Add AccountTxnID flag and setter

src/js/ripple/transaction.js

@@ -132,6 +132,7 @@ Transaction.set_clear_flags = {
     asfRequireAuth:    2,
     asfDisallowXRP:    3,
     asfDisableMaster:  4,
+    asfAccountTxnID:   5,
     asfNoFreeze:       6,
     asfGlobalFreeze:   7
   }
@@ -859,6 +860,15 @@ Transaction.prototype.addMemo = function(memoType, memoFormat, memoData) {
   return this;
 };
 
+Transaction.prototype.setAccountTxnID =
+Transaction.prototype.accountTxnID = function(id) {
+  if (typeof id === 'string') {
+    this.tx_json.AccountTxnID = id;
+  }
+
+  return this;
+};
+
 /**
  * Construct an 'AccountSet' transaction
  *

test/transaction-test.js

@@ -1215,14 +1215,15 @@ describe('Transaction', function() {
     ]);
   });
 
-  it('Construct AccountSet transaction', function() {
-    var transaction = new Transaction().accountSet('rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm');
-
+  it('Set AccountTxnID', function() {
+    var transaction = new Transaction();
     assert(transaction instanceof Transaction);
+
+    transaction.accountTxnID('75C5A92212AA82A89C3824F6F071FE49C95C45DE9113EB51763A217DBACB5B4F');
+
     assert.deepEqual(transaction.tx_json, {
       Flags: 0,
-      TransactionType: 'AccountSet',
-      Account: 'rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm'
+      AccountTxnID: '75C5A92212AA82A89C3824F6F071FE49C95C45DE9113EB51763A217DBACB5B4F'
     });
   });
 
@@ -1239,6 +1240,18 @@ describe('Transaction', function() {
     });
   });
 
+  it('Construct AccountSet transaction - with AccountTxnID SetFlag', function() {
+    var transaction = new Transaction().accountSet('rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm', 'asfAccountTxnID');
+
+    assert(transaction instanceof Transaction);
+    assert.deepEqual(transaction.tx_json, {
+      Flags: 0,
+      SetFlag: 5,
+      TransactionType: 'AccountSet',
+      Account: 'rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm'
+    });
+  });
+
   it('Construct AccountSet transaction - params object', function() {
     var transaction = new Transaction().accountSet({
       account: 'rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm',