From 83874ec0962da311b76f2385623e51c68bc39035 Mon Sep 17 00:00:00 2001
From: Alan Cohen <alan@ripple.com>
Date: Fri, 7 Aug 2015 09:55:25 -0700
Subject: [PATCH] Don't set empty paths

"The Paths field must not be an empty array, nor an array whose members are all
empty arrays."
https://ripple.com/build/transactions/#paths

Fix test file lint errors
---
 src/core/transaction.js  |   8 ++-
 test/transaction-test.js | 123 +++++++++++++++++++++++----------------
 2 files changed, 78 insertions(+), 53 deletions(-)

diff --git a/src/core/transaction.js b/src/core/transaction.js
index 841986eb..465e9cde 100644
--- a/src/core/transaction.js
+++ b/src/core/transaction.js
@@ -344,8 +344,8 @@ Transaction.prototype._computeFee = function() {
   }
 
   switch (fees.length) {
-    case 0: return undefined;
-    case 1: return String(fees[0]);
+  case 0: return undefined;
+  case 1: return String(fees[0]);
   }
 
   fees.sort(function ascending(a, b) {
@@ -1181,6 +1181,10 @@ Transaction.prototype.paths = function(paths) {
     throw new Error('Paths must be an array');
   }
 
+  if (paths.length === 0) {
+    return this;
+  }
+
   this.tx_json.Paths = [];
   paths.forEach(this.addPath, this);
 
diff --git a/test/transaction-test.js b/test/transaction-test.js
index 7d8ba611..9e850781 100644
--- a/test/transaction-test.js
+++ b/test/transaction-test.js
@@ -649,26 +649,26 @@ describe('Transaction', function() {
       Paths: [
         [
           {
-        account: 'rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q',
-        currency: 'USD',
-        issuer: 'rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q',
-        type: 49,
-        type_hex: '0000000000000031'
-      },
-      {
-        currency: 'LTC',
-        issuer: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
-        type: 48,
-        type_hex: '0000000000000030'
-      },
-      {
-        account: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
-        currency: 'LTC',
-        issuer: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
-        type: 49,
-        type_hex: '0000000000000031'
-      }
-      ]
+            account: 'rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q',
+            currency: 'USD',
+            issuer: 'rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q',
+            type: 49,
+            type_hex: '0000000000000031'
+          },
+          {
+            currency: 'LTC',
+            issuer: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
+            type: 48,
+            type_hex: '0000000000000030'
+          },
+          {
+            account: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
+            currency: 'LTC',
+            issuer: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
+            type: 49,
+            type_hex: '0000000000000031'
+          }
+        ]
       ],
       SendMax: {
         currency: 'USD',
@@ -778,26 +778,26 @@ describe('Transaction', function() {
       Paths: [
         [
           {
-        account: 'rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q',
-        currency: 'USD',
-        issuer: 'rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q',
-        type: 49,
-        type_hex: '0000000000000031'
-      },
-      {
-        currency: 'LTC',
-        issuer: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
-        type: 48,
-        type_hex: '0000000000000030'
-      },
-      {
-        account: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
-        currency: 'LTC',
-        issuer: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
-        type: 49,
-        type_hex: '0000000000000031'
-      }
-      ]
+            account: 'rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q',
+            currency: 'USD',
+            issuer: 'rMwjYedjc7qqtKYVLiAccJSmCwih4LnE2q',
+            type: 49,
+            type_hex: '0000000000000031'
+          },
+          {
+            currency: 'LTC',
+            issuer: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
+            type: 48,
+            type_hex: '0000000000000030'
+          },
+          {
+            account: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
+            currency: 'LTC',
+            issuer: 'rfYv1TXnwgDDK4WQNbFALykYuEBnrR4pDX',
+            type: 49,
+            type_hex: '0000000000000031'
+          }
+        ]
       ],
       SendMax: {
         currency: 'USD',
@@ -1136,17 +1136,17 @@ describe('Transaction', function() {
 
     const paths = [
       [{
-      account: 'rP51ycDJw5ZhgvdKiRjBYZKYjsyoCcHmnY',
-      issuer: 'rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm',
-      test: 1,
-      currency: 'USD'
-    }],
-    [{
-      account: 'rP51ycDJw5ZhgvdKiRjBYZKYjsyoCcHmnY',
-      issuer: 'rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm',
-      test: 2,
-      currency: 'USD'
-    }]
+        account: 'rP51ycDJw5ZhgvdKiRjBYZKYjsyoCcHmnY',
+        issuer: 'rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm',
+        test: 1,
+        currency: 'USD'
+      }],
+      [{
+        account: 'rP51ycDJw5ZhgvdKiRjBYZKYjsyoCcHmnY',
+        issuer: 'rsLEU1TPdCJPPysqhWYw9jD97xtG5WqSJm',
+        test: 2,
+        currency: 'USD'
+      }]
     ];
 
 //     assert.throws(function() {
@@ -1184,6 +1184,27 @@ describe('Transaction', function() {
     ]);
   });
 
+  it('Does not add empty transaction paths', function() {
+    const transaction = new Transaction();
+
+    const paths = [];
+
+    assert.strictEqual(transaction.tx_json.Paths, undefined);
+
+    transaction.setType('Payment');
+
+    assert.throws(function() {
+      transaction.paths(1);
+    }, /Error: Paths must be an array/);
+    assert.throws(function() {
+      transaction.setPaths(1);
+    }, /Error: Paths must be an array/);
+
+    transaction.setPaths(paths);
+
+    assert.strictEqual(transaction.tx_json.Paths, undefined);
+  });
+
   it('Set secret', function() {
     const transaction = new Transaction();
     transaction.secret('shHXjwp9m3MDQNcUrTekXcdzFsCjM');