diff --git a/casdoor/permission_adapter.go b/casdoor/permission.go
similarity index 100%
rename from casdoor/permission_adapter.go
rename to casdoor/permission.go
diff --git a/casdoor/resource_adaptor.go b/casdoor/resource.go
similarity index 61%
rename from casdoor/resource_adaptor.go
rename to casdoor/resource.go
index 6ad2cce..9b73ce8 100644
--- a/casdoor/resource_adaptor.go
+++ b/casdoor/resource.go
@@ -1,3 +1,17 @@
+// Copyright 2023 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 casdoor
 
 import (
diff --git a/storage/aliyun.go b/storage/aliyun.go
deleted file mode 100644
index d8ec4fd..0000000
--- a/storage/aliyun.go
+++ /dev/null
@@ -1,91 +0,0 @@
-// Copyright 2023 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 (
-	"bytes"
-	"fmt"
-
-	"github.com/aliyun/aliyun-oss-go-sdk/oss"
-)
-
-func getBucket(bucketName string) (*oss.Bucket, error) {
-	client, err := oss.New(endpoint, clientId, clientSecret)
-	if err != nil {
-		panic(err)
-	}
-
-	bucket, err := client.Bucket(bucketName)
-	if err != nil {
-		return nil, err
-	}
-
-	return bucket, nil
-}
-
-func ListObjects(bucketName string, prefix string) ([]oss.ObjectProperties, error) {
-	if bucketName == "" {
-		return nil, fmt.Errorf("bucket name is empty")
-	}
-
-	bucket, err := getBucket(bucketName)
-	if err != nil {
-		return nil, err
-	}
-
-	res := []oss.ObjectProperties{}
-	marker := oss.Marker("")
-	i := 0
-	for {
-		resp, err := bucket.ListObjects(oss.Prefix(prefix), oss.MaxKeys(1000), marker)
-		if err != nil {
-			return nil, err
-		}
-
-		marker = oss.Marker(resp.NextMarker)
-
-		for _, object := range resp.Objects {
-			res = append(res, object)
-			// fmt.Printf("[%d] %s\n", i, object.Key)
-			i += 1
-		}
-
-		if !resp.IsTruncated {
-			break
-		}
-	}
-
-	return res, nil
-}
-
-func PutObject(bucketName string, key string, fileBuffer *bytes.Buffer) error {
-	bucket, err := getBucket(bucketName)
-	if err != nil {
-		return err
-	}
-
-	err = bucket.PutObject(key, fileBuffer)
-	return err
-}
-
-func DeleteObject(bucketName string, key string) error {
-	bucket, err := getBucket(bucketName)
-	if err != nil {
-		return err
-	}
-
-	err = bucket.DeleteObject(key)
-	return err
-}
diff --git a/storage/casdoor.go b/storage/casdoor.go
index 3439fc0..6b34bae 100644
--- a/storage/casdoor.go
+++ b/storage/casdoor.go
@@ -1,3 +1,17 @@
+// Copyright 2023 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 (
diff --git a/storage/storage.go b/storage/storage.go
index d82d16c..15b465e 100644
--- a/storage/storage.go
+++ b/storage/storage.go
@@ -1,3 +1,17 @@
+// Copyright 2023 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 (