fix: support Learning MFE hosted on subpath.

The Referrer header from the MFE hosted on a different origin does not
include the path, so make sure to ignore the path portion of the
learning MFE base URL when determining whether the request is coming
from the new MFE or the old courseware view.

openedx/features/course_experience/tests/test_url_helpers.py

@@ -4,6 +4,9 @@ Test some of the functions in url_helpers
 from unittest import mock
 
 import ddt
+from django.test import TestCase
+from django.test.client import RequestFactory
+from django.test.utils import override_settings
 
 from xmodule.modulestore import ModuleStoreEnum
 from xmodule.modulestore.tests.django_utils import SharedModuleStoreTestCase
@@ -20,6 +23,33 @@ def _patch_courseware_mfe_is_active(ret_val):
     )
 
 
+@ddt.ddt
+class IsLearningMfeTests(TestCase):
+    """
+    Test is_request_from_learning_mfe.
+    """
+
+    def setUp(self):
+        super().setUp()
+        self.request_factory = RequestFactory()
+
+    @ddt.data(
+        ('', '', False,),
+        ('https://mfe-url/', 'https://platform-url/course', False,),
+        ('https://mfe-url/', 'https://mfe-url/course', True,),
+        ('https://mfe-url/', 'https://mfe-url/', True,),
+        ('https://mfe-url/subpath/', 'https://platform-url/course', False,),
+        ('https://mfe-url/subpath/', 'https://mfe-url/course', True,),
+        ('https://mfe-url/subpath/', 'https://mfe-url/', True,),
+    )
+    @ddt.unpack
+    def test_is_request_from_learning_mfe(self, mfe_url, referrer_url, is_mfe):
+        with override_settings(LEARNING_MICROFRONTEND_URL=mfe_url):
+            request = self.request_factory.get('/course')
+            request.META['HTTP_REFERER'] = referrer_url
+            assert url_helpers.is_request_from_learning_mfe(request) == is_mfe
+
+
 @ddt.ddt
 class GetCoursewareUrlTests(SharedModuleStoreTestCase):
     """

openedx/features/course_experience/url_helpers.py

@@ -13,7 +13,7 @@ from django.contrib.auth import get_user_model
 from django.http import HttpRequest
 from django.urls import reverse
 from opaque_keys.edx.keys import CourseKey, UsageKey
-from six.moves.urllib.parse import urlencode
+from six.moves.urllib.parse import urlencode, urlparse
 
 from lms.djangoapps.courseware.toggles import courseware_mfe_is_active
 from xmodule.modulestore.django import modulestore
@@ -213,7 +213,9 @@ def is_request_from_learning_mfe(request: HttpRequest):
     """
     Returns whether the given request was made by the frontend-app-learning MFE.
     """
-    return (
-        settings.LEARNING_MICROFRONTEND_URL and
-        request.META.get('HTTP_REFERER', '').startswith(settings.LEARNING_MICROFRONTEND_URL)
-    )
+    if not settings.LEARNING_MICROFRONTEND_URL:
+        return False
+
+    url = urlparse(settings.LEARNING_MICROFRONTEND_URL)
+    mfe_url_base = f'{url.scheme}://{url.netloc}'
+    return request.META.get('HTTP_REFERER', '').startswith(mfe_url_base)