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clean up comments & extract methods

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[follow-up #125]
This commit is contained in:
Wei Lu 2014-04-14 12:53:12 +08:00
parent c3d95010ae
commit 4b86b1c7b8
1 changed files with 59 additions and 63 deletions
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122
src/script.js
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@ -104,72 +104,74 @@ Script.prototype.parse = function() {
* templates and return a string naming the detected type.
*
* Currently supported are:
* Pubkeyhash
* Pubkeyhash (address)
* Paying to a Bitcoin address which is the hash of a pubkey.
* OP_DUP OP_HASH160 [pubKeyHash] OP_EQUALVERIFY OP_CHECKSIG
* Example:
*
* Pubkey:
* Pubkey
* Paying to a public key directly.
* [pubKey] OP_CHECKSIG
* Example: txid 0e3e2357e806b6cdb1f70b54c3a3a17b6714ee1f0e68bebb44a74b1efd512098
*
* Scripthash (P2SH)
* Paying to an address which is the hash of a script
* OP_HASH160 [Scripthash] OP_EQUAL
* Example:
*
* Multisig
* Paying to multiple pubkeys and require a number of the signatures
* m [pubkey] [pubkey] [pubkey] n OP_CHECKMULTISIG
* Example:
*
* Strange:
* Nulldata
* Provably prune-able outputs
* OP_RETURN [data]
*
* Nonstandard:
* Any other script (no template matched).
*
* https://github.com/bitcoin/bitcoin/blob/19e5b9d2dfcac4efadba636745485d9660fb1abe/src/script.cpp#L75
*/
// Below is the current standard set of out types
/* const char* GetTxnOutputType(txnouttype t)
{
switch (t)
{
case TX_NONSTANDARD: return "nonstandard";
case TX_PUBKEY: return "pubkey";
case TX_PUBKEYHASH: return "pubkeyhash";
case TX_SCRIPTHASH: return "scripthash";
case TX_MULTISIG: return "multisig";
case TX_NULL_DATA: return "nulldata";
}
return NULL;
}*/
// https://github.com/bitcoin/bitcoin/blob/19e5b9d2dfcac4efadba636745485d9660fb1abe/src/script.cpp#L75
// supporting tx_null_data https://github.com/bitcoin/bitcoin/pull/3128
// https://helloblock.io/mainnet/transactions/ebc9fa1196a59e192352d76c0f6e73167046b9d37b8302b6bb6968dfd279b767
Script.prototype.getOutType = function() {
if (this.chunks.length == 5 &&
if (isPubkeyhash.call(this)) {
return 'pubkeyhash'
} else if (isPubkey.call(this)) {
return 'pubkey'
} else if (isScripthash.call(this)) {
return 'scripthash'
} else if (isMultisig.call(this)) {
return 'multisig'
} else if (isNulldata.call(this)) {
return 'nulldata'
} else {
return 'nonstandard'
}
}
function isPubkeyhash() {
return this.chunks.length == 5 &&
this.chunks[0] == Opcode.map.OP_DUP &&
this.chunks[1] == Opcode.map.OP_HASH160 &&
Array.isArray(this.chunks[2]) &&
this.chunks[2].length === 20 &&
this.chunks[3] == Opcode.map.OP_EQUALVERIFY &&
this.chunks[4] == Opcode.map.OP_CHECKSIG) {
// Transfer to Bitcoin address
return 'pubkeyhash';
} else if (this.chunks.length === 2 &&
this.chunks[4] == Opcode.map.OP_CHECKSIG
}
function isPubkey() {
return this.chunks.length === 2 &&
Array.isArray(this.chunks[0]) &&
this.chunks[1] === Opcode.map.OP_CHECKSIG) {
// [pubkey] OP_CHECKSIG
return 'pubkey';
} else if (this.chunks[this.chunks.length - 1] == Opcode.map.OP_EQUAL &&
this.chunks[1] === Opcode.map.OP_CHECKSIG
}
function isScripthash() {
return this.chunks[this.chunks.length - 1] == Opcode.map.OP_EQUAL &&
this.chunks[0] == Opcode.map.OP_HASH160 &&
Array.isArray(this.chunks[1]) &&
this.chunks[1].length === 20 &&
this.chunks.length == 3) {
// Transfer to M-OF-N
return 'scripthash';
} else if (this.chunks.length > 3 &&
this.chunks.length == 3
}
function isMultisig() {
return this.chunks.length > 3 &&
// m is a smallint
isSmallIntOp(this.chunks[0]) &&
// n is a smallint
@ -181,32 +183,28 @@ Script.prototype.getOutType = function() {
// n is the size of chunk length minus 3 (m, n, OP_CHECKMULTISIG)
this.chunks.length - 3 === this.chunks[this.chunks.length - 2] - Opcode.map.OP_RESERVED &&
// last chunk is OP_CHECKMULTISIG
this.chunks[this.chunks.length - 1] == Opcode.map.OP_CHECKMULTISIG) {
return 'multisig'
} else if (this.chunks[0] === Opcode.map.OP_RETURN) {
return 'nulldata'
} else {
return 'nonstandard';
}
this.chunks[this.chunks.length - 1] == Opcode.map.OP_CHECKMULTISIG
}
function isNulldata() {
return this.chunks[0] === Opcode.map.OP_RETURN
}
function isSmallIntOp(opcode) {
return ((opcode == Opcode.map.OP_0) ||
((opcode >= Opcode.map.OP_1) && (opcode <= Opcode.map.OP_16)));
};
((opcode >= Opcode.map.OP_1) && (opcode <= Opcode.map.OP_16)))
}
/**
* Returns the address corresponding to this output in hash160 form.
* Assumes strange scripts are P2SH
*/
Script.prototype.toScriptHash = function() {
var outType = this.getOutType()
if (outType == 'pubkeyhash') {
if(isPubkeyhash.call(this)) {
return this.chunks[2]
}
if (outType == 'scripthash') {
if(isScripthash.call(this)) {
return crypto.hash160(this.buffer)
}
@ -215,13 +213,11 @@ Script.prototype.toScriptHash = function() {
//TODO: support testnet
Script.prototype.getToAddress = function() {
var outType = this.getOutType()
if (outType == 'pubkeyhash') {
if(isPubkeyhash.call(this)) {
return new Address(this.chunks[2])
}
if (outType == 'scripthash') {
if(isScripthash.call(this)) {
return new Address(this.chunks[1], 5)
}
@ -255,7 +251,7 @@ Script.prototype.getFromAddress = function(){
* Multisig:
* Paying to M-of-N public keys.
*
* Strange:
* Nonstandard:
* Any other script (no template matched).
*/
Script.prototype.getInType = function() {
@ -263,20 +259,20 @@ Script.prototype.getInType = function() {
Array.isArray(this.chunks[0])) {
// Direct IP to IP transactions only have the signature in their scriptSig.
// TODO: We could also check that the length of the data is correct.
return 'pubkey';
return 'pubkey'
} else if (this.chunks.length == 2 &&
Array.isArray(this.chunks[0]) &&
Array.isArray(this.chunks[1])) {
return 'pubkeyhash';
return 'pubkeyhash'
} else if (this.chunks[0] == Opcode.map.OP_0 &&
this.chunks.slice(1).reduce(function(t, chunk, i) {
return t && Array.isArray(chunk) && (chunk[0] == 48 || i == this.chunks.length - 1);
return t && Array.isArray(chunk) && (chunk[0] == 48 || i == this.chunks.length - 1)
}, true)) {
return 'multisig';
return 'multisig'
} else {
return 'nonstandard';
return 'nonstandard'
}
};
}
/**
* Returns the affected public key for this input.