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86 lines
2.1 KiB
86 lines
2.1 KiB
/*
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Copyright The Helm 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 driver // import "helm.sh/helm/v3/pkg/storage/driver"
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import (
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"bytes"
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"compress/gzip"
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"encoding/base64"
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"encoding/json"
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"io"
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rspb "helm.sh/helm/v3/pkg/release"
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)
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var b64 = base64.StdEncoding
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var magicGzip = []byte{0x1f, 0x8b, 0x08}
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// encodeRelease encodes a release returning a base64 encoded
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// gzipped string representation, or error.
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func encodeRelease(rls *rspb.Release) (string, error) {
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b, err := json.Marshal(rls)
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if err != nil {
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return "", err
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}
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var buf bytes.Buffer
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w, err := gzip.NewWriterLevel(&buf, gzip.BestCompression)
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if err != nil {
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return "", err
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}
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if _, err = w.Write(b); err != nil {
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return "", err
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}
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w.Close()
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return b64.EncodeToString(buf.Bytes()), nil
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}
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// decodeRelease decodes the bytes of data into a release
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// type. Data must contain a base64 encoded gzipped string of a
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// valid release, otherwise an error is returned.
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func decodeRelease(data string) (*rspb.Release, error) {
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// base64 decode string
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b, err := b64.DecodeString(data)
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if err != nil {
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return nil, err
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}
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// For backwards compatibility with releases that were stored before
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// compression was introduced we skip decompression if the
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// gzip magic header is not found
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if len(b) > 3 && bytes.Equal(b[0:3], magicGzip) {
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r, err := gzip.NewReader(bytes.NewReader(b))
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if err != nil {
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return nil, err
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}
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defer r.Close()
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b2, err := io.ReadAll(r)
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if err != nil {
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return nil, err
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}
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b = b2
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}
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var rls rspb.Release
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// unmarshal release object bytes
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if err := json.Unmarshal(b, &rls); err != nil {
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return nil, err
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}
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return &rls, nil
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}
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