feat: update file storage access to support Django 5.0 storages registry

cms/djangoapps/export_course_metadata/storage.py

@@ -4,7 +4,7 @@ Storage backend for course metadata export.
 
 
 from django.conf import settings
-from django.core.files.storage import get_storage_class
+from common.djangoapps.util.storage import resolve_storage_backend
 from storages.backends.s3boto3 import S3Boto3Storage
 
 
@@ -17,4 +17,4 @@ class CourseMetadataExportS3Storage(S3Boto3Storage):  # pylint: disable=abstract
         bucket = settings.COURSE_METADATA_EXPORT_BUCKET
         super().__init__(bucket_name=bucket, custom_domain=None, querystring_auth=True)
 
-course_metadata_export_storage = get_storage_class(settings.COURSE_METADATA_EXPORT_STORAGE)()
+course_metadata_export_storage = resolve_storage_backend("COURSE_METADATA_EXPORT_STORAGE")

common/djangoapps/util/storage.py

@@ -0,0 +1,47 @@
+""" Utility functions related to django storages """
+
+import django
+from django.conf import settings
+from django.core.files.storage import default_storage
+from django.utils.module_loading import import_string
+
+
+if django.VERSION >= (5, 0):
+    from django.core.files.storage import storages
+
+
+def resolve_storage_backend(storage_key, options={}):
+    storage_path = getattr(settings, storage_key)
+    storages_config = getattr(settings, 'STORAGES', {})
+
+    if storage_key == "default":
+        # Use case 1: Default storage
+        # Works consistently across Django 4.2 and 5.x
+        # In Django 4.2, default_storage uses DEFAULT_FILE_STORAGE
+        # In Django 5.x, it uses STORAGES['default']
+        return default_storage
+
+    if django.VERSION >= (5, 0) and storage_key in storages_config:
+        # Use case 2: Django 5+ with STORAGES defined
+        # settings.py must define STORAGES like:
+        # STORAGES = {
+        #     "default": {"BACKEND": "...", "OPTIONS": {...}},
+        #     "custom": {"BACKEND": "...", "OPTIONS": {...}},
+        # }
+        # See: https://docs.djangoproject.com/en/5.2/ref/settings/#std-setting-STORAGES
+        return storages[storage_key]
+
+    if not storage_path and storage_key in storages_config:
+        # Use case 3: Transitional setup
+        # Running on Django 4.x but using Django 5-style STORAGES config
+        # Manually load the backend and options
+        storage_path = storages_config.get(storage_key, {}).get("BACKEND")
+        options = storages_config.get(storage_key, {}).get("OPTIONS", {})
+    
+    if not storage_path:
+        # if no specific storage was resolved, use the default storage
+        return default_storage
+
+    # Fallback to import the storage_path manually
+    StorageClass = import_string(storage_path)
+    return StorageClass(**options)