bitcoinjs-lib
Version:
Client-side Bitcoin JavaScript library
199 lines (198 loc) • 6.98 kB
JavaScript
;
Object.defineProperty(exports, '__esModule', { value: true });
exports.p2sh = 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 bs58check = require('bs58check');
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]);
});
}
// input: [redeemScriptSig ...] {redeemScript}
// witness: <?>
// output: OP_HASH160 {hash160(redeemScript)} OP_EQUAL
function p2sh(a, opts) {
if (!a.address && !a.hash && !a.output && !a.redeem && !a.input)
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(20)),
output: types_1.typeforce.maybe(types_1.typeforce.BufferN(23)),
redeem: types_1.typeforce.maybe({
network: types_1.typeforce.maybe(types_1.typeforce.Object),
output: types_1.typeforce.maybe(types_1.typeforce.Buffer),
input: 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.Buffer),
witness: types_1.typeforce.maybe(
types_1.typeforce.arrayOf(types_1.typeforce.Buffer),
),
},
a,
);
let network = a.network;
if (!network) {
network = (a.redeem && a.redeem.network) || networks_1.bitcoin;
}
const o = { network };
const _address = lazy.value(() => {
const payload = Buffer.from(bs58check.decode(a.address));
const version = payload.readUInt8(0);
const hash = payload.slice(1);
return { version, hash };
});
const _chunks = lazy.value(() => {
return bscript.decompile(a.input);
});
const _redeem = lazy.value(() => {
const chunks = _chunks();
const lastChunk = chunks[chunks.length - 1];
return {
network,
output: lastChunk === OPS.OP_FALSE ? Buffer.from([]) : lastChunk,
input: bscript.compile(chunks.slice(0, -1)),
witness: a.witness || [],
};
});
// output dependents
lazy.prop(o, 'address', () => {
if (!o.hash) return;
const payload = Buffer.allocUnsafe(21);
payload.writeUInt8(o.network.scriptHash, 0);
o.hash.copy(payload, 1);
return bs58check.encode(payload);
});
lazy.prop(o, 'hash', () => {
// in order of least effort
if (a.output) return a.output.slice(2, 22);
if (a.address) return _address().hash;
if (o.redeem && o.redeem.output) return bcrypto.hash160(o.redeem.output);
});
lazy.prop(o, 'output', () => {
if (!o.hash) return;
return bscript.compile([OPS.OP_HASH160, o.hash, OPS.OP_EQUAL]);
});
// input dependents
lazy.prop(o, 'redeem', () => {
if (!a.input) return;
return _redeem();
});
lazy.prop(o, 'input', () => {
if (!a.redeem || !a.redeem.input || !a.redeem.output) return;
return bscript.compile(
[].concat(bscript.decompile(a.redeem.input), a.redeem.output),
);
});
lazy.prop(o, 'witness', () => {
if (o.redeem && o.redeem.witness) return o.redeem.witness;
if (o.input) return [];
});
lazy.prop(o, 'name', () => {
const nameParts = ['p2sh'];
if (o.redeem !== undefined && o.redeem.name !== undefined)
nameParts.push(o.redeem.name);
return nameParts.join('-');
});
if (opts.validate) {
let hash = Buffer.from([]);
if (a.address) {
if (_address().version !== network.scriptHash)
throw new TypeError('Invalid version or Network mismatch');
if (_address().hash.length !== 20) throw new TypeError('Invalid address');
hash = _address().hash;
}
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 !== 23 ||
a.output[0] !== OPS.OP_HASH160 ||
a.output[1] !== 0x14 ||
a.output[22] !== OPS.OP_EQUAL
)
throw new TypeError('Output is invalid');
const hash2 = a.output.slice(2, 22);
if (hash.length > 0 && !hash.equals(hash2))
throw new TypeError('Hash mismatch');
else hash = hash2;
}
// inlined to prevent 'no-inner-declarations' failing
const checkRedeem = redeem => {
// is the redeem output empty/invalid?
if (redeem.output) {
const decompile = bscript.decompile(redeem.output);
if (!decompile || decompile.length < 1)
throw new TypeError('Redeem.output too short');
if (redeem.output.byteLength > 520)
throw new TypeError(
'Redeem.output unspendable if larger than 520 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.hash160(redeem.output);
if (hash.length > 0 && !hash.equals(hash2))
throw new TypeError('Hash mismatch');
else hash = hash2;
}
if (redeem.input) {
const hasInput = redeem.input.length > 0;
const hasWitness = redeem.witness && redeem.witness.length > 0;
if (!hasInput && !hasWitness) throw new TypeError('Empty input');
if (hasInput && hasWitness)
throw new TypeError('Input and witness provided');
if (hasInput) {
const richunks = bscript.decompile(redeem.input);
if (!bscript.isPushOnly(richunks))
throw new TypeError('Non push-only scriptSig');
}
}
};
if (a.input) {
const chunks = _chunks();
if (!chunks || chunks.length < 1) throw new TypeError('Input too short');
if (!Buffer.isBuffer(_redeem().output))
throw new TypeError('Input is invalid');
checkRedeem(_redeem());
}
if (a.redeem) {
if (a.redeem.network && a.redeem.network !== network)
throw new TypeError('Network mismatch');
if (a.input) {
const redeem = _redeem();
if (a.redeem.output && !a.redeem.output.equals(redeem.output))
throw new TypeError('Redeem.output mismatch');
if (a.redeem.input && !a.redeem.input.equals(redeem.input))
throw new TypeError('Redeem.input mismatch');
}
checkRedeem(a.redeem);
}
if (a.witness) {
if (
a.redeem &&
a.redeem.witness &&
!stacksEqual(a.redeem.witness, a.witness)
)
throw new TypeError('Witness and redeem.witness mismatch');
}
}
return Object.assign(o, a);
}
exports.p2sh = p2sh;