| /* |
| Copyright 2017 The Kubernetes Authors. |
| |
| 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 identity |
| |
| import ( |
| "bytes" |
| "fmt" |
| |
| "k8s.io/apiserver/pkg/storage/value" |
| ) |
| |
| // identityTransformer performs no transformation on provided data, but validates |
| // that the data is not encrypted data during TransformFromStorage |
| type identityTransformer struct{} |
| |
| // NewEncryptCheckTransformer returns an identityTransformer which returns an error |
| // on attempts to read encrypted data |
| func NewEncryptCheckTransformer() value.Transformer { |
| return identityTransformer{} |
| } |
| |
| // TransformFromStorage returns the input bytes if the data is not encrypted |
| func (identityTransformer) TransformFromStorage(b []byte, context value.Context) ([]byte, bool, error) { |
| // identityTransformer has to return an error if the data is encoded using another transformer. |
| // JSON data starts with '{'. Protobuf data has a prefix 'k8s[\x00-\xFF]'. |
| // Prefix 'k8s:enc:' is reserved for encrypted data on disk. |
| if bytes.HasPrefix(b, []byte("k8s:enc:")) { |
| return []byte{}, false, fmt.Errorf("identity transformer tried to read encrypted data") |
| } |
| return b, false, nil |
| } |
| |
| // TransformToStorage implements the Transformer interface for identityTransformer |
| func (identityTransformer) TransformToStorage(b []byte, context value.Context) ([]byte, error) { |
| return b, nil |
| } |