/
generic.go
57 lines (44 loc) · 1.34 KB
/
generic.go
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package hash
import (
"fmt"
"hash"
"io"
"github.com/dpb587/metalink"
"github.com/dpb587/metalink/file"
"github.com/dpb587/metalink/verification"
"github.com/pkg/errors"
)
type hashNewer func() hash.Hash
type genericSignerVerifier struct {
newer hashNewer
hashType metalink.HashType
}
var _ verification.SignerVerifier = genericSignerVerifier{}
func NewGenericSignerVerifier(hashType metalink.HashType, newer hashNewer) genericSignerVerifier {
return genericSignerVerifier{
newer: newer,
hashType: hashType,
}
}
func (v genericSignerVerifier) Sign(expected file.Reference) (verification.Verification, error) {
reader, err := expected.Reader()
if err != nil {
return nil, errors.Wrap(err, "Opening for signing")
}
hash := v.newer()
_, err = io.Copy(hash, reader)
if err != nil {
return nil, errors.Wrap(err, "Reading for signing")
}
return NewGenericVerification(v.hashType, fmt.Sprintf("%x", hash.Sum(nil))), nil
}
func (v genericSignerVerifier) Verify(actual file.Reference, expected metalink.File) verification.VerificationResult {
actualHash, err := v.Sign(actual)
if err != nil {
return verification.NewSimpleVerificationResult(string(v.hashType), errors.Wrap(err, "Calculating actual hash"), "")
}
return actualHash.Verify(expected)
}
func (v genericSignerVerifier) HashType() metalink.HashType {
return v.hashType
}