Refactor the storage provider interface.

storage/storage.go

@@ -0,0 +1,28 @@
+// Copyright 2021 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+
+import "github.com/qor/oss"
+
+func GetStorageProvider(providerType string, clientId string, clientSecret string, region string, bucket string, endpoint string) oss.StorageInterface {
+	switch providerType {
+	case "AWS S3":
+		return NewAwsS3StorageProvider(clientId, clientSecret, region, bucket, endpoint)
+	case "Aliyun OSS":
+		return NewAliyunStorageProvider(clientId, clientSecret, region, bucket, endpoint)
+	}
+
+	return nil
+}