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