Add support for Google Cloud Storage.

storage/__init__.py

@@ -1,9 +1,16 @@
 from storage.local import LocalStorage
-from storage.s3 import S3Storage
+from storage.cloud import S3Storage, GoogleCloudStorage
 from storage.fakestorage import FakeStorage
 from storage.distributedstorage import DistributedStorage
 
 
+STORAGE_DRIVER_CLASSES = {
+  'LocalStorage': LocalStorage,
+  'S3Storage': S3Storage,
+  'GoogleCloudStorage': GoogleCloudStorage,
+}
+
+
 class Storage(object):
   def __init__(self, app=None):
     self.app = app
@@ -18,13 +25,8 @@ class Storage(object):
       driver = storage_params[0]
       parameters = storage_params[1]
 
-      if driver == 'LocalStorage':
-        storage = LocalStorage(**parameters)
-      elif driver == 'S3Storage':
-        storage = S3Storage(**parameters)
-      else:
-        storage = FakeStorage()
-
+      driver_class = STORAGE_DRIVER_CLASSES.get(driver, FakeStorage)
+      storage = driver_class(**parameters)
       storages[location] = storage
 
     preference = app.config.get('DISTRIBUTED_STORAGE_PREFERENCE', None)