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//
// Copyright 2021 The Sigstore Authors.
//
// 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 empty
import (
"errors"
"fmt"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/empty"
"github.com/sigstore/cosign/v2/pkg/oci"
)
type signedImage struct {
v1.Image
digest v1.Hash
signature oci.Signatures
attestations oci.Signatures
}
func (se *signedImage) Signatures() (oci.Signatures, error) {
return se.signature, nil
}
func (se *signedImage) Attestations() (oci.Signatures, error) {
return se.attestations, nil
}
func (se *signedImage) Attachment(name string) (oci.File, error) { //nolint: revive
return nil, errors.New("no attachments")
}
func (se *signedImage) Digest() (v1.Hash, error) {
if se.digest.Hex == "" {
return v1.Hash{}, fmt.Errorf("digest not available")
}
return se.digest, nil
}
func SignedImage(ref name.Reference) (oci.SignedImage, error) {
var err error
d := v1.Hash{}
base := empty.Image
if digest, ok := ref.(name.Digest); ok {
d, err = v1.NewHash(digest.DigestStr())
if err != nil {
return nil, err
}
}
return &signedImage{
Image: base,
digest: d,
signature: Signatures(),
attestations: Signatures(),
}, nil
}
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