51 lines
1.8 KiB
Go
51 lines
1.8 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package identity
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import (
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"bytes"
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"fmt"
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"k8s.io/apiserver/pkg/storage/value"
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)
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// identityTransformer performs no transformation on provided data, but validates
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// that the data is not encrypted data during TransformFromStorage
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type identityTransformer struct{}
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// NewEncryptCheckTransformer returns an identityTransformer which returns an error
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// on attempts to read encrypted data
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func NewEncryptCheckTransformer() value.Transformer {
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return identityTransformer{}
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}
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// TransformFromStorage returns the input bytes if the data is not encrypted
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func (identityTransformer) TransformFromStorage(b []byte, context value.Context) ([]byte, bool, error) {
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// identityTransformer has to return an error if the data is encoded using another transformer.
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// JSON data starts with '{'. Protobuf data has a prefix 'k8s[\x00-\xFF]'.
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// Prefix 'k8s:enc:' is reserved for encrypted data on disk.
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if bytes.HasPrefix(b, []byte("k8s:enc:")) {
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return []byte{}, false, fmt.Errorf("identity transformer tried to read encrypted data")
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}
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return b, false, nil
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}
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// TransformToStorage implements the Transformer interface for identityTransformer
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func (identityTransformer) TransformToStorage(b []byte, context value.Context) ([]byte, error) {
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return b, nil
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}
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