143 lines
4.2 KiB
TypeScript
143 lines
4.2 KiB
TypeScript
import * as bcrypto from '../crypto';
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import { bitcoin as BITCOIN_NETWORK } from '../networks';
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import * as bscript from '../script';
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import { Payment, PaymentOpts } from './index';
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import * as lazy from './lazy';
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const typef = require('typeforce');
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const OPS = bscript.OPS;
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const ecc = require('tiny-secp256k1');
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const bech32 = require('bech32');
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const EMPTY_BUFFER = Buffer.alloc(0);
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// witness: {signature} {pubKey}
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// input: <>
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// output: OP_0 {pubKeyHash}
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export function p2wpkh(a: Payment, opts?: PaymentOpts): Payment {
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if (!a.address && !a.hash && !a.output && !a.pubkey && !a.witness)
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throw new TypeError('Not enough data');
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opts = Object.assign({ validate: true }, opts || {});
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typef(
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{
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address: typef.maybe(typef.String),
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hash: typef.maybe(typef.BufferN(20)),
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input: typef.maybe(typef.BufferN(0)),
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network: typef.maybe(typef.Object),
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output: typef.maybe(typef.BufferN(22)),
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pubkey: typef.maybe(ecc.isPoint),
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signature: typef.maybe(bscript.isCanonicalScriptSignature),
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witness: typef.maybe(typef.arrayOf(typef.Buffer)),
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},
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a,
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);
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const _address = lazy.value(() => {
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const result = bech32.decode(a.address);
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const version = result.words.shift();
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const data = bech32.fromWords(result.words);
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return {
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version,
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prefix: result.prefix,
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data: Buffer.from(data),
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};
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});
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const network = a.network || BITCOIN_NETWORK;
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const o: Payment = { network };
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lazy.prop(o, 'address', () => {
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if (!o.hash) return;
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const words = bech32.toWords(o.hash);
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words.unshift(0x00);
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return bech32.encode(network.bech32, words);
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});
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lazy.prop(o, 'hash', () => {
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if (a.output) return a.output.slice(2, 22);
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if (a.address) return _address().data;
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if (a.pubkey || o.pubkey) return bcrypto.hash160(a.pubkey! || o.pubkey!);
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});
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lazy.prop(o, 'output', () => {
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if (!o.hash) return;
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return bscript.compile([OPS.OP_0, o.hash]);
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});
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lazy.prop(o, 'pubkey', () => {
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if (a.pubkey) return a.pubkey;
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if (!a.witness) return;
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return a.witness[1];
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});
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lazy.prop(o, 'signature', () => {
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if (!a.witness) return;
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return a.witness[0];
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});
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lazy.prop(o, 'input', () => {
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if (!o.witness) return;
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return EMPTY_BUFFER;
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});
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lazy.prop(o, 'witness', () => {
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if (!a.pubkey) return;
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if (!a.signature) return;
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return [a.signature, a.pubkey];
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});
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// extended validation
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if (opts.validate) {
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let hash: Buffer = Buffer.from([]);
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if (a.address) {
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if (network && network.bech32 !== _address().prefix)
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throw new TypeError('Invalid prefix or Network mismatch');
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if (_address().version !== 0x00)
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throw new TypeError('Invalid address version');
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if (_address().data.length !== 20)
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throw new TypeError('Invalid address data');
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hash = _address().data;
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}
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if (a.hash) {
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if (hash.length > 0 && !hash.equals(a.hash))
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throw new TypeError('Hash mismatch');
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else hash = a.hash;
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}
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if (a.output) {
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if (
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a.output.length !== 22 ||
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a.output[0] !== OPS.OP_0 ||
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a.output[1] !== 0x14
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)
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throw new TypeError('Output is invalid');
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if (hash.length > 0 && !hash.equals(a.output.slice(2)))
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throw new TypeError('Hash mismatch');
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else hash = a.output.slice(2);
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}
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if (a.pubkey) {
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const pkh = bcrypto.hash160(a.pubkey);
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if (hash.length > 0 && !hash.equals(pkh))
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throw new TypeError('Hash mismatch');
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else hash = pkh;
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}
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if (a.witness) {
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if (a.witness.length !== 2) throw new TypeError('Witness is invalid');
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if (!bscript.isCanonicalScriptSignature(a.witness[0]))
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throw new TypeError('Witness has invalid signature');
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if (!ecc.isPoint(a.witness[1]))
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throw new TypeError('Witness has invalid pubkey');
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if (a.signature && !a.signature.equals(a.witness[0]))
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throw new TypeError('Signature mismatch');
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if (a.pubkey && !a.pubkey.equals(a.witness[1]))
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throw new TypeError('Pubkey mismatch');
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const pkh = bcrypto.hash160(a.witness[1]);
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if (hash.length > 0 && !hash.equals(pkh))
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throw new TypeError('Hash mismatch');
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}
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}
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return Object.assign(o, a);
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}
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