Fixed REFER NOTIFY parsing in accordance to RFC 3515 section 2.4.5 (v…

…ersatica#767)

* Fixed REFER NOTIFY parsing to only parse the first line as a status line of a message/sipfrag body in accordance with RFC 3515 section 2.4.5.

* Added a test for status line parsing.

lib/RTCSession/ReferSubscriber.js

@@ -102,7 +102,7 @@ module.exports = class ReferSubscriber extends EventEmitter
       return;
     }
 
-    const status_line = Grammar.parse(request.body.trim(), 'Status_Line');
+    const status_line = Grammar.parse(request.body.trim().split('\r\n', 1)[0], 'Status_Line');
 
     if (status_line === -1)
     {

test/test-parser.js

@@ -410,6 +410,17 @@ module.exports = {
     test.strictEqual(parsed.to_tag, '03aq91cl9n');
     test.strictEqual(parsed.from_tag, 'kun98clbf7');
 
+    test.done();
+  },
+
+  'parse Status Line' : function(test)
+  {
+    const data = 'SIP/2.0 420 Bad Extension';
+    let parsed;
+
+    test.ok((parsed = JsSIP.Grammar.parse(data, 'Status_Line')) !== -1);
+    test.strictEqual(parsed.status_code, 420);
+
     test.done();
   }
 };