979 lines
27 KiB
TypeScript
979 lines
27 KiB
TypeScript
import * as baddress from './address';
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import { reverseBuffer } from './bufferutils';
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import * as classify from './classify';
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import * as bcrypto from './crypto';
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import { ECPairInterface } from './ecpair';
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import * as ECPair from './ecpair';
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import { Network } from './networks';
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import * as networks from './networks';
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import { Payment } from './payments';
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import * as payments from './payments';
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import * as bscript from './script';
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import { OPS as ops } from './script';
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import { Output, Transaction } from './transaction';
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import * as types from './types';
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const typeforce = require('typeforce');
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const SCRIPT_TYPES = classify.types;
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type MaybeBuffer = Buffer | undefined;
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type TxbSignatures = Buffer[] | MaybeBuffer[];
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type TxbPubkeys = MaybeBuffer[];
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type TxbWitness = Buffer[];
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type TxbScriptType = string;
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type TxbScript = Buffer;
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interface TxbInput {
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value?: number;
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hasWitness?: boolean;
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signScript?: TxbScript;
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signType?: TxbScriptType;
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prevOutScript?: TxbScript;
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redeemScript?: TxbScript;
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redeemScriptType?: TxbScriptType;
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prevOutType?: TxbScriptType;
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pubkeys?: TxbPubkeys;
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signatures?: TxbSignatures;
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witness?: TxbWitness;
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witnessScript?: TxbScript;
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witnessScriptType?: TxbScriptType;
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script?: TxbScript;
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sequence?: number;
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scriptSig?: TxbScript;
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maxSignatures?: number;
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}
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interface TxbOutput {
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type: string;
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pubkeys?: TxbPubkeys;
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signatures?: TxbSignatures;
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maxSignatures?: number;
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}
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function txIsString(tx: Buffer | string | Transaction): tx is string {
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return typeof tx === 'string' || tx instanceof String;
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}
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function txIsTransaction(tx: Buffer | string | Transaction): tx is Transaction {
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return tx instanceof Transaction;
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}
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export class TransactionBuilder {
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static fromTransaction(
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transaction: Transaction,
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network?: Network,
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): TransactionBuilder {
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const txb = new TransactionBuilder(network);
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// Copy transaction fields
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txb.setVersion(transaction.version);
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txb.setLockTime(transaction.locktime);
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// Copy outputs (done first to avoid signature invalidation)
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transaction.outs.forEach(txOut => {
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txb.addOutput(txOut.script, (txOut as Output).value);
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});
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// Copy inputs
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transaction.ins.forEach(txIn => {
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txb.__addInputUnsafe(txIn.hash, txIn.index, {
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sequence: txIn.sequence,
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script: txIn.script,
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witness: txIn.witness,
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});
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});
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// fix some things not possible through the public API
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txb.__INPUTS.forEach((input, i) => {
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fixMultisigOrder(input, transaction, i);
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});
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return txb;
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}
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private __PREV_TX_SET: { [index: string]: boolean };
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private __INPUTS: TxbInput[];
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private __TX: Transaction;
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private __USE_LOW_R: boolean;
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// WARNING: maximumFeeRate is __NOT__ to be relied on,
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// it's just another potential safety mechanism (safety in-depth)
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constructor(
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public network: Network = networks.bitcoin,
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public maximumFeeRate: number = 2500,
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) {
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this.__PREV_TX_SET = {};
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this.__INPUTS = [];
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this.__TX = new Transaction();
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this.__TX.version = 2;
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this.__USE_LOW_R = false;
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}
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setLowR(setting?: boolean): boolean {
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typeforce(typeforce.maybe(typeforce.Boolean), setting);
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if (setting === undefined) {
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setting = true;
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}
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this.__USE_LOW_R = setting;
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return setting;
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}
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setLockTime(locktime: number): void {
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typeforce(types.UInt32, locktime);
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// if any signatures exist, throw
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if (
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this.__INPUTS.some(input => {
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if (!input.signatures) return false;
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return input.signatures.some(s => s !== undefined);
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})
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) {
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throw new Error('No, this would invalidate signatures');
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}
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this.__TX.locktime = locktime;
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}
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setVersion(version: number): void {
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typeforce(types.UInt32, version);
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// XXX: this might eventually become more complex depending on what the versions represent
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this.__TX.version = version;
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}
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addInput(
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txHash: Buffer | string | Transaction,
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vout: number,
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sequence?: number,
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prevOutScript?: Buffer,
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): number {
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if (!this.__canModifyInputs()) {
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throw new Error('No, this would invalidate signatures');
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}
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let value: number | undefined;
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// is it a hex string?
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if (txIsString(txHash)) {
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// transaction hashs's are displayed in reverse order, un-reverse it
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txHash = reverseBuffer(Buffer.from(txHash, 'hex'));
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// is it a Transaction object?
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} else if (txIsTransaction(txHash)) {
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const txOut = txHash.outs[vout];
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prevOutScript = txOut.script;
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value = (txOut as Output).value;
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txHash = txHash.getHash(false) as Buffer;
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}
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return this.__addInputUnsafe(txHash, vout, {
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sequence,
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prevOutScript,
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value,
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});
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}
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addOutput(scriptPubKey: string | Buffer, value: number): number {
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if (!this.__canModifyOutputs()) {
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throw new Error('No, this would invalidate signatures');
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}
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// Attempt to get a script if it's a base58 or bech32 address string
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if (typeof scriptPubKey === 'string') {
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scriptPubKey = baddress.toOutputScript(scriptPubKey, this.network);
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}
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return this.__TX.addOutput(scriptPubKey, value);
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}
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build(): Transaction {
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return this.__build(false);
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}
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buildIncomplete(): Transaction {
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return this.__build(true);
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}
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sign(
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vin: number,
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keyPair: ECPairInterface,
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redeemScript?: Buffer,
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hashType?: number,
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witnessValue?: number,
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witnessScript?: Buffer,
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): void {
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// TODO: remove keyPair.network matching in 4.0.0
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if (keyPair.network && keyPair.network !== this.network)
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throw new TypeError('Inconsistent network');
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if (!this.__INPUTS[vin]) throw new Error('No input at index: ' + vin);
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hashType = hashType || Transaction.SIGHASH_ALL;
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if (this.__needsOutputs(hashType))
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throw new Error('Transaction needs outputs');
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const input = this.__INPUTS[vin];
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// if redeemScript was previously provided, enforce consistency
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if (
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input.redeemScript !== undefined &&
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redeemScript &&
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!input.redeemScript.equals(redeemScript)
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) {
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throw new Error('Inconsistent redeemScript');
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}
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const ourPubKey = keyPair.publicKey || keyPair.getPublicKey!();
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if (!canSign(input)) {
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if (witnessValue !== undefined) {
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if (input.value !== undefined && input.value !== witnessValue)
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throw new Error('Input did not match witnessValue');
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typeforce(types.Satoshi, witnessValue);
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input.value = witnessValue;
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}
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if (!canSign(input)) {
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const prepared = prepareInput(
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input,
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ourPubKey,
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redeemScript,
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witnessScript,
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);
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// updates inline
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Object.assign(input, prepared);
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}
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if (!canSign(input)) throw Error(input.prevOutType + ' not supported');
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}
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// ready to sign
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let signatureHash: Buffer;
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if (input.hasWitness) {
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signatureHash = this.__TX.hashForWitnessV0(
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vin,
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input.signScript as Buffer,
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input.value as number,
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hashType,
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);
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} else {
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signatureHash = this.__TX.hashForSignature(
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vin,
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input.signScript as Buffer,
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hashType,
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);
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}
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// enforce in order signing of public keys
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const signed = input.pubkeys!.some((pubKey, i) => {
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if (!ourPubKey.equals(pubKey!)) return false;
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if (input.signatures![i]) throw new Error('Signature already exists');
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// TODO: add tests
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if (ourPubKey.length !== 33 && input.hasWitness) {
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throw new Error(
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'BIP143 rejects uncompressed public keys in P2WPKH or P2WSH',
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);
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}
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const signature = keyPair.sign(signatureHash, this.__USE_LOW_R);
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input.signatures![i] = bscript.signature.encode(signature, hashType!);
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return true;
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});
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if (!signed) throw new Error('Key pair cannot sign for this input');
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}
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private __addInputUnsafe(
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txHash: Buffer,
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vout: number,
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options: TxbInput,
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): number {
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if (Transaction.isCoinbaseHash(txHash)) {
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throw new Error('coinbase inputs not supported');
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}
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const prevTxOut = txHash.toString('hex') + ':' + vout;
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if (this.__PREV_TX_SET[prevTxOut] !== undefined)
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throw new Error('Duplicate TxOut: ' + prevTxOut);
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let input: TxbInput = {};
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// derive what we can from the scriptSig
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if (options.script !== undefined) {
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input = expandInput(options.script, options.witness || []);
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}
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// if an input value was given, retain it
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if (options.value !== undefined) {
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input.value = options.value;
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}
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// derive what we can from the previous transactions output script
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if (!input.prevOutScript && options.prevOutScript) {
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let prevOutType;
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if (!input.pubkeys && !input.signatures) {
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const expanded = expandOutput(options.prevOutScript);
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if (expanded.pubkeys) {
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input.pubkeys = expanded.pubkeys;
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input.signatures = expanded.signatures;
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}
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prevOutType = expanded.type;
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}
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input.prevOutScript = options.prevOutScript;
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input.prevOutType = prevOutType || classify.output(options.prevOutScript);
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}
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const vin = this.__TX.addInput(
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txHash,
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vout,
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options.sequence,
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options.scriptSig,
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);
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this.__INPUTS[vin] = input;
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this.__PREV_TX_SET[prevTxOut] = true;
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return vin;
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}
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private __build(allowIncomplete?: boolean): Transaction {
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if (!allowIncomplete) {
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if (!this.__TX.ins.length) throw new Error('Transaction has no inputs');
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if (!this.__TX.outs.length) throw new Error('Transaction has no outputs');
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}
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const tx = this.__TX.clone();
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// create script signatures from inputs
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this.__INPUTS.forEach((input, i) => {
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if (!input.prevOutType && !allowIncomplete)
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throw new Error('Transaction is not complete');
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const result = build(input.prevOutType!, input, allowIncomplete);
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if (!result) {
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if (!allowIncomplete && input.prevOutType === SCRIPT_TYPES.NONSTANDARD)
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throw new Error('Unknown input type');
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if (!allowIncomplete) throw new Error('Not enough information');
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return;
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}
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tx.setInputScript(i, result.input!);
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tx.setWitness(i, result.witness!);
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});
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if (!allowIncomplete) {
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// do not rely on this, its merely a last resort
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if (this.__overMaximumFees(tx.virtualSize())) {
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throw new Error('Transaction has absurd fees');
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}
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}
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return tx;
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}
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private __canModifyInputs(): boolean {
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return this.__INPUTS.every(input => {
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if (!input.signatures) return true;
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return input.signatures.every(signature => {
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if (!signature) return true;
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const hashType = signatureHashType(signature);
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// if SIGHASH_ANYONECANPAY is set, signatures would not
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// be invalidated by more inputs
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return (hashType & Transaction.SIGHASH_ANYONECANPAY) !== 0;
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});
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});
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}
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private __needsOutputs(signingHashType: number): boolean {
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if (signingHashType === Transaction.SIGHASH_ALL) {
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return this.__TX.outs.length === 0;
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}
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// if inputs are being signed with SIGHASH_NONE, we don't strictly need outputs
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// .build() will fail, but .buildIncomplete() is OK
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return (
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this.__TX.outs.length === 0 &&
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this.__INPUTS.some(input => {
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if (!input.signatures) return false;
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return input.signatures.some(signature => {
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if (!signature) return false; // no signature, no issue
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const hashType = signatureHashType(signature);
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if (hashType & Transaction.SIGHASH_NONE) return false; // SIGHASH_NONE doesn't care about outputs
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return true; // SIGHASH_* does care
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});
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})
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);
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}
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private __canModifyOutputs(): boolean {
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const nInputs = this.__TX.ins.length;
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const nOutputs = this.__TX.outs.length;
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return this.__INPUTS.every(input => {
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if (input.signatures === undefined) return true;
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return input.signatures.every(signature => {
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if (!signature) return true;
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const hashType = signatureHashType(signature);
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const hashTypeMod = hashType & 0x1f;
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if (hashTypeMod === Transaction.SIGHASH_NONE) return true;
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if (hashTypeMod === Transaction.SIGHASH_SINGLE) {
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// if SIGHASH_SINGLE is set, and nInputs > nOutputs
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// some signatures would be invalidated by the addition
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// of more outputs
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return nInputs <= nOutputs;
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}
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return false;
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});
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});
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}
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private __overMaximumFees(bytes: number): boolean {
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// not all inputs will have .value defined
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const incoming = this.__INPUTS.reduce((a, x) => a + (x.value! >>> 0), 0);
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// but all outputs do, and if we have any input value
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// we can immediately determine if the outputs are too small
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const outgoing = this.__TX.outs.reduce(
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(a, x) => a + (x as Output).value,
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0,
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);
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const fee = incoming - outgoing;
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const feeRate = fee / bytes;
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return feeRate > this.maximumFeeRate;
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}
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}
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function expandInput(
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scriptSig: Buffer,
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witnessStack: Buffer[],
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type?: string,
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scriptPubKey?: Buffer,
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): TxbInput {
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if (scriptSig.length === 0 && witnessStack.length === 0) return {};
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if (!type) {
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let ssType: string | undefined = classify.input(scriptSig, true);
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let wsType: string | undefined = classify.witness(witnessStack, true);
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if (ssType === SCRIPT_TYPES.NONSTANDARD) ssType = undefined;
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if (wsType === SCRIPT_TYPES.NONSTANDARD) wsType = undefined;
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type = ssType || wsType;
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}
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switch (type) {
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case SCRIPT_TYPES.P2WPKH: {
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const { output, pubkey, signature } = payments.p2wpkh({
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witness: witnessStack,
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});
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return {
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prevOutScript: output,
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prevOutType: SCRIPT_TYPES.P2WPKH,
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pubkeys: [pubkey],
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signatures: [signature],
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};
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}
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case SCRIPT_TYPES.P2PKH: {
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const { output, pubkey, signature } = payments.p2pkh({
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input: scriptSig,
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});
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return {
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prevOutScript: output,
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prevOutType: SCRIPT_TYPES.P2PKH,
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pubkeys: [pubkey],
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signatures: [signature],
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};
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}
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case SCRIPT_TYPES.P2PK: {
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const { signature } = payments.p2pk({ input: scriptSig });
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return {
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prevOutType: SCRIPT_TYPES.P2PK,
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pubkeys: [undefined],
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signatures: [signature],
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};
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}
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case SCRIPT_TYPES.P2MS: {
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const { m, pubkeys, signatures } = payments.p2ms(
|
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{
|
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input: scriptSig,
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output: scriptPubKey,
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},
|
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{ allowIncomplete: true },
|
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);
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return {
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prevOutType: SCRIPT_TYPES.P2MS,
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pubkeys,
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signatures,
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maxSignatures: m,
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};
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}
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}
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if (type === SCRIPT_TYPES.P2SH) {
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const { output, redeem } = payments.p2sh({
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input: scriptSig,
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witness: witnessStack,
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});
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const outputType = classify.output(redeem!.output!);
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const expanded = expandInput(
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redeem!.input!,
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redeem!.witness!,
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outputType,
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redeem!.output,
|
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);
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if (!expanded.prevOutType) return {};
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return {
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prevOutScript: output,
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prevOutType: SCRIPT_TYPES.P2SH,
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redeemScript: redeem!.output,
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redeemScriptType: expanded.prevOutType,
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witnessScript: expanded.witnessScript,
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witnessScriptType: expanded.witnessScriptType,
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pubkeys: expanded.pubkeys,
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signatures: expanded.signatures,
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};
|
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}
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if (type === SCRIPT_TYPES.P2WSH) {
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const { output, redeem } = payments.p2wsh({
|
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input: scriptSig,
|
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witness: witnessStack,
|
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});
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const outputType = classify.output(redeem!.output!);
|
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let expanded;
|
|
if (outputType === SCRIPT_TYPES.P2WPKH) {
|
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expanded = expandInput(redeem!.input!, redeem!.witness!, outputType);
|
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} else {
|
|
expanded = expandInput(
|
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bscript.compile(redeem!.witness!),
|
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[],
|
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outputType,
|
|
redeem!.output,
|
|
);
|
|
}
|
|
if (!expanded.prevOutType) return {};
|
|
|
|
return {
|
|
prevOutScript: output,
|
|
prevOutType: SCRIPT_TYPES.P2WSH,
|
|
witnessScript: redeem!.output,
|
|
witnessScriptType: expanded.prevOutType,
|
|
|
|
pubkeys: expanded.pubkeys,
|
|
signatures: expanded.signatures,
|
|
};
|
|
}
|
|
|
|
return {
|
|
prevOutType: SCRIPT_TYPES.NONSTANDARD,
|
|
prevOutScript: scriptSig,
|
|
};
|
|
}
|
|
|
|
// could be done in expandInput, but requires the original Transaction for hashForSignature
|
|
function fixMultisigOrder(
|
|
input: TxbInput,
|
|
transaction: Transaction,
|
|
vin: number,
|
|
): void {
|
|
if (input.redeemScriptType !== SCRIPT_TYPES.P2MS || !input.redeemScript)
|
|
return;
|
|
if (input.pubkeys!.length === input.signatures!.length) return;
|
|
|
|
const unmatched = input.signatures!.concat();
|
|
|
|
input.signatures = input.pubkeys!.map(pubKey => {
|
|
const keyPair = ECPair.fromPublicKey(pubKey!);
|
|
let match: Buffer | undefined;
|
|
|
|
// check for a signature
|
|
unmatched.some((signature, i) => {
|
|
// skip if undefined || OP_0
|
|
if (!signature) return false;
|
|
|
|
// TODO: avoid O(n) hashForSignature
|
|
const parsed = bscript.signature.decode(signature);
|
|
const hash = transaction.hashForSignature(
|
|
vin,
|
|
input.redeemScript!,
|
|
parsed.hashType,
|
|
);
|
|
|
|
// skip if signature does not match pubKey
|
|
if (!keyPair.verify(hash, parsed.signature)) return false;
|
|
|
|
// remove matched signature from unmatched
|
|
unmatched[i] = undefined;
|
|
match = signature;
|
|
|
|
return true;
|
|
});
|
|
|
|
return match;
|
|
});
|
|
}
|
|
|
|
function expandOutput(script: Buffer, ourPubKey?: Buffer): TxbOutput {
|
|
typeforce(types.Buffer, script);
|
|
const type = classify.output(script);
|
|
|
|
switch (type) {
|
|
case SCRIPT_TYPES.P2PKH: {
|
|
if (!ourPubKey) return { type };
|
|
|
|
// does our hash160(pubKey) match the output scripts?
|
|
const pkh1 = payments.p2pkh({ output: script }).hash;
|
|
const pkh2 = bcrypto.hash160(ourPubKey);
|
|
if (!pkh1!.equals(pkh2)) return { type };
|
|
|
|
return {
|
|
type,
|
|
pubkeys: [ourPubKey],
|
|
signatures: [undefined],
|
|
};
|
|
}
|
|
|
|
case SCRIPT_TYPES.P2WPKH: {
|
|
if (!ourPubKey) return { type };
|
|
|
|
// does our hash160(pubKey) match the output scripts?
|
|
const wpkh1 = payments.p2wpkh({ output: script }).hash;
|
|
const wpkh2 = bcrypto.hash160(ourPubKey);
|
|
if (!wpkh1!.equals(wpkh2)) return { type };
|
|
|
|
return {
|
|
type,
|
|
pubkeys: [ourPubKey],
|
|
signatures: [undefined],
|
|
};
|
|
}
|
|
|
|
case SCRIPT_TYPES.P2PK: {
|
|
const p2pk = payments.p2pk({ output: script });
|
|
return {
|
|
type,
|
|
pubkeys: [p2pk.pubkey],
|
|
signatures: [undefined],
|
|
};
|
|
}
|
|
|
|
case SCRIPT_TYPES.P2MS: {
|
|
const p2ms = payments.p2ms({ output: script });
|
|
return {
|
|
type,
|
|
pubkeys: p2ms.pubkeys,
|
|
signatures: p2ms.pubkeys!.map((): undefined => undefined),
|
|
maxSignatures: p2ms.m,
|
|
};
|
|
}
|
|
}
|
|
|
|
return { type };
|
|
}
|
|
|
|
function prepareInput(
|
|
input: TxbInput,
|
|
ourPubKey: Buffer,
|
|
redeemScript?: Buffer,
|
|
witnessScript?: Buffer,
|
|
): TxbInput {
|
|
if (redeemScript && witnessScript) {
|
|
const p2wsh = payments.p2wsh({
|
|
redeem: { output: witnessScript },
|
|
}) as Payment;
|
|
const p2wshAlt = payments.p2wsh({ output: redeemScript }) as Payment;
|
|
const p2sh = payments.p2sh({ redeem: { output: redeemScript } }) as Payment;
|
|
const p2shAlt = payments.p2sh({ redeem: p2wsh }) as Payment;
|
|
|
|
// enforces P2SH(P2WSH(...))
|
|
if (!p2wsh.hash!.equals(p2wshAlt.hash!))
|
|
throw new Error('Witness script inconsistent with prevOutScript');
|
|
if (!p2sh.hash!.equals(p2shAlt.hash!))
|
|
throw new Error('Redeem script inconsistent with prevOutScript');
|
|
|
|
const expanded = expandOutput(p2wsh.redeem!.output!, ourPubKey);
|
|
if (!expanded.pubkeys)
|
|
throw new Error(
|
|
expanded.type +
|
|
' not supported as witnessScript (' +
|
|
bscript.toASM(witnessScript) +
|
|
')',
|
|
);
|
|
if (input.signatures && input.signatures.some(x => x !== undefined)) {
|
|
expanded.signatures = input.signatures;
|
|
}
|
|
|
|
const signScript = witnessScript;
|
|
if (expanded.type === SCRIPT_TYPES.P2WPKH)
|
|
throw new Error('P2SH(P2WSH(P2WPKH)) is a consensus failure');
|
|
|
|
return {
|
|
redeemScript,
|
|
redeemScriptType: SCRIPT_TYPES.P2WSH,
|
|
|
|
witnessScript,
|
|
witnessScriptType: expanded.type,
|
|
|
|
prevOutType: SCRIPT_TYPES.P2SH,
|
|
prevOutScript: p2sh.output,
|
|
|
|
hasWitness: true,
|
|
signScript,
|
|
signType: expanded.type,
|
|
|
|
pubkeys: expanded.pubkeys,
|
|
signatures: expanded.signatures,
|
|
maxSignatures: expanded.maxSignatures,
|
|
};
|
|
}
|
|
|
|
if (redeemScript) {
|
|
const p2sh = payments.p2sh({ redeem: { output: redeemScript } }) as Payment;
|
|
|
|
if (input.prevOutScript) {
|
|
let p2shAlt;
|
|
try {
|
|
p2shAlt = payments.p2sh({ output: input.prevOutScript }) as Payment;
|
|
} catch (e) {
|
|
throw new Error('PrevOutScript must be P2SH');
|
|
}
|
|
if (!p2sh.hash!.equals(p2shAlt.hash!))
|
|
throw new Error('Redeem script inconsistent with prevOutScript');
|
|
}
|
|
|
|
const expanded = expandOutput(p2sh.redeem!.output!, ourPubKey);
|
|
if (!expanded.pubkeys)
|
|
throw new Error(
|
|
expanded.type +
|
|
' not supported as redeemScript (' +
|
|
bscript.toASM(redeemScript) +
|
|
')',
|
|
);
|
|
if (input.signatures && input.signatures.some(x => x !== undefined)) {
|
|
expanded.signatures = input.signatures;
|
|
}
|
|
|
|
let signScript = redeemScript;
|
|
if (expanded.type === SCRIPT_TYPES.P2WPKH) {
|
|
signScript = payments.p2pkh({ pubkey: expanded.pubkeys[0] }).output!;
|
|
}
|
|
|
|
return {
|
|
redeemScript,
|
|
redeemScriptType: expanded.type,
|
|
|
|
prevOutType: SCRIPT_TYPES.P2SH,
|
|
prevOutScript: p2sh.output,
|
|
|
|
hasWitness: expanded.type === SCRIPT_TYPES.P2WPKH,
|
|
signScript,
|
|
signType: expanded.type,
|
|
|
|
pubkeys: expanded.pubkeys,
|
|
signatures: expanded.signatures,
|
|
maxSignatures: expanded.maxSignatures,
|
|
};
|
|
}
|
|
|
|
if (witnessScript) {
|
|
const p2wsh = payments.p2wsh({ redeem: { output: witnessScript } });
|
|
|
|
if (input.prevOutScript) {
|
|
const p2wshAlt = payments.p2wsh({ output: input.prevOutScript });
|
|
if (!p2wsh.hash!.equals(p2wshAlt.hash!))
|
|
throw new Error('Witness script inconsistent with prevOutScript');
|
|
}
|
|
|
|
const expanded = expandOutput(p2wsh.redeem!.output!, ourPubKey);
|
|
if (!expanded.pubkeys)
|
|
throw new Error(
|
|
expanded.type +
|
|
' not supported as witnessScript (' +
|
|
bscript.toASM(witnessScript) +
|
|
')',
|
|
);
|
|
if (input.signatures && input.signatures.some(x => x !== undefined)) {
|
|
expanded.signatures = input.signatures;
|
|
}
|
|
|
|
const signScript = witnessScript;
|
|
if (expanded.type === SCRIPT_TYPES.P2WPKH)
|
|
throw new Error('P2WSH(P2WPKH) is a consensus failure');
|
|
|
|
return {
|
|
witnessScript,
|
|
witnessScriptType: expanded.type,
|
|
|
|
prevOutType: SCRIPT_TYPES.P2WSH,
|
|
prevOutScript: p2wsh.output,
|
|
|
|
hasWitness: true,
|
|
signScript,
|
|
signType: expanded.type,
|
|
|
|
pubkeys: expanded.pubkeys,
|
|
signatures: expanded.signatures,
|
|
maxSignatures: expanded.maxSignatures,
|
|
};
|
|
}
|
|
|
|
if (input.prevOutType && input.prevOutScript) {
|
|
// embedded scripts are not possible without extra information
|
|
if (input.prevOutType === SCRIPT_TYPES.P2SH)
|
|
throw new Error(
|
|
'PrevOutScript is ' + input.prevOutType + ', requires redeemScript',
|
|
);
|
|
if (input.prevOutType === SCRIPT_TYPES.P2WSH)
|
|
throw new Error(
|
|
'PrevOutScript is ' + input.prevOutType + ', requires witnessScript',
|
|
);
|
|
if (!input.prevOutScript) throw new Error('PrevOutScript is missing');
|
|
|
|
const expanded = expandOutput(input.prevOutScript, ourPubKey);
|
|
if (!expanded.pubkeys)
|
|
throw new Error(
|
|
expanded.type +
|
|
' not supported (' +
|
|
bscript.toASM(input.prevOutScript) +
|
|
')',
|
|
);
|
|
if (input.signatures && input.signatures.some(x => x !== undefined)) {
|
|
expanded.signatures = input.signatures;
|
|
}
|
|
|
|
let signScript = input.prevOutScript;
|
|
if (expanded.type === SCRIPT_TYPES.P2WPKH) {
|
|
signScript = payments.p2pkh({ pubkey: expanded.pubkeys[0] })
|
|
.output as Buffer;
|
|
}
|
|
|
|
return {
|
|
prevOutType: expanded.type,
|
|
prevOutScript: input.prevOutScript,
|
|
|
|
hasWitness: expanded.type === SCRIPT_TYPES.P2WPKH,
|
|
signScript,
|
|
signType: expanded.type,
|
|
|
|
pubkeys: expanded.pubkeys,
|
|
signatures: expanded.signatures,
|
|
maxSignatures: expanded.maxSignatures,
|
|
};
|
|
}
|
|
|
|
const prevOutScript = payments.p2pkh({ pubkey: ourPubKey }).output;
|
|
return {
|
|
prevOutType: SCRIPT_TYPES.P2PKH,
|
|
prevOutScript,
|
|
|
|
hasWitness: false,
|
|
signScript: prevOutScript,
|
|
signType: SCRIPT_TYPES.P2PKH,
|
|
|
|
pubkeys: [ourPubKey],
|
|
signatures: [undefined],
|
|
};
|
|
}
|
|
|
|
function build(
|
|
type: string,
|
|
input: TxbInput,
|
|
allowIncomplete?: boolean,
|
|
): Payment | undefined {
|
|
const pubkeys = (input.pubkeys || []) as Buffer[];
|
|
let signatures = (input.signatures || []) as Buffer[];
|
|
|
|
switch (type) {
|
|
case SCRIPT_TYPES.P2PKH: {
|
|
if (pubkeys.length === 0) break;
|
|
if (signatures.length === 0) break;
|
|
|
|
return payments.p2pkh({ pubkey: pubkeys[0], signature: signatures[0] });
|
|
}
|
|
case SCRIPT_TYPES.P2WPKH: {
|
|
if (pubkeys.length === 0) break;
|
|
if (signatures.length === 0) break;
|
|
|
|
return payments.p2wpkh({ pubkey: pubkeys[0], signature: signatures[0] });
|
|
}
|
|
case SCRIPT_TYPES.P2PK: {
|
|
if (pubkeys.length === 0) break;
|
|
if (signatures.length === 0) break;
|
|
|
|
return payments.p2pk({ signature: signatures[0] });
|
|
}
|
|
case SCRIPT_TYPES.P2MS: {
|
|
const m = input.maxSignatures;
|
|
if (allowIncomplete) {
|
|
signatures = signatures.map(x => x || ops.OP_0);
|
|
} else {
|
|
signatures = signatures.filter(x => x);
|
|
}
|
|
|
|
// if the transaction is not not complete (complete), or if signatures.length === m, validate
|
|
// otherwise, the number of OP_0's may be >= m, so don't validate (boo)
|
|
const validate = !allowIncomplete || m === signatures.length;
|
|
return payments.p2ms(
|
|
{ m, pubkeys, signatures },
|
|
{ allowIncomplete, validate },
|
|
);
|
|
}
|
|
case SCRIPT_TYPES.P2SH: {
|
|
const redeem = build(input.redeemScriptType!, input, allowIncomplete);
|
|
if (!redeem) return;
|
|
|
|
return payments.p2sh({
|
|
redeem: {
|
|
output: redeem.output || input.redeemScript,
|
|
input: redeem.input,
|
|
witness: redeem.witness,
|
|
},
|
|
});
|
|
}
|
|
case SCRIPT_TYPES.P2WSH: {
|
|
const redeem = build(input.witnessScriptType!, input, allowIncomplete);
|
|
if (!redeem) return;
|
|
|
|
return payments.p2wsh({
|
|
redeem: {
|
|
output: input.witnessScript,
|
|
input: redeem.input,
|
|
witness: redeem.witness,
|
|
},
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
function canSign(input: TxbInput): boolean {
|
|
return (
|
|
input.signScript !== undefined &&
|
|
input.signType !== undefined &&
|
|
input.pubkeys !== undefined &&
|
|
input.signatures !== undefined &&
|
|
input.signatures.length === input.pubkeys.length &&
|
|
input.pubkeys.length > 0 &&
|
|
(input.hasWitness === false || input.value !== undefined)
|
|
);
|
|
}
|
|
|
|
function signatureHashType(buffer: Buffer): number {
|
|
return buffer.readUInt8(buffer.length - 1);
|
|
}
|