Merge pull request #11286 from open-craft/omar/remove-s3

Add OpenStack Swift support

openedx/core/storage.py

@@ -3,6 +3,9 @@ Django storage backends for Open edX.
 """
 from django_pipeline_forgiving.storages import PipelineForgivingStorage
 from django.contrib.staticfiles.storage import StaticFilesStorage
+from django.core.files.storage import get_storage_class
+from django.utils.lru_cache import lru_cache
+
 from pipeline.storage import NonPackagingMixin
 from require.storage import OptimizedFilesMixin
 from openedx.core.djangoapps.theming.storage import (
@@ -39,3 +42,16 @@ class DevelopmentStorage(
     so that we can skip packaging and optimization.
     """
     pass
+
+
+@lru_cache()
+def get_storage(storage_class=None, **kwargs):
+    """
+    Returns a storage instance with the given class name and kwargs. If the
+    class name is not given, an instance of the default storage is returned.
+    Instances are cached so that if this function is called multiple times
+    with the same arguments, the same instance is returned. This is useful if
+    the storage implementation makes http requests when instantiated, for
+    example.
+    """
+    return get_storage_class(storage_class)(**kwargs)