Rewrite transaction parser and add unit test for getTransaction

src/api/ledger/parse/payment.js

@@ -0,0 +1,48 @@
+'use strict';
+const assert = require('assert');
+const utils = require('./utils');
+const parseAmount = require('./amount');
+const Transaction = utils.core.Transaction;
+
+function isPartialPayment(tx) {
+  return (tx.Flags & Transaction.flags.Payment.PartialPayment) !== 0;
+}
+
+function isNoDirectRipple(tx) {
+  return (tx.Flags & Transaction.flags.Payment.NoRippleDirect) !== 0;
+}
+
+function parsePaymentMemos(tx) {
+  if (!Array.isArray(tx.Memos) || tx.Memos.length === 0) {
+    return undefined;
+  }
+  return tx.Memos.map((m) => m.Memo);
+}
+
+function parsePayment(tx) {
+  assert(tx.TransactionType === 'Payment');
+
+  const source = {
+    address: tx.Account,
+    amount: parseAmount(tx.SendMax || tx.Amount),
+    tag: tx.SourceTag
+  };
+
+  const destination = {
+    address: tx.Destination,
+    amount: parseAmount(tx.Amount),
+    tag: tx.DestinationTag
+  };
+
+  return {
+    source: utils.removeUndefined(source),
+    destination: utils.removeUndefined(destination),
+    memos: parsePaymentMemos(tx),
+    invoiceID: tx.InvoiceID,
+    paths: JSON.stringify(tx.Paths || []),
+    allowPartialPayment: isPartialPayment(tx),
+    noDirectRipple: isNoDirectRipple(tx)
+  };
+}
+
+module.exports = parsePayment;