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Script: detect and parse P2SH and multisig scripts

This commit is contained in:
Jeff Garzik 2013-08-16 16:38:28 -04:00
parent 04e147e490
commit 82a69d41e7
1 changed files with 108 additions and 21 deletions
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129
Script.js
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@ -15,6 +15,20 @@ function spec(b) {
var Parser = b.Parser || require('./util/BinaryParser').class();
var Put = b.Put || require('bufferput');
var TX_UNKNOWN = 0;
var TX_PUBKEY = 1;
var TX_PUBKEYHASH = 2;
var TX_MULTISIG = 3;
var TX_SCRIPTHASH = 4;
var TX_TYPES = {
TX_UNKNOWN: 'unknown',
TX_PUBKEY: 'pubkey',
TX_PUBKEYHASH: 'pubkeyhash',
TX_MULTISIG: 'multisig',
TX_SCRIPTHASH: 'scripthash',
};
function Script(buffer) {
if(buffer) {
this.buffer = buffer;
@ -52,32 +66,105 @@ function spec(b) {
}
};
Script.prototype.isSentToIP = function ()
Script.prototype.isP2SH = function ()
{
if (this.chunks.length != 2) {
return false;
}
return this.chunks[1] == OP_CHECKSIG && Buffer.isBuffer(this.chunks[0]);
return (this.chunks.length == 3 &&
this.chunks[0] == OP_HASH160 &&
Buffer.isBuffer(this.chunks[1]) &&
this.chunks[1].length == 20 &&
this.chunks[2] == OP_EQUAL);
};
Script.prototype.isPubkey = function ()
{
return (this.chunks.length == 2 &&
Buffer.isBuffer(this.chunks[0]) &&
this.chunks[1] == OP_CHECKSIG);
};
Script.prototype.isPubkeyHash = function ()
{
return (this.chunks.length == 5 &&
this.chunks[0] == OP_DUP &&
this.chunks[1] == OP_HASH160 &&
Buffer.isBuffer(this.chunks[2]) &&
this.chunks[2].length == 20 &&
this.chunks[3] == OP_EQUALVERIFY &&
this.chunks[4] == OP_CHECKSIG);
};
function isSmallIntOp(opcode)
{
return ((opcode == OP_0) ||
((opcode >= OP_1) && (opcode <= OP_16)));
};
Script.prototype.isMultiSig = function ()
{
return (this.chunks.length > 3 &&
isSmallIntOp(this.chunks[0]) &&
isSmallIntOp(this.chunks[-2]) &&
this.chunks[-1] == OP_CHECKMULTISIG);
};
// is this a script form we know?
Script.prototype.classify = function ()
{
if (this.isPubkeyHash())
return TX_PUBKEYHASH;
if (this.isP2SH())
return TX_SCRIPTHASH;
if (this.isMultiSig())
return TX_MULTISIG;
if (this.isPubkey())
return TX_PUBKEY;
return TX_UNKNOWN;
};
// extract useful data items from known scripts
Script.prototype.capture = function ()
{
var txType = this.classify();
var res = [];
switch (txType) {
case TX_PUBKEY:
res.push(this.chunks[0]);
break;
case TX_PUBKEYHASH:
res.push(this.chunks[2]);
break;
case TX_MULTISIG:
for (var i = 1; i < (this.chunks.length - 2); i++)
res.push(this.chunks[i]);
break;
case TX_SCRIPTHASH:
res.push(this.chunks[1]);
break;
case TX_UNKNOWN:
default:
// do nothing
break;
}
return res;
};
// return first extracted data item from script
Script.prototype.captureOne = function ()
{
var arr = this.capture();
return arr[0];
};
Script.prototype.getOutType = function ()
{
if (this.chunks.length == 5 &&
this.chunks[0] == OP_DUP &&
this.chunks[1] == OP_HASH160 &&
this.chunks[3] == OP_EQUALVERIFY &&
this.chunks[4] == OP_CHECKSIG) {
// Transfer to Bitcoin address
return 'Address';
} else if (this.chunks.length == 2 &&
this.chunks[1] == OP_CHECKSIG) {
// Transfer to IP address
return 'Pubkey';
} else {
return 'Strange';
}
var txType = this.classify();
switch (txType) {
case TX_PUBKEY: return 'Pubkey';
case TX_PUBKEYHASH: return 'Address';
default: return 'Strange';
}
};
Script.prototype.simpleOutHash = function ()