fix: when redirecting to the MFE, preserve query flags

This can potentially fix analytics based on query params like
utm_campaign and the like. And generally seems like the correct
thing to do.

AA-1128

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

@@ -227,6 +227,15 @@ class TestCourseHomePage(CourseHomePageTestCase):  # lint-amnesty, pylint: disab
             response = self.client.get(url)
             assert response.status_code == 200
 
+    def test_legacy_redirect(self):
+        """
+        Verify that the legacy course home page redirects to the MFE correctly.
+        """
+        url = course_home_url(self.course) + '?foo=b$r'
+        response = self.client.get(url)
+        assert response.status_code == 302
+        assert response.get('Location') == 'http://learning-mfe/course/course-v1:edX+test+Test_Course/home?foo=b%24r'
+
 
 @ddt.ddt
 class TestCourseHomePageAccess(CourseHomePageTestCase):

openedx/features/course_experience/url_helpers.py

@@ -7,10 +7,10 @@ because the Studio course outline may need these utilities.
 from enum import Enum
 from typing import Optional
 
-import six  # lint-amnesty, pylint: disable=unused-import
 from django.conf import settings
 from django.contrib.auth import get_user_model
 from django.http import HttpRequest
+from django.http.request import QueryDict
 from django.urls import reverse
 from opaque_keys.edx.keys import CourseKey, UsageKey
 from six.moves.urllib.parse import urlencode, urlparse
@@ -148,6 +148,7 @@ def make_learning_mfe_courseware_url(
         course_key: CourseKey,
         sequence_key: Optional[UsageKey] = None,
         unit_key: Optional[UsageKey] = None,
+        params: Optional[QueryDict] = None,
 ) -> str:
     """
     Return a str with the URL for the specified courseware content in the Learning MFE.
@@ -176,6 +177,7 @@ def make_learning_mfe_courseware_url(
 
     `course_key`, `sequence_key`, and `unit_key` can be either OpaqueKeys or
     strings. They're only ever used to concatenate a URL string.
+    `params` is an optional QueryDict object (e.g. request.GET)
     """
     mfe_link = f'{settings.LEARNING_MICROFRONTEND_URL}/course/{course_key}'
 
@@ -185,11 +187,16 @@ def make_learning_mfe_courseware_url(
         if unit_key:
             mfe_link += f'/{unit_key}'
 
+    if params:
+        mfe_link += f'?{params.urlencode()}'
+
     return mfe_link
 
 
 def get_learning_mfe_home_url(
-        course_key: CourseKey, view_name: Optional[str] = None
+        course_key: CourseKey,
+        view_name: Optional[str] = None,
+        params: Optional[QueryDict] = None,
 ) -> str:
     """
     Given a course run key and view name, return the appropriate course home (MFE) URL.
@@ -200,12 +207,16 @@ def get_learning_mfe_home_url(
 
     `course_key` can be either an OpaqueKey or a string.
     `view_name` is an optional string.
+    `params` is an optional QueryDict object (e.g. request.GET)
     """
     mfe_link = f'{settings.LEARNING_MICROFRONTEND_URL}/course/{course_key}'
 
     if view_name:
         mfe_link += f'/{view_name}'
 
+    if params:
+        mfe_link += f'?{params.urlencode()}'
+
     return mfe_link
 
 

openedx/features/course_experience/views/course_home.py

@@ -70,7 +70,7 @@ class CourseHomeView(CourseTabView):
         if course_home_legacy_is_active(course.id) or request.user.is_staff:
             home_fragment_view = CourseHomeFragmentView()
             return home_fragment_view.render_to_fragment(request, course_id=course_id, **kwargs)
-        microfrontend_url = get_learning_mfe_home_url(course_key=course_id, view_name="home")
+        microfrontend_url = get_learning_mfe_home_url(course_key=course_id, view_name='home', params=request.GET)
         raise Redirect(microfrontend_url)
 
 

openedx/features/learner_profile/views/learner_profile.py

@@ -45,6 +45,8 @@ def learner_profile(request, username):
     """
     if should_redirect_to_profile_microfrontend():
         profile_microfrontend_url = f"{settings.PROFILE_MICROFRONTEND_URL}{username}"
+        if request.GET:
+            profile_microfrontend_url += f'?{request.GET.urlencode()}'
         return redirect(profile_microfrontend_url)
 
     try: