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• .. (вверх)
• [DIR] ..
• [FILE] btc.js
• [FILE] eth.js
• [FILE] ltc.js
• [FILE] rmg.js
• [FILE] tbtc.js
• [FILE] teth.js
• [FILE] tltc.js
• [FILE] trmg.js
• [FILE] txrp.js
• [FILE] xrp.js

Просмотр файла: btc.js

var BaseCoin = require('../baseCoin');
var common = require('../../common');
var bitcoin = require('bitcoinjs-lib');
var _ = require('lodash');

var Btc = function() {
  // this function is called externally from BaseCoin
  // replace the BaseCoin prototype with the local override prototype, which inherits from BaseCoin
  // effectively, move the BaseCoin prototype one level away
  this.__proto__ = Btc.prototype;
  this.network = bitcoin.networks.bitcoin;
};

Btc.prototype.__proto__ = BaseCoin.prototype;

/**
 * Returns the factor between the base unit and its smallest subdivison
 * @return {number}
 */
Btc.prototype.getBaseFactor = function() {
  return 1e8;
};

Btc.prototype.getChain = function() {
  return 'btc';
};
Btc.prototype.getFamily = function() {
  return 'btc';
};

Btc.prototype.isValidAddress = function(address, forceAltScriptSupport) {
  const validVersions = [
    this.network.pubKeyHash,
    this.network.scriptHash,
  ];
  if (this.altScriptHash && (forceAltScriptSupport || this.supportAltScriptDestination)) {
    validVersions.push(this.altScriptHash);
  }

  let addressDetails;
  try {
    addressDetails = bitcoin.address.fromBase58Check(address);
  } catch (e) {
    return false;
  }

  // the address version needs to be among the valid ones
  return validVersions.indexOf(addressDetails.version) !== -1;
};

/**
 * Assemble keychain and half-sign prebuilt transaction
 * @param params
 * - txPrebuild
 * - prv
 * @returns {{txHex}}
 */
Btc.prototype.signTransaction = function(params) {
  var txPrebuild = params.txPrebuild;
  var userPrv = params.prv;

  var transaction = bitcoin.Transaction.fromHex(txPrebuild.txHex);

  if (transaction.ins.length !== txPrebuild.txInfo.unspents.length) {
    throw new Error('length of unspents array should equal to the number of transaction inputs');
  }

  var keychain = bitcoin.HDNode.fromBase58(userPrv);
  var hdPath = bitcoin.hdPath(keychain);

  for (var index = 0; index < transaction.ins.length; ++index) {
    var path = "m/0/0/" + txPrebuild.txInfo.unspents[index].chain + "/" + txPrebuild.txInfo.unspents[index].index;
    var privKey = hdPath.deriveKey(path);

    var subscript = new Buffer(txPrebuild.txInfo.unspents[index].redeemScript, 'hex');
    var txb = bitcoin.TransactionBuilder.fromTransaction(transaction);
    try {
      txb.sign(index, privKey, subscript, bitcoin.Transaction.SIGHASH_ALL);
    } catch (e) {
      throw new Error('Failed to sign input #' + index);
    }

    transaction = txb.buildIncomplete();
  }

  return {
    txHex: transaction.toBuffer().toString('hex')
  };
};

Btc.prototype.explainTransaction = function(params) {
  var self = this;
  var transaction = bitcoin.Transaction.fromBuffer(new Buffer(params.txHex, 'hex'));
  var id = transaction.getId();
  var changeAddresses = [];
  var spendAmount = 0;
  var changeAmount = 0;
  if (params.txInfo && params.txInfo.changeAddresses) {
    changeAddresses = params.txInfo.changeAddresses;
  }
  var explanation = {
    displayOrder: ['id', 'outputAmount', 'changeAmount', 'outputs', 'changeOutputs'],
    id: id,
    outputs: [],
    changeOutputs: []
  };
  transaction.outs.forEach(function(currentOutput) {
    var currentAddress = bitcoin.address.fromOutputScript(currentOutput.script, self.network);
    var currentAmount = currentOutput.value;

    if (changeAddresses.indexOf(currentAddress) !== -1) {
      // this is change
      changeAmount += currentAmount;
      explanation.changeOutputs.push({
        address: currentAddress,
        amount: currentAmount
      });
      return;
    }

    spendAmount += currentAmount;
    explanation.outputs.push({
      address: currentAddress,
      amount: currentAmount
    });
  });
  explanation.outputAmount = spendAmount;
  explanation.changeAmount = changeAmount;

  // add fee info if available
  if (params.feeInfo) {
    explanation.displayOrder.push('fee');
    explanation.fee = params.feeInfo;
  }
  return explanation;
};

module.exports = Btc;

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