mirror of
https://github.com/mudler/luet.git
synced 2025-07-22 19:21:39 +00:00
62 lines
1.6 KiB
Go
62 lines
1.6 KiB
Go
// Copyright 2018 Google LLC 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 v1util
|
|
|
|
import (
|
|
"encoding/hex"
|
|
"fmt"
|
|
"hash"
|
|
"io"
|
|
|
|
v1 "github.com/google/go-containerregistry/pkg/v1"
|
|
)
|
|
|
|
type verifyReader struct {
|
|
inner io.Reader
|
|
hasher hash.Hash
|
|
expected v1.Hash
|
|
}
|
|
|
|
// Read implements io.Reader
|
|
func (vc *verifyReader) Read(b []byte) (int, error) {
|
|
n, err := vc.inner.Read(b)
|
|
if err == io.EOF {
|
|
got := hex.EncodeToString(vc.hasher.Sum(make([]byte, 0, vc.hasher.Size())))
|
|
if want := vc.expected.Hex; got != want {
|
|
return n, fmt.Errorf("error verifying %s checksum; got %q, want %q",
|
|
vc.expected.Algorithm, got, want)
|
|
}
|
|
}
|
|
return n, err
|
|
}
|
|
|
|
// VerifyReadCloser wraps the given io.ReadCloser to verify that its contents match
|
|
// the provided v1.Hash before io.EOF is returned.
|
|
func VerifyReadCloser(r io.ReadCloser, h v1.Hash) (io.ReadCloser, error) {
|
|
w, err := v1.Hasher(h.Algorithm)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
r2 := io.TeeReader(r, w)
|
|
return &readAndCloser{
|
|
Reader: &verifyReader{
|
|
inner: r2,
|
|
hasher: w,
|
|
expected: h,
|
|
},
|
|
CloseFunc: r.Close,
|
|
}, nil
|
|
}
|