@bitgo-beta/utxo-lib
Version:
Client-side Bitcoin JavaScript library
56 lines • 6.6 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.padInputScript = void 0;
const assert = require("assert");
const opcodes = require("bitcoin-ops");
const __1 = require("../");
/**
* @param input - Input of non-standard half-signed transaction created with `tx.build()` instead of `tx.buildIncomplete()`.
* @param signatureIndex - Position to map the existing signatures to. Other signatures will be padded with OP_0.
*/
function padInputScript(input, signatureIndex) {
if (![0, 1, 2].includes(signatureIndex)) {
/* istanbul ignore next */
throw new Error(`invalid signature index: must be one of [0, 1, 2]`);
}
let decompiledSigScript;
if (input.witness && input.witness.length > 0) {
decompiledSigScript = input.witness;
}
else {
decompiledSigScript = __1.script.decompile(input.script);
}
// The shape of a non-standard half-signed input is
// OP_0 <signature> <p2ms>
if (!decompiledSigScript || decompiledSigScript.length !== 3) {
/* istanbul ignore next */
return;
}
const [op0, signatureBuffer, sigScript] = decompiledSigScript;
if (op0 !== opcodes.OP_0 && !(Buffer.isBuffer(op0) && op0.length === 0)) {
/* istanbul ignore next */
return;
}
if (!Buffer.isBuffer(sigScript)) {
/* istanbul ignore next */
return;
}
if (__1.classify.output(sigScript) !== __1.classify.types.P2MS) {
/* istanbul ignore next */
return;
}
const paddedSigScript = [
op0,
...[0, 1, 2].map((i) => (i === signatureIndex ? signatureBuffer : Buffer.from([]))),
sigScript,
];
if (input.witness.length) {
paddedSigScript.forEach((b) => assert(Buffer.isBuffer(b)));
input.witness = paddedSigScript;
}
else {
input.script = __1.script.compile(paddedSigScript);
}
}
exports.padInputScript = padInputScript;
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