Script: move all templates to templates.js
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Daniel Cousens
parent
aded938ab6
commit
00cec9ce64
9 changed files with 331 additions and 366 deletions
src
228
src/script.js
228
src/script.js
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@ -110,232 +110,4 @@ Script.prototype.toHex = function() {
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return this.toBuffer().toString('hex')
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}
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/**
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* Compare the script to known templates of scriptPubKey.
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*
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* This method will compare the script to a small number of standard script
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* templates and return a string naming the detected type.
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*
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* Currently supported are:
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* Pubkeyhash (address)
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* Paying to a Bitcoin address which is the hash of a pubkey.
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* OP_DUP OP_HASH160 [pubKeyHash] OP_EQUALVERIFY OP_CHECKSIG
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*
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* Pubkey
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* Paying to a public key directly.
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* [pubKey] OP_CHECKSIG
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*
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* Scripthash (P2SH)
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* Paying to an address which is the hash of a script
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* OP_HASH160 [Scripthash] OP_EQUAL
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*
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* Multisig
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* Paying to multiple pubkeys and require a number of the signatures
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* m [pubkey] [pubkey] [pubkey] n OP_CHECKMULTISIG
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*
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* Nulldata
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* Provably prune-able outputs
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* OP_RETURN [data]
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*
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* Nonstandard:
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* Any other script (no template matched).
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*
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* https://github.com/bitcoin/bitcoin/blob/19e5b9d2dfcac4efadba636745485d9660fb1abe/src/script.cpp#L75
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*/
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Script.prototype.getOutType = function() {
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if (isPubkeyhash.call(this)) {
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return 'pubkeyhash'
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} else if (isPubkey.call(this)) {
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return 'pubkey'
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} else if (isScripthash.call(this)) {
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return 'scripthash'
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} else if (isMultisig.call(this)) {
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return 'multisig'
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} else if (isNulldata.call(this)) {
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return 'nulldata'
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} else {
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return 'nonstandard'
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}
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}
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function isPubkeyhash() {
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return this.chunks.length == 5 &&
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this.chunks[0] == opcodes.OP_DUP &&
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this.chunks[1] == opcodes.OP_HASH160 &&
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Buffer.isBuffer(this.chunks[2]) &&
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this.chunks[2].length === 20 &&
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this.chunks[3] == opcodes.OP_EQUALVERIFY &&
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this.chunks[4] == opcodes.OP_CHECKSIG
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}
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function isPubkey() {
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return this.chunks.length === 2 &&
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Buffer.isBuffer(this.chunks[0]) &&
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this.chunks[1] === opcodes.OP_CHECKSIG
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}
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function isScripthash() {
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return this.chunks[this.chunks.length - 1] == opcodes.OP_EQUAL &&
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this.chunks[0] == opcodes.OP_HASH160 &&
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Buffer.isBuffer(this.chunks[1]) &&
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this.chunks[1].length === 20 &&
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this.chunks.length == 3
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}
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function isMultisig() {
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return this.chunks.length > 3 &&
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// m is a smallint
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isSmallIntOp(this.chunks[0]) &&
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// n is a smallint
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isSmallIntOp(this.chunks[this.chunks.length - 2]) &&
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// n greater or equal to m
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this.chunks[0] <= this.chunks[this.chunks.length - 2] &&
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// n cannot be 0
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this.chunks[this.chunks.length - 2] !== opcodes.OP_0 &&
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// n is the size of chunk length minus 3 (m, n, OP_CHECKMULTISIG)
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this.chunks.length - 3 === this.chunks[this.chunks.length - 2] - opcodes.OP_RESERVED &&
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// last chunk is OP_CHECKMULTISIG
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this.chunks[this.chunks.length - 1] == opcodes.OP_CHECKMULTISIG
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}
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function isNulldata() {
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return this.chunks[0] === opcodes.OP_RETURN
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}
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function isSmallIntOp(opcode) {
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return ((opcode == opcodes.OP_0) ||
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((opcode >= opcodes.OP_1) && (opcode <= opcodes.OP_16)))
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}
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/**
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* Compare the script to known templates of scriptSig.
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*
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* This method will compare the script to a small number of standard script
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* templates and return a string naming the detected type.
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*
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* WARNING: Use this method with caution. It merely represents a heuristic
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* based on common transaction formats. A non-standard transaction could
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* very easily match one of these templates by accident.
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*
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* Currently supported are:
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* Address:
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* Paying to a Bitcoin address which is the hash of a pubkey.
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* [sig] [pubKey]
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*
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* Pubkey:
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* Paying to a public key directly.
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* [sig]
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*
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* Multisig:
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* Paying to M-of-N public keys.
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*
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* Nonstandard:
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* Any other script (no template matched).
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*/
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Script.prototype.getInType = function() {
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if (this.chunks.length == 1 &&
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Buffer.isBuffer(this.chunks[0])) {
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// Direct IP to IP transactions only have the signature in their scriptSig.
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// TODO: We could also check that the length of the data is correct.
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return 'pubkey'
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} else if (this.chunks.length == 2 &&
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Buffer.isBuffer(this.chunks[0]) &&
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Buffer.isBuffer(this.chunks[1])) {
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return 'pubkeyhash'
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} else if (this.chunks[0] == opcodes.OP_0 &&
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this.chunks.slice(1).reduce(function(t, chunk, i) {
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return t && Buffer.isBuffer(chunk) && (chunk[0] == 48 || i == this.chunks.length - 1)
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}, true)) {
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return 'multisig'
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} else {
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return 'nonstandard'
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}
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}
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// {pubKey} OP_CHECKSIG
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Script.createPubKeyScriptPubKey = function(pubKey) {
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return Script.fromChunks([
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pubKey.toBuffer(),
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opcodes.OP_CHECKSIG
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])
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}
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// OP_DUP OP_HASH160 {pubKeyHash} OP_EQUALVERIFY OP_CHECKSIG
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Script.createPubKeyHashScriptPubKey = function(hash) {
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assert(Buffer.isBuffer(hash), 'Expected Buffer, got ' + hash)
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return Script.fromChunks([
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opcodes.OP_DUP,
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opcodes.OP_HASH160,
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hash,
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opcodes.OP_EQUALVERIFY,
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opcodes.OP_CHECKSIG
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])
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}
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// OP_HASH160 {scriptHash} OP_EQUAL
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Script.createP2SHScriptPubKey = function(hash) {
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assert(Buffer.isBuffer(hash), 'Expected Buffer, got ' + hash)
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return Script.fromChunks([
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opcodes.OP_HASH160,
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hash,
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opcodes.OP_EQUAL
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])
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}
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// m [pubKeys ...] n OP_CHECKMULTISIG
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Script.createMultisigScriptPubKey = function(m, pubKeys) {
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assert(Array.isArray(pubKeys), 'Expected Array, got ' + pubKeys)
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assert(pubKeys.length >= m, 'Not enough pubKeys provided')
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var pubKeyBuffers = pubKeys.map(function(pubKey) {
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return pubKey.toBuffer()
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})
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var n = pubKeys.length
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return Script.fromChunks([].concat(
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(opcodes.OP_1 - 1) + m,
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pubKeyBuffers,
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(opcodes.OP_1 - 1) + n,
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opcodes.OP_CHECKMULTISIG
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))
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}
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// {signature}
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Script.createPubKeyScriptSig = function(signature) {
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assert(Buffer.isBuffer(signature), 'Expected Buffer, got ' + signature)
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return Script.fromChunks(signature)
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}
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// {signature} {pubKey}
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Script.createPubKeyHashScriptSig = function(signature, pubKey) {
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assert(Buffer.isBuffer(signature), 'Expected Buffer, got ' + signature)
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return Script.fromChunks([signature, pubKey.toBuffer()])
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}
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// <scriptSig> {serialized scriptPubKey script}
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Script.createP2SHScriptSig = function(scriptSig, scriptPubKey) {
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return Script.fromChunks([].concat(
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scriptSig.chunks,
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scriptPubKey.toBuffer()
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))
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}
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// OP_0 [signatures ...]
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Script.createMultisigScriptSig = function(signatures, scriptPubKey) {
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if (scriptPubKey) {
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assert(isMultisig.call(scriptPubKey))
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var m = scriptPubKey.chunks[0]
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var k = m - (opcodes.OP_1 - 1)
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assert(k <= signatures.length, 'Not enough signatures provided')
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}
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return Script.fromChunks([].concat(opcodes.OP_0, signatures))
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}
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module.exports = Script
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