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TxBuilder: defer mutation as long as possible

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This commit is contained in:
Daniel Cousens 2015-02-04 20:02:10 +11:00
parent 085b813958
commit 8a8f40e903
1 changed files with 13 additions and 18 deletions
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31
src/transaction_builder.js
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@ -314,17 +314,15 @@ TransactionBuilder.prototype.sign = function(index, privKey, redeemScript, hashT
var scriptHash = input.prevOutScript.chunks[1]
assert.deepEqual(scriptHash, redeemScript.getHash(), 'RedeemScript does not match ' + scriptHash.toString('hex'))
} else {
input.prevOutScript = scripts.scriptHashOutput(redeemScript.getHash())
input.prevOutType = 'scripthash'
}
var scriptType = scripts.classifyOutput(redeemScript)
assert(scriptType in canSignTypes, 'RedeemScript not supported (' + scriptType + ')')
var pubKeys = []
switch (scriptType) {
case 'multisig':
input.pubKeys = redeemScript.chunks.slice(1, -2).map(ECPubKey.fromBuffer)
pubKeys = redeemScript.chunks.slice(1, -2).map(ECPubKey.fromBuffer)
break
case 'pubkeyhash':
@ -332,17 +330,20 @@ TransactionBuilder.prototype.sign = function(index, privKey, redeemScript, hashT
var pkh2 = privKey.pub.getAddress().hash
assert.deepEqual(pkh1, pkh2, 'privateKey cannot sign for this input')
input.pubKeys = [privKey.pub]
pubKeys = [privKey.pub]
break
case 'pubkey':
input.pubKeys = redeemScript.chunks.slice(0, 1).map(ECPubKey.fromBuffer)
pubKeys = redeemScript.chunks.slice(0, 1).map(ECPubKey.fromBuffer)
break
default:
assert(false, 'RedeemScript not supported (' + scriptType + ')')
}
if (!input.prevOutScript) {
input.prevOutScript = scripts.scriptHashOutput(redeemScript.getHash())
input.prevOutType = 'scripthash'
}
input.pubKeys = pubKeys
input.redeemScript = redeemScript
input.scriptType = scriptType
@ -365,14 +366,8 @@ TransactionBuilder.prototype.sign = function(index, privKey, redeemScript, hashT
// do we know how to sign this?
assert(input.scriptType in canSignTypes, input.scriptType + ' not supported')
var signatureHash
if (input.redeemScript) {
signatureHash = this.tx.hashForSignature(index, input.redeemScript, hashType)
} else {
signatureHash = this.tx.hashForSignature(index, input.prevOutScript, hashType)
}
var signatureScript = input.redeemScript || input.prevOutScript
var signatureHash = this.tx.hashForSignature(index, signatureScript, hashType)
var signature = privKey.sign(signatureHash)
// enforce signing in order of public keys