@trezor/utxo-lib/lib/payments/sstxcommitment.js

Client-side Bitcoin-like JavaScript library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.sstxcommitment = sstxcommitment;
const tslib_1 = require("tslib");
const bs58check = tslib_1.__importStar(require("../bs58check"));
const bufferutils_1 = require("../bufferutils");
const networks_1 = require("../networks");
const bscript = tslib_1.__importStar(require("../script"));
const lazy = tslib_1.__importStar(require("./lazy"));
const types_1 = require("../types");
const {
  OPS
} = bscript;
function sstxcommitment(a, opts) {
  if (!a.address && !a.amount && !a.hash && !a.output) throw new TypeError('Not enough data');
  opts = Object.assign({
    validate: true
  }, opts || {});
  (0, types_1.typeforce)({
    network: types_1.typeforce.maybe(types_1.typeforce.Object),
    address: types_1.typeforce.maybe(types_1.typeforce.String),
    amount: types_1.typeforce.maybe(types_1.typeforce.String),
    hash: types_1.typeforce.maybe(types_1.typeforce.BufferN(20)),
    output: types_1.typeforce.maybe(types_1.typeforce.Buffer)
  }, a);
  const _address = lazy.value(() => bs58check.decodeAddress(a.address, a.network));
  const network = a.network || networks_1.decred;
  const o = {
    name: 'sstxcommitment',
    network
  };
  lazy.prop(o, 'address', () => {
    if (!o.hash) return;
    return bs58check.encodeAddress(o.hash, network.pubKeyHash, network);
  });
  lazy.prop(o, 'hash', () => {
    if (a.output) return a.output.subarray(2, 22);
    if (a.address) return _address().hash;
  });
  lazy.prop(o, 'output', () => {
    if (!o.hash || !a.amount) return;
    const buf = Buffer.allocUnsafe(o.hash.length + 10);
    const writer = new bufferutils_1.BufferWriter(buf);
    writer.writeSlice(o.hash);
    writer.writeUInt64(a.amount);
    writer.writeUInt8(0);
    writer.writeUInt8(88);
    return bscript.compile([OPS.OP_RETURN, buf]);
  });
  if (opts.validate) {
    let hash = Buffer.from([]);
    if (a.address) {
      const {
        version,
        hash: aHash
      } = _address();
      if (version !== network.pubKeyHash) throw new TypeError('Invalid version or Network mismatch');
      if (aHash.length !== 20) throw new TypeError('Invalid address');
      hash = aHash;
    }
    if (a.hash) {
      if (hash.length > 0 && !hash.equals(a.hash)) throw new TypeError('Hash mismatch');else hash = a.hash;
    }
    if (a.output) {
      if (a.output.length !== 32 || a.output[0] !== OPS.OP_RETURN) throw new TypeError('sstxcommitment output is invalid');
      const hash2 = a.output.subarray(2, 22);
      if (hash.length > 0 && !hash.equals(hash2)) throw new TypeError('Hash mismatch');
    }
  }
  return Object.assign(o, a);
}
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