Add _get_request_value to safely access request.REQUEST for browser events.

common/djangoapps/track/views/__init__.py

@@ -30,6 +30,14 @@ def _get_request_header(request, header_name, default=''):
         return default
 
 
+def _get_request_value(request, value_name, default=''):
+    """Helper method to get header values from a request's REQUEST dict, if present."""
+    if request is not None and hasattr(request, 'REQUEST') and value_name in request.REQUEST:
+        return request.REQUEST[value_name]
+    else:
+        return default
+
+
 def user_track(request):
     """
     Log when POST call to "event" URL is made by a user. Uses request.REQUEST
@@ -42,7 +50,7 @@ def user_track(request):
     except:
         username = "anonymous"
 
-    page = request.REQUEST['page']
+    page = _get_request_value(request, 'page')
 
     with eventtracker.get_tracker().context('edx.course.browser', contexts.course_context_from_url(page)):
         context = eventtracker.get_tracker().resolve_context()
@@ -51,8 +59,8 @@ def user_track(request):
             "session": context.get('session', ''),
             "ip": _get_request_header(request, 'REMOTE_ADDR'),
             "event_source": "browser",
-            "event_type": request.REQUEST['event_type'],
-            "event": request.REQUEST['event'],
+            "event_type": _get_request_value(request, 'event_type'),
+            "event": _get_request_value(request, 'event'),
             "agent": _get_request_header(request, 'HTTP_USER_AGENT'),
             "page": page,
             "time": datetime.datetime.utcnow(),

common/djangoapps/track/views/tests/test_views.py

@@ -59,6 +59,30 @@ class TestTrackViews(TestCase):
         self.mock_tracker.send.assert_called_once_with(expected_event)
 
     @freeze_time(expected_time)
+    def test_user_track_with_missing_values(self):
+        request = self.request_factory.get('/event')
+        with tracker.get_tracker().context('edx.request', {'session': sentinel.session}):
+            views.user_track(request)
+
+        expected_event = {
+            'username': 'anonymous',
+            'session': sentinel.session,
+            'ip': '127.0.0.1',
+            'event_source': 'browser',
+            'event_type': '',
+            'event': '',
+            'agent': '',
+            'page': '',
+            'time': expected_time,
+            'host': 'testserver',
+            'context': {
+                'course_id': '',
+                'org_id': '',
+            },
+        }
+        self.mock_tracker.send.assert_called_once_with(expected_event)
+
+    @freeze_time(expected_time)
     def test_user_track_with_middleware(self):
         middleware = TrackMiddleware()
         request = self.request_factory.get('/event', {