.grantRole(PREDICATE_ROLE, root.mintableERC20Predicate.address) + const ERC721Type = await root.erc721Predicate.TOKEN_TYPE() await root.erc721Predicate.grantRole(MANAGER_ROLE, root.rootChainManager.address) await root.rootChainManager.registerPredicate(ERC721Type, root.erc721Predicate.address) @@ -133,7 +168,6 @@ export const deployInitializedContracts = async(accounts) => { await root.rootChainManager.mapToken(root.dummyMintableERC721.address, child.dummyMintableERC721.address, MintableERC721Type) await child.childChainManager.mapToken(root.dummyMintableERC721.address, child.dummyMintableERC721.address) - const PREDICATE_ROLE = await root.dummyMintableERC721.PREDICATE_ROLE() await root.dummyMintableERC721.grantRole(PREDICATE_ROLE, root.mintableERC721Predicate.address) const ERC1155Type = await root.erc1155Predicate.TOKEN_TYPE() @@ -142,6 +176,14 @@ export const deployInitializedContracts = async(accounts) => { await root.rootChainManager.mapToken(root.dummyERC1155.address, child.dummyERC1155.address, ERC1155Type) await child.childChainManager.mapToken(root.dummyERC1155.address, child.dummyERC1155.address) + const MintableERC1155Type = await root.mintableERC1155Predicate.TOKEN_TYPE() + await root.mintableERC1155Predicate.grantRole(MANAGER_ROLE, root.rootChainManager.address) + await root.rootChainManager.registerPredicate(MintableERC1155Type, root.mintableERC1155Predicate.address) + await root.rootChainManager.mapToken(root.dummyMintableERC1155.address, child.dummyMintableERC1155.address, MintableERC721Type) + await child.childChainManager.mapToken(root.dummyMintableERC1155.address, child.dummyMintableERC1155.address) + + await root.dummyMintableERC1155.grantRole(PREDICATE_ROLE, root.mintableERC1155Predicate.address) + const EtherType = await root.etherPredicate.TOKEN_TYPE() await root.etherPredicate.grantRole(MANAGER_ROLE, root.rootChainManager.address) await root.rootChainManager.registerPredicate(EtherType, root.etherPredicate.address) diff --git a/test/predicates/MintableERC1155Predicate.test.js b/test/predicates/MintableERC1155Predicate.test.js new file mode 100644 index 00000000..de8d40b4 --- /dev/null +++ b/test/predicates/MintableERC1155Predicate.test.js @@ -0,0 +1,578 @@ +import chai from 'chai' +import chaiAsPromised from 'chai-as-promised' +import chaiBN from 'chai-bn' +import BN from 'bn.js' +import { expectRevert } from '@openzeppelin/test-helpers' + +import * as deployer from '../helpers/deployer' +import { mockValues } from '../helpers/constants' +import logDecoder from '../helpers/log-decoder.js' +import { getERC1155TransferSingleLog, getERC1155TransferBatchLog } from '../helpers/logs' +import { constructERC1155DepositData } from '../helpers/utils' + +// Enable and inject BN dependency +chai + .use(chaiAsPromised) + .use(chaiBN(BN)) + .should() + +const should = chai.should() + +contract('MintableERC1155Predicate', (accounts) => { + describe('lockTokens', () => { + const tokenIdA = mockValues.numbers[2] + const tokenIdB = mockValues.numbers[7] + const amountA = mockValues.amounts[0] + const amountB = mockValues.amounts[1] + const depositReceiver = mockValues.addresses[7] + const depositor = accounts[1] + const depositData = constructERC1155DepositData([tokenIdA, tokenIdB], [amountA, amountB]) + + let dummyMintableERC1155 + let mintableERC1155Predicate + let lockTokensTx + let lockedLog + let oldAccountBalanceA + let oldAccountBalanceB + let oldContractBalanceA + let oldContractBalanceB + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC1155 = contracts.dummyMintableERC1155 + mintableERC1155Predicate = contracts.mintableERC1155Predicate + + const PREDICATE_ROLE = await dummyMintableERC1155.PREDICATE_ROLE() + await dummyMintableERC1155.grantRole(PREDICATE_ROLE, mintableERC1155Predicate.address) + + const burnLog = getERC1155TransferBatchLog({ + operator: depositor, + from: depositor, + to: mockValues.zeroAddress, + tokenIds: [tokenIdA, tokenIdB], + amounts: [amountA, amountB] + }) + + // because it's a mintable token, burning it first then + // brining it to root chain by making predicate contract mint it for us + await mintableERC1155Predicate.exitTokens(depositor, dummyMintableERC1155.address, burnLog) + await dummyMintableERC1155.setApprovalForAll(mintableERC1155Predicate.address, true, { from: depositor }) + + oldAccountBalanceA = await dummyMintableERC1155.balanceOf(depositor, tokenIdA) + oldAccountBalanceB = await dummyMintableERC1155.balanceOf(depositor, tokenIdB) + oldContractBalanceA = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdA) + oldContractBalanceB = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdB) + }) + + it('Depositor should have balance', () => { + amountA.should.be.a.bignumber.at.most(oldAccountBalanceA) + amountB.should.be.a.bignumber.at.most(oldAccountBalanceB) + }) + + it('Depositor should have approved token transfer', async () => { + const approved = await dummyMintableERC1155.isApprovedForAll(depositor, mintableERC1155Predicate.address) + approved.should.equal(true) + }) + + it('Should be able to receive lockTokens tx', async () => { + lockTokensTx = await mintableERC1155Predicate.lockTokens(depositor, depositReceiver, dummyMintableERC1155.address, depositData) + should.exist(lockTokensTx) + }) + + it('Should emit LockedBatchMintableERC1155 log', () => { + const logs = logDecoder.decodeLogs(lockTokensTx.receipt.rawLogs) + lockedLog = logs.find(l => l.event === 'LockedBatchMintableERC1155') + should.exist(lockedLog) + }) + + describe('Correct values should be emitted in LockedBatchMintableERC1155 log', () => { + it('Event should be emitted by correct contract', () => { + lockedLog.address.should.equal( + mintableERC1155Predicate.address.toLowerCase() + ) + }) + + it('Should emit proper depositor', () => { + lockedLog.args.depositor.should.equal(depositor) + }) + + it('Should emit proper deposit receiver', () => { + lockedLog.args.depositReceiver.should.equal(depositReceiver) + }) + + it('Should emit proper root token', () => { + lockedLog.args.rootToken.should.equal(dummyMintableERC1155.address) + }) + + it('Should emit proper token id for A', () => { + const id = lockedLog.args.ids[0].toNumber() + id.should.equal(tokenIdA) + }) + + it('Should emit proper token id for B', () => { + const id = lockedLog.args.ids[1].toNumber() + id.should.equal(tokenIdB) + }) + + it('Should emit proper amount for A', () => { + const amounts = lockedLog.args.amounts + const amount = new BN(amounts[0].toString()) + amount.should.be.a.bignumber.that.equals(amountA) + }) + + it('Should emit proper amount for B', () => { + const amounts = lockedLog.args.amounts + const amount = new BN(amounts[1].toString()) + amount.should.be.a.bignumber.that.equals(amountB) + }) + }) + + it('Deposit amount should be deducted from depositor account for A', async () => { + const newAccountBalance = await dummyMintableERC1155.balanceOf(depositor, tokenIdA) + newAccountBalance.should.be.a.bignumber.that.equals( + oldAccountBalanceA.sub(amountA) + ) + }) + + it('Deposit amount should be deducted from depositor account for B', async () => { + const newAccountBalance = await dummyMintableERC1155.balanceOf(depositor, tokenIdB) + newAccountBalance.should.be.a.bignumber.that.equals( + oldAccountBalanceB.sub(amountB) + ) + }) + + it('Deposit amount should be credited to correct contract for A', async () => { + const newContractBalance = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdA) + newContractBalance.should.be.a.bignumber.that.equals( + oldContractBalanceA.add(amountA) + ) + }) + + it('Deposit amount should be credited to correct contract for B', async () => { + const newContractBalance = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdB) + newContractBalance.should.be.a.bignumber.that.equals( + oldContractBalanceB.add(amountB) + ) + }) + }) + + describe('lockTokens called by non manager', () => { + const tokenId = mockValues.numbers[5] + const amount = mockValues.amounts[9] + const depositData = constructERC1155DepositData([tokenId], [amount]) + const depositor = accounts[1] + const depositReceiver = accounts[2] + let dummyMintableERC1155 + let mintableERC1155Predicate + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC1155 = contracts.dummyMintableERC1155 + mintableERC1155Predicate = contracts.mintableERC1155Predicate + + const PREDICATE_ROLE = await dummyMintableERC1155.PREDICATE_ROLE() + await dummyMintableERC1155.grantRole(PREDICATE_ROLE, mintableERC1155Predicate.address) + + const burnLog = getERC1155TransferBatchLog({ + operator: depositor, + from: depositor, + to: mockValues.zeroAddress, + tokenIds: [tokenId], + amounts: [amount] + }) + + await mintableERC1155Predicate.exitTokens(depositor, dummyMintableERC1155.address, burnLog) + await dummyMintableERC1155.setApprovalForAll(mintableERC1155Predicate.address, true, { from: depositor }) + }) + + it('Should revert with correct reason', async () => { + await expectRevert( + mintableERC1155Predicate.lockTokens(depositor, depositReceiver, dummyMintableERC1155.address, depositData, { from: depositor }), + 'MintableERC1155Predicate: INSUFFICIENT_PERMISSIONS') + }) + }) + + describe('exitTokens single', () => { + const amount = mockValues.amounts[9] + const tokenId = mockValues.numbers[4] + const depositData = constructERC1155DepositData([tokenId], [amount]) + const depositor = accounts[1] + const withdrawer = mockValues.addresses[8] + let dummyMintableERC1155 + let mintableERC1155Predicate + let exitTokensTx + let oldAccountBalance + let oldContractBalance + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC1155 = contracts.dummyMintableERC1155 + mintableERC1155Predicate = contracts.mintableERC1155Predicate + + const PREDICATE_ROLE = await dummyMintableERC1155.PREDICATE_ROLE() + await dummyMintableERC1155.grantRole(PREDICATE_ROLE, mintableERC1155Predicate.address) + + const burnLog = getERC1155TransferBatchLog({ + operator: depositor, + from: depositor, + to: mockValues.zeroAddress, + tokenIds: [tokenId], + amounts: [amount] + }) + + await mintableERC1155Predicate.exitTokens(depositor, dummyMintableERC1155.address, burnLog) + await dummyMintableERC1155.setApprovalForAll(mintableERC1155Predicate.address, true, { from: depositor }) + + await mintableERC1155Predicate.lockTokens(depositor, mockValues.addresses[2], dummyMintableERC1155.address, depositData) + oldAccountBalance = await dummyMintableERC1155.balanceOf(withdrawer, tokenId) + oldContractBalance = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenId) + }) + + it('Predicate should have the token', async () => { + amount.should.be.a.bignumber.at.most(oldContractBalance) + }) + + it('Should be able to receive exitTokens tx', async () => { + const burnLog = getERC1155TransferSingleLog({ + operator: withdrawer, + from: withdrawer, + to: mockValues.zeroAddress, + tokenId: tokenId, + amount: amount + }) + exitTokensTx = await mintableERC1155Predicate.exitTokens(withdrawer, dummyMintableERC1155.address, burnLog) + should.exist(exitTokensTx) + }) + + it('Withdaw amount should be deducted from contract', async () => { + const newContractBalance = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenId) + newContractBalance.should.be.a.bignumber.that.equals( + oldContractBalance.sub(amount) + ) + }) + + it('Withdraw amount should be credited to withdrawer', async () => { + const newAccountBalance = await dummyMintableERC1155.balanceOf(withdrawer, tokenId) + newAccountBalance.should.be.a.bignumber.that.equals( + oldAccountBalance.add(amount) + ) + }) + }) + + describe('exitTokens batch', () => { + const amountA = mockValues.amounts[9] + const amountB = mockValues.amounts[8] + + const tokenIdA = mockValues.numbers[4] + const tokenIdB = mockValues.numbers[5] + + const depositData = constructERC1155DepositData([tokenIdA, tokenIdB], [amountA, amountB]) + const depositor = accounts[1] + const withdrawer = mockValues.addresses[8] + + let dummyMintableERC1155 + let mintableERC1155Predicate + let exitTokensTx + let oldAccountBalanceA + let oldAccountBalanceB + let oldContractBalanceA + let oldContractBalanceB + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC1155 = contracts.dummyMintableERC1155 + mintableERC1155Predicate = contracts.mintableERC1155Predicate + + const PREDICATE_ROLE = await dummyMintableERC1155.PREDICATE_ROLE() + await dummyMintableERC1155.grantRole(PREDICATE_ROLE, mintableERC1155Predicate.address) + + const burnLog = getERC1155TransferBatchLog({ + operator: depositor, + from: depositor, + to: mockValues.zeroAddress, + tokenIds: [tokenIdA, tokenIdB], + amounts: [amountA, amountB] + }) + + await mintableERC1155Predicate.exitTokens(depositor, dummyMintableERC1155.address, burnLog) + await dummyMintableERC1155.setApprovalForAll(mintableERC1155Predicate.address, true, { from: depositor }) + + await mintableERC1155Predicate.lockTokens(depositor, mockValues.addresses[2], dummyMintableERC1155.address, depositData) + + oldAccountBalanceA = await dummyMintableERC1155.balanceOf(withdrawer, tokenIdA) + oldAccountBalanceB = await dummyMintableERC1155.balanceOf(withdrawer, tokenIdB) + + oldContractBalanceA = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdA) + oldContractBalanceB = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdB) + }) + + it('Predicate should have the token balances', async () => { + amountA.should.be.a.bignumber.at.most(oldContractBalanceA) + amountB.should.be.a.bignumber.at.most(oldContractBalanceB) + }) + + it('Should be able to receive exitTokens tx', async () => { + const burnLog = getERC1155TransferBatchLog({ + operator: withdrawer, + from: withdrawer, + to: mockValues.zeroAddress, + tokenIds: [tokenIdA, tokenIdB], + amounts: [amountA, amountB] + }) + exitTokensTx = await mintableERC1155Predicate.exitTokens(withdrawer, dummyMintableERC1155.address, burnLog) + should.exist(exitTokensTx) + }) + + it('Withdaw amount should be deducted from contract for A', async () => { + const newContractBalance = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdA) + newContractBalance.should.be.a.bignumber.that.equals( + oldContractBalanceA.sub(amountA) + ) + }) + + it('Withdaw amount should be deducted from contract for B', async () => { + const newContractBalance = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdB) + newContractBalance.should.be.a.bignumber.that.equals( + oldContractBalanceB.sub(amountB) + ) + }) + + it('Withdraw amount should be credited to withdrawer for A', async () => { + const newAccountBalance = await dummyMintableERC1155.balanceOf(withdrawer, tokenIdA) + newAccountBalance.should.be.a.bignumber.that.equals( + oldAccountBalanceA.add(amountA) + ) + }) + + it('Withdraw amount should be credited to withdrawer for B', async () => { + const newAccountBalance = await dummyMintableERC1155.balanceOf(withdrawer, tokenIdB) + newAccountBalance.should.be.a.bignumber.that.equals( + oldAccountBalanceB.add(amountB) + ) + }) + }) + + describe('exitTokens called by different user', () => { + const amountA = mockValues.amounts[9] + const amountB = mockValues.amounts[8] + + const tokenIdA = mockValues.numbers[4] + const tokenIdB = mockValues.numbers[5] + + const depositData = constructERC1155DepositData([tokenIdA, tokenIdB], [amountA, amountB]) + const depositor = accounts[1] + const withdrawer = mockValues.addresses[8] + const exitCaller = mockValues.addresses[5] + + let dummyMintableERC1155 + let mintableERC1155Predicate + let exitTokensTx + let oldAccountBalanceA + let oldAccountBalanceB + let oldContractBalanceA + let oldContractBalanceB + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC1155 = contracts.dummyMintableERC1155 + mintableERC1155Predicate = contracts.mintableERC1155Predicate + + const PREDICATE_ROLE = await dummyMintableERC1155.PREDICATE_ROLE() + await dummyMintableERC1155.grantRole(PREDICATE_ROLE, mintableERC1155Predicate.address) + + const burnLog = getERC1155TransferBatchLog({ + operator: depositor, + from: depositor, + to: mockValues.zeroAddress, + tokenIds: [tokenIdA, tokenIdB], + amounts: [amountA, amountB] + }) + + await mintableERC1155Predicate.exitTokens(depositor, dummyMintableERC1155.address, burnLog) + await dummyMintableERC1155.setApprovalForAll(mintableERC1155Predicate.address, true, { from: depositor }) + + await mintableERC1155Predicate.lockTokens(depositor, mockValues.addresses[2], dummyMintableERC1155.address, depositData) + + oldAccountBalanceA = await dummyMintableERC1155.balanceOf(withdrawer, tokenIdA) + oldAccountBalanceB = await dummyMintableERC1155.balanceOf(withdrawer, tokenIdB) + + oldContractBalanceA = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdA) + oldContractBalanceB = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdB) + }) + + it('Should be able to receive exitTokens tx', async () => { + const burnLog = getERC1155TransferBatchLog({ + operator: withdrawer, + from: withdrawer, + to: mockValues.zeroAddress, + tokenIds: [tokenIdA, tokenIdB], + amounts: [amountA, amountB] + }) + exitTokensTx = await mintableERC1155Predicate.exitTokens(exitCaller, dummyMintableERC1155.address, burnLog) + should.exist(exitTokensTx) + }) + + it('Withdaw amount should be deducted from contract for A', async () => { + const newContractBalance = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdA) + newContractBalance.should.be.a.bignumber.that.equals( + oldContractBalanceA.sub(amountA) + ) + }) + + it('Withdaw amount should be deducted from contract for B', async () => { + const newContractBalance = await dummyMintableERC1155.balanceOf(mintableERC1155Predicate.address, tokenIdB) + newContractBalance.should.be.a.bignumber.that.equals( + oldContractBalanceB.sub(amountB) + ) + }) + + it('Withdraw amount should be credited to withdrawer for A', async () => { + const newAccountBalance = await dummyMintableERC1155.balanceOf(withdrawer, tokenIdA) + newAccountBalance.should.be.a.bignumber.that.equals( + oldAccountBalanceA.add(amountA) + ) + }) + + it('Withdraw amount should be credited to withdrawer for B', async () => { + const newAccountBalance = await dummyMintableERC1155.balanceOf(withdrawer, tokenIdB) + newAccountBalance.should.be.a.bignumber.that.equals( + oldAccountBalanceB.add(amountB) + ) + }) + }) + + describe('exitTokens with incorrect burn transaction signature', () => { + const amount = mockValues.amounts[9] + const tokenId = mockValues.numbers[4] + const depositData = constructERC1155DepositData([tokenId], [amount]) + const depositor = accounts[1] + const withdrawer = mockValues.addresses[8] + + let dummyMintableERC1155 + let mintableERC1155Predicate + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC1155 = contracts.dummyMintableERC1155 + mintableERC1155Predicate = contracts.mintableERC1155Predicate + + const PREDICATE_ROLE = await dummyMintableERC1155.PREDICATE_ROLE() + await dummyMintableERC1155.grantRole(PREDICATE_ROLE, mintableERC1155Predicate.address) + + const burnLog = getERC1155TransferBatchLog({ + operator: depositor, + from: depositor, + to: mockValues.zeroAddress, + tokenIds: [tokenId], + amounts: [amount] + }) + + await mintableERC1155Predicate.exitTokens(depositor, dummyMintableERC1155.address, burnLog) + await dummyMintableERC1155.setApprovalForAll(mintableERC1155Predicate.address, true, { from: depositor }) + + await mintableERC1155Predicate.lockTokens(depositor, mockValues.addresses[2], dummyMintableERC1155.address, depositData) + }) + + it('Should revert with correct reason', async () => { + const burnLog = getERC1155TransferSingleLog({ + overrideSig: mockValues.bytes32[2], + operator: withdrawer, + from: withdrawer, + to: mockValues.zeroAddress, + tokenId: tokenId, + amount: amount + }) + await expectRevert(mintableERC1155Predicate.exitTokens(withdrawer, dummyMintableERC1155.address, burnLog), 'MintableERC1155Predicate: INVALID_WITHDRAW_SIG') + }) + }) + + describe('exitTokens called using normal transfer log instead of burn', () => { + const amount = mockValues.amounts[9] + const tokenId = mockValues.numbers[4] + const depositData = constructERC1155DepositData([tokenId], [amount]) + const depositor = accounts[1] + const withdrawer = mockValues.addresses[8] + + let dummyMintableERC1155 + let mintableERC1155Predicate + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC1155 = contracts.dummyMintableERC1155 + mintableERC1155Predicate = contracts.mintableERC1155Predicate + + const PREDICATE_ROLE = await dummyMintableERC1155.PREDICATE_ROLE() + await dummyMintableERC1155.grantRole(PREDICATE_ROLE, mintableERC1155Predicate.address) + + const burnLog = getERC1155TransferBatchLog({ + operator: depositor, + from: depositor, + to: mockValues.zeroAddress, + tokenIds: [tokenId], + amounts: [amount] + }) + + await mintableERC1155Predicate.exitTokens(depositor, dummyMintableERC1155.address, burnLog) + await dummyMintableERC1155.setApprovalForAll(mintableERC1155Predicate.address, true, { from: depositor }) + + await mintableERC1155Predicate.lockTokens(depositor, mockValues.addresses[2], dummyMintableERC1155.address, depositData) + }) + + it('Should revert with correct reason', async () => { + const burnLog = getERC1155TransferSingleLog({ + operator: withdrawer, + from: withdrawer, + to: mockValues.addresses[8], + tokenId: tokenId, + amount: amount + }) + await expectRevert(mintableERC1155Predicate.exitTokens(withdrawer, dummyMintableERC1155.address, burnLog), 'MintableERC1155Predicate: INVALID_RECEIVER') + }) + }) + + describe('exitTokens called by non manager', () => { + const amount = mockValues.amounts[9] + const tokenId = mockValues.numbers[4] + const depositData = constructERC1155DepositData([tokenId], [amount]) + const depositor = accounts[1] + const withdrawer = mockValues.addresses[8] + + let dummyMintableERC1155 + let mintableERC1155Predicate + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC1155 = contracts.dummyMintableERC1155 + mintableERC1155Predicate = contracts.mintableERC1155Predicate + + const PREDICATE_ROLE = await dummyMintableERC1155.PREDICATE_ROLE() + await dummyMintableERC1155.grantRole(PREDICATE_ROLE, mintableERC1155Predicate.address) + + const burnLog = getERC1155TransferBatchLog({ + operator: depositor, + from: depositor, + to: mockValues.zeroAddress, + tokenIds: [tokenId], + amounts: [amount] + }) + + await mintableERC1155Predicate.exitTokens(depositor, dummyMintableERC1155.address, burnLog) + await dummyMintableERC1155.setApprovalForAll(mintableERC1155Predicate.address, true, { from: depositor }) + + await mintableERC1155Predicate.lockTokens(depositor, mockValues.addresses[2], dummyMintableERC1155.address, depositData) + }) + + it('Should revert with correct reason', async () => { + const burnLog = getERC1155TransferSingleLog({ + operator: withdrawer, + from: withdrawer, + to: mockValues.zeroAddress, + tokenId: tokenId, + amount: amount + }) + await expectRevert( + mintableERC1155Predicate.exitTokens(withdrawer, dummyMintableERC1155.address, burnLog, { from: accounts[2] }), + 'MintableERC1155Predicate: INSUFFICIENT_PERMISSIONS') + }) + }) +}) diff --git a/test/predicates/MintableERC20Predicate.test.js b/test/predicates/MintableERC20Predicate.test.js new file mode 100644 index 00000000..2f27dddd --- /dev/null +++ b/test/predicates/MintableERC20Predicate.test.js @@ -0,0 +1,352 @@ +import chai from 'chai' +import chaiAsPromised from 'chai-as-promised' +import chaiBN from 'chai-bn' +import BN from 'bn.js' +import { AbiCoder } from 'ethers/utils' +import { expectRevert } from '@openzeppelin/test-helpers' + +import * as deployer from '../helpers/deployer' +import { mockValues } from '../helpers/constants' +import logDecoder from '../helpers/log-decoder.js' +import { getERC20TransferLog } from '../helpers/logs' + +// Enable and inject BN dependency +chai + .use(chaiAsPromised) + .use(chaiBN(BN)) + .should() + +const should = chai.should() +const abi = new AbiCoder() + +contract('MintableERC20Predicate', (accounts) => { + describe('lockTokens', () => { + const depositAmount = mockValues.amounts[4] + const depositReceiver = mockValues.addresses[7] + const depositor = accounts[1] + + let dummyMintableERC20 + let mintableERC20Predicate + let oldAccountBalance + let oldContractBalance + let lockTokensTx + let lockedLog + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC20 = contracts.dummyMintableERC20 + mintableERC20Predicate = contracts.mintableERC20Predicate + + const PREDICATE_ROLE = await dummyMintableERC20.PREDICATE_ROLE() + await dummyMintableERC20.grantRole(PREDICATE_ROLE, mintableERC20Predicate.address) + + const burnLog = getERC20TransferLog({ + from: depositor, + to: mockValues.zeroAddress, + amount: depositAmount + }) + // because it's a mintable ERC20, we're first going to exit it and + // predicate will mint that much amount for us and send it back + // to `depositor`, which is going to be approved to predicate, so that + // it can get it transferred to itself + await mintableERC20Predicate.exitTokens(depositor, dummyMintableERC20.address, burnLog) + await dummyMintableERC20.approve(mintableERC20Predicate.address, depositAmount, { from: depositor }) + + oldAccountBalance = await dummyMintableERC20.balanceOf(depositor) + oldContractBalance = await dummyMintableERC20.balanceOf(mintableERC20Predicate.address) + }) + + it('Depositor should have proper balance', () => { + depositAmount.should.be.a.bignumber.at.most(oldAccountBalance) + }) + + it('Depositor should have approved proper amount', async () => { + const allowance = await dummyMintableERC20.allowance(depositor, mintableERC20Predicate.address) + allowance.should.be.a.bignumber.that.equals(depositAmount) + }) + + it('Should be able to receive lockTokens tx', async () => { + const depositData = abi.encode(['uint256'], [depositAmount.toString()]) + lockTokensTx = await mintableERC20Predicate.lockTokens(depositor, depositReceiver, dummyMintableERC20.address, depositData) + should.exist(lockTokensTx) + }) + + it('Should emit LockedMintableERC20 log', () => { + const logs = logDecoder.decodeLogs(lockTokensTx.receipt.rawLogs) + lockedLog = logs.find(l => l.event === 'LockedMintableERC20') + should.exist(lockedLog) + }) + + describe('Correct values should be emitted in LockedMintableERC20 log', () => { + it('Event should be emitted by correct contract', () => { + lockedLog.address.should.equal( + mintableERC20Predicate.address.toLowerCase() + ) + }) + + it('Should emit proper depositor', () => { + lockedLog.args.depositor.should.equal(depositor) + }) + + it('Should emit correct deposit receiver', () => { + lockedLog.args.depositReceiver.should.equal(depositReceiver) + }) + + it('Should emit correct root token', () => { + lockedLog.args.rootToken.should.equal(dummyMintableERC20.address) + }) + + it('Should emit correct amount', () => { + const lockedLogAmount = new BN(lockedLog.args.amount.toString()) + lockedLogAmount.should.be.bignumber.that.equals(depositAmount) + }) + }) + + it('Deposit amount should be deducted from depositor account', async () => { + const newAccountBalance = await dummyMintableERC20.balanceOf(depositor) + newAccountBalance.should.be.a.bignumber.that.equals( + oldAccountBalance.sub(depositAmount) + ) + }) + + it('Deposit amount should be credited to correct contract', async () => { + const newContractBalance = await dummyMintableERC20.balanceOf(mintableERC20Predicate.address) + newContractBalance.should.be.a.bignumber.that.equals( + oldContractBalance.add(depositAmount) + ) + }) + }) + + describe('lockTokens called by non manager', () => { + const depositAmount = mockValues.amounts[3] + const depositor = accounts[1] + const depositReceiver = accounts[2] + const depositData = abi.encode(['uint256'], [depositAmount.toString()]) + let dummyMintableERC20 + let mintableERC20Predicate + + before(async () => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC20 = contracts.dummyMintableERC20 + mintableERC20Predicate = contracts.mintableERC20Predicate + + const PREDICATE_ROLE = await dummyMintableERC20.PREDICATE_ROLE() + await dummyMintableERC20.grantRole(PREDICATE_ROLE, mintableERC20Predicate.address) + + const burnLog = getERC20TransferLog({ + from: depositor, + to: mockValues.zeroAddress, + amount: depositAmount + }) + await mintableERC20Predicate.exitTokens(depositor, dummyMintableERC20.address, burnLog) + await dummyMintableERC20.approve(mintableERC20Predicate.address, depositAmount, { from: depositor }) + + await dummyMintableERC20.approve(mintableERC20Predicate.address, depositAmount, { from: depositor }) + }) + + it('Should revert with correct reason', async () => { + await expectRevert( + mintableERC20Predicate.lockTokens(depositor, depositReceiver, dummyMintableERC20.address, depositData, { from: depositor }), + 'MintableERC20Predicate: INSUFFICIENT_PERMISSIONS') + }) + }) + + describe('exitTokens by Alice then deposit back and exitTokens for second time by Bob', () => { + const amount = mockValues.amounts[2] + const alice = accounts[2] + const bob = mockValues.addresses[8] + + let dummyMintableERC20 + let mintableERC20Predicate + let exitTokensTx + + before(async() => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC20 = contracts.dummyMintableERC20 + mintableERC20Predicate = contracts.mintableERC20Predicate + + const PREDICATE_ROLE = await dummyMintableERC20.PREDICATE_ROLE() + await dummyMintableERC20.grantRole(PREDICATE_ROLE, mintableERC20Predicate.address) + }) + + it('Predicate should have 0 balance', async() => { + (await dummyMintableERC20.balanceOf(mintableERC20Predicate.address)).should.be.a.bignumber.equals(new BN(0)) + }) + + it('Alice should be able to send exitTokens tx', async() => { + const burnLog = getERC20TransferLog({ + from: alice, + to: mockValues.zeroAddress, + amount: amount + }) + exitTokensTx = await mintableERC20Predicate.exitTokens(alice, dummyMintableERC20.address, burnLog) + should.exist(exitTokensTx) + }) + + it('Amount should be minted for Alice', async() => { + (await dummyMintableERC20.balanceOf(alice)).should.be.a.bignumber.equals(amount) + }) + + it('Alice should be able to deposit amount back', async() => { + await dummyMintableERC20.approve(mintableERC20Predicate.address, amount, { from: alice }) + const depositData = abi.encode(['uint256'], [amount.toString()]) + const lockTokensTx = await mintableERC20Predicate.lockTokens(alice, alice, dummyMintableERC20.address, depositData) + should.exist(lockTokensTx) + }) + + it('Amount should be transfered to mintableERC20Predicate', async() => { + (await dummyMintableERC20.balanceOf(mintableERC20Predicate.address)).should.be.a.bignumber.equals(amount) + }) + + it('Bob should be able to send exitTokens tx', async() => { + const burnLog = getERC20TransferLog({ + from: bob, + to: mockValues.zeroAddress, + amount: amount + }) + exitTokensTx = await mintableERC20Predicate.exitTokens(bob, dummyMintableERC20.address, burnLog) + should.exist(exitTokensTx) + }) + + it('Amount should be transfered to Bob', async() => { + (await dummyMintableERC20.balanceOf(bob)).should.be.a.bignumber.equals(amount) + }) + }) + + describe('exitTokens called by different user', () => { + const amount = mockValues.amounts[2] + const alice = accounts[2] + const bob = mockValues.addresses[8] + const exitCaller = mockValues.addresses[3] + + let dummyMintableERC20 + let mintableERC20Predicate + let exitTokensTx + + before(async() => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC20 = contracts.dummyMintableERC20 + mintableERC20Predicate = contracts.mintableERC20Predicate + + const PREDICATE_ROLE = await dummyMintableERC20.PREDICATE_ROLE() + await dummyMintableERC20.grantRole(PREDICATE_ROLE, mintableERC20Predicate.address) + }) + + it('exitCaller should be able to send exitTokens tx', async() => { + const burnLog = getERC20TransferLog({ + from: alice, + to: mockValues.zeroAddress, + amount: amount + }) + exitTokensTx = await mintableERC20Predicate.exitTokens(exitCaller, dummyMintableERC20.address, burnLog) + should.exist(exitTokensTx) + }) + + it('Amount should be minted for alice', async() => { + (await dummyMintableERC20.balanceOf(alice)).should.be.a.bignumber.equals(amount) + }) + + it('Alice should be able to deposit token back', async() => { + await dummyMintableERC20.approve(mintableERC20Predicate.address, amount, { from: alice }) + const depositData = abi.encode(['uint256'], [amount.toString()]) + const lockTokensTx = await mintableERC20Predicate.lockTokens(alice, alice, dummyMintableERC20.address, depositData) + should.exist(lockTokensTx) + }) + + it('Amount should be transfered to mintableERC20Predicate', async() => { + (await dummyMintableERC20.balanceOf(mintableERC20Predicate.address)).should.be.a.bignumber.equals(amount) + }) + + it('exitCaller should be able to send exitTokens tx', async() => { + const burnLog = getERC20TransferLog({ + from: bob, + to: mockValues.zeroAddress, + amount: amount + }) + exitTokensTx = await mintableERC20Predicate.exitTokens(exitCaller, dummyMintableERC20.address, burnLog) + should.exist(exitTokensTx) + }) + + it('Token should be transfered to bob', async() => { + (await dummyMintableERC20.balanceOf(bob)).should.be.a.bignumber.equals(amount) + }) + }) + + describe('exitTokens with incorrect burn transaction signature', () => { + const amount = mockValues.amounts[2] + const withdrawer = mockValues.addresses[8] + let dummyMintableERC20 + let mintableERC20Predicate + + before(async() => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC20 = contracts.dummyMintableERC20 + mintableERC20Predicate = contracts.mintableERC20Predicate + + const PREDICATE_ROLE = await dummyMintableERC20.PREDICATE_ROLE() + await dummyMintableERC20.grantRole(PREDICATE_ROLE, mintableERC20Predicate.address) + }) + + it('Should revert with correct reason', async() => { + const burnLog = getERC20TransferLog({ + overrideSig: mockValues.bytes32[2], + from: withdrawer, + to: mockValues.zeroAddress, + amount: amount + }) + await expectRevert(mintableERC20Predicate.exitTokens(withdrawer, dummyMintableERC20.address, burnLog), 'MintableERC20Predicate: INVALID_SIGNATURE') + }) + }) + + describe('exitTokens called using normal transfer log instead of burn', () => { + const amount = mockValues.amounts[2] + const withdrawer = mockValues.addresses[8] + let dummyMintableERC20 + let mintableERC20Predicate + + before(async() => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC20 = contracts.dummyMintableERC20 + mintableERC20Predicate = contracts.mintableERC20Predicate + + const PREDICATE_ROLE = await dummyMintableERC20.PREDICATE_ROLE() + await dummyMintableERC20.grantRole(PREDICATE_ROLE, mintableERC20Predicate.address) + }) + + it('Should revert with correct reason', async() => { + const burnLog = getERC20TransferLog({ + from: withdrawer, + to: mockValues.addresses[8], + amount: amount + }) + await expectRevert(mintableERC20Predicate.exitTokens(withdrawer, dummyMintableERC20.address, burnLog), 'MintableERC20Predicate: INVALID_RECEIVER') + }) + }) + + describe('exitTokens called by non manager', () => { + const amount = mockValues.amounts[2] + const withdrawer = mockValues.addresses[8] + let dummyMintableERC20 + let mintableERC20Predicate + + before(async() => { + const contracts = await deployer.deployFreshRootContracts(accounts) + dummyMintableERC20 = contracts.dummyMintableERC20 + mintableERC20Predicate = contracts.mintableERC20Predicate + + const PREDICATE_ROLE = await dummyMintableERC20.PREDICATE_ROLE() + await dummyMintableERC20.grantRole(PREDICATE_ROLE, mintableERC20Predicate.address) + }) + + it('Should revert with correct reason', async() => { + const burnLog = getERC20TransferLog({ + from: withdrawer, + to: mockValues.addresses[8], + amount: amount + }) + await expectRevert( + mintableERC20Predicate.exitTokens(withdrawer, dummyMintableERC20.address, burnLog, { from: accounts[2] }), + 'MintableERC20Predicate: INSUFFICIENT_PERMISSIONS') + }) + }) +})