Support django-storages >=1.14

private_storage/storage/s3boto3.py

@@ -16,8 +16,8 @@ class PrivateS3BotoStorage(S3Boto3Storage):
     Private storage bucket for S3
     """
 
-    access_key_names = ['AWS_PRIVATE_S3_ACCESS_KEY_ID', 'AWS_PRIVATE_ACCESS_KEY_ID'] + S3Boto3Storage.access_key_names
-    secret_key_names = ['AWS_PRIVATE_S3_SECRET_ACCESS_KEY', 'AWS_PRIVATE_SECRET_ACCESS_KEY'] + S3Boto3Storage.secret_key_names
+    access_key_names = ['AWS_PRIVATE_S3_ACCESS_KEY_ID', 'AWS_PRIVATE_ACCESS_KEY_ID'] + getattr(S3Boto3Storage, 'access_key_names', [])
+    secret_key_names = ['AWS_PRIVATE_S3_SECRET_ACCESS_KEY', 'AWS_PRIVATE_SECRET_ACCESS_KEY'] + getattr(S3Boto3Storage, 'secret_key_names', [])
 
     def __init__(self, **settings):
         super().__init__(**settings)