From 5b25679e15058cd6b9021b0213afab218d540ec0 Mon Sep 17 00:00:00 2001
From: "Ryan X. Charles" <ryan@bitpay.com>
Date: Tue, 16 Sep 2014 14:35:26 -0700
Subject: [PATCH] Transaction

---
 lib/transaction.js  | 77 +++++++++++++++++++++++++++++++++++++++++
 test/transaction.js | 84 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 161 insertions(+)
 create mode 100644 lib/transaction.js
 create mode 100644 test/transaction.js

diff --git a/lib/transaction.js b/lib/transaction.js
new file mode 100644
index 000000000..51c27a1f5
--- /dev/null
+++ b/lib/transaction.js
@@ -0,0 +1,77 @@
+var Txin = require('./txin');
+var Txout = require('./txout');
+var BufferWriter = require('./bufferwriter');
+var BufferReader = require('./bufferreader');
+var Varint = require('./varint');
+
+var Transaction = function Transaction(version, txinsvarint, txins, txoutsvarint, txouts, nlocktime) {
+  if (!(this instanceof Transaction))
+    return new Transaction(version, txinsvarint, txins, txoutsvarint, txouts, nlocktime);
+  if (typeof version === 'number') {
+    this.set({
+      version: version,
+      txinsvarint: txinsvarint,
+      txins: txins,
+      txoutsvarint: txoutsvarint,
+      txouts: txouts,
+      nlocktime: nlocktime
+    });
+  } else if (version) {
+    var obj = version;
+    this.set(obj);
+  }
+};
+
+Transaction.prototype.set = function(obj) {
+  this.version = typeof obj.version !== 'undefined' ? obj.version : this.version;
+  this.txinsvarint = obj.txinsvarint || this.txinsvarint;
+  this.txins = obj.txins || this.txins;
+  this.txoutsvarint = obj.txoutsvarint || this.txoutsvarint;
+  this.txouts = obj.txouts || this.txouts;
+  this.nlocktime = typeof obj.nlocktime !== 'undefined' ? obj.nlocktime : this.nlocktime;
+  return this;
+};
+
+Transaction.prototype.fromBuffer = function(buf) {
+  return this.fromBufferReader(BufferReader(buf));
+};
+
+Transaction.prototype.fromBufferReader = function(br) {
+  this.version = br.readUInt32LE();
+  this.txinsvarint = Varint(br.readVarintBuf());
+  var txinsnum = this.txinsvarint.toNumber();
+  this.txins = [];
+  for (var i = 0; i < txinsnum; i++) {
+    this.txins.push(Txin().fromBufferReader(br));
+  }
+  this.txoutsvarint = Varint(br.readVarintBuf());
+  var txoutsnum = this.txoutsvarint.toNumber();
+  this.txouts = [];
+  for (var i = 0; i < txoutsnum; i++) {
+    this.txouts.push(Txout().fromBufferReader(br));
+  }
+  this.nlocktime = br.readUInt32LE();
+  return this;
+};
+
+Transaction.prototype.toBuffer = function() {
+  return this.toBufferWriter().concat();
+};
+
+Transaction.prototype.toBufferWriter = function(bw) {
+  if (!bw)
+    bw = new BufferWriter();
+  bw.writeUInt32LE(this.version);
+  bw.write(this.txinsvarint.buf);
+  for (var i = 0; i < this.txins.length; i++) {
+    this.txins[i].toBufferWriter(bw);
+  }
+  bw.write(this.txoutsvarint.buf)
+  for (var i = 0; i < this.txouts.length; i++) {
+    this.txouts[i].toBufferWriter(bw);
+  }
+  bw.writeUInt32LE(this.nlocktime);
+  return bw;
+};
+
+module.exports = Transaction;
diff --git a/test/transaction.js b/test/transaction.js
new file mode 100644
index 000000000..13f23cab4
--- /dev/null
+++ b/test/transaction.js
@@ -0,0 +1,84 @@
+var Varint = require('../lib/varint');
+var Transaction = require('../lib/transaction');
+var Txin = require('../lib/txin');
+var Txout = require('../lib/txout');
+var should = require('chai').should();
+var BufferReader = require('../lib/bufferreader');
+var BufferWriter = require('../lib/bufferwriter');
+
+describe('Transaction', function() {
+
+  it('should make a new transaction', function() {
+    var tx = new Transaction();
+    should.exist(tx);
+    tx = Transaction();
+    should.exist(tx);
+  });
+
+  var txin = Txin().fromBuffer(new Buffer('00000000000000000000000000000000000000000000000000000000000000000000000001ae00000000', 'hex'));
+  var txout = Txout().fromBuffer(new Buffer('050000000000000001ae', 'hex'));
+  var tx = Transaction().set({
+    version: 0,
+    txinsvarint: Varint(1),
+    txins: [txin],
+    txoutsvarint: Varint(1),
+    txouts: [txout],
+    nlocktime: 0
+  });
+  var txhex = '000000000100000000000000000000000000000000000000000000000000000000000000000000000001ae0000000001050000000000000001ae00000000';
+  var txbuf = new Buffer(txhex, 'hex');
+
+  describe('#set', function() {
+
+    it('should set all the basic parameters', function() {
+      var tx = Transaction().set({
+        version: 0,
+        txinsvarint: Varint(1),
+        txins: [txin],
+        txoutsvarint: Varint(1),
+        txouts: [txout],
+        nlocktime: 0
+      });
+      should.exist(tx.version);
+      should.exist(tx.txinsvarint);
+      should.exist(tx.txins);
+      should.exist(tx.txoutsvarint);
+      should.exist(tx.txouts);
+      should.exist(tx.nlocktime);
+    });
+
+  });
+
+  describe('#fromBuffer', function() {
+    
+    it('should recover from this known tx', function() {
+      Transaction().fromBuffer(txbuf).toBuffer().toString('hex').should.equal(txhex);
+    });
+
+  });
+
+  describe('#fromBufferReader', function() {
+    
+    it('should recover from this known tx', function() {
+      Transaction().fromBufferReader(BufferReader(txbuf)).toBuffer().toString('hex').should.equal(txhex);
+    });
+
+  });
+
+  describe('#toBuffer', function() {
+    
+    it('should produce this known tx', function() {
+      Transaction().fromBuffer(txbuf).toBuffer().toString('hex').should.equal(txhex);
+    });
+
+  });
+
+  describe('#toBufferWriter', function() {
+    
+    it('should produce this known tx', function() {
+      Transaction().fromBuffer(txbuf).toBufferWriter().concat().toString('hex').should.equal(txhex);
+    });
+
+  });
+
+});