feat: [AXIMST-584] create view for course navigation sidebar (#2511)

* feat: [AXIMST-584] create view for course navigation sidebar

* test: [AXIMST-584] add tests for CourseSidebarBlocksView

lms/djangoapps/course_home_api/outline/serializers.py

@@ -19,7 +19,8 @@ class CourseBlockSerializer(serializers.Serializer):
     def get_blocks(self, block):  # pylint: disable=missing-function-docstring
         block_key = block['id']
         block_type = block['type']
-        children = block.get('children', []) if block_type != 'sequential' else []  # Don't descend past sequential
+        last_parent_block_type = 'vertical' if self.context.get('include_vertical') else 'sequential'
+        children = block.get('children', []) if block_type != last_parent_block_type else []
         description = block.get('format')
         display_name = block['display_name']
         enable_links = self.context.get('enable_links')

lms/djangoapps/course_home_api/outline/tests/test_view.py

@@ -447,3 +447,236 @@ def test_cannot_enroll_if_full(self):
         self.update_course_and_overview()
         CourseEnrollment.enroll(UserFactory(), self.course.id)  # grr, some rando took our spot!
         self.assert_can_enroll(False)
+
+
+@ddt.ddt
+class SidebarBlocksTestViews(BaseCourseHomeTests):
+    """
+    Tests for the Course Sidebar Blocks API
+    """
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.chapter = ''
+        self.sequential = ''
+        self.vertical = ''
+        self.ungraded_sequential = ''
+        self.ungraded_vertical = ''
+        self.url = ''
+
+    def setUp(self):
+        super().setUp()
+        self.url = reverse('course-home:course-sidebar-blocks', args=[self.course.id])
+
+    def update_course_and_overview(self):
+        """
+        Update the course and course overview records.
+        """
+        self.update_course(self.course, self.user.id)
+        CourseOverview.load_from_module_store(self.course.id)
+
+    def add_blocks_to_course(self):
+        """
+        Add test blocks to the self course.
+        """
+        with self.store.bulk_operations(self.course.id):
+            self.chapter = BlockFactory.create(category='chapter', parent_location=self.course.location)
+            self.sequential = BlockFactory.create(
+                display_name='Test',
+                category='sequential',
+                graded=True,
+                has_score=True,
+                parent_location=self.chapter.location
+            )
+            self.vertical = BlockFactory.create(
+                category='problem',
+                graded=True,
+                has_score=True,
+                parent_location=self.sequential.location
+            )
+            self.ungraded_sequential = BlockFactory.create(
+                display_name='Ungraded',
+                category='sequential',
+                parent_location=self.chapter.location
+            )
+            self.ungraded_vertical = BlockFactory.create(
+                category='problem',
+                parent_location=self.ungraded_sequential.location
+            )
+        update_outline_from_modulestore(self.course.id)
+
+    @ddt.data(CourseMode.AUDIT, CourseMode.VERIFIED)
+    def test_get_authenticated_enrolled_user(self, enrollment_mode):
+        """
+        Test that the API returns the correct data for an authenticated, enrolled user.
+        """
+        self.add_blocks_to_course()
+        CourseEnrollment.enroll(self.user, self.course.id, enrollment_mode)
+
+        response = self.client.get(self.url)
+        assert response.status_code == 200
+
+        chapter_data = response.data['blocks'][str(self.chapter.location)]
+        assert str(self.sequential.location) in chapter_data['children']
+
+        sequential_data = response.data['blocks'][str(self.sequential.location)]
+        assert str(self.vertical.location) in sequential_data['children']
+
+        vertical_data = response.data['blocks'][str(self.vertical.location)]
+        assert vertical_data['children'] == []
+
+    @ddt.data(True, False)
+    def test_get_authenticated_user_not_enrolled(self, has_previously_enrolled):
+        """
+        Test that the API returns an empty response for an authenticated user who is not enrolled in the course.
+        """
+        if has_previously_enrolled:
+            CourseEnrollment.enroll(self.user, self.course.id)
+            CourseEnrollment.unenroll(self.user, self.course.id)
+
+        response = self.client.get(self.url)
+        assert response.status_code == 200
+        assert response.data == {}
+
+    def test_get_unauthenticated_user(self):
+        """
+        Test that the API returns an empty response for an unauthenticated user.
+        """
+        self.client.logout()
+        response = self.client.get(self.url)
+
+        assert response.status_code == 200
+        assert response.data.get('blocks') is None
+
+    def test_course_staff_can_see_non_user_specific_content_in_masquerade(self):
+        """
+        Test that course staff can see the outline and other non-user-specific content when masquerading as a learner
+        """
+        instructor = UserFactory(username='instructor', email='[email protected]', password='foo', is_staff=False)
+        CourseInstructorRole(self.course.id).add_users(instructor)
+        self.client.login(username=instructor, password='foo')
+        self.update_masquerade(role='student')
+        response = self.client.get(self.url)
+        assert response.data['blocks'] is not None
+
+    def test_get_unknown_course(self):
+        """
+        Test that the API returns a 404 when the course is not found.
+        """
+        url = reverse('course-home:course-sidebar-blocks', args=['course-v1:unknown+course+2T2020'])
+        response = self.client.get(url)
+        assert response.status_code == 404
+
+    @patch.dict('django.conf.settings.FEATURES', {'ENABLE_SPECIAL_EXAMS': True})
+    def test_proctored_exam(self):
+        """
+        Test that the API returns the correct data for a proctored exam.
+        """
+        course = CourseFactory.create(
+            org='edX',
+            course='900',
+            run='test_run',
+            enable_proctored_exams=True,
+            proctoring_provider=settings.PROCTORING_BACKENDS['DEFAULT'],
+        )
+        chapter = BlockFactory.create(parent=course, category='chapter', display_name='Test Section')
+        sequence = BlockFactory.create(
+            parent=chapter,
+            category='sequential',
+            display_name='Test Proctored Exam',
+            graded=True,
+            is_time_limited=True,
+            default_time_limit_minutes=10,
+            is_practice_exam=True,
+            due=datetime.now(),
+            exam_review_rules='allow_use_of_paper',
+            hide_after_due=False,
+            is_onboarding_exam=False,
+        )
+        sequence.is_proctored_exam = True
+        update_outline_from_modulestore(course.id)
+        CourseEnrollment.enroll(self.user, course.id)
+
+        url = reverse('course-home:course-sidebar-blocks', args=[course.id])
+        response = self.client.get(url)
+        assert response.status_code == 200
+
+        exam_data = response.data['blocks'][str(sequence.location)]
+        assert not exam_data['complete']
+        assert exam_data['display_name'] == 'Test Proctored Exam'
+        assert exam_data['due'] is not None
+
+    def test_assignment(self):
+        """
+        Test that the API returns the correct data for an assignment.
+        """
+        self.add_blocks_to_course()
+        CourseEnrollment.enroll(self.user, self.course.id)
+
+        response = self.client.get(self.url)
+        assert response.status_code == 200
+
+        exam_data = response.data['blocks'][str(self.sequential.location)]
+        assert exam_data['display_name'] == 'Test (1 Question)'
+        assert exam_data['icon'] == 'fa-pencil-square-o'
+        assert str(self.vertical.location) in exam_data['children']
+
+        ungraded_data = response.data['blocks'][str(self.ungraded_sequential.location)]
+        assert ungraded_data['display_name'] == 'Ungraded'
+        assert ungraded_data['icon'] is None
+        assert str(self.ungraded_vertical.location) in ungraded_data['children']
+
+    @override_waffle_flag(COURSE_ENABLE_UNENROLLED_ACCESS_FLAG, active=True)
+    @ddt.data(*itertools.product(
+        [True, False], [True, False], [None, COURSE_VISIBILITY_PUBLIC, COURSE_VISIBILITY_PUBLIC_OUTLINE]
+    ))
+    @ddt.unpack
+    def test_visibility(self, is_enrolled, is_staff, course_visibility):
+        """
+        Test that the API returns the correct data based on the user's enrollment status and the course's visibility.
+        """
+        if is_enrolled:
+            CourseEnrollment.enroll(self.user, self.course.id)
+        if is_staff:
+            self.user.is_staff = True
+            self.user.save()
+        if course_visibility:
+            self.course.course_visibility = course_visibility
+            self.update_course_and_overview()
+
+        show_enrolled = is_enrolled or is_staff
+        is_public = course_visibility == COURSE_VISIBILITY_PUBLIC
+        is_public_outline = course_visibility == COURSE_VISIBILITY_PUBLIC_OUTLINE
+
+        data = self.client.get(self.url).data
+        if not (show_enrolled or is_public or is_public_outline):
+            assert data == {}
+        else:
+            assert (data['blocks'] is not None) == (show_enrolled or is_public or is_public_outline)
+
+    def test_hide_learning_sequences(self):
+        """
+        Check that Learning Sequences filters out sequences.
+        """
+        CourseEnrollment.enroll(self.user, self.course.id, CourseMode.VERIFIED)
+        response = self.client.get(self.url)
+        assert response.status_code == 200
+
+        blocks = response.data['blocks']
+        seq_block_id = next(block_id for block_id, block in blocks.items() if block['type'] == 'sequential')
+
+        # With a course outline loaded, the same sequence is removed.
+        new_learning_seq_outline = CourseOutlineData(
+            course_key=self.course.id,
+            title='Test Course Outline!',
+            published_at=datetime(2021, 6, 14, tzinfo=timezone.utc),
+            published_version='5ebece4b69dd593d82fe2022',
+            entrance_exam_id=None,
+            days_early_for_beta=None,
+            sections=[],
+            self_paced=False,
+            course_visibility=CourseVisibility.PRIVATE
+        )
+        replace_course_outline(new_learning_seq_outline)
+        blocks = self.client.get(self.url).data['blocks']
+        assert seq_block_id not in blocks

lms/djangoapps/course_home_api/outline/views.py

@@ -28,6 +28,7 @@
 )
 from lms.djangoapps.course_goals.models import CourseGoal
 from lms.djangoapps.course_home_api.outline.serializers import (
+    CourseBlockSerializer,
     OutlineTabSerializer,
 )
 from lms.djangoapps.course_home_api.utils import get_course_or_403
@@ -375,6 +376,93 @@ def finalize_response(self, request, response, *args, **kwargs):
         return expose_header('Date', response)
 
 
+class CourseSidebarBlocksView(RetrieveAPIView):
+    """
+    **Use Cases**
+        Request details for the sidebar navigation of the course.
+    **Example Requests**
+        GET api/course_home/v1/sidebar/{course_key}
+    **Response Values**
+        For a good 200 response, the response will include:
+        blocks: List of serialized Course Block objects. Each serialization has the following fields:
+            id: (str) The usage ID of the block.
+            type: (str) The type of block. Possible values the names of any
+                XBlock type in the system, including custom blocks. Examples are
+                course, chapter, sequential, vertical, html, problem, video, and
+                discussion.
+            display_name: (str) The display name of the block.
+            lms_web_url: (str) The URL to the navigational container of the
+                xBlock on the web LMS.
+            children: (list) If the block has child blocks, a list of IDs of
+                the child blocks.
+            resume_block: (bool) Whether the block is the resume block
+            has_scheduled_content: (bool) Whether the block has more content scheduled for the future
+    **Returns**
+        * 200 on success.
+        * 403 if the user does not currently have access to the course and should be redirected.
+        * 404 if the course is not available or cannot be seen.
+    """
+
+    authentication_classes = (
+        JwtAuthentication,
+        BearerAuthenticationAllowInactiveUser,
+        SessionAuthenticationAllowInactiveUser,
+    )
+
+    serializer_class = CourseBlockSerializer
+
+    def get(self, request, *args, **kwargs):
+        """
+        Get the visible course blocks (from course to vertical types) for the given course.
+        """
+        course_key_string = kwargs.get('course_key_string')
+        course_key = CourseKey.from_string(course_key_string)
+        course = get_course_or_403(request.user, 'load', course_key, check_if_enrolled=False)
+
+        masquerade_object, request.user = setup_masquerade(
+            request,
+            course_key,
+            staff_access=has_access(request.user, 'staff', course_key),
+            reset_masquerade_data=True,
+        )
+
+        user_is_masquerading = is_masquerading(request.user, course_key, course_masquerade=masquerade_object)
+
+        enrollment = CourseEnrollment.get_enrollment(request.user, course_key)
+        allow_anonymous = COURSE_ENABLE_UNENROLLED_ACCESS_FLAG.is_enabled(course_key)
+        allow_public = allow_anonymous and course.course_visibility == COURSE_VISIBILITY_PUBLIC
+        allow_public_outline = allow_anonymous and course.course_visibility == COURSE_VISIBILITY_PUBLIC_OUTLINE
+        course_blocks = None
+
+        is_staff = bool(has_access(request.user, 'staff', course_key))
+        if getattr(enrollment, 'is_active', False) or is_staff:
+            course_blocks = get_course_outline_block_tree(request, course_key_string, request.user)
+        elif allow_public_outline or allow_public or user_is_masquerading:
+            course_blocks = get_course_outline_block_tree(request, course_key_string, None)
+
+        if course_blocks:
+            user_course_outline = get_user_course_outline(course_key, request.user, datetime.now(tz=timezone.utc))
+            available_section_ids = {str(section.usage_key) for section in user_course_outline.sections}
+            available_sequence_ids = {str(usage_key) for usage_key in user_course_outline.sequences}
+
+            course_blocks['children'] = [
+                chapter_data for chapter_data in course_blocks.get('children', [])
+                if chapter_data['id'] in available_section_ids
+            ]
+
+            for chapter_data in course_blocks['children']:
+                chapter_data['children'] = [
+                    seq_data for seq_data in chapter_data['children']
+                    if (seq_data['id'] in available_sequence_ids or seq_data['type'] != 'sequential')
+                ] if 'children' in chapter_data else []
+
+        context = self.get_serializer_context()
+        context['include_vertical'] = True
+        serializer = self.get_serializer_class()(course_blocks, context=context)
+
+        return Response(serializer.data)
+
+
 @api_view(['POST'])
 @permission_classes((IsAuthenticated,))
 def dismiss_welcome_message(request):  # pylint: disable=missing-function-docstring

lms/djangoapps/course_home_api/urls.py

@@ -9,7 +9,11 @@
 from lms.djangoapps.course_home_api.course_metadata.views import CourseHomeMetadataView
 from lms.djangoapps.course_home_api.dates.views import DatesTabView
 from lms.djangoapps.course_home_api.outline.views import (
-    OutlineTabView, dismiss_welcome_message, save_course_goal, unsubscribe_from_course_goal_by_token,
+    CourseSidebarBlocksView,
+    OutlineTabView,
+    dismiss_welcome_message,
+    save_course_goal,
+    unsubscribe_from_course_goal_by_token,
 )
 from lms.djangoapps.course_home_api.progress.views import ProgressTabView
 
@@ -44,6 +48,11 @@
         OutlineTabView.as_view(),
         name='outline-tab'
     ),
+    re_path(
+        fr'sidebar/{settings.COURSE_KEY_PATTERN}',
+        CourseSidebarBlocksView.as_view(),
+        name='course-sidebar-blocks'
+    ),
     re_path(
         r'dismiss_welcome_message',
         dismiss_welcome_message,