MA-635 Block Mobile Content for unfulfilled milestones

Previously, the mobile api did not check for pre-requisite courses
or entrance exams. This change checks for these milestones and then
returns course content accordingly.

common/djangoapps/util/milestones_helpers.py

@@ -7,7 +7,8 @@ from django.conf import settings
 from django.utils.translation import ugettext as _
 
 from opaque_keys import InvalidKeyError
-from opaque_keys.edx.keys import CourseKey, UsageKey
+from opaque_keys.edx.keys import CourseKey
+
 from xmodule.modulestore.django import modulestore
 
 NAMESPACE_CHOICES = {
@@ -26,7 +27,7 @@ def add_prerequisite_course(course_key, prerequisite_course_key):
     """
     It would create a milestone, then it would set newly created
     milestones as requirement for course referred by `course_key`
-    and it would set newly created milestone as fulfilment
+    and it would set newly created milestone as fulfillment
     milestone for course referred by `prerequisite_course_key`.
     """
     if not settings.FEATURES.get('ENABLE_PREREQUISITE_COURSES', False):
@@ -313,6 +314,15 @@ def remove_content_references(content_id):
     return milestones_api.remove_content_references(content_id)
 
 
+def any_unfulfilled_milestones(course_id, user_id):
+    """ Returns a boolean if user has any unfulfilled milestones """
+    if not settings.FEATURES.get('MILESTONES_APP', False):
+        return False
+    return bool(
+        get_course_milestones_fulfillment_paths(course_id, {"id": user_id})
+    )
+
+
 def get_course_milestones_fulfillment_paths(course_id, user_id):
     """
     Client API operation adapter/wrapper

common/djangoapps/util/tests/test_milestones_helpers.py

@@ -3,6 +3,8 @@ Tests for the milestones helpers library, which is the integration point for the
 """
 
 from mock import patch
+
+from milestones.exceptions import InvalidCourseKeyException, InvalidUserException
 from util import milestones_helpers
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
@@ -85,3 +87,11 @@ class MilestonesHelpersTestCase(ModuleStoreTestCase):
     def test_add_user_milestone_returns_none_when_app_disabled(self):
         response = milestones_helpers.add_user_milestone(self.user, self.milestone)
         self.assertIsNone(response)
+
+    @patch.dict('django.conf.settings.FEATURES', {'MILESTONES_APP': True})
+    def test_any_unfulfilled_milestones(self):
+        """ Tests any_unfulfilled_milestones for invalid arguments """
+        with self.assertRaises(InvalidCourseKeyException):
+            milestones_helpers.any_unfulfilled_milestones(None, self.user)
+        with self.assertRaises(InvalidUserException):
+            milestones_helpers.any_unfulfilled_milestones(self.course.id, None)