bitcoinjs-lib/src/payments/embed.js

'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
const networks_1 = require('../networks');
const bscript = require('../script');
const lazy = require('./lazy');
const typef = require('typeforce');
const OPS = bscript.OPS;
function stacksEqual(a, b) {
  if (a.length !== b.length) return false;
  return a.every((x, i) => {
    return x.equals(b[i]);
  });
}
// output: OP_RETURN ...
function p2data(a, opts) {
  if (!a.data && !a.output) throw new TypeError('Not enough data');
  opts = Object.assign({ validate: true }, opts || {});
  typef(
    {
      network: typef.maybe(typef.Object),
      output: typef.maybe(typef.Buffer),
      data: typef.maybe(typef.arrayOf(typef.Buffer)),
    },
    a,
  );
  const network = a.network || networks_1.bitcoin;
  const o = { name: 'embed', network };
  lazy.prop(o, 'output', () => {
    if (!a.data) return;
    return bscript.compile([OPS.OP_RETURN].concat(a.data));
  });
  lazy.prop(o, 'data', () => {
    if (!a.output) return;
    return bscript.decompile(a.output).slice(1);
  });
  // extended validation
  if (opts.validate) {
    if (a.output) {
      const chunks = bscript.decompile(a.output);
      if (chunks[0] !== OPS.OP_RETURN) throw new TypeError('Output is invalid');
      if (!chunks.slice(1).every(typef.Buffer))
        throw new TypeError('Output is invalid');
      if (a.data && !stacksEqual(a.data, o.data))
        throw new TypeError('Data mismatch');
    }
  }
  return Object.assign(o, a);
}
exports.p2data = p2data;