feat: set course for wiki based on the wiki_slug

lms/djangoapps/course_wiki/middleware.py

@@ -15,6 +15,8 @@
 from openedx.features.enterprise_support.api import get_enterprise_consent_url
 from common.djangoapps.student.models import CourseEnrollment
 
+from xmodule import modulestore
+
 
 class WikiAccessMiddleware(MiddlewareMixin):
     """
@@ -55,6 +57,21 @@ def process_view(self, request, view_func, view_args, view_kwargs):  # lint-amne
         course_id = course_id_from_url(request.path)
         wiki_path = request.path.partition('/wiki/')[2]
 
+        # if no wiki_path, can't get wiki_slug, so no point trying to look up
+        # course_id by wiki_slug
+        if not course_id and wiki_path:
+            # wiki path always starts with wiki_slug
+            wiki_slug = wiki_path.split('/')[0]
+
+            modstore = modulestore.django.modulestore()
+            course_ids = modstore.get_courses_for_wiki(wiki_slug)
+            # the above can return multiple courses, and to avoid ambiguity and
+            # avoid pointing to wrong courses, we only set course_id if we've
+            # got an exact match, i.e. only one course was returned for a
+            # wiki_slug
+            if len(course_ids) == 1:
+                course_id = course_ids[0]
+
         if course_id:
             # This is a /courses/org/name/run/wiki request
             course_path = f"/courses/{str(course_id)}"

lms/djangoapps/course_wiki/tests/test_middleware.py

@@ -34,3 +34,10 @@ def test_url_tranform(self):
         response = self.client.get('/courses/edx/math101/2014/wiki/math101/')
         self.assertContains(response, '/courses/edx/math101/2014/wiki/math101/_edit/')
         self.assertContains(response, '/courses/edx/math101/2014/wiki/math101/_settings/')
+
+    def test_finds_course_by_wiki_slug(self):
+        """Test that finds course by wiki slug, if course id is not present in the url."""
+        response = self.client.get('/wiki/math101/')
+        request = response.wsgi_request
+        self.assertTrue(hasattr(request, 'course'))
+        self.assertEqual(request.course.id, self.course_math101.id)