284 lines
7.0 KiB
JavaScript
284 lines
7.0 KiB
JavaScript
'use strict';
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var BufferReader = require('./encoding/bufferreader');
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var BufferWriter = require('./encoding/bufferwriter');
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var Opcode = require('./opcode');
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var Script = function Script(buf) {
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if (!(this instanceof Script))
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return new Script(buf);
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this.chunks = [];
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if (Buffer.isBuffer(buf)) {
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this.fromBuffer(buf);
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}
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else if (typeof buf === 'string') {
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var str = buf;
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this.fromString(str);
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}
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else if (typeof buf !== 'undefined') {
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var obj = buf;
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this.set(obj);
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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.prototype.fromJSON = function(json) {
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return this.fromString(json);
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};
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Script.prototype.toJSON = function() {
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return this.toString();
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};
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Script.prototype.fromBuffer = function(buf) {
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this.chunks = [];
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var br = new BufferReader(buf);
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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.map.OP_PUSHDATA1) {
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len = opcodenum;
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this.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.map.OP_PUSHDATA1) {
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len = br.readUInt8();
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var buf = br.read(len);
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this.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.map.OP_PUSHDATA2) {
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len = br.readUInt16LE();
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buf = br.read(len);
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this.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.map.OP_PUSHDATA4) {
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len = br.readUInt32LE();
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buf = br.read(len);
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this.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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this.chunks.push(opcodenum);
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}
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}
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return this;
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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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if (typeof chunk === 'number') {
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var opcodenum = chunk;
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bw.writeUInt8(opcodenum);
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} else {
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var opcodenum = chunk.opcodenum;
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bw.writeUInt8(chunk.opcodenum);
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if (opcodenum < Opcode.map.OP_PUSHDATA1) {
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bw.write(chunk.buf);
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}
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else if (opcodenum === Opcode.map.OP_PUSHDATA1) {
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bw.writeUInt8(chunk.len);
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bw.write(chunk.buf);
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}
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else if (opcodenum === Opcode.map.OP_PUSHDATA2) {
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bw.writeUInt16LE(chunk.len);
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bw.write(chunk.buf);
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}
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else if (opcodenum === Opcode.map.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.prototype.fromString = function(str) {
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this.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 (typeof opcodenum === 'undefined') {
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opcodenum = parseInt(token);
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if (opcodenum > 0 && opcodenum < Opcode.map.OP_PUSHDATA1) {
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this.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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}
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else {
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throw new Error('Invalid script');
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}
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} else if (opcodenum === Opcode.map.OP_PUSHDATA1 || opcodenum === Opcode.map.OP_PUSHDATA2 || opcodenum === Opcode.map.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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this.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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this.chunks.push(opcodenum);
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i = i + 1;
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}
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}
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return this;
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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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if (typeof chunk === 'number') {
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var opcodenum = chunk;
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str = str + Opcode(opcodenum).toString() + " ";
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} else {
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var opcodenum = chunk.opcodenum;
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if (opcodenum === Opcode.map.OP_PUSHDATA1 || opcodenum === Opcode.map.OP_PUSHDATA2 || opcodenum === Opcode.map.OP_PUSHDATA4)
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str = str + Opcode(opcodenum).toString() + " " ;
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str = str + chunk.len + " " ;
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str = str + "0x" + chunk.buf.toString('hex') + " ";
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}
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}
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return str.substr(0, str.length - 1);
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};
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Script.prototype.isOpReturn = function() {
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if (this.chunks[0] === Opcode('OP_RETURN').toNumber()
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&&
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(this.chunks.length === 1
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||
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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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return true;
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} else {
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return false;
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}
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};
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Script.prototype.isPubkeyhashOut = function() {
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if (this.chunks[0] === Opcode('OP_DUP').toNumber()
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&& this.chunks[1] === Opcode('OP_HASH160').toNumber()
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&& this.chunks[2].buf
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&& this.chunks[3] === Opcode('OP_EQUALVERIFY').toNumber()
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&& this.chunks[4] === Opcode('OP_CHECKSIG').toNumber()) {
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return true;
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} else {
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return false;
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}
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};
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Script.prototype.isPubkeyhashIn = function() {
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if (this.chunks.length === 2
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&& this.chunks[0].buf
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&& this.chunks[1].buf) {
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return true;
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} else {
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return false;
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}
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};
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Script.prototype.isScripthashOut = function() {
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if (this.chunks.length === 3
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&& this.chunks[0] === Opcode('OP_HASH160').toNumber()
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&& this.chunks[1].buf
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&& this.chunks[1].buf.length === 20
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&& this.chunks[2] === Opcode('OP_EQUAL').toNumber()) {
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return true;
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} else {
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return false;
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}
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};
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//note that these are frequently indistinguishable from pubkeyhashin
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Script.prototype.isScripthashIn = function() {
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var allpush = this.chunks.every(function(chunk) {
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return Buffer.isBuffer(chunk.buf);
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});
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if (allpush) {
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return true;
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} else {
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return false;
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}
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};
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Script.prototype.write = function(obj) {
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if (typeof obj === 'string')
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this.writeOp(obj);
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else if (typeof obj === 'number')
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this.writeOp(obj);
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else if (Buffer.isBuffer(obj))
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this.writeBuffer(obj);
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else if (typeof obj === 'object')
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this.chunks.push(obj);
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else
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throw new Error('Invalid script chunk');
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return this;
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};
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Script.prototype.writeOp = function(str) {
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if (typeof str === 'number')
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this.chunks.push(str);
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else
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this.chunks.push(Opcode(str).toNumber());
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return this;
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};
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Script.prototype.writeBuffer = function(buf) {
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var opcodenum;
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var len = buf.length;
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if (buf.length > 0 && buf.length < Opcode.map.OP_PUSHDATA1) {
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opcodenum = buf.length;
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} else if (buf.length < Math.pow(2, 8)) {
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opcodenum = Opcode.map.OP_PUSHDATA1;
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} else if (buf.length < Math.pow(2, 16)) {
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opcodenum = Opcode.map.OP_PUSHDATA2;
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} else if (buf.length < Math.pow(2, 32)) {
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opcodenum = Opcode.map.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.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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return this;
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};
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module.exports = Script;
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