@abcpros/bitcore-wallet-service/src/lib/model/copayer.ts

A service for Mutisig HD Bitcoin Wallets

import { Address } from './address';
import { AddressManager } from './addressmanager';

const $ = require('preconditions').singleton();
const sjcl = require('sjcl');
const Common = require('../common');
const Constants = Common.Constants,
  Defaults = Common.Defaults,
  Utils = Common.Utils;

export interface ICopayer {
  version: number;
  createdOn: number;
  coin: string;
  xPubKey: string;
  id: string;
  name: string;
  requestPubKey: string;
  signature: string;
  requestPubKeys: Array<{
    key: string;
    signature: string;
  }>;
  customData: any;
}

export class Copayer {
  version: number;
  createdOn: number;
  coin: string;
  xPubKey: string;
  id: string;
  name: string;
  requestPubKey: string;
  signature: string;
  requestPubKeys: Array<{
    key: string;
    signature: string;
  }>;
  customData: any;
  addressManager: AddressManager;

  static _xPubToCopayerId(coin, xpub) {
    const str = coin == Defaults.COIN ? xpub : coin + xpub;
    const hash = sjcl.hash.sha256.hash(str);
    return sjcl.codec.hex.fromBits(hash);
  }

  static create(opts) {
    opts = opts || {};
    $.checkArgument(opts.xPubKey, 'Missing copayer extended public key')
      .checkArgument(opts.requestPubKey, 'Missing copayer request public key')
      .checkArgument(opts.signature, 'Missing copayer request public key signature');

    $.checkArgument(Utils.checkValueInCollection(opts.coin, Constants.COINS));

    opts.copayerIndex = opts.copayerIndex || 0;

    const x = new Copayer();

    x.version = 2;
    x.createdOn = Math.floor(Date.now() / 1000);
    x.coin = opts.coin;
    x.xPubKey = opts.xPubKey;
    x.id = Copayer._xPubToCopayerId(opts.coin, x.xPubKey);
    x.name = opts.name;
    x.requestPubKey = opts.requestPubKey;
    x.signature = opts.signature;
    x.requestPubKeys = [
      {
        key: opts.requestPubKey,
        signature: opts.signature
      }
    ];

    const derivationStrategy = opts.derivationStrategy || Constants.DERIVATION_STRATEGIES.BIP45;
    if (AddressManager.supportsCopayerBranches(derivationStrategy)) {
      x.addressManager = AddressManager.fromObj({
        derivationStrategy,
        copayerIndex: opts.copayerIndex
      });
    }

    x.customData = opts.customData;

    return x;
  }

  static fromObj(obj) {
    const x = new Copayer();

    x.version = obj.version;
    x.createdOn = obj.createdOn;
    x.coin = obj.coin || Defaults.COIN;
    x.id = obj.id;
    x.name = obj.name;
    x.xPubKey = obj.xPubKey;
    x.requestPubKey = obj.requestPubKey;
    x.signature = obj.signature;

    if (parseInt(x.version.toString()) == 1) {
      x.requestPubKeys = [
        {
          key: x.requestPubKey,
          signature: x.signature
        }
      ];
      x.version = 2;
    } else {
      x.requestPubKeys = obj.requestPubKeys;
    }

    if (obj.addressManager) {
      x.addressManager = AddressManager.fromObj(obj.addressManager);
    }
    x.customData = obj.customData;

    return x;
  }

  createAddress(wallet, isChange) {
    $.checkState(wallet.isComplete(), 'Failed state: wallet incomplete at <createAddress()>');

    const path = this.addressManager.getNewAddressPath(isChange);
    const address = Address.derive(
      wallet.id,
      wallet.addressType,
      wallet.publicKeyRing,
      path,
      wallet.m,
      wallet.coin,
      wallet.network,
      isChange
    );
    return address;
  }
}