bitcoinjs-lib
Version:
Client-side Bitcoin JavaScript library
141 lines (140 loc) • 4.96 kB
JavaScript
;
Object.defineProperty(exports, '__esModule', { value: true });
exports.p2wpkh = void 0;
const bcrypto = require('../crypto');
const networks_1 = require('../networks');
const bscript = require('../script');
const types_1 = require('../types');
const lazy = require('./lazy');
const bech32_1 = require('bech32');
const OPS = bscript.OPS;
const EMPTY_BUFFER = Buffer.alloc(0);
// witness: {signature} {pubKey}
// input: <>
// output: OP_0 {pubKeyHash}
/**
* Creates a pay-to-witness-public-key-hash (p2wpkh) payment object.
*
* @param a - The payment object containing the necessary data.
* @param opts - Optional payment options.
* @returns The p2wpkh payment object.
* @throws {TypeError} If the required data is missing or invalid.
*/
function p2wpkh(a, opts) {
if (!a.address && !a.hash && !a.output && !a.pubkey && !a.witness)
throw new TypeError('Not enough data');
opts = Object.assign({ validate: true }, opts || {});
(0, types_1.typeforce)(
{
address: types_1.typeforce.maybe(types_1.typeforce.String),
hash: types_1.typeforce.maybe(types_1.typeforce.BufferN(20)),
input: types_1.typeforce.maybe(types_1.typeforce.BufferN(0)),
network: types_1.typeforce.maybe(types_1.typeforce.Object),
output: types_1.typeforce.maybe(types_1.typeforce.BufferN(22)),
pubkey: types_1.typeforce.maybe(types_1.isPoint),
signature: types_1.typeforce.maybe(bscript.isCanonicalScriptSignature),
witness: types_1.typeforce.maybe(
types_1.typeforce.arrayOf(types_1.typeforce.Buffer),
),
},
a,
);
const _address = lazy.value(() => {
const result = bech32_1.bech32.decode(a.address);
const version = result.words.shift();
const data = bech32_1.bech32.fromWords(result.words);
return {
version,
prefix: result.prefix,
data: Buffer.from(data),
};
});
const network = a.network || networks_1.bitcoin;
const o = { name: 'p2wpkh', network };
lazy.prop(o, 'address', () => {
if (!o.hash) return;
const words = bech32_1.bech32.toWords(o.hash);
words.unshift(0x00);
return bech32_1.bech32.encode(network.bech32, words);
});
lazy.prop(o, 'hash', () => {
if (a.output) return a.output.slice(2, 22);
if (a.address) return _address().data;
if (a.pubkey || o.pubkey) return bcrypto.hash160(a.pubkey || o.pubkey);
});
lazy.prop(o, 'output', () => {
if (!o.hash) return;
return bscript.compile([OPS.OP_0, o.hash]);
});
lazy.prop(o, 'pubkey', () => {
if (a.pubkey) return a.pubkey;
if (!a.witness) return;
return a.witness[1];
});
lazy.prop(o, 'signature', () => {
if (!a.witness) return;
return a.witness[0];
});
lazy.prop(o, 'input', () => {
if (!o.witness) return;
return EMPTY_BUFFER;
});
lazy.prop(o, 'witness', () => {
if (!a.pubkey) return;
if (!a.signature) return;
return [a.signature, a.pubkey];
});
// extended validation
if (opts.validate) {
let hash = Buffer.from([]);
if (a.address) {
if (network && network.bech32 !== _address().prefix)
throw new TypeError('Invalid prefix or Network mismatch');
if (_address().version !== 0x00)
throw new TypeError('Invalid address version');
if (_address().data.length !== 20)
throw new TypeError('Invalid address data');
hash = _address().data;
}
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 !== 22 ||
a.output[0] !== OPS.OP_0 ||
a.output[1] !== 0x14
)
throw new TypeError('Output is invalid');
if (hash.length > 0 && !hash.equals(a.output.slice(2)))
throw new TypeError('Hash mismatch');
else hash = a.output.slice(2);
}
if (a.pubkey) {
const pkh = bcrypto.hash160(a.pubkey);
if (hash.length > 0 && !hash.equals(pkh))
throw new TypeError('Hash mismatch');
else hash = pkh;
if (!(0, types_1.isPoint)(a.pubkey) || a.pubkey.length !== 33)
throw new TypeError('Invalid pubkey for p2wpkh');
}
if (a.witness) {
if (a.witness.length !== 2) throw new TypeError('Witness is invalid');
if (!bscript.isCanonicalScriptSignature(a.witness[0]))
throw new TypeError('Witness has invalid signature');
if (!(0, types_1.isPoint)(a.witness[1]) || a.witness[1].length !== 33)
throw new TypeError('Witness has invalid pubkey');
if (a.signature && !a.signature.equals(a.witness[0]))
throw new TypeError('Signature mismatch');
if (a.pubkey && !a.pubkey.equals(a.witness[1]))
throw new TypeError('Pubkey mismatch');
const pkh = bcrypto.hash160(a.witness[1]);
if (hash.length > 0 && !hash.equals(pkh))
throw new TypeError('Hash mismatch');
}
}
return Object.assign(o, a);
}
exports.p2wpkh = p2wpkh;