feat: add a POST endpoint for listing courses (#35586)

* feat: add a POST endpoint for listing courses

docs/lms-openapi.yaml

@@ -2623,6 +2623,7 @@ paths:
         **Example Requests**
 
             GET /api/courses/v1/courses/
+            POST /api/courses/v1/courses/
 
         **Response Values**
 
@@ -2698,6 +2699,10 @@ paths:
                     "start_type": "timestamp"
                   }
                 ]
+        **Note**
+
+            The POST /api/courses/v1/courses/ reads `request.body` for parameters, allowing for
+            larger input than the query string.
       parameters:
       - name: page
         in: query

lms/djangoapps/course_api/tests/test_views.py

@@ -250,6 +250,18 @@ class CourseListViewTestCaseMultipleCourses(CourseApiTestViewMixin, ModuleStoreT
         ids = {c['course_id'] for c in response.json()['results']}
         self.assertEqual(ids, {str(self.course.id)})
 
+    def test_filter_post(self):
+        """Verify that CourseOverviews are filtered by the provided org key in a POST request."""
+        self.setup_user(self.staff_user)
+
+        # Create a second course to be filtered out of queries.
+        alternate_course = self.create_course(
+            org=md5(self.course.org.encode('utf-8')).hexdigest()
+        )
+
+        response = self.client.post(self.url, data={'course_keys': str(self.course.id)})
+        assert all((course['org'] == self.course.org) for course in response.json()['results'])
+
 
 class CourseDetailViewTestCase(CourseApiTestViewMixin, SharedModuleStoreTestCase):
     """

lms/djangoapps/course_api/views.py

@@ -254,6 +254,7 @@ class CourseListView(DeveloperErrorViewMixin, ListAPIView):
     **Example Requests**
 
         GET /api/courses/v1/courses/
+        POST /api/courses/v1/courses/
 
     **Response Values**
 
@@ -329,6 +330,10 @@ class CourseListView(DeveloperErrorViewMixin, ListAPIView):
                 "start_type": "timestamp"
               }
             ]
+    **Note**
+
+        The POST /api/courses/v1/courses/ reads `request.body` for parameters, allowing for
+        larger input than the query string.
     """
     class CourseListPageNumberPagination(LazyPageNumberPagination):
         max_page_size = 100
@@ -341,7 +346,13 @@ class CourseListView(DeveloperErrorViewMixin, ListAPIView):
         """
         Yield courses visible to the user.
         """
-        form = CourseListGetForm(self.request.query_params, initial={'requesting_user': self.request.user})
+        form_data = self.request.query_params
+        if self.request.method == 'POST':
+            form_data = self.request.data
+        form = CourseListGetForm(
+            data=form_data,
+            initial={'requesting_user': self.request.user}
+        )
         if not form.is_valid():
             raise ValidationError(form.errors)
         return list_courses(
@@ -356,6 +367,12 @@ class CourseListView(DeveloperErrorViewMixin, ListAPIView):
             mobile_search=form.cleaned_data.get('mobile_search', False),
         )
 
+    def post(self, request, *args, **kwargs):
+        """
+        POST courses filter.
+        """
+        return self.list(request, *args, **kwargs)
+
 
 class CourseIdListUserThrottle(UserRateThrottle):
     """Limit the number of requests users can make to the course list id API."""