Implement public cohort

This PR is based on #19284 and is part of the
series of work related to the proposal #18134.

This PR avoids the assignment of
anonymous/unenrolled users to any cohort when
course is public. Anonymous or unenrolled users
will only see content that does not have a
content group assigned.
The "View Course" link to the course outline
is shown on the course about page for a course
marked public/public outline.
It also makes course handouts available for
public courses (not for public_outline).
This PR also hides the different warnings and
messages asking the user to sign-in and enroll
in the course, when the course is marked public.
It modifies the default public_view text to
include the component display_name when
unenrolled access is not available.

openedx/core/djangoapps/course_groups/tests/test_cohorts.py

@@ -391,6 +391,10 @@ class TestCohorts(ModuleStoreTestCase):
         Anonymous user is not assigned to any cohort group.
         """
         course = modulestore().get_course(self.toy_course_key)
+
+        # verify cohorts is None when course is not cohorted
+        self.assertIsNone(cohorts.get_cohort(AnonymousUser(), course.id))
+
         config_course_cohorts(
             course,
             is_cohorted=True,

openedx/features/course_experience/tests/views/test_course_home.py

@@ -313,12 +313,13 @@ class TestCourseHomePageAccess(CourseHomePageTestCase):
         self.assertContains(response, TEST_CHAPTER_NAME, count=(1 if expected_course_outline else 0))
 
         # Verify that the expected message is shown to the user
-        self.assertContains(
-            response, 'To see course content', count=(1 if is_anonymous else 0)
-        )
-        self.assertContains(response, '<div class="user-messages"', count=(1 if expected_enroll_message else 0))
-        if expected_enroll_message:
-            self.assertContains(response, 'You must be enrolled in the course to see course content.')
+        if not enable_unenrolled_access or course_visibility != COURSE_VISIBILITY_PUBLIC:
+            self.assertContains(
+                response, 'To see course content', count=(1 if is_anonymous else 0)
+            )
+            self.assertContains(response, '<div class="user-messages"', count=(1 if expected_enroll_message else 0))
+            if expected_enroll_message:
+                self.assertContains(response, 'You must be enrolled in the course to see course content.')
 
     @override_waffle_flag(UNIFIED_COURSE_TAB_FLAG, active=False)
     @override_waffle_flag(SHOW_REVIEWS_TOOL_FLAG, active=True)

openedx/features/course_experience/views/course_home.py

@@ -163,6 +163,8 @@ class CourseHomeFragmentView(EdxFragmentView):
                 request, course_id=course_id, user_is_enrolled=False, **kwargs
             )
             course_sock_fragment = CourseSockFragmentView().render_to_fragment(request, course=course, **kwargs)
+            if allow_public:
+                handouts_html = self._get_course_handouts(request, course)
         else:
             # Redirect the user to the dashboard if they are not enrolled and
             # this is a course that does not support direct enrollment.

openedx/features/course_experience/views/course_home_messages.py

@@ -130,8 +130,8 @@ def _register_course_home_messages(request, course, user_access, course_start_da
             Text(_(
                 '{open_enroll_link}Enroll now{close_enroll_link} to access the full course.'
             )).format(
-                open_enroll_link='',
-                close_enroll_link=''
+                open_enroll_link=HTML('<button class="enroll-btn btn-link">'),
+                close_enroll_link=HTML('</button>')
             ),
             title=Text(_('Welcome to {course_display_name}')).format(
                 course_display_name=course.display_name