Rewrite transaction parser and add unit test for getTransaction

src/api/ledger/parse/order.js

@@ -0,0 +1,26 @@
+'use strict';
+const assert = require('assert');
+const utils = require('./utils');
+const parseAmount = require('./amount');
+const flags = utils.core.Transaction.flags.OfferCreate;
+
+function parseOrder(tx) {
+  assert(tx.TransactionType === 'OfferCreate');
+
+  const direction = (tx.Flags & flags.Sell) === 0 ? 'buy' : 'sell';
+  const takerGets = parseAmount(tx.TakerGets);
+  const takerPays = parseAmount(tx.TakerPays);
+  const quantity = (direction === 'buy') ? takerPays : takerGets;
+  const totalPrice = (direction === 'buy') ? takerGets : takerPays;
+
+  return {
+    direction: direction,
+    quantity: quantity,
+    totalPrice: totalPrice,
+    passive: (tx.Flags & flags.Passive) !== 0,
+    immediateOrCancel: (tx.Flags & flags.ImmediateOrCancel) !== 0,
+    fillOrKill: (tx.Flags & flags.FillOrKill) !== 0
+  };
+}
+
+module.exports = parseOrder;