@bitgo-beta/utxo-lib
Version:
Client-side Bitcoin JavaScript library
96 lines (94 loc) • 15.1 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.UtxoTransaction = exports.varSliceSize = void 0;
const assert = require("assert");
const bitcoinjs = require("bitcoinjs-lib");
const varuint = require("varuint-bitcoin");
const tnumber_1 = require("./tnumber");
const networks_1 = require("../networks");
function varSliceSize(slice) {
const length = slice.length;
return varuint.encodingLength(length) + length;
}
exports.varSliceSize = varSliceSize;
class UtxoTransaction extends bitcoinjs.Transaction {
constructor(network, transaction, amountType) {
super();
this.network = network;
if (transaction) {
this.version = transaction.version;
this.locktime = transaction.locktime;
this.ins = transaction.ins.map((v) => ({ ...v, witness: [...v.witness] }));
if (transaction.outs.length) {
// amountType only matters if there are outs
const inAmountType = typeof transaction.outs[0].value;
assert(inAmountType === 'number' || inAmountType === 'bigint');
const outAmountType = amountType || inAmountType;
this.outs = transaction.outs.map((v) => ({ ...v, value: tnumber_1.toTNumber(v.value, outAmountType) }));
}
}
}
static newTransaction(network, transaction, amountType) {
return new UtxoTransaction(network, transaction, amountType);
}
static fromBuffer(buf, noStrict, amountType = 'number', network, prevOutput) {
if (!network) {
throw new Error(`must provide network`);
}
return this.newTransaction(network, bitcoinjs.Transaction.fromBuffer(buf, noStrict, amountType), amountType);
}
addForkId(hashType) {
if (hashType & UtxoTransaction.SIGHASH_FORKID) {
const forkId = networks_1.isBitcoinGold(this.network) ? 79 : 0;
return (hashType | (forkId << 8)) >>> 0;
}
return hashType;
}
hashForWitnessV0(inIndex, prevOutScript, value, hashType) {
return super.hashForWitnessV0(inIndex, prevOutScript, value, this.addForkId(hashType));
}
/**
* Calculate the hash to verify the signature against
*/
hashForSignatureByNetwork(inIndex, prevoutScript, value, hashType) {
switch (networks_1.getMainnet(this.network)) {
case networks_1.networks.zcash:
throw new Error(`illegal state`);
case networks_1.networks.bitcoincash:
case networks_1.networks.bitcoinsv:
case networks_1.networks.bitcoingold:
/*
Bitcoin Cash supports a FORKID flag. When set, we hash using hashing algorithm
that is used for segregated witness transactions (defined in BIP143).
The flag is also used by BitcoinSV and BitcoinGold
https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/replay-protected-sighash.md
*/
const addForkId = (hashType & UtxoTransaction.SIGHASH_FORKID) > 0;
if (addForkId) {
/*
``The sighash type is altered to include a 24-bit fork id in its most significant bits.''
We also use unsigned right shift operator `>>>` to cast to UInt32
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift
*/
if (value === undefined) {
throw new Error(`must provide value`);
}
return super.hashForWitnessV0(inIndex, prevoutScript, value, this.addForkId(hashType));
}
}
return super.hashForSignature(inIndex, prevoutScript, hashType);
}
hashForSignature(inIndex, prevOutScript, hashType, value) {
value = value !== null && value !== void 0 ? value : this.ins[inIndex].value;
return this.hashForSignatureByNetwork(inIndex, prevOutScript, value, hashType);
}
clone(amountType) {
// No need to clone. Everything is copied in the constructor.
return new UtxoTransaction(this.network, this, amountType);
}
}
exports.UtxoTransaction = UtxoTransaction;
UtxoTransaction.SIGHASH_FORKID = 0x40;
/** @deprecated use SIGHASH_FORKID */
UtxoTransaction.SIGHASH_BITCOINCASHBIP143 = UtxoTransaction.SIGHASH_FORKID;
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* as assert from 'assert';\nimport * as bitcoinjs from 'bitcoinjs-lib';\nimport * as varuint from 'varuint-bitcoin';\nimport { toTNumber } from './tnumber';\n\nimport { networks, Network, getMainnet, isBitcoinGold } from '../networks';\n\nexport function varSliceSize(slice: Buffer): number {\n  const length = slice.length;\n  return varuint.encodingLength(length) + length;\n}\n\nexport class UtxoTransaction<TNumber extends number | bigint = number> extends bitcoinjs.Transaction<TNumber> {\n  static SIGHASH_FORKID = 0x40;\n  /** @deprecated use SIGHASH_FORKID */\n  static SIGHASH_BITCOINCASHBIP143 = UtxoTransaction.SIGHASH_FORKID;\n\n  constructor(\n    public network: Network,\n    transaction?: bitcoinjs.Transaction<bigint | number>,\n    amountType?: 'bigint' | 'number'\n  ) {\n    super();\n    if (transaction) {\n      this.version = transaction.version;\n      this.locktime = transaction.locktime;\n      this.ins = transaction.ins.map((v) => ({ ...v, witness: [...v.witness] }));\n      if (transaction.outs.length) {\n        // amountType only matters if there are outs\n        const inAmountType = typeof transaction.outs[0].value;\n        assert(inAmountType === 'number' || inAmountType === 'bigint');\n        const outAmountType: 'number' | 'bigint' = amountType || inAmountType;\n        this.outs = transaction.outs.map((v) => ({ ...v, value: toTNumber(v.value, outAmountType) }));\n      }\n    }\n  }\n\n  protected static newTransaction<TNumber extends number | bigint = number>(\n    network: Network,\n    transaction?: bitcoinjs.Transaction<bigint | number>,\n    amountType?: 'number' | 'bigint'\n  ): UtxoTransaction<TNumber> {\n    return new UtxoTransaction<TNumber>(network, transaction, amountType);\n  }\n\n  static fromBuffer<TNumber extends number | bigint = number>(\n    buf: Buffer,\n    noStrict: boolean,\n    amountType: 'number' | 'bigint' = 'number',\n    network?: Network,\n    prevOutput?: bitcoinjs.TxOutput<TNumber>[]\n  ): UtxoTransaction<TNumber> {\n    if (!network) {\n      throw new Error(`must provide network`);\n    }\n    return this.newTransaction<TNumber>(\n      network,\n      bitcoinjs.Transaction.fromBuffer<TNumber>(buf, noStrict, amountType),\n      amountType\n    );\n  }\n\n  addForkId(hashType: number): number {\n    if (hashType & UtxoTransaction.SIGHASH_FORKID) {\n      const forkId = isBitcoinGold(this.network) ? 79 : 0;\n      return (hashType | (forkId << 8)) >>> 0;\n    }\n\n    return hashType;\n  }\n\n  hashForWitnessV0(inIndex: number, prevOutScript: Buffer, value: TNumber, hashType: number): Buffer {\n    return super.hashForWitnessV0(inIndex, prevOutScript, value, this.addForkId(hashType));\n  }\n\n  /**\n   * Calculate the hash to verify the signature against\n   */\n  hashForSignatureByNetwork(\n    inIndex: number,\n    prevoutScript: Buffer,\n    value: TNumber | undefined,\n    hashType: number\n  ): Buffer {\n    switch (getMainnet(this.network)) {\n      case networks.zcash:\n        throw new Error(`illegal state`);\n      case networks.bitcoincash:\n      case networks.bitcoinsv:\n      case networks.bitcoingold:\n        /*\n          Bitcoin Cash supports a FORKID flag. When set, we hash using hashing algorithm\n           that is used for segregated witness transactions (defined in BIP143).\n\n          The flag is also used by BitcoinSV and BitcoinGold\n\n          https://github.com/bitcoincashorg/bitcoincash.org/blob/master/spec/replay-protected-sighash.md\n         */\n        const addForkId = (hashType & UtxoTransaction.SIGHASH_FORKID) > 0;\n\n        if (addForkId) {\n          /*\n            ``The sighash type is altered to include a 24-bit fork id in its most significant bits.''\n            We also use unsigned right shift operator `>>>` to cast to UInt32\n            https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Unsigned_right_shift\n           */\n          if (value === undefined) {\n            throw new Error(`must provide value`);\n          }\n          return super.hashForWitnessV0(inIndex, prevoutScript, value, this.addForkId(hashType));\n        }\n    }\n\n    return super.hashForSignature(inIndex, prevoutScript, hashType);\n  }\n\n  hashForSignature(inIndex: number, prevOutScript: Buffer, hashType: number, value?: TNumber): Buffer {\n    value = value ?? (this.ins[inIndex] as any).value;\n    return this.hashForSignatureByNetwork(inIndex, prevOutScript, value, hashType);\n  }\n\n  clone<TN2 extends bigint | number = TNumber>(amountType?: 'number' | 'bigint'): UtxoTransaction<TN2> {\n    // No need to clone. Everything is copied in the constructor.\n    return new UtxoTransaction<TN2>(this.network, this, amountType);\n  }\n}\n"]}