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utility.js
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utility.js
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/* eslint-env browser */
/* eslint no-console: ["error", { allow: ["log"] }] */
const fs = require('fs');
const request = require('request');
const async = typeof window === 'undefined' ? require('async') : require('async/dist/async.min.js');
const Web3 = require('web3');
const SolidityFunction = require('web3/lib/web3/function.js');
const SolidityEvent = require('web3/lib/web3/event.js');
const coder = require('web3/lib/solidity/coder.js');
const utils = require('web3/lib/utils/utils.js');
const sha3 = require('web3/lib/utils/sha3.js');
const Tx = require('ethereumjs-tx');
const keythereum = require('keythereum');
const ethUtil = require('ethereumjs-util');
const BigNumber = require('bignumber.js');
module.exports = (config) => {
const utility = {};
utility.weiToEth = function weiToEth(wei, divisorIn) {
const divisor = !divisorIn ? 1000000000000000000 : divisorIn;
return (wei / divisor).toFixed(3);
};
utility.ethToWei = function ethToWei(eth, divisorIn) {
const divisor = !divisorIn ? 1000000000000000000 : divisorIn;
return parseFloat((eth * divisor).toPrecision(10));
};
utility.roundToNearest = function roundToNearest(numToRound, numToRoundToIn) {
const numToRoundTo = 1 / numToRoundToIn;
return Math.round(numToRound * numToRoundTo) / numToRoundTo;
};
utility.getURL = function getURL(url, callback, options) {
request.get(url, options, (err, httpResponse, body) => {
if (err) {
callback(err, undefined);
} else {
callback(undefined, body);
}
});
};
utility.postURL = function postURL(url, formData, callback) {
request.post({ url, form: formData }, (err, httpResponse, body) => {
if (err) {
callback(err, undefined);
} else {
callback(undefined, body);
}
});
};
utility.readFile = function readFile( // eslint-disable-line consistent-return
filename, callback) {
if (callback) {
try {
if (typeof window === 'undefined') {
fs.readFile(filename, { encoding: 'utf8' }, (err, data) => {
if (err) {
callback(err, undefined);
} else {
callback(undefined, data);
}
});
} else {
utility.getURL(`${window.location.origin}/${filename}`, (err, body) => {
if (err) {
callback(err, undefined);
} else {
callback(undefined, body);
}
});
}
} catch (err) {
callback(err, undefined);
}
} else {
try {
return fs.readFileSync(filename, { encoding: 'utf8' });
} catch (err) {
return undefined;
}
}
};
utility.writeFile = function writeFile(filename, data, callback) {
fs.writeFile(filename, data, (err) => {
if (err) {
callback(err, false);
} else {
callback(undefined, true);
}
});
};
utility.createCookie = function createCookie(name, value, days) {
if (localStorage) {
localStorage.setItem(name, value);
} else {
let expires;
if (days) {
const date = new Date();
date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
expires = `; expires=${date.toGMTString()}`;
} else {
expires = '';
}
document.cookie = `${name}=${value}${expires}; path=/`;
}
};
utility.readCookie = function readCookie(name) {
if (localStorage) {
return localStorage.getItem(name);
}
const nameEQ = `${name}=`;
const ca = document.cookie.split(';');
for (let i = 0; i < ca.length; i += 1) {
let c = ca[i];
while (c.charAt(0) === ' ') {
c = c.substring(1, c.length);
}
if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length, c.length);
}
return null;
};
utility.eraseCookie = function eraseCookie(name) {
if (localStorage) {
localStorage.removeItem(name);
} else {
utility.createCookie(name, '', -1);
}
};
utility.getNextNonce = function getNextNonce(web3, address, callback) {
function proxy() {
let url =
`https://${
config.ethTestnet ? config.ethTestnet : 'api'
}.etherscan.io/api?module=proxy&action=eth_GetTransactionCount&address=${
address
}&tag=latest`;
if (config.etherscanAPIKey) url += `&apikey=${config.etherscanAPIKey}`;
utility.getURL(url, (err, body) => {
if (!err) {
const result = JSON.parse(body);
const nextNonce = Number(result.result);
callback(undefined, nextNonce);
} else {
callback(err, undefined);
}
});
}
try {
if (web3.currentProvider) {
web3.eth.getTransactionCount(address, (err, result) => {
if (!err) {
const nextNonce = Number(result);
// Note. initial nonce is 2^20 on testnet,
// but getTransactionCount already starts at 2^20.
callback(undefined, nextNonce);
} else {
proxy();
}
});
} else {
proxy();
}
} catch (err) {
proxy();
}
};
utility.testCall = function testCall(web3, contract, address, functionName, args, callback) {
const options = {};
options.data = contract[functionName].getData.apply(null, args);
options.to = address;
web3.eth.call(options, (err, result) => {
if (!err) {
const functionAbi = contract.abi.find(element =>
element.name === functionName);
const solidityFunction = new SolidityFunction(web3.Eth, functionAbi, address);
callback(err, solidityFunction.unpackOutput(result));
} else {
callback(err, result);
}
});
};
utility.call = function call(web3In, contract, address, functionName, args, callback) {
function proxy(retries) {
const web3 = new Web3();
const data = contract[functionName].getData.apply(null, args);
let url =
`https://${
config.ethTestnet ? config.ethTestnet : 'api'
}.etherscan.io/api?module=proxy&action=eth_Call&to=${
address
}&data=${
data}`;
if (config.etherscanAPIKey) url += `&apikey=${config.etherscanAPIKey}`;
utility.getURL(url, (err, body) => {
if (!err) {
try {
const result = JSON.parse(body);
const functionAbi = contract.abi.find(element => element.name === functionName);
const solidityFunction = new SolidityFunction(web3.Eth, functionAbi, address);
const resultUnpacked = solidityFunction.unpackOutput(result.result);
callback(undefined, resultUnpacked);
} catch (errJson) {
if (retries > 0) {
setTimeout(() => {
proxy(retries - 1);
}, 1000);
} else {
callback(err, undefined);
}
}
} else {
callback(err, undefined);
}
});
}
try {
if (web3In.currentProvider) {
const data = contract[functionName].getData.apply(null, args);
web3In.eth.call({ to: address, data }, (err, result) => {
if (!err) {
const functionAbi = contract.abi.find(element => element.name === functionName);
const solidityFunction = new SolidityFunction(web3In.Eth, functionAbi, address);
try {
const resultUnpacked = solidityFunction.unpackOutput(result);
callback(undefined, resultUnpacked);
} catch (errJson) {
proxy(1);
}
} else {
proxy(1);
}
});
} else {
proxy(1);
}
} catch (err) {
proxy(1);
}
};
utility.testSend = function testSend(
web3, contract, address, functionName, argsIn, fromAddress, privateKey, nonce, callback) {
function encodeConstructorParams(abi, params) {
return abi.filter(json =>
json.type === 'constructor' && json.inputs.length === params.length)
.map(json =>
json.inputs.map(input => input.type))
.map(types => coder.encodeParams(types, params))[0] || '';
}
const args = Array.prototype.slice.call(argsIn).filter(a => a !== undefined);
let options = {};
if (typeof (args[args.length - 1]) === 'object' && args[args.length - 1].gas) {
args[args.length - 1].gasPrice = config.ethGasPrice;
args[args.length - 1].gasLimit = args[args.length - 1].gas;
delete args[args.length - 1].gas;
}
if (utils.isObject(args[args.length - 1])) {
options = args.pop();
}
if (functionName === 'constructor') {
if (options.data.slice(0, 2) !== '0x') {
options.data = `0x${options.data}`;
}
options.data += encodeConstructorParams(contract.abi, args);
} else {
options.to = address;
const functionAbi = contract.abi.find(element => element.name === functionName);
const inputTypes = functionAbi.inputs.map(x => x.type);
const typeName = inputTypes.join();
const data = sha3(`${functionName}(${typeName})`).slice(0, 8) + coder.encodeParams(inputTypes, args);
options.data = `0x${data}`;
}
if (!options.from) options.from = fromAddress;
web3.eth.sendTransaction(options, (err, result) => {
callback(err, result);
});
};
utility.send = function send(
web3,
contract,
address,
functionName,
argsIn,
fromAddress,
privateKeyIn,
nonceIn,
callback) {
let privateKey = privateKeyIn;
if (privateKeyIn && privateKeyIn.substring(0, 2) === '0x') {
privateKey = privateKeyIn.substring(2, privateKeyIn.length);
}
function encodeConstructorParams(abi, params) {
return (
abi
.filter(json => json.type === 'constructor' && json.inputs.length === params.length)
.map(json => json.inputs.map(input => input.type))
.map(types => coder.encodeParams(types, params))[0] || ''
);
}
const args = Array.prototype.slice.call(argsIn).filter(a => a !== undefined);
let options = {};
if (typeof args[args.length - 1] === 'object' && args[args.length - 1].gas) {
args[args.length - 1].gasPrice = config.ethGasPrice;
args[args.length - 1].gasLimit = args[args.length - 1].gas;
delete args[args.length - 1].gas;
}
if (utils.isObject(args[args.length - 1])) {
options = args.pop();
}
utility.getNextNonce(web3, fromAddress, (err, nextNonce) => {
let nonce = nonceIn;
if (nonceIn === undefined || nonceIn < nextNonce) {
nonce = nextNonce;
}
// console.log("Nonce:", nonce);
options.nonce = nonce;
if (functionName === 'constructor') {
if (options.data.slice(0, 2) !== '0x') {
options.data = `0x${options.data}`;
}
const encodedParams = encodeConstructorParams(contract.abi, args);
console.log(encodedParams);
options.data += encodedParams;
} else if (!contract || !functionName) {
options.to = address;
} else {
options.to = address;
const functionAbi = contract.abi.find(element => element.name === functionName);
const inputTypes = functionAbi.inputs.map(x => x.type);
const typeName = inputTypes.join();
options.data =
`0x${
sha3(`${functionName}(${typeName})`).slice(0, 8)
}${coder.encodeParams(inputTypes, args)}`;
}
let tx;
try {
tx = new Tx(options);
function proxy() { // eslint-disable-line no-inner-declarations
if (privateKey) {
utility.signTx(web3, fromAddress, tx, privateKey, (errSignTx, txSigned) => {
if (!errSignTx) {
const serializedTx = txSigned.serialize().toString('hex');
const url = `https://${config.ethTestnet ? config.ethTestnet : 'api'}.etherscan.io/api`;
const formData = { module: 'proxy', action: 'eth_sendRawTransaction', hex: serializedTx };
if (config.etherscanAPIKey) formData.apikey = config.etherscanAPIKey;
utility.postURL(url, formData, (errPostURL, body) => {
if (!errPostURL) {
try {
const result = JSON.parse(body);
if (result.result) {
callback(undefined, { txHash: result.result, nonce: nonce + 1 });
} else if (result.error) {
callback(result.error.message, { txHash: undefined, nonce });
}
} catch (errTry) {
callback(errTry, { txHash: undefined, nonce });
}
} else {
callback(err, { txHash: undefined, nonce });
}
});
} else {
console.log(err);
callback('Failed to sign transaction', { txHash: undefined, nonce });
}
});
} else {
callback('Failed to sign transaction', { txHash: undefined, nonce });
}
}
try {
if (web3.currentProvider) {
options.from = fromAddress;
options.gas = options.gasLimit;
delete options.gasLimit;
web3.eth.sendTransaction(options, (errSend, hash) => {
if (!errSend) {
callback(undefined, { txHash: hash, nonce: nonce + 1 });
} else {
console.log(err);
proxy();
}
});
} else {
proxy();
}
} catch (errSend) {
proxy();
}
} catch (errCatch) {
callback(errCatch, { txHash: undefined, nonce });
}
});
};
utility.estimateGas = function estimateGas(
web3,
contract,
address,
functionName,
argsIn,
fromAddress,
privateKeyIn,
nonceIn,
callback) {
let privateKey = privateKeyIn;
if (privateKeyIn && privateKeyIn.substring(0, 2) === '0x') {
privateKey = privateKeyIn.substring(2, privateKeyIn.length);
}
const args = Array.prototype.slice.call(argsIn).filter(a => a !== undefined);
let options = {};
const functionAbi = contract.abi.find(element => element.name === functionName);
const inputTypes = functionAbi.inputs.map(x => x.type);
if (typeof args[args.length - 1] === 'object' && args[args.length - 1].gas) {
args[args.length - 1].gasPrice = config.ethGasPrice;
args[args.length - 1].gasLimit = args[args.length - 1].gas;
delete args[args.length - 1].gas;
}
if (args.length > inputTypes.length && utils.isObject(args[args.length - 1])) {
options = args[args.length - 1];
}
utility.getNextNonce(web3, fromAddress, (err, nextNonce) => {
let nonce = nonceIn;
if (nonceIn === undefined) {
nonce = nextNonce;
}
options.nonce = nonce;
options.to = address;
const typeName = inputTypes.join();
options.data =
`0x${
sha3(`${functionName}(${typeName})`).slice(0, 8)
}${coder.encodeParams(inputTypes, args)}`;
const tx = new Tx(options);
utility.signTx(web3, fromAddress, tx, privateKey, (errSignTx, txSigned) => {
if (!errSignTx && txSigned) {
if (web3.currentProvider) {
try {
web3.eth.estimateGas(options, (errEstimateGas, result) => {
if (errEstimateGas) {
callback(err, undefined);
} else {
callback(undefined, result);
}
});
} catch (errTry) {
callback(errTry, undefined);
}
} else {
callback('No provider set for web3', undefined);
}
} else {
callback('Failed to sign transaction', undefined);
}
});
});
};
utility.txReceipt = function txReceipt(web3, txHash, callback) {
function proxy() {
let url =
`https://${
config.ethTestnet ? config.ethTestnet : 'api'
}.etherscan.io/api?module=proxy&action=eth_GetTransactionReceipt&txhash=${
txHash}`;
if (config.etherscanAPIKey) url += `&apikey=${config.etherscanAPIKey}`;
utility.getURL(url, (err, body) => {
if (!err) {
const result = JSON.parse(body);
callback(undefined, result.result);
} else {
callback(err, undefined);
}
});
}
try {
if (web3.currentProvider) {
try {
web3.eth.getTransactionReceipt(txHash, (err, result) => {
if (err) {
proxy();
} else {
callback(undefined, result);
}
});
} catch (err) {
proxy();
}
} else {
proxy();
}
} catch (err) {
proxy();
}
};
utility.logsOnce = function logsOnce(web3, contract, address, fromBlock, toBlock, callback) {
function decodeEvent(item) {
const eventAbis = contract.abi.filter(eventAbi => (
eventAbi.type === 'event' &&
item.topics[0] ===
`0x${
sha3(
`${eventAbi.name
}(${
eventAbi.inputs
.map(x => x.type)
.join()
})`)}`
));
if (eventAbis.length > 0) {
const eventAbi = eventAbis[0];
const event = new SolidityEvent(web3, eventAbi, address);
const result = event.decode(item);
return result;
}
return undefined;
}
function proxy(retries) {
let url =
`https://${
config.ethTestnet ? config.ethTestnet : 'api'
}.etherscan.io/api?module=logs&action=getLogs&address=${
address
}&fromBlock=${
fromBlock
}&toBlock=${
toBlock}`;
if (config.etherscanAPIKey) url += `&apikey=${config.etherscanAPIKey}`;
utility.getURL(
url,
(err, body) => {
if (!err) {
try {
const result = JSON.parse(body);
const items = result.result;
async.map(
items,
(item, callbackMap) => {
Object.assign(item, {
blockNumber: utility.hexToDec(item.blockNumber),
logIndex: utility.hexToDec(item.logIndex),
transactionIndex: utility.hexToDec(item.transactionIndex),
});
const event = decodeEvent(item);
callbackMap(null, event);
},
(errMap, events) => {
callback(null, events);
});
} catch (errTry) {
if (retries > 0) {
proxy(retries - 1);
} else {
callback(null, []);
}
}
} else {
callback(null, []);
}
// },
// { timeout: 1500 });
});
}
proxy(1);
};
utility.getBalance = function getBalance(web3, address, callback) {
function proxy() {
let url =
`https://${
config.ethTestnet ? config.ethTestnet : 'api'
}.etherscan.io/api?module=account&action=balance&address=${
address
}&tag=latest`;
if (config.etherscanAPIKey) url += `&apikey=${config.etherscanAPIKey}`;
utility.getURL(url, (err, body) => {
if (!err) {
const result = JSON.parse(body);
const balance = new BigNumber(result.result);
callback(undefined, balance);
} else {
callback(err, undefined);
}
});
}
try {
if (web3.currentProvider) {
web3.eth.getBalance(address, (err, balance) => {
if (!err) {
callback(undefined, balance);
} else {
proxy();
}
});
} else {
proxy();
}
} catch (err) {
proxy();
}
};
utility.getCode = function getCode(web3, address, callback) {
function proxy() {
let url =
`https://${
config.ethTestnet ? config.ethTestnet : 'api'
}.etherscan.io/api?module=proxy&action=eth_getCode&address=${
address
}&tag=latest`;
if (config.etherscanAPIKey) url += `&apikey=${config.etherscanAPIKey}`;
utility.getURL(url, (err, body) => {
if (!err) {
const result = JSON.parse(body);
callback(undefined, result.result);
} else {
callback(err, undefined);
}
});
}
try {
if (web3.currentProvider) {
web3.eth.getCode(address, (err, code) => {
if (!err) {
callback(undefined, code);
} else {
proxy();
}
});
} else {
proxy();
}
} catch (err) {
proxy();
}
};
utility.blockNumber = function blockNumber(web3, callback) {
function proxy() {
let url =
`https://${
config.ethTestnet ? config.ethTestnet : 'api'
}.etherscan.io/api?module=proxy&action=eth_BlockNumber`;
if (config.etherscanAPIKey) url += `&apikey=${config.etherscanAPIKey}`;
utility.getURL(url, (err, body) => {
if (!err) {
const result = JSON.parse(body);
callback(undefined, Number(utility.hexToDec(result.result)));
} else {
callback(err, undefined);
}
});
}
if (web3.currentProvider) {
web3.eth.getBlockNumber((err, result) => {
if (!err) {
callback(undefined, Number(result));
} else {
proxy();
}
});
} else {
proxy();
}
};
utility.signTx = function signTx(web3, address, txIn, privateKey, callback) {
const tx = txIn;
if (privateKey) {
tx.sign(new Buffer(privateKey, 'hex'));
callback(undefined, tx);
} else {
const msgHash = `0x${tx.hash(false).toString('hex')}`;
web3.eth.sign(address, msgHash, (err, sigResult) => {
if (!err) {
try {
const r = sigResult.slice(0, 66);
const s = `0x${sigResult.slice(66, 130)}`;
let v = web3.toDecimal(`0x${sigResult.slice(130, 132)}`);
if (v !== 27 && v !== 28) v += 27;
tx.r = r;
tx.s = s;
tx.v = v;
callback(undefined, tx);
} catch (errTry) {
callback(errTry, undefined);
}
} else {
callback(err, undefined);
}
});
}
};
utility.sign = function sign(web3, address, msgToSignIn, privateKeyIn, callback) {
let msgToSign = msgToSignIn;
if (msgToSign.substring(0, 2) !== '0x') msgToSign = `0x${msgToSign}`;
function prefixMessage(msgIn) {
let msg = msgIn;
msg = new Buffer(msg.slice(2), 'hex');
msg = Buffer.concat([
new Buffer(`\x19Ethereum Signed Message:\n${msg.length.toString()}`),
msg]);
msg = web3.sha3(`0x${msg.toString('hex')}`, { encoding: 'hex' });
msg = new Buffer(msg.slice(2), 'hex');
return `0x${msg.toString('hex')}`;
}
function testSig(msg, sig) {
const recoveredAddress =
`0x${ethUtil.pubToAddress(ethUtil.ecrecover(msg, sig.v, sig.r, sig.s)).toString('hex')}`;
return recoveredAddress === address;
}
if (privateKeyIn) {
let privateKey = privateKeyIn;
if (privateKey.substring(0, 2) === '0x') privateKey = privateKey.substring(2, privateKey.length);
msgToSign = prefixMessage(msgToSign);
try {
const sig = ethUtil.ecsign(
new Buffer(msgToSign.slice(2), 'hex'),
new Buffer(privateKey, 'hex'));
const r = `0x${sig.r.toString('hex')}`;
const s = `0x${sig.s.toString('hex')}`;
const v = sig.v;
const result = { r, s, v };
callback(undefined, result);
} catch (err) {
callback(err, undefined);
}
} else {
web3.version.getNode((error, node) => {
// these nodes still use old-style eth_sign
if (
node &&
(node.match('TestRPC') ||
node.match('MetaMask'))
) {
msgToSign = prefixMessage(msgToSign);
}
web3.eth.sign(address, msgToSign, (err, sigResult) => {
if (err) {
callback('Failed to sign message', undefined);
} else {
const sigHash = sigResult;
const sig = ethUtil.fromRpcSig(sigHash);
let msg;
if (
node &&
(node.match('TestRPC') ||
node.match('MetaMask'))
) {
msg = new Buffer(msgToSign.slice(2), 'hex');
} else {
msg = new Buffer(prefixMessage(msgToSign).slice(2), 'hex');
}
if (testSig(msg, sig, address)) {
const r = `0x${sig.r.toString('hex')}`;
const s = `0x${sig.s.toString('hex')}`;
const v = sig.v;
const result = { r, s, v };
callback(undefined, result);
} else {
callback('Failed to sign message', undefined);
}
}
});
});
}
};
utility.verify = function verify(web3, addressIn, // eslint-disable-line consistent-return
v, rIn, sIn, valueIn, callback) {
const address = addressIn.toLowerCase();
let r = rIn;
let s = sIn;
let value = valueIn;
if (r.substring(0, 2) === '0x') r = r.substring(2, r.length);
if (s.substring(0, 2) === '0x') s = s.substring(2, s.length);
if (value.substring(0, 2) === '0x') value = value.substring(2, value.length);
const pubKey = ethUtil.ecrecover(
new Buffer(value, 'hex'),
Number(v),
new Buffer(r, 'hex'),
new Buffer(s, 'hex'));
const result = address === `0x${ethUtil.pubToAddress(new Buffer(pubKey, 'hex')).toString('hex')}`;
if (callback) {
callback(undefined, result);
} else {
return result;
}
};
utility.createAccount = function createAccount() {
const dk = keythereum.create();
let privateKey = dk.privateKey;
let address = ethUtil.privateToAddress(privateKey);
address = ethUtil.toChecksumAddress(address.toString('hex'));
privateKey = privateKey.toString('hex');
return { address, privateKey };
};
utility.verifyPrivateKey = function verifyPrivateKey(addr, privateKeyIn) {
let privateKey = privateKeyIn;
if (privateKey && privateKey.substring(0, 2) !== '0x') {
privateKey = `0x${privateKey}`;
}
return (
addr === ethUtil.toChecksumAddress(`0x${ethUtil.privateToAddress(privateKey).toString('hex')}`)
);
};
utility.toChecksumAddress = function toChecksumAddress(addrIn) {
let addr = addrIn;
if (addr && addr.substring(0, 2) !== '0x') {
addr = `0x${addr}`;
}
return ethUtil.toChecksumAddress(addr);
};
utility.loadContract = function loadContract(web3, sourceCode, address, callback) {
utility.readFile(`${sourceCode}.interface`, (errAbi, resultAbi) => {
const abi = JSON.parse(resultAbi);
let contract = web3.eth.contract(abi);
contract = contract.at(address);
callback(undefined, contract);
});
};
utility.deployContract = function deployContract(web3, sourceFile,
contractName, constructorParams, address, callback) {
utility.readFile(`${sourceFile}.bytecode`, (errBytecode, resultBytecode) => {
utility.readFile(`${sourceFile}.interface`, (errAbi, resultAbi) => {
if (resultAbi && resultBytecode) {
const abi = JSON.parse(resultAbi);
const bytecode = JSON.parse(resultBytecode);
const contract = web3.eth.contract(abi);
utility.send(
web3,
contract,
undefined,
'constructor',
constructorParams.concat([
{ from: address, data: bytecode, gas: 4700000, gasPrice: config.ethGasPrice },
]),
address,
undefined,
0,
(errSend, result) => {
const txHash = result.txHash;
let contractAddr;
async.whilst(
() => contractAddr === undefined,
(callbackWhilst) => {
setTimeout(() => {
utility.txReceipt(web3, txHash, (err, receipt) => {
if (receipt) {
contractAddr = receipt.contractAddress;
}
callbackWhilst(null);
});
}, 1 * 1000);
},
() => {
callback(undefined, address);
});
});
} else {
callback('Could not load bytecode and ABI', undefined);
}
});
});
};
utility.zeroPad = function zeroPad(num, places) {
const zero = (places - num.toString().length) + 1;
return Array(+(zero > 0 && zero)).join('0') + num;
};
utility.decToHex = function decToHex(dec, lengthIn) {
let length = lengthIn;
if (!length) length = 32;
if (dec < 0) {
// return convertBase((Math.pow(2, length) + decStr).toString(), 10, 16);
return (new BigNumber(2)).pow(length).add(new BigNumber(dec)).toString(16);
}
let result = null;
try {
result = utility.convertBase(dec.toString(), 10, 16);
} catch (err) {
result = null;
}
if (result) {
return result;
}
return (new BigNumber(dec)).toString(16);
};
utility.hexToDec = function hexToDec(hexStrIn, length) {
// length implies this is a two's complement number
let hexStr = hexStrIn;
if (hexStr.substring(0, 2) === '0x') hexStr = hexStr.substring(2);
hexStr = hexStr.toLowerCase();
if (!length) {
return utility.convertBase(hexStr, 16, 10);
}
const max = Math.pow(2, length); // eslint-disable-line no-restricted-properties
const answer = utility.convertBase(hexStr, 16, 10);
return answer > max / 2 ? max : answer;
};
utility.pack = function pack(dataIn, lengths) {
let packed = '';
const data = dataIn.map(x => x);
for (let i = 0; i < lengths.length; i += 1) {
if (typeof (data[i]) === 'string' && data[i].substring(0, 2) === '0x') {
if (data[i].substring(0, 2) === '0x') data[i] = data[i].substring(2);
packed += utility.zeroPad(data[i], lengths[i] / 4);
} else if (typeof (data[i]) !== 'number' && /[a-f]/.test(data[i])) {
if (data[i].substring(0, 2) === '0x') data[i] = data[i].substring(2);
packed += utility.zeroPad(data[i], lengths[i] / 4);
} else {
// packed += zeroPad(new BigNumber(data[i]).toString(16), lengths[i]/4);
packed += utility.zeroPad(utility.decToHex(data[i], lengths[i]), lengths[i] / 4);
}
}
return packed;
};
utility.unpack = function unpack(str, lengths) {
const data = [];
let length = 0;
for (let i = 0; i < lengths.length; i += 1) {
data[i] = parseInt(utility.hexToDec(str.substr(length, lengths[i] / 4), lengths[i]), 10);
length += lengths[i] / 4;
}
return data;
};
utility.convertBase = function convertBase(str, fromBase, toBase) {
const digits = utility.parseToDigitsArray(str, fromBase);
if (digits === null) return null;
let outArray = [];
let power = [1];
for (let i = 0; i < digits.length; i += 1) {
if (digits[i]) {
outArray = utility.add(outArray,
utility.multiplyByNumber(digits[i], power, toBase), toBase);
}
power = utility.multiplyByNumber(fromBase, power, toBase);
}
let out = '';
for (let i = outArray.length - 1; i >= 0; i -= 1) {
out += outArray[i].toString(toBase);
}
if (out === '') out = 0;
return out;
};
utility.parseToDigitsArray = function parseToDigitsArray(str, base) {
const digits = str.split('');
const ary = [];
for (let i = digits.length - 1; i >= 0; i -= 1) {
const n = parseInt(digits[i], base);
if (isNaN(n)) return null;
ary.push(n);
}
return ary;
};
utility.add = function add(x, y, base) {
const z = [];
const n = Math.max(x.length, y.length);
let carry = 0;
let i = 0;
while (i < n || carry) {
const xi = i < x.length ? x[i] : 0;
const yi = i < y.length ? y[i] : 0;
const zi = carry + xi + yi;
z.push(zi % base);
carry = Math.floor(zi / base);
i += 1;
}
return z;
};
utility.multiplyByNumber = function multiplyByNumber(numIn, x, base) {