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make_transaction_btc.js
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make_transaction_btc.js
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const BitcoinJS = require('bitcoinjs-lib');
const ecdsa = require('bitcoinjs-lib/src/ecdsa');
const readline = require('readline');
const async = require('async');
const coinSelect = require('coinselect');
const http = require('https');
const request = require('request');
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
function loopAsk(question, itemCallback, doneCallback) {
rl.question(`${question}:`, (answer) => {
answer = answer.trim();
if(answer === 'END') {
doneCallback();
} else {
itemCallback(answer);
loopAsk(question, itemCallback, doneCallback);
}
});
}
function askSpendAddresses(callback){
let utxos = [];
loopAsk('Address', answer => {
//const [vout, value, txId] = answer.split(/\s+/);
//utxos.push({ vout: parseInt(vout, 10), value: parseInt(value, 10), txId });
utxos.push(answer);
}, () => callback(utxos));
}
function askOutputs(callback){
let utxos = [];
loopAsk('OUTPUT', answer => {
const [value, address] = answer.split(/\s+/);
utxos.push({ value: parseInt(value, 10), address });
}, () => callback(utxos));
}
function ECPairStub(publicKey, signResult){
const res = {
network: BitcoinJS.networks.bitcoin,
publicKey,
sign(hash) {
res.txHash = hash;
return signResult;
}
};
return res
}
function getHashForSignature(txb, i, script, value, pubKey){
const stub = ECPairStub(pubKey, null);
const txbClone = BitcoinJS.TransactionBuilder.fromTransaction(BitcoinJS.Transaction.fromHex(txb.tx.toHex(), txb.tx.network));
try{
txbClone.sign(i, stub, script, null, value);
} catch(e) {
if(!stub.txHash) throw e;
}
return stub.txHash;
}
function askSignature(hash, i, pubKey, callback){
console.log(`Now signing input ${i}`);
console.log(`Hash to sign: ${hash.toString('hex')}`)
rl.question(`Signature (hex):`, (signature) => {
const ECPair = BitcoinJS.ECPair.fromPublicKeyBuffer(pubKey);
const RSBuffer = Buffer.from(signature, 'hex');
if (ecdsa.verify(hash, BitcoinJS.ECSignature.fromRSBuffer(RSBuffer), ECPair.Q)) {
callback(RSBuffer);
} else {
console.log('Invalid signature, try again');
askSignature(hash, i, pubKey, callback);
}
});
}
function askPK(addr, next) {
rl.question(`Public key for address ${addr} (hex):`, (pk) => {
let pubKey = Buffer.from(pk, 'hex')
let version = BitcoinJS.address.fromBase58Check(addr).version;
if (version === BitcoinJS.networks.bitcoin.scriptHash) {
let pubKeyHash = BitcoinJS.crypto.hash160(pubKey);
let redeemScript = BitcoinJS.script.witnessPubKeyHash.output.encode(pubKeyHash);
let redeemScriptHash = BitcoinJS.crypto.hash160(redeemScript);
let scriptPubKey = BitcoinJS.script.scriptHash.output.encode(redeemScriptHash);
let address = BitcoinJS.address.fromOutputScript(scriptPubKey);
if (addr !== address) throw new Error('Script hash doesnt match P2SH address');
next({ redeemScript, pubKey })
} else if (version === BitcoinJS.networks.bitcoin.pubKeyHash) {
let keyPair = new BitcoinJS.ECPair.fromPublicKeyBuffer(pubKey);
let address = keyPair.getAddress();
if (addr !== address) throw new Error('Public key doesnt match address');
next({ pubKey });
} else {
throw new Error("Unsupported address")
}
});
}
async.waterfall([
(next) => {
console.log('Insert addresses to spend:');
askSpendAddresses((utxos) => next(null, utxos));
},
(addrs, next) => {
let utxos = [];
async.eachOfSeries(addrs, (addr, i, next) => {
askPK(addr, ({ pubKey, redeemScript }) => {
console.log(`Downloading UTXOS for ${addr}...`)
request.get({url: `https://blockchain.info/unspent?active=${addr}&format=json`, json: true}, (err, res, data) => {
if (err) {
console.log(err);
return next(err);
}
data.unspent_outputs.forEach(({ value, tx_hash_big_endian, tx_output_n, script }) => {
utxos.push({
outScript: Buffer.from(script, 'hex'),
pubKey,
txId: tx_hash_big_endian,
vout: tx_output_n,
value,
script: redeemScript,
});
});
next();
});
});
}, (err) => next(err, utxos));
},
(utxos, next) => {
console.log(utxos);
console.log('Insert transaction outputs [value] [address]');
console.log('A charge output will be added automatically. Can be left blank to sweep address');
console.log('Write END when done.');
askOutputs((outs) => next(null, utxos, outs));
},
(utxos, outs, next) => {
console.log('Insert desired fee in satoshis per byte (check current in https://bitcoinfees.earn.com/)');
rl.question(`Fee rate:`, (answer) => {
let feeRate = parseFloat(answer);
if (feeRate < 1.024) throw new Error('min relay fee not met');
next(null, utxos, outs, feeRate);
});
},
(utxos, outs, feeRate, next) => {
let { inputs, outputs, fee } = coinSelect(utxos, outs, feeRate)
if (!inputs || !outputs) {
console.log('Could not select UTXOS to match outputs');
return next('UTXOS_NO_SOLUTION');
}
console.log(`Total fee: ${fee} satoshis, ${fee/1e8}btc`);
if (outputs.some(({address}) => !address)) {
rl.question(`Change address:`, (change) => {
outputs.forEach(o => o.address = o.address || change);
next(null, inputs, outputs);
});
} else {
next(null, inputs, outputs);
}
},
(inputs, outputs, next) => {
console.log({ inputs, outputs });
const txb = new BitcoinJS.TransactionBuilder();
inputs.forEach(({ vout, txId, outScript }) => txb.addInput(txId, vout, null, outScript));
outputs.forEach(({ address, value }) => txb.addOutput(address, value));
console.log('Unsigned transaction:')
console.log(txb.tx.toHex());
console.log('Decode and see if it looks good before signing');
async.eachOfSeries(inputs, ({ script, value, pubKey }, i, next) => {
let sign_hash = getHashForSignature(txb, i, script, value, pubKey);
askSignature(sign_hash, i, pubKey, (RSBuffer) => {
txb.sign(i, ECPairStub(pubKey, RSBuffer), script, null, value);
next();
});
}, () => next(null, txb));
},
(txb) => {
console.log(txb.build().toHex());
}
])