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helper.js
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helper.js
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const path = require('path')
const {
readFileSync,
existsSync
} = require('fs')
const {
bsv,
compileContract: compileContractImpl
} = require('scryptlib')
const {
getPlatformScryptc,
} = require('scryptlib/dist/compilerWrapper')
const { exit } = require('process');
const Signature = bsv.crypto.Signature
const BN = bsv.crypto.BN
const Interpreter = bsv.Script.Interpreter
// number of bytes to denote some numeric value
const DataLen = 1
const axios = require('axios')
const API_PREFIX = 'https://api.whatsonchain.com/v1/bsv/test'
const inputIndex = 0
const inputSatoshis = 100000
const flags = Interpreter.SCRIPT_VERIFY_MINIMALDATA | Interpreter.SCRIPT_ENABLE_SIGHASH_FORKID | Interpreter.SCRIPT_ENABLE_MAGNETIC_OPCODES | Interpreter.SCRIPT_ENABLE_MONOLITH_OPCODES
const minFee = 546
const dummyTxId = 'a477af6b2667c29670467e4e0728b685ee07b240235771862318e29ddbe58458'
const reversedDummyTxId = '5884e5db9de218238671572340b207ee85b628074e7e467096c267266baf77a4'
const sighashType2Hex = s => s.toString(16)
function newTx() {
const utxo = {
txId: 'a477af6b2667c29670467e4e0728b685ee07b240235771862318e29ddbe58458',
outputIndex: 0,
script: '', // placeholder
satoshis: inputSatoshis
};
return new bsv.Transaction().from(utxo);
}
// reverse hexStr byte order
function reverseEndian(hexStr) {
let num = new BN(hexStr, 'hex')
let buf = num.toBuffer()
return buf.toString('hex').match(/.{2}/g).reverse().join('')
}
async function createPayByOthersTx(address) {
// step 1: fetch utxos
let {
data: utxos
} = await axios.get(`${API_PREFIX}/address/${address}/unspent`)
utxos = utxos.map((utxo) => ({
txId: utxo.tx_hash,
outputIndex: utxo.tx_pos,
satoshis: utxo.value,
script: bsv.Script.buildPublicKeyHashOut(address).toHex(),
}))
// step 2: build the tx
const tx = new bsv.Transaction().from(utxos)
return tx
}
async function createLockingTx(address, amountInContract, fee) {
// step 1: fetch utxos
let {
data: utxos
} = await axios.get(`${API_PREFIX}/address/${address}/unspent`)
utxos = utxos.map((utxo) => ({
txId: utxo.tx_hash,
outputIndex: utxo.tx_pos,
satoshis: utxo.value,
script: bsv.Script.buildPublicKeyHashOut(address).toHex(),
}))
// step 2: build the tx
const tx = new bsv.Transaction().from(utxos)
tx.addOutput(new bsv.Transaction.Output({
script: new bsv.Script(), // place holder
satoshis: amountInContract,
}))
tx.change(address).fee(fee || minFee)
return tx
}
function createUnlockingTx(prevTxId, inputAmount, inputLockingScriptASM, outputAmount, outputLockingScriptASM) {
const tx = new bsv.Transaction()
tx.addInput(new bsv.Transaction.Input({
prevTxId,
outputIndex: inputIndex,
script: new bsv.Script(), // placeholder
}), bsv.Script.fromASM(inputLockingScriptASM), inputAmount)
tx.addOutput(new bsv.Transaction.Output({
script: bsv.Script.fromASM(outputLockingScriptASM || inputLockingScriptASM),
satoshis: outputAmount,
}))
tx.fee(inputAmount - outputAmount)
return tx
}
function unlockP2PKHInput(privateKey, tx, inputIndex, sigtype) {
const sig = new bsv.Transaction.Signature({
publicKey: privateKey.publicKey,
prevTxId: tx.inputs[inputIndex].prevTxId,
outputIndex: tx.inputs[inputIndex].outputIndex,
inputIndex,
signature: bsv.Transaction.Sighash.sign(tx, privateKey, sigtype,
inputIndex,
tx.inputs[inputIndex].output.script,
tx.inputs[inputIndex].output.satoshisBN),
sigtype,
});
tx.inputs[inputIndex].setScript(bsv.Script.buildPublicKeyHashIn(
sig.publicKey,
sig.signature.toDER(),
sig.sigtype,
))
}
async function sendTx(tx) {
const {
data: txid
} = await axios.post(`${API_PREFIX}/tx/raw`, {
txhex: tx.serialize()
})
return txid
}
function compileContract(fileName) {
const filePath = path.join(__dirname, 'contracts', fileName)
const out = path.join(__dirname, 'deployments/fixture/autoGen')
return compileContractImpl(filePath, out);
}
function loadDesc(fileName) {
const filePath = path.join(__dirname, `deployments/fixture/autoGen/${fileName}`);
if (!existsSync(filePath)) {
throw new Error(`Description file ${filePath} not exist!\nIf You already run 'npm run watch', maybe fix the compile error first!`)
}
return JSON.parse(readFileSync(filePath).toString());
}
function showError(error) {
// Error
if (error.response) {
// The request was made and the server responded with a status code
// that falls out of the range of 2xx
console.log('Failed - StatusCodeError: ' + error.response.status + ' - "' + error.response.data + '"');
// console.log(error.response.headers);
} else if (error.request) {
// The request was made but no response was received
// `error.request` is an instance of XMLHttpRequest in the
// browser and an instance of
// http.ClientRequest in node.js
console.log(error.request);
} else {
// Something happened in setting up the request that triggered an Error
console.log('Error:', error.message, error.stack);
if (error.context) {
console.log(error.context);
}
}
};
module.exports = {
inputIndex,
inputSatoshis,
newTx,
createPayByOthersTx,
createLockingTx,
createUnlockingTx,
DataLen,
dummyTxId,
reversedDummyTxId,
reverseEndian,
unlockP2PKHInput,
sendTx,
compileContract,
loadDesc,
sighashType2Hex,
showError
}