bitcoinjs-lib
Version:
Client-side Bitcoin JavaScript library
222 lines (221 loc) • 7.39 kB
JavaScript
;
Object.defineProperty(exports, '__esModule', { value: true });
exports.p2wsh = 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);
function stacksEqual(a, b) {
if (a.length !== b.length) return false;
return a.every((x, i) => {
return x.equals(b[i]);
});
}
function chunkHasUncompressedPubkey(chunk) {
if (
Buffer.isBuffer(chunk) &&
chunk.length === 65 &&
chunk[0] === 0x04 &&
(0, types_1.isPoint)(chunk)
) {
return true;
} else {
return false;
}
}
// input: <>
// witness: [redeemScriptSig ...] {redeemScript}
// output: OP_0 {sha256(redeemScript)}
function p2wsh(a, opts) {
if (!a.address && !a.hash && !a.output && !a.redeem && !a.witness)
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),
hash: types_1.typeforce.maybe(types_1.typeforce.BufferN(32)),
output: types_1.typeforce.maybe(types_1.typeforce.BufferN(34)),
redeem: types_1.typeforce.maybe({
input: types_1.typeforce.maybe(types_1.typeforce.Buffer),
network: types_1.typeforce.maybe(types_1.typeforce.Object),
output: types_1.typeforce.maybe(types_1.typeforce.Buffer),
witness: types_1.typeforce.maybe(
types_1.typeforce.arrayOf(types_1.typeforce.Buffer),
),
}),
input: types_1.typeforce.maybe(types_1.typeforce.BufferN(0)),
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 _rchunks = lazy.value(() => {
return bscript.decompile(a.redeem.input);
});
let network = a.network;
if (!network) {
network = (a.redeem && a.redeem.network) || networks_1.bitcoin;
}
const o = { 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);
if (a.address) return _address().data;
if (o.redeem && o.redeem.output) return bcrypto.sha256(o.redeem.output);
});
lazy.prop(o, 'output', () => {
if (!o.hash) return;
return bscript.compile([OPS.OP_0, o.hash]);
});
lazy.prop(o, 'redeem', () => {
if (!a.witness) return;
return {
output: a.witness[a.witness.length - 1],
input: EMPTY_BUFFER,
witness: a.witness.slice(0, -1),
};
});
lazy.prop(o, 'input', () => {
if (!o.witness) return;
return EMPTY_BUFFER;
});
lazy.prop(o, 'witness', () => {
// transform redeem input to witness stack?
if (
a.redeem &&
a.redeem.input &&
a.redeem.input.length > 0 &&
a.redeem.output &&
a.redeem.output.length > 0
) {
const stack = bscript.toStack(_rchunks());
// assign, and blank the existing input
o.redeem = Object.assign({ witness: stack }, a.redeem);
o.redeem.input = EMPTY_BUFFER;
return [].concat(stack, a.redeem.output);
}
if (!a.redeem) return;
if (!a.redeem.output) return;
if (!a.redeem.witness) return;
return [].concat(a.redeem.witness, a.redeem.output);
});
lazy.prop(o, 'name', () => {
const nameParts = ['p2wsh'];
if (o.redeem !== undefined && o.redeem.name !== undefined)
nameParts.push(o.redeem.name);
return nameParts.join('-');
});
// extended validation
if (opts.validate) {
let hash = Buffer.from([]);
if (a.address) {
if (_address().prefix !== network.bech32)
throw new TypeError('Invalid prefix or Network mismatch');
if (_address().version !== 0x00)
throw new TypeError('Invalid address version');
if (_address().data.length !== 32)
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 !== 34 ||
a.output[0] !== OPS.OP_0 ||
a.output[1] !== 0x20
)
throw new TypeError('Output is invalid');
const hash2 = a.output.slice(2);
if (hash.length > 0 && !hash.equals(hash2))
throw new TypeError('Hash mismatch');
else hash = hash2;
}
if (a.redeem) {
if (a.redeem.network && a.redeem.network !== network)
throw new TypeError('Network mismatch');
// is there two redeem sources?
if (
a.redeem.input &&
a.redeem.input.length > 0 &&
a.redeem.witness &&
a.redeem.witness.length > 0
)
throw new TypeError('Ambiguous witness source');
// is the redeem output non-empty/valid?
if (a.redeem.output) {
const decompile = bscript.decompile(a.redeem.output);
if (!decompile || decompile.length < 1)
throw new TypeError('Redeem.output is invalid');
if (a.redeem.output.byteLength > 3600)
throw new TypeError(
'Redeem.output unspendable if larger than 3600 bytes',
);
if (bscript.countNonPushOnlyOPs(decompile) > 201)
throw new TypeError(
'Redeem.output unspendable with more than 201 non-push ops',
);
// match hash against other sources
const hash2 = bcrypto.sha256(a.redeem.output);
if (hash.length > 0 && !hash.equals(hash2))
throw new TypeError('Hash mismatch');
else hash = hash2;
}
if (a.redeem.input && !bscript.isPushOnly(_rchunks()))
throw new TypeError('Non push-only scriptSig');
if (
a.witness &&
a.redeem.witness &&
!stacksEqual(a.witness, a.redeem.witness)
)
throw new TypeError('Witness and redeem.witness mismatch');
if (
(a.redeem.input && _rchunks().some(chunkHasUncompressedPubkey)) ||
(a.redeem.output &&
(bscript.decompile(a.redeem.output) || []).some(
chunkHasUncompressedPubkey,
))
) {
throw new TypeError(
'redeem.input or redeem.output contains uncompressed pubkey',
);
}
}
if (a.witness && a.witness.length > 0) {
const wScript = a.witness[a.witness.length - 1];
if (a.redeem && a.redeem.output && !a.redeem.output.equals(wScript))
throw new TypeError('Witness and redeem.output mismatch');
if (
a.witness.some(chunkHasUncompressedPubkey) ||
(bscript.decompile(wScript) || []).some(chunkHasUncompressedPubkey)
)
throw new TypeError('Witness contains uncompressed pubkey');
}
}
return Object.assign(o, a);
}
exports.p2wsh = p2wsh;