777 lines
23 KiB
JavaScript
777 lines
23 KiB
JavaScript
const Buffer = require('safe-buffer').Buffer
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const baddress = require('./address')
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const bcrypto = require('./crypto')
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const bscript = require('./script')
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const networks = require('./networks')
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const ops = require('bitcoin-ops')
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const payments = require('./payments')
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const typeforce = require('typeforce')
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const types = require('./types')
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const classify = require('./classify')
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const SCRIPT_TYPES = classify.types
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const ECPair = require('./ecpair')
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const Transaction = require('./transaction')
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function expandInput (scriptSig, witnessStack, type, scriptPubKey) {
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if (scriptSig.length === 0 && witnessStack.length === 0) return {}
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if (!type) {
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let ssType = classify.input(scriptSig, true)
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let wsType = 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({ witness: witnessStack })
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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({ input: scriptSig })
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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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input: scriptSig,
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output: scriptPubKey
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}, { allowIncomplete: true })
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return {
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prevOutType: SCRIPT_TYPES.P2MS,
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pubkeys: pubkeys,
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signatures: 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(redeem.input, redeem.witness, outputType, redeem.output)
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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
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if (outputType === SCRIPT_TYPES.P2WPKH) {
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expanded = expandInput(redeem.input, redeem.witness, outputType)
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} else {
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expanded = expandInput(bscript.compile(redeem.witness), [], outputType, 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.P2WSH,
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witnessScript: redeem.output,
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witnessScriptType: expanded.prevOutType,
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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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return {
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prevOutType: SCRIPT_TYPES.NONSTANDARD,
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prevOutScript: scriptSig
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}
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}
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// could be done in expandInput, but requires the original Transaction for hashForSignature
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function fixMultisigOrder (input, transaction, vin) {
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if (input.redeemScriptType !== SCRIPT_TYPES.P2MS || !input.redeemScript) return
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if (input.pubkeys.length === input.signatures.length) return
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const unmatched = input.signatures.concat()
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input.signatures = input.pubkeys.map(function (pubKey) {
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const keyPair = ECPair.fromPublicKey(pubKey)
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let match
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// check for a signature
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unmatched.some(function (signature, i) {
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// skip if undefined || OP_0
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if (!signature) return false
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// TODO: avoid O(n) hashForSignature
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const parsed = bscript.signature.decode(signature)
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const hash = transaction.hashForSignature(vin, input.redeemScript, parsed.hashType)
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// skip if signature does not match pubKey
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if (!keyPair.verify(hash, parsed.signature)) return false
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// remove matched signature from unmatched
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unmatched[i] = undefined
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match = signature
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return true
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})
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return match
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})
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}
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function expandOutput (script, ourPubKey) {
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typeforce(types.Buffer, script)
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const type = classify.output(script)
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switch (type) {
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case SCRIPT_TYPES.P2PKH: {
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if (!ourPubKey) return { type }
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// does our hash160(pubKey) match the output scripts?
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const pkh1 = payments.p2pkh({ output: script }).hash
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const pkh2 = bcrypto.hash160(ourPubKey)
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if (!pkh1.equals(pkh2)) return { type }
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return {
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type,
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pubkeys: [ourPubKey],
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signatures: [undefined]
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}
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}
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case SCRIPT_TYPES.P2WPKH: {
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if (!ourPubKey) return { type }
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// does our hash160(pubKey) match the output scripts?
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const wpkh1 = payments.p2wpkh({ output: script }).hash
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const wpkh2 = bcrypto.hash160(ourPubKey)
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if (!wpkh1.equals(wpkh2)) return { type }
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return {
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type,
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pubkeys: [ourPubKey],
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signatures: [undefined]
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}
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}
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case SCRIPT_TYPES.P2PK: {
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const p2pk = payments.p2pk({ output: script })
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return {
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type,
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pubkeys: [p2pk.pubkey],
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signatures: [undefined]
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}
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}
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case SCRIPT_TYPES.P2MS: {
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const p2ms = payments.p2ms({ output: script })
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return {
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type,
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pubkeys: p2ms.pubkeys,
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signatures: p2ms.pubkeys.map(() => undefined),
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maxSignatures: p2ms.m
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}
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}
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}
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return { type }
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}
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function prepareInput (input, ourPubKey, redeemScript, witnessValue, witnessScript) {
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if (redeemScript && witnessScript) {
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const p2wsh = payments.p2wsh({ redeem: { output: witnessScript } })
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const p2wshAlt = payments.p2wsh({ output: redeemScript })
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const p2sh = payments.p2sh({ redeem: { output: redeemScript } })
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const p2shAlt = payments.p2sh({ redeem: p2wsh })
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// enforces P2SH(P2WSH(...))
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if (!p2wsh.hash.equals(p2wshAlt.hash)) throw new Error('Witness script inconsistent with prevOutScript')
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if (!p2sh.hash.equals(p2shAlt.hash)) throw new Error('Redeem script inconsistent with prevOutScript')
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const expanded = expandOutput(p2wsh.redeem.output, ourPubKey)
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if (!expanded.pubkeys) throw new Error(expanded.type + ' not supported as witnessScript (' + bscript.toASM(witnessScript) + ')')
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if (input.signatures && input.signatures.some(x => x)) {
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expanded.signatures = input.signatures
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}
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let signScript = witnessScript
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if (expanded.type === SCRIPT_TYPES.P2WPKH) throw new Error('P2SH(P2WSH(P2WPKH)) is a consensus failure')
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return {
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redeemScript,
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redeemScriptType: SCRIPT_TYPES.P2WSH,
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witnessScript,
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witnessScriptType: expanded.type,
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prevOutType: SCRIPT_TYPES.P2SH,
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prevOutScript: p2sh.output,
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hasWitness: true,
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signScript,
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signType: expanded.type,
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pubkeys: expanded.pubkeys,
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signatures: expanded.signatures,
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maxSignatures: expanded.maxSignatures
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}
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}
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if (redeemScript) {
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const p2sh = payments.p2sh({ redeem: { output: redeemScript } })
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if (input.prevOutScript) {
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let p2shAlt
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try {
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p2shAlt = payments.p2sh({ output: input.prevOutScript })
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} catch (e) { throw new Error('PrevOutScript must be P2SH') }
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if (!p2sh.hash.equals(p2shAlt.hash)) throw new Error('Redeem script inconsistent with prevOutScript')
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}
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const expanded = expandOutput(p2sh.redeem.output, ourPubKey)
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if (!expanded.pubkeys) throw new Error(expanded.type + ' not supported as redeemScript (' + bscript.toASM(redeemScript) + ')')
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if (input.signatures && input.signatures.some(x => x)) {
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expanded.signatures = input.signatures
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}
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let signScript = redeemScript
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if (expanded.type === SCRIPT_TYPES.P2WPKH) {
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signScript = payments.p2pkh({ pubkey: expanded.pubkeys[0] }).output
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}
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return {
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redeemScript,
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redeemScriptType: expanded.type,
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prevOutType: SCRIPT_TYPES.P2SH,
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prevOutScript: p2sh.output,
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hasWitness: expanded.type === SCRIPT_TYPES.P2WPKH,
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signScript,
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signType: expanded.type,
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pubkeys: expanded.pubkeys,
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signatures: expanded.signatures,
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maxSignatures: expanded.maxSignatures
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}
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}
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if (witnessScript) {
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const p2wsh = payments.p2wsh({ redeem: { output: witnessScript } })
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if (input.prevOutScript) {
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const p2wshAlt = payments.p2wsh({ output: input.prevOutScript })
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if (!p2wsh.hash.equals(p2wshAlt.hash)) throw new Error('Witness script inconsistent with prevOutScript')
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}
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const expanded = expandOutput(p2wsh.redeem.output, ourPubKey)
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if (!expanded.pubkeys) throw new Error(expanded.type + ' not supported as witnessScript (' + bscript.toASM(witnessScript) + ')')
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if (input.signatures && input.signatures.some(x => x)) {
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expanded.signatures = input.signatures
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}
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let signScript = witnessScript
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if (expanded.type === SCRIPT_TYPES.P2WPKH) throw new Error('P2WSH(P2WPKH) is a consensus failure')
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return {
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witnessScript,
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witnessScriptType: expanded.type,
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prevOutType: SCRIPT_TYPES.P2WSH,
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prevOutScript: p2wsh.output,
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hasWitness: true,
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signScript,
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signType: expanded.type,
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pubkeys: expanded.pubkeys,
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signatures: expanded.signatures,
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maxSignatures: expanded.maxSignatures
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}
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}
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if (input.prevOutType && input.prevOutScript) {
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// embedded scripts are not possible without extra information
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if (input.prevOutType === SCRIPT_TYPES.P2SH) throw new Error('PrevOutScript is ' + input.prevOutType + ', requires redeemScript')
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if (input.prevOutType === SCRIPT_TYPES.P2WSH) throw new Error('PrevOutScript is ' + input.prevOutType + ', requires witnessScript')
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if (!input.prevOutScript) throw new Error('PrevOutScript is missing')
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const expanded = expandOutput(input.prevOutScript, ourPubKey)
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if (!expanded.pubkeys) throw new Error(expanded.type + ' not supported (' + bscript.toASM(input.prevOutScript) + ')')
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if (input.signatures && input.signatures.some(x => x)) {
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expanded.signatures = input.signatures
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}
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let signScript = input.prevOutScript
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if (expanded.type === SCRIPT_TYPES.P2WPKH) {
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signScript = payments.p2pkh({ pubkey: expanded.pubkeys[0] }).output
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}
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return {
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prevOutType: expanded.type,
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prevOutScript: input.prevOutScript,
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hasWitness: expanded.type === SCRIPT_TYPES.P2WPKH,
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signScript,
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signType: expanded.type,
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pubkeys: expanded.pubkeys,
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signatures: expanded.signatures,
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maxSignatures: expanded.maxSignatures
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}
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}
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const prevOutScript = payments.p2pkh({ pubkey: ourPubKey }).output
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return {
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prevOutType: SCRIPT_TYPES.P2PKH,
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prevOutScript: prevOutScript,
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hasWitness: false,
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signScript: prevOutScript,
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signType: SCRIPT_TYPES.P2PKH,
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pubkeys: [ourPubKey],
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signatures: [undefined]
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}
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}
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function build (type, input, allowIncomplete) {
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const pubkeys = input.pubkeys || []
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let signatures = input.signatures || []
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switch (type) {
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case SCRIPT_TYPES.P2PKH: {
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if (pubkeys.length === 0) break
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if (signatures.length === 0) break
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return payments.p2pkh({ pubkey: pubkeys[0], signature: signatures[0] })
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}
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case SCRIPT_TYPES.P2WPKH: {
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if (pubkeys.length === 0) break
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if (signatures.length === 0) break
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return payments.p2wpkh({ pubkey: pubkeys[0], signature: signatures[0] })
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}
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case SCRIPT_TYPES.P2PK: {
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if (pubkeys.length === 0) break
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if (signatures.length === 0) break
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return payments.p2pk({ signature: signatures[0] })
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}
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case SCRIPT_TYPES.P2MS: {
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const m = input.maxSignatures
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if (allowIncomplete) {
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signatures = signatures.map(x => x || ops.OP_0)
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} else {
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signatures = signatures.filter(x => x)
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}
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// if the transaction is not not complete (complete), or if signatures.length === m, validate
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// otherwise, the number of OP_0's may be >= m, so don't validate (boo)
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const validate = !allowIncomplete || (m === signatures.length)
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return payments.p2ms({ m, pubkeys, signatures }, { allowIncomplete, validate })
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}
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case SCRIPT_TYPES.P2SH: {
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const redeem = build(input.redeemScriptType, input, allowIncomplete)
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if (!redeem) return
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return payments.p2sh({
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redeem: {
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output: redeem.output || input.redeemScript,
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input: redeem.input,
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witness: redeem.witness
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}
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})
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}
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case SCRIPT_TYPES.P2WSH: {
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const redeem = build(input.witnessScriptType, input, allowIncomplete)
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if (!redeem) return
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return payments.p2wsh({
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redeem: {
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output: input.witnessScript,
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input: redeem.input,
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witness: redeem.witness
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}
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})
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}
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}
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}
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function TransactionBuilder (network, maximumFeeRate) {
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this.__prevTxSet = {}
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this.network = network || networks.bitcoin
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// WARNING: This is __NOT__ to be relied on, its just another potential safety mechanism (safety in-depth)
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this.maximumFeeRate = maximumFeeRate || 2500
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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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}
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TransactionBuilder.prototype.setLockTime = function (locktime) {
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typeforce(types.UInt32, locktime)
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// if any signatures exist, throw
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if (this.__inputs.some(function (input) {
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if (!input.signatures) return false
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return input.signatures.some(function (s) { return s })
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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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TransactionBuilder.prototype.setVersion = function (version) {
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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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TransactionBuilder.fromTransaction = function (transaction, network) {
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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(function (txOut) {
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txb.addOutput(txOut.script, txOut.value)
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})
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// Copy inputs
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transaction.ins.forEach(function (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(function (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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TransactionBuilder.prototype.addInput = function (txHash, vout, sequence, prevOutScript) {
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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
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// is it a hex string?
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if (typeof txHash === 'string') {
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// transaction hashs's are displayed in reverse order, un-reverse it
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txHash = Buffer.from(txHash, 'hex').reverse()
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// is it a Transaction object?
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} else if (txHash instanceof Transaction) {
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const txOut = txHash.outs[vout]
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prevOutScript = txOut.script
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value = txOut.value
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txHash = txHash.getHash()
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}
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return this.__addInputUnsafe(txHash, vout, {
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sequence: sequence,
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prevOutScript: prevOutScript,
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value: value
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})
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}
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TransactionBuilder.prototype.__addInputUnsafe = function (txHash, vout, options) {
|
|
if (Transaction.isCoinbaseHash(txHash)) {
|
|
throw new Error('coinbase inputs not supported')
|
|
}
|
|
|
|
const prevTxOut = txHash.toString('hex') + ':' + vout
|
|
if (this.__prevTxSet[prevTxOut] !== undefined) throw new Error('Duplicate TxOut: ' + prevTxOut)
|
|
|
|
let input = {}
|
|
|
|
// 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.__prevTxSet[prevTxOut] = true
|
|
return vin
|
|
}
|
|
|
|
TransactionBuilder.prototype.addOutput = function (scriptPubKey, value) {
|
|
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)
|
|
}
|
|
|
|
TransactionBuilder.prototype.build = function () {
|
|
return this.__build(false)
|
|
}
|
|
TransactionBuilder.prototype.buildIncomplete = function () {
|
|
return this.__build(true)
|
|
}
|
|
|
|
TransactionBuilder.prototype.__build = function (allowIncomplete) {
|
|
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(function (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
|
|
}
|
|
|
|
function canSign (input) {
|
|
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
|
|
)
|
|
}
|
|
|
|
TransactionBuilder.prototype.sign = function (vin, keyPair, redeemScript, hashType, witnessValue, witnessScript) {
|
|
// 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 didn\'t match witnessValue')
|
|
typeforce(types.Satoshi, witnessValue)
|
|
input.value = witnessValue
|
|
}
|
|
|
|
if (!canSign(input)) {
|
|
const prepared = prepareInput(input, ourPubKey, redeemScript, witnessValue, witnessScript)
|
|
|
|
// updates inline
|
|
Object.assign(input, prepared)
|
|
}
|
|
|
|
if (!canSign(input)) throw Error(input.prevOutType + ' not supported')
|
|
}
|
|
|
|
// ready to sign
|
|
let signatureHash
|
|
if (input.hasWitness) {
|
|
signatureHash = this.__tx.hashForWitnessV0(vin, input.signScript, input.value, hashType)
|
|
} else {
|
|
signatureHash = this.__tx.hashForSignature(vin, input.signScript, hashType)
|
|
}
|
|
|
|
// enforce in order signing of public keys
|
|
const signed = input.pubkeys.some(function (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')
|
|
}
|
|
|
|
function signatureHashType (buffer) {
|
|
return buffer.readUInt8(buffer.length - 1)
|
|
}
|
|
|
|
TransactionBuilder.prototype.__canModifyInputs = function () {
|
|
return this.__inputs.every(function (input) {
|
|
if (!input.signatures) return true
|
|
|
|
return input.signatures.every(function (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
|
|
})
|
|
})
|
|
}
|
|
|
|
TransactionBuilder.prototype.__needsOutputs = function (signingHashType) {
|
|
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
|
|
})
|
|
})
|
|
}
|
|
|
|
TransactionBuilder.prototype.__canModifyOutputs = function () {
|
|
const nInputs = this.__tx.ins.length
|
|
const nOutputs = this.__tx.outs.length
|
|
|
|
return this.__inputs.every(function (input) {
|
|
if (input.signatures === undefined) return true
|
|
|
|
return input.signatures.every(function (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
|
|
}
|
|
})
|
|
})
|
|
}
|
|
|
|
TransactionBuilder.prototype.__overMaximumFees = function (bytes) {
|
|
// not all inputs will have .value defined
|
|
const incoming = this.__inputs.reduce(function (a, x) { return 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(function (a, x) { return a + x.value }, 0)
|
|
const fee = incoming - outgoing
|
|
const feeRate = fee / bytes
|
|
|
|
return feeRate > this.maximumFeeRate
|
|
}
|
|
|
|
module.exports = TransactionBuilder
|