730 lines
20 KiB
JavaScript
730 lines
20 KiB
JavaScript
'use strict';
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var Address = require('./address');
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var BufferReader = require('./encoding/bufferreader');
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var BufferWriter = require('./encoding/bufferwriter');
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var Hash = require('./crypto/hash');
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var Opcode = require('./opcode');
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var PublicKey = require('./publickey');
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var Signature = require('./crypto/signature');
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var $ = require('./util/preconditions');
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var _ = require('lodash');
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var errors = require('./errors');
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var buffer = require('buffer');
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var BufferUtil = require('./util/buffer');
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var jsUtil = require('./util/js');
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/**
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* A bitcoin transaction script. Each transaction's inputs and outputs
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* has a script that is evaluated to validate it's spending.
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*
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* See https://en.bitcoin.it/wiki/Script
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*
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* @constructor
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* @param {Object|string|Buffer} [from] optional data to populate script
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*/
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var Script = function Script(from) {
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if (!(this instanceof Script)) {
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return new Script(from);
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}
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this.chunks = [];
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if (BufferUtil.isBuffer(from)) {
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return Script.fromBuffer(from);
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} else if (from instanceof Address) {
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return Script.fromAddress(from);
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} else if (from instanceof Script) {
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return Script.fromBuffer(from.toBuffer());
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} else if (typeof from === 'string') {
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return Script.fromString(from);
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} else if (typeof from !== 'undefined') {
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this.set(from);
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}
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};
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Script.prototype.set = function(obj) {
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this.chunks = obj.chunks || this.chunks;
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return this;
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};
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Script.fromBuffer = function(buffer) {
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var script = new Script();
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script.chunks = [];
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var br = new BufferReader(buffer);
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while (!br.eof()) {
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var opcodenum = br.readUInt8();
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var len, buf;
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if (opcodenum > 0 && opcodenum < Opcode.OP_PUSHDATA1) {
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len = opcodenum;
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script.chunks.push({
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buf: br.read(len),
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len: len,
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opcodenum: opcodenum
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});
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} else if (opcodenum === Opcode.OP_PUSHDATA1) {
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len = br.readUInt8();
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buf = br.read(len);
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script.chunks.push({
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buf: buf,
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len: len,
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opcodenum: opcodenum
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});
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} else if (opcodenum === Opcode.OP_PUSHDATA2) {
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len = br.readUInt16LE();
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buf = br.read(len);
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script.chunks.push({
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buf: buf,
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len: len,
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opcodenum: opcodenum
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});
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} else if (opcodenum === Opcode.OP_PUSHDATA4) {
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len = br.readUInt32LE();
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buf = br.read(len);
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script.chunks.push({
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buf: buf,
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len: len,
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opcodenum: opcodenum
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});
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} else {
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script.chunks.push({
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opcodenum: opcodenum
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});
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}
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}
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return script;
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};
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Script.prototype.toBuffer = function() {
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var bw = new BufferWriter();
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for (var i = 0; i < this.chunks.length; i++) {
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var chunk = this.chunks[i];
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var opcodenum = chunk.opcodenum;
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bw.writeUInt8(chunk.opcodenum);
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if (chunk.buf) {
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if (opcodenum < Opcode.OP_PUSHDATA1) {
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bw.write(chunk.buf);
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} else if (opcodenum === Opcode.OP_PUSHDATA1) {
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bw.writeUInt8(chunk.len);
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bw.write(chunk.buf);
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} else if (opcodenum === Opcode.OP_PUSHDATA2) {
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bw.writeUInt16LE(chunk.len);
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bw.write(chunk.buf);
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} else if (opcodenum === Opcode.OP_PUSHDATA4) {
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bw.writeUInt32LE(chunk.len);
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bw.write(chunk.buf);
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}
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}
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}
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return bw.concat();
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};
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Script.fromString = function(str) {
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if (jsUtil.isHexa(str) || str.length === 0) {
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return new Script(new buffer.Buffer(str, 'hex'));
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}
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var script = new Script();
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script.chunks = [];
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var tokens = str.split(' ');
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var i = 0;
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while (i < tokens.length) {
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var token = tokens[i];
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var opcode = Opcode(token);
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var opcodenum = opcode.toNumber();
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if (_.isUndefined(opcodenum)) {
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opcodenum = parseInt(token);
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if (opcodenum > 0 && opcodenum < Opcode.OP_PUSHDATA1) {
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script.chunks.push({
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buf: new Buffer(tokens[i + 1].slice(2), 'hex'),
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len: opcodenum,
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opcodenum: opcodenum
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});
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i = i + 2;
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} else {
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throw new Error('Invalid script: ' + JSON.stringify(str));
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}
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} else if (opcodenum === Opcode.OP_PUSHDATA1 ||
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opcodenum === Opcode.OP_PUSHDATA2 ||
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opcodenum === Opcode.OP_PUSHDATA4) {
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if (tokens[i + 2].slice(0, 2) !== '0x') {
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throw new Error('Pushdata data must start with 0x');
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}
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script.chunks.push({
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buf: new Buffer(tokens[i + 2].slice(2), 'hex'),
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len: parseInt(tokens[i + 1]),
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opcodenum: opcodenum
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});
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i = i + 3;
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} else {
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script.chunks.push({
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opcodenum: opcodenum
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});
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i = i + 1;
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}
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}
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return script;
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};
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Script.prototype.toString = function() {
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var str = '';
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for (var i = 0; i < this.chunks.length; i++) {
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var chunk = this.chunks[i];
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var opcodenum = chunk.opcodenum;
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if (!chunk.buf) {
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if (typeof Opcode.reverseMap[opcodenum] !== 'undefined') {
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str = str + ' ' + Opcode(opcodenum).toString();
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} else {
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var numstr = opcodenum.toString(16);
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if (numstr.length % 2 !== 0) {
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numstr = '0' + numstr;
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}
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str = str + ' ' + '0x' + numstr;
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}
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} else {
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if (opcodenum === Opcode.OP_PUSHDATA1 ||
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opcodenum === Opcode.OP_PUSHDATA2 ||
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opcodenum === Opcode.OP_PUSHDATA4) {
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str = str + ' ' + Opcode(opcodenum).toString();
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}
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str = str + ' ' + chunk.len;
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if (chunk.len > 0) {
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str = str + ' ' + '0x' + chunk.buf.toString('hex');
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}
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}
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}
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return str.substr(1);
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};
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Script.prototype.inspect = function() {
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return '<Script: ' + this.toString() + '>';
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};
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// script classification methods
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/**
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* @returns true if this is a pay to pubkey hash output script
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*/
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Script.prototype.isPublicKeyHashOut = function() {
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return !!(this.chunks.length === 5 &&
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this.chunks[0].opcodenum === Opcode.OP_DUP &&
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this.chunks[1].opcodenum === Opcode.OP_HASH160 &&
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this.chunks[2].buf &&
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this.chunks[3].opcodenum === Opcode.OP_EQUALVERIFY &&
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this.chunks[4].opcodenum === Opcode.OP_CHECKSIG);
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};
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/**
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* @returns true if this is a pay to public key hash input script
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*/
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Script.prototype.isPublicKeyHashIn = function() {
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return this.chunks.length === 2 &&
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this.chunks[0].buf &&
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this.chunks[0].buf.length >= 0x47 &&
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this.chunks[0].buf.length <= 0x49 &&
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PublicKey.isValid(this.chunks[1].buf);
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};
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Script.prototype.getPublicKeyHash = function() {
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$.checkState(this.isPublicKeyHashOut(), 'Can\'t retrieve PublicKeyHash from a non-PKH output');
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return this.chunks[2].buf;
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};
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/**
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* @returns true if this is a public key output script
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*/
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Script.prototype.isPublicKeyOut = function() {
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return this.chunks.length === 2 &&
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BufferUtil.isBuffer(this.chunks[0].buf) &&
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PublicKey.isValid(this.chunks[0].buf) &&
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this.chunks[1].opcodenum === Opcode.OP_CHECKSIG;
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};
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/**
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* @returns true if this is a pay to public key input script
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*/
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Script.prototype.isPublicKeyIn = function() {
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return this.chunks.length === 1 &&
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BufferUtil.isBuffer(this.chunks[0].buf) &&
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this.chunks[0].buf.length === 0x47;
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};
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/**
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* @returns true if this is a p2sh output script
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*/
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Script.prototype.isScriptHashOut = function() {
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var buf = this.toBuffer();
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return (buf.length === 23 &&
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buf[0] === Opcode.OP_HASH160 &&
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buf[1] === 0x14 &&
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buf[22] === Opcode.OP_EQUAL);
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};
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/**
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* @returns true if this is a p2sh input script
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* Note that these are frequently indistinguishable from pubkeyhashin
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*/
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Script.prototype.isScriptHashIn = function() {
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if (this.chunks.length === 0) {
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return false;
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}
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var chunk = this.chunks[this.chunks.length - 1];
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if (!chunk) {
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return false;
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}
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var scriptBuf = chunk.buf;
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if (!scriptBuf) {
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return false;
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}
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var redeemScript = new Script(scriptBuf);
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var type = redeemScript.classify();
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return type !== Script.types.UNKNOWN;
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};
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/**
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* @returns true if this is a mutlsig output script
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*/
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Script.prototype.isMultisigOut = function() {
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return (this.chunks.length > 3 &&
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Opcode.isSmallIntOp(this.chunks[0].opcodenum) &&
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this.chunks.slice(1, this.chunks.length - 2).every(function(obj) {
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return obj.buf && BufferUtil.isBuffer(obj.buf);
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}) &&
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Opcode.isSmallIntOp(this.chunks[this.chunks.length - 2].opcodenum) &&
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this.chunks[this.chunks.length - 1].opcodenum === Opcode.OP_CHECKMULTISIG);
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};
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/**
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* @returns true if this is a multisig input script
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*/
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Script.prototype.isMultisigIn = function() {
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return this.chunks.length >= 2 &&
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this.chunks[0].opcodenum === 0 &&
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this.chunks.slice(1, this.chunks.length).every(function(obj) {
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return obj.buf &&
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BufferUtil.isBuffer(obj.buf) &&
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obj.buf.length === 0x47;
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});
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};
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/**
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* @returns true if this is an OP_RETURN data script
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*/
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Script.prototype.isDataOut = function() {
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return this.chunks.length >= 1 &&
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this.chunks[0].opcodenum === Opcode.OP_RETURN &&
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(this.chunks.length === 1 ||
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(this.chunks.length === 2 &&
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this.chunks[1].buf &&
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this.chunks[1].buf.length <= 40 &&
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this.chunks[1].length === this.chunks.len));
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};
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/**
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* @returns true if the script is only composed of data pushing
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* opcodes or small int opcodes (OP_0, OP_1, ..., OP_16)
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*/
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Script.prototype.isPushOnly = function() {
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return _.every(this.chunks, function(chunk) {
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return chunk.opcodenum <= Opcode.OP_16;
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});
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};
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Script.types = {};
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Script.types.UNKNOWN = 'Unknown';
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Script.types.PUBKEY_OUT = 'Pay to public key';
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Script.types.PUBKEY_IN = 'Spend from public key';
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Script.types.PUBKEYHASH_OUT = 'Pay to public key hash';
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Script.types.PUBKEYHASH_IN = 'Spend from public key hash';
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Script.types.SCRIPTHASH_OUT = 'Pay to script hash';
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Script.types.SCRIPTHASH_IN = 'Spend from script hash';
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Script.types.MULTISIG_OUT = 'Pay to multisig';
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Script.types.MULTISIG_IN = 'Spend from multisig';
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Script.types.DATA_OUT = 'Data push';
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Script.identifiers = {};
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Script.identifiers.PUBKEY_OUT = Script.prototype.isPublicKeyOut;
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Script.identifiers.PUBKEY_IN = Script.prototype.isPublicKeyIn;
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Script.identifiers.PUBKEYHASH_OUT = Script.prototype.isPublicKeyHashOut;
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Script.identifiers.PUBKEYHASH_IN = Script.prototype.isPublicKeyHashIn;
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Script.identifiers.MULTISIG_OUT = Script.prototype.isMultisigOut;
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Script.identifiers.MULTISIG_IN = Script.prototype.isMultisigIn;
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Script.identifiers.SCRIPTHASH_OUT = Script.prototype.isScriptHashOut;
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Script.identifiers.SCRIPTHASH_IN = Script.prototype.isScriptHashIn;
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Script.identifiers.DATA_OUT = Script.prototype.isDataOut;
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/**
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* @returns {object} The Script type if it is a known form,
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* or Script.UNKNOWN if it isn't
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*/
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Script.prototype.classify = function() {
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for (var type in Script.identifiers) {
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if (Script.identifiers[type].bind(this)()) {
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return Script.types[type];
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}
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}
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return Script.types.UNKNOWN;
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};
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/**
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* @returns true if script is one of the known types
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*/
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Script.prototype.isStandard = function() {
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// TODO: Add BIP62 compliance
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return this.classify() !== Script.types.UNKNOWN;
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};
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// Script construction methods
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/**
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* Adds a script element at the start of the script.
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* @param {*} obj a string, number, Opcode, Bufer, or object to add
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* @returns {Script} this script instance
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*/
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Script.prototype.prepend = function(obj) {
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this._addByType(obj, true);
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return this;
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};
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/**
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* Compares a script with another script
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*/
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Script.prototype.equals = function(script) {
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$.checkState(script instanceof Script, 'Must provide another script');
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if (this.chunks.length !== script.chunks.length) {
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return false;
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}
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var i;
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for (i = 0; i < this.chunks.length; i++) {
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if (BufferUtil.isBuffer(this.chunks[i]) && !BufferUtil.isBuffer(script.chunks[i])) {
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return false;
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} else if (this.chunks[i] instanceof Opcode && !(script.chunks[i] instanceof Opcode)) {
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return false;
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}
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if (BufferUtil.isBuffer(this.chunks[i]) && !BufferUtil.equals(this.chunks[i], script.chunks[i])) {
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return false;
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} else if (this.chunks[i].num !== script.chunks[i].num) {
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return false;
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}
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}
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return true;
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};
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/**
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* Adds a script element to the end of the script.
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*
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* @param {*} obj a string, number, Opcode, Bufer, or object to add
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* @returns {Script} this script instance
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*
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*/
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Script.prototype.add = function(obj) {
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this._addByType(obj, false);
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return this;
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};
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Script.prototype._addByType = function(obj, prepend) {
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if (typeof obj === 'string') {
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this._addOpcode(obj, prepend);
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} else if (typeof obj === 'number') {
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this._addOpcode(obj, prepend);
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} else if (obj.constructor && obj.constructor.name && obj.constructor.name === 'Opcode') {
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this._addOpcode(obj, prepend);
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} else if (BufferUtil.isBuffer(obj)) {
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this._addBuffer(obj, prepend);
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} else if (typeof obj === 'object') {
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this._insertAtPosition(obj, prepend);
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} else if (obj instanceof Script) {
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this.chunks = this.chunks.concat(obj.chunks);
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} else {
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throw new Error('Invalid script chunk');
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}
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};
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Script.prototype._insertAtPosition = function(op, prepend) {
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if (prepend) {
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this.chunks.unshift(op);
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} else {
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this.chunks.push(op);
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}
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};
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Script.prototype._addOpcode = function(opcode, prepend) {
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var op;
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if (typeof opcode === 'number') {
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op = opcode;
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} else if (opcode.constructor && opcode.constructor.name && opcode.constructor.name === 'Opcode') {
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op = opcode.toNumber();
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} else {
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op = Opcode(opcode).toNumber();
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}
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this._insertAtPosition({
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opcodenum: op
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}, prepend);
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return this;
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};
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Script.prototype._addBuffer = function(buf, prepend) {
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var opcodenum;
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var len = buf.length;
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if (len >= 0 && len < Opcode.OP_PUSHDATA1) {
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opcodenum = len;
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} else if (len < Math.pow(2, 8)) {
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opcodenum = Opcode.OP_PUSHDATA1;
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} else if (len < Math.pow(2, 16)) {
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opcodenum = Opcode.OP_PUSHDATA2;
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} else if (len < Math.pow(2, 32)) {
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opcodenum = Opcode.OP_PUSHDATA4;
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} else {
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throw new Error('You can\'t push that much data');
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}
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this._insertAtPosition({
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buf: buf,
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len: len,
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opcodenum: opcodenum
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}, prepend);
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return this;
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};
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Script.prototype.removeCodeseparators = function() {
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var chunks = [];
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for (var i = 0; i < this.chunks.length; i++) {
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if (this.chunks[i].opcodenum !== Opcode.OP_CODESEPARATOR) {
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chunks.push(this.chunks[i]);
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}
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}
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this.chunks = chunks;
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return this;
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};
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// high level script builder methods
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/**
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* @returns a new Multisig output script for given public keys,
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* requiring m of those public keys to spend
|
|
* @param {PublicKey[]} pubkeys - list of all public keys controlling the output
|
|
* @param {number} m - amount of required signatures to spend the output
|
|
* @param {Object} [opts] - Several options:
|
|
* - noSorting: defaults to false, if true, don't sort the given
|
|
* public keys before creating the script
|
|
*/
|
|
Script.buildMultisigOut = function(pubkeys, m, opts) {
|
|
opts = opts || {};
|
|
var s = new Script();
|
|
s.add(Opcode.smallInt(m));
|
|
pubkeys = _.map(pubkeys, function(pubkey) { return PublicKey(pubkey); });
|
|
var sorted = pubkeys;
|
|
if (!opts.noSorting) {
|
|
sorted = _.sortBy(pubkeys, function(pubkey) {
|
|
return pubkey.toString('hex');
|
|
});
|
|
}
|
|
for (var i = 0; i < sorted.length; i++) {
|
|
var pubkey = sorted[i];
|
|
s.add(pubkey.toBuffer());
|
|
}
|
|
s.add(Opcode.smallInt(pubkeys.length));
|
|
s.add(Opcode.OP_CHECKMULTISIG);
|
|
return s;
|
|
};
|
|
|
|
/**
|
|
* A new P2SH Multisig input script for the given public keys, requiring m of those public keys to spend
|
|
*
|
|
* @param {PublicKey[]} pubkeys list of all public keys controlling the output
|
|
* @param {number} threshold amount of required signatures to spend the output
|
|
* @param {Array} signatures signatures to append to the script
|
|
* @param {Object=} opts
|
|
* @param {boolean=false} opts.noSorting don't sort the given public keys before creating the script
|
|
* @param {Script=} opts.cachedMultisig don't recalculate the redeemScript
|
|
*
|
|
* @returns Script
|
|
*/
|
|
Script.buildP2SHMultisigIn = function(pubkeys, threshold, signatures, opts) {
|
|
opts = opts || {};
|
|
var s = new Script();
|
|
s.add(Opcode.OP_0);
|
|
_.each(signatures, function(signature) {
|
|
s.add(signature);
|
|
});
|
|
s.add((opts.cachedMultisig || Script.buildMultisigOut(pubkeys, threshold, opts)).toBuffer());
|
|
return s;
|
|
};
|
|
|
|
/**
|
|
* @returns a new pay to public key hash output for the given
|
|
* address or public key
|
|
* @param {(Address|PublicKey)} to - destination address or public key
|
|
*/
|
|
Script.buildPublicKeyHashOut = function(to) {
|
|
if (to instanceof PublicKey) {
|
|
to = to.toAddress();
|
|
} else if (_.isString(to)) {
|
|
to = new Address(to);
|
|
}
|
|
var s = new Script();
|
|
s.add(Opcode.OP_DUP)
|
|
.add(Opcode.OP_HASH160)
|
|
.add(to.hashBuffer)
|
|
.add(Opcode.OP_EQUALVERIFY)
|
|
.add(Opcode.OP_CHECKSIG);
|
|
return s;
|
|
};
|
|
|
|
/**
|
|
* @returns a new pay to public key output for the given
|
|
* public key
|
|
*/
|
|
Script.buildPublicKeyOut = function(pubkey) {
|
|
var s = new Script();
|
|
s.add(pubkey.toBuffer())
|
|
.add(Opcode.OP_CHECKSIG);
|
|
return s;
|
|
};
|
|
|
|
/**
|
|
* @returns a new OP_RETURN script with data
|
|
* @param {(string|Buffer)} to - the data to embed in the output
|
|
*/
|
|
Script.buildDataOut = function(data) {
|
|
if (typeof data === 'string') {
|
|
data = new Buffer(data);
|
|
}
|
|
var s = new Script();
|
|
s.add(Opcode.OP_RETURN);
|
|
if (!_.isUndefined(data)) {
|
|
s.add(data);
|
|
}
|
|
return s;
|
|
};
|
|
|
|
/**
|
|
* @param {Script} script - the redeemScript for the new p2sh output
|
|
* @returns Script new pay to script hash script for given script
|
|
*/
|
|
Script.buildScriptHashOut = function(script) {
|
|
var s = new Script();
|
|
s.add(Opcode.OP_HASH160)
|
|
.add(Hash.sha256ripemd160(script.toBuffer()))
|
|
.add(Opcode.OP_EQUAL);
|
|
return s;
|
|
};
|
|
|
|
/**
|
|
* Builds a scriptSig (a script for an input) that signs a public key hash
|
|
* output script.
|
|
*
|
|
* @param {Buffer|string|PublicKey} publicKey
|
|
* @param {Buffer} signature - the signature in DER cannonical encoding
|
|
* @param {number=1} sigtype - the type of the signature (defaults to SIGHASH_ALL)
|
|
*/
|
|
Script.buildPublicKeyHashIn = function(publicKey, signature, sigtype) {
|
|
var script = new Script()
|
|
.add(BufferUtil.concat([
|
|
signature,
|
|
BufferUtil.integerAsSingleByteBuffer(sigtype || Signature.SIGHASH_ALL)
|
|
]))
|
|
.add(new PublicKey(publicKey).toBuffer());
|
|
return script;
|
|
};
|
|
|
|
/**
|
|
* @returns Script an empty script
|
|
*/
|
|
Script.empty = function() {
|
|
return new Script();
|
|
};
|
|
|
|
/**
|
|
* @returns Script a new pay to script hash script that pays to this script
|
|
*/
|
|
Script.prototype.toScriptHashOut = function() {
|
|
return Script.buildScriptHashOut(this);
|
|
};
|
|
|
|
/**
|
|
* @return Script a script built from the address
|
|
*/
|
|
Script.fromAddress = function(address) {
|
|
address = Address(address);
|
|
if (address.isPayToScriptHash()) {
|
|
return Script.buildScriptHashOut(address);
|
|
} else if (address.isPayToPublicKeyHash()) {
|
|
return Script.buildPublicKeyHashOut(address);
|
|
}
|
|
throw new errors.Script.UnrecognizedAddress(address);
|
|
};
|
|
|
|
/**
|
|
* Analagous to bitcoind's FindAndDelete. Find and delete equivalent chunks,
|
|
* typically used with push data chunks. Note that this will find and delete
|
|
* not just the same data, but the same data with the same push data op as
|
|
* produced by default. i.e., if a pushdata in a tx does not use the minimal
|
|
* pushdata op, then when you try to remove the data it is pushing, it will not
|
|
* be removed, because they do not use the same pushdata op.
|
|
*/
|
|
Script.prototype.findAndDelete = function(script) {
|
|
var buf = script.toBuffer();
|
|
var hex = buf.toString('hex');
|
|
for (var i = 0; i < this.chunks.length; i++) {
|
|
var script2 = Script({
|
|
chunks: [this.chunks[i]]
|
|
});
|
|
var buf2 = script2.toBuffer();
|
|
var hex2 = buf2.toString('hex');
|
|
if (hex === hex2) {
|
|
this.chunks.splice(i, 1);
|
|
}
|
|
}
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* @returns true if the chunk {i} is the smallest way to push that particular data.
|
|
* Comes from bitcoind's script interpreter CheckMinimalPush function
|
|
*/
|
|
Script.prototype.checkMinimalPush = function(i) {
|
|
var chunk = this.chunks[i];
|
|
var buf = chunk.buf;
|
|
var opcodenum = chunk.opcodenum;
|
|
if (!buf) {
|
|
return true;
|
|
}
|
|
if (buf.length === 0) {
|
|
// Could have used OP_0.
|
|
return opcodenum === Opcode.OP_0;
|
|
} else if (buf.length === 1 && buf[0] >= 1 && buf[0] <= 16) {
|
|
// Could have used OP_1 .. OP_16.
|
|
return opcodenum === Opcode.OP_1 + (buf[0] - 1);
|
|
} else if (buf.length === 1 && buf[0] === 0x81) {
|
|
// Could have used OP_1NEGATE
|
|
return opcodenum === Opcode.OP_1NEGATE;
|
|
} else if (buf.length <= 75) {
|
|
// Could have used a direct push (opcode indicating number of bytes pushed + those bytes).
|
|
return opcodenum === buf.length;
|
|
} else if (buf.length <= 255) {
|
|
// Could have used OP_PUSHDATA.
|
|
return opcodenum === Opcode.OP_PUSHDATA1;
|
|
} else if (buf.length <= 65535) {
|
|
// Could have used OP_PUSHDATA2.
|
|
return opcodenum === Opcode.OP_PUSHDATA2;
|
|
}
|
|
return true;
|
|
};
|
|
|
|
module.exports = Script;
|