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)

lms/djangoapps/courseware/access.py

@@ -32,7 +32,10 @@ from student.roles import (
     GlobalStaff, CourseStaffRole, CourseInstructorRole,
     OrgStaffRole, OrgInstructorRole, CourseBetaTesterRole
 )
-from util.milestones_helpers import get_pre_requisite_courses_not_completed
+from util.milestones_helpers import (
+    get_pre_requisite_courses_not_completed,
+    any_unfulfilled_milestones,
+)
 
 import dogstats_wrapper as dog_stats_api
 
@@ -173,7 +176,12 @@ def _has_access_course_desc(user, action, course):
             # check start date
             can_load() and
             # check mobile_available flag
-            is_mobile_available_for_user(user, course)
+            is_mobile_available_for_user(user, course) and
+            # check staff access, if not then check for unfulfilled milestones
+            (
+                _has_staff_access_to_descriptor(user, course, course.id) or
+                not any_unfulfilled_milestones(course.id, user.id)
+            )
         )
 
     def can_enroll():

lms/djangoapps/courseware/tests/helpers.py

@@ -2,16 +2,14 @@ import json
 
 from django.contrib.auth.models import User
 from django.core.urlresolvers import reverse
+from django.test import TestCase
 from django.test.client import RequestFactory
 
 from student.models import Registration
 
-from django.test import TestCase
-
 
 def get_request_for_user(user):
     """Create a request object for user."""
-
     request = RequestFactory()
     request.user = user
     request.COOKIES = {}

lms/djangoapps/mobile_api/test_milestones.py

+"""
+Milestone related tests for the mobile_api
+"""
+from mock import patch
+
+from courseware.tests.helpers import get_request_for_user
+from courseware.tests.test_entrance_exam import answer_entrance_exam_problem, add_entrance_exam_milestone
+from util.milestones_helpers import (
+    add_prerequisite_course,
+    fulfill_course_milestone,
+    seed_milestone_relationship_types,
+)
+from xmodule.modulestore.django import modulestore
+from xmodule.modulestore.tests.factories import CourseFactory, ItemFactory
+
+
+class MobileAPIMilestonesMixin(object):
+    """
+    Tests the Mobile API decorators for milestones.
+
+    The two milestones currently supported in these tests are entrance exams and
+    pre-requisite courses. If either of these milestones are unfulfilled,
+    the mobile api will appropriately block content until the milestone is
+    fulfilled.
+    """
+    MILESTONE_MESSAGE = {
+        'developer_message':
+            'Cannot access content with unfulfilled pre-requisites or unpassed entrance exam.'
+    }
+
+    ALLOW_ACCESS_TO_MILESTONE_COURSE = False  # pylint: disable=invalid-name
+
+    @patch.dict('django.conf.settings.FEATURES', {'ENABLE_PREREQUISITE_COURSES': True, 'MILESTONES_APP': True})
+    def test_unfulfilled_prerequisite_course(self):
+        """ Tests the case for an unfulfilled pre-requisite course """
+        self._add_prerequisite_course()
+        self.init_course_access()
+        self._verify_unfulfilled_milestone_response()
+
+    @patch.dict('django.conf.settings.FEATURES', {'ENABLE_PREREQUISITE_COURSES': True, 'MILESTONES_APP': True})
+    def test_unfulfilled_prerequisite_course_for_staff(self):
+        self._add_prerequisite_course()
+        self.user.is_staff = True
+        self.user.save()
+        self.init_course_access()
+        self.api_response()
+
+    @patch.dict('django.conf.settings.FEATURES', {'ENABLE_PREREQUISITE_COURSES': True, 'MILESTONES_APP': True})
+    def test_fulfilled_prerequisite_course(self):
+        """
+        Tests the case when a user fulfills existing pre-requisite course
+        """
+        self._add_prerequisite_course()
+        add_prerequisite_course(self.course.id, self.prereq_course.id)
+        fulfill_course_milestone(self.prereq_course.id, self.user)
+        self.init_course_access()
+        self.api_response()
+
+    @patch.dict('django.conf.settings.FEATURES', {'ENTRANCE_EXAMS': True, 'MILESTONES_APP': True})
+    def test_unpassed_entrance_exam(self):
+        """
+        Tests the case where the user has not passed the entrance exam
+        """
+        self._add_entrance_exam()
+        self.init_course_access()
+        self._verify_unfulfilled_milestone_response()
+
+    @patch.dict('django.conf.settings.FEATURES', {'ENTRANCE_EXAMS': True, 'MILESTONES_APP': True})
+    def test_unpassed_entrance_exam_for_staff(self):
+        self._add_entrance_exam()
+        self.user.is_staff = True
+        self.user.save()
+        self.init_course_access()
+        self.api_response()
+
+    @patch.dict('django.conf.settings.FEATURES', {'ENTRANCE_EXAMS': True, 'MILESTONES_APP': True})
+    def test_passed_entrance_exam(self):
+        """
+        Tests access when user has passed the entrance exam
+        """
+        self._add_entrance_exam()
+        self._pass_entrance_exam()
+        self.init_course_access()
+        self.api_response()
+
+    def _add_entrance_exam(self):
+        """ Sets up entrance exam """
+        seed_milestone_relationship_types()
+        self.course.entrance_exam_enabled = True
+
+        self.entrance_exam = ItemFactory.create(  # pylint: disable=attribute-defined-outside-init
+            parent=self.course,
+            category="chapter",
+            display_name="Entrance Exam Chapter",
+            is_entrance_exam=True,
+            in_entrance_exam=True
+        )
+        self.problem_1 = ItemFactory.create(  # pylint: disable=attribute-defined-outside-init
+            parent=self.entrance_exam,
+            category='problem',
+            display_name="The Only Exam Problem",
+            graded=True,
+            in_entrance_exam=True
+        )
+
+        add_entrance_exam_milestone(self.course, self.entrance_exam)
+
+        self.course.entrance_exam_minimum_score_pct = 0.50
+        self.course.entrance_exam_id = unicode(self.entrance_exam.location)
+        modulestore().update_item(self.course, self.user.id)
+
+    def _add_prerequisite_course(self):
+        """ Helper method to set up the prerequisite course """
+        seed_milestone_relationship_types()
+        self.prereq_course = CourseFactory.create()  # pylint: disable=attribute-defined-outside-init
+        add_prerequisite_course(self.course.id, self.prereq_course.id)
+
+    def _pass_entrance_exam(self):
+        """ Helper function to pass the entrance exam """
+        request = get_request_for_user(self.user)
+        answer_entrance_exam_problem(self.course, request, self.problem_1)
+
+    def _verify_unfulfilled_milestone_response(self):
+        """
+        Verifies the response depending on ALLOW_ACCESS_TO_MILESTONE_COURSE
+
+        Since different endpoints will have different behaviours towards milestones,
+        setting ALLOW_ACCESS_TO_MILESTONE_COURSE (default is False) to True, will
+        not return a 204. For example, when getting a list of courses a user is
+        enrolled in, although a user may have unfulfilled milestones, the course
+        should still show up in the course enrollments list.
+        """
+        if self.ALLOW_ACCESS_TO_MILESTONE_COURSE:
+            self.api_response()
+        else:
+            response = self.api_response(expected_response_code=204)
+            self.assertEqual(response.data, self.MILESTONE_MESSAGE)

lms/djangoapps/mobile_api/testutils.py

@@ -13,18 +13,21 @@ Test utilities for mobile API tests:
 # pylint: disable=no-member
 import ddt
 from mock import patch
-from rest_framework.test import APITestCase
+
 from django.core.urlresolvers import reverse
 
+from rest_framework.test import APITestCase
+
 from opaque_keys.edx.keys import CourseKey
-from courseware.tests.factories import UserFactory
 
+from courseware.tests.factories import UserFactory
 from student import auth
 from student.models import CourseEnrollment
-
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory
 
+from mobile_api.test_milestones import MobileAPIMilestonesMixin
+
 
 class MobileAPITestCase(ModuleStoreTestCase, APITestCase):
     """
@@ -124,7 +127,7 @@ class MobileAuthUserTestMixin(MobileAuthTestMixin):
 
 
 @ddt.ddt
-class MobileCourseAccessTestMixin(object):
+class MobileCourseAccessTestMixin(MobileAPIMilestonesMixin):
     """
     Test Mixin for testing APIs marked with mobile_course_access.
     (Use MobileEnrolledCourseAccessTestMixin when verify_enrolled is set to True.)

lms/djangoapps/mobile_api/users/tests.py

@@ -49,6 +49,7 @@ class TestUserEnrollmentApi(MobileAPITestCase, MobileAuthUserTestMixin, MobileEn
     """
     REVERSE_INFO = {'name': 'courseenrollment-detail', 'params': ['username']}
     ALLOW_ACCESS_TO_UNRELEASED_COURSE = True
+    ALLOW_ACCESS_TO_MILESTONE_COURSE = True
 
     def verify_success(self, response):
         super(TestUserEnrollmentApi, self).verify_success(response)

lms/djangoapps/mobile_api/utils.py

@@ -3,16 +3,21 @@ Common utility methods and decorators for Mobile APIs.
 """
 
 import functools
-from rest_framework import permissions
+
+from django.http import Http404
+
+from rest_framework import permissions, status, response
+
 from opaque_keys.edx.keys import CourseKey
-from xmodule.modulestore.django import modulestore
 
 from courseware.courses import get_course_with_access
+from openedx.core.lib.api.permissions import IsUserInUrl
 from openedx.core.lib.api.authentication import (
     SessionAuthenticationAllowInactiveUser,
     OAuth2AuthenticationAllowInactiveUser,
 )
-from openedx.core.lib.api.permissions import IsUserInUrl
+from util.milestones_helpers import any_unfulfilled_milestones
+from xmodule.modulestore.django import modulestore
 
 
 def mobile_course_access(depth=0, verify_enrolled=True):
@@ -30,12 +35,25 @@ def mobile_course_access(depth=0, verify_enrolled=True):
             """
             course_id = CourseKey.from_string(kwargs.pop('course_id'))
             with modulestore().bulk_operations(course_id):
-                course = get_course_with_access(
-                    request.user,
-                    'load_mobile' if verify_enrolled else 'load_mobile_no_enrollment_check',
-                    course_id,
-                    depth=depth
-                )
+                try:
+                    course = get_course_with_access(
+                        request.user,
+                        'load_mobile' if verify_enrolled else 'load_mobile_no_enrollment_check',
+                        course_id,
+                        depth=depth
+                    )
+                except Http404:
+                    # any_unfulfilled_milestones called a second time since get_course_with_access returns a bool
+                    if any_unfulfilled_milestones(course_id, request.user.id):
+                        message = {
+                            "developer_message": "Cannot access content with unfulfilled pre-requisites or unpassed entrance exam."  # pylint: disable=line-too-long
+                        }
+                        return response.Response(
+                            data=message,
+                            status=status.HTTP_204_NO_CONTENT
+                        )
+                    else:
+                        raise
                 return func(self, request, course=course, *args, **kwargs)
         return _wrapper
     return _decorator

lms/envs/test.py

@@ -452,12 +452,6 @@ FEATURES['ENABLE_EDXNOTES'] = True
 # Add milestones to Installed apps for testing
 INSTALLED_APPS += ('milestones', )
 
-# MILESTONES
-FEATURES['MILESTONES_APP'] = True
-
-# ENTRANCE EXAMS
-FEATURES['ENTRANCE_EXAMS'] = True
-
 # Enable courseware search for tests
 FEATURES['ENABLE_COURSEWARE_SEARCH'] = True