mirror of
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62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
// Copyright 2018 Google LLC All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package v1util
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import (
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"encoding/hex"
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"fmt"
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"hash"
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"io"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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)
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type verifyReader struct {
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inner io.Reader
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hasher hash.Hash
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expected v1.Hash
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}
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// Read implements io.Reader
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func (vc *verifyReader) Read(b []byte) (int, error) {
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n, err := vc.inner.Read(b)
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if err == io.EOF {
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got := hex.EncodeToString(vc.hasher.Sum(make([]byte, 0, vc.hasher.Size())))
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if want := vc.expected.Hex; got != want {
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return n, fmt.Errorf("error verifying %s checksum; got %q, want %q",
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vc.expected.Algorithm, got, want)
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}
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}
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return n, err
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}
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// VerifyReadCloser wraps the given io.ReadCloser to verify that its contents match
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// the provided v1.Hash before io.EOF is returned.
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func VerifyReadCloser(r io.ReadCloser, h v1.Hash) (io.ReadCloser, error) {
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w, err := v1.Hasher(h.Algorithm)
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if err != nil {
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return nil, err
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}
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r2 := io.TeeReader(r, w)
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return &readAndCloser{
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Reader: &verifyReader{
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inner: r2,
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hasher: w,
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expected: h,
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},
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CloseFunc: r.Close,
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}, nil
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}
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