feat: add course optimizer waffle flag (#35884)

Description
Add a waffle flag to toggle on or off the new Course Optimizer feature per course.

Impact
Course Author

Context
Course Optimizer is a much-requested feature that has been aligned with the OpenEdx community. The only component for now is a broken link checker that will return a list of all broken links in a course to the frontend. There will be a new page for this that is a bit similar to the export page.

This PR only deals with adding a waffle flag.

Supporting information
Internal Ticket (2U):
https://2u-internal.atlassian.net/browse/TNL-11808

cms/djangoapps/contentstore/rest_api/v1/serializers/course_waffle_flags.py

@@ -27,6 +27,7 @@ class CourseWaffleFlagsSerializer(serializers.Serializer):
     use_new_certificates_page = serializers.SerializerMethodField()
     use_new_textbooks_page = serializers.SerializerMethodField()
     use_new_group_configurations_page = serializers.SerializerMethodField()
+    enable_course_optimizer = serializers.SerializerMethodField()
 
     def get_course_key(self):
         """
@@ -144,3 +145,10 @@ class CourseWaffleFlagsSerializer(serializers.Serializer):
         """
         course_key = self.get_course_key()
         return toggles.use_new_group_configurations_page(course_key)
+
+    def get_enable_course_optimizer(self, obj):
+        """
+        Method to get the enable_course_optimizer waffle flag
+        """
+        course_key = self.get_course_key()
+        return toggles.enable_course_optimizer(course_key)

cms/djangoapps/contentstore/rest_api/v1/views/tests/test_course_waffle_flags.py

@@ -36,6 +36,8 @@ class CourseWaffleFlagsViewTest(CourseTestCase):
         "use_new_group_configurations_page",
     ]
 
+    other_expected_waffle_flags = ["enable_course_optimizer"]
+
     def setUp(self):
         """
         Set up test data and state before each test method.
@@ -46,6 +48,18 @@ class CourseWaffleFlagsViewTest(CourseTestCase):
         super().setUp()
         self.url = reverse("cms.djangoapps.contentstore:v1:course_waffle_flags")
         self.create_waffle_flags(self.course_waffle_flags)
+        self.create_custom_waffle_flags()
+
+    def create_custom_waffle_flags(self, enabled=True):
+        """
+        Helper method to create waffle flags that are not part of `course_waffle_flags` and have
+        a different format.
+        """
+        WaffleFlagCourseOverrideModel.objects.create(
+            waffle_flag="contentstore.enable_course_optimizer",
+            course_id=self.course.id,
+            enabled=enabled,
+        )
 
     def create_waffle_flags(self, flags, enabled=True):
         """
@@ -72,7 +86,10 @@ class CourseWaffleFlagsViewTest(CourseTestCase):
         Returns:
             dict: A dictionary with each flag set to the value of `enabled`.
         """
-        return {flag: enabled for flag in self.course_waffle_flags}
+        res = {flag: enabled for flag in self.course_waffle_flags}
+        for flag in self.other_expected_waffle_flags:
+            res[flag] = enabled
+        return res
 
     def test_get_course_waffle_flags_with_course_id(self):
         """

cms/djangoapps/contentstore/toggles.py

@@ -667,3 +667,23 @@ def libraries_v2_enabled():
         search_api.is_meilisearch_enabled() and
         not DISABLE_NEW_LIBRARIES.is_enabled()
     )
+
+
+# .. toggle_name: contentstore.enable_course_optimizer
+# .. toggle_implementation: CourseWaffleFlag
+# .. toggle_default: False
+# .. toggle_description: This flag enables the use of unique anonymous_user_id during studio preview
+# .. toggle_use_cases: temporary
+# .. toggle_creation_date: 2022-05-04
+# .. toggle_target_removal_date: 2022-05-30
+# .. toggle_tickets: MST-1455
+ENABLE_COURSE_OPTIMIZER = CourseWaffleFlag(
+    f'{CONTENTSTORE_NAMESPACE}.enable_course_optimizer', __name__
+)
+
+
+def enable_course_optimizer(course_id):
+    """
+    Returns a boolean if individualized anonymous_user_id is enabled on the course
+    """
+    return ENABLE_COURSE_OPTIMIZER.is_enabled(course_id)