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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 layout
import (
"fmt"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/layout"
"github.com/sigstore/cosign/v2/pkg/oci"
"github.com/sigstore/cosign/v2/pkg/oci/signed"
)
const (
kindAnnotation = "kind"
imageAnnotation = "dev.cosignproject.cosign/image"
imageIndexAnnotation = "dev.cosignproject.cosign/imageIndex"
sigsAnnotation = "dev.cosignproject.cosign/sigs"
attsAnnotation = "dev.cosignproject.cosign/atts"
)
// SignedImageIndex provides access to a local index reference, and its signatures.
func SignedImageIndex(path string) (oci.SignedImageIndex, error) {
p, err := layout.FromPath(path)
if err != nil {
return nil, err
}
ii, err := p.ImageIndex()
if err != nil {
return nil, err
}
return &index{
v1Index: ii,
}, nil
}
// We alias ImageIndex so that we can inline it without the type
// name colliding with the name of a method it had to implement.
type v1Index v1.ImageIndex
type index struct {
v1Index
}
var _ oci.SignedImageIndex = (*index)(nil)
// Signatures implements oci.SignedImageIndex
func (i *index) Signatures() (oci.Signatures, error) {
img, err := i.imageByAnnotation(sigsAnnotation)
if err != nil {
return nil, err
}
if img == nil {
return nil, nil
}
return &sigs{img}, nil
}
// Attestations implements oci.SignedImageIndex
func (i *index) Attestations() (oci.Signatures, error) {
img, err := i.imageByAnnotation(attsAnnotation)
if err != nil {
return nil, err
}
if img == nil {
return nil, nil
}
return &sigs{img}, nil
}
// Attestations implements oci.SignedImage
func (i *index) Attachment(name string) (oci.File, error) { //nolint: revive
return nil, fmt.Errorf("not yet implemented")
}
// SignedImage implements oci.SignedImageIndex
// if an empty hash is passed in, return the original image that was signed
func (i *index) SignedImage(h v1.Hash) (oci.SignedImage, error) {
var img v1.Image
var err error
if h.String() == ":" {
img, err = i.imageByAnnotation(imageAnnotation)
} else {
img, err = i.Image(h)
}
if err != nil {
return nil, err
}
if img == nil {
return nil, nil
}
return signed.Image(img), nil
}
// imageByAnnotation searches through all manifests in the index.json
// and returns the image that has the matching annotation
func (i *index) imageByAnnotation(annotation string) (v1.Image, error) {
manifest, err := i.IndexManifest()
if err != nil {
return nil, err
}
for _, m := range manifest.Manifests {
if val, ok := m.Annotations[kindAnnotation]; ok && val == annotation {
return i.Image(m.Digest)
}
}
return nil, nil
}
func (i *index) imageIndexByAnnotation(annotation string) (v1.ImageIndex, error) {
manifest, err := i.IndexManifest()
if err != nil {
return nil, err
}
for _, m := range manifest.Manifests {
if val, ok := m.Annotations[kindAnnotation]; ok && val == annotation {
return i.ImageIndex(m.Digest)
}
}
return nil, nil
}
// SignedImageIndex implements oci.SignedImageIndex
func (i *index) SignedImageIndex(h v1.Hash) (oci.SignedImageIndex, error) {
var ii v1.ImageIndex
var err error
if h.String() == ":" {
ii, err = i.imageIndexByAnnotation(imageIndexAnnotation)
} else {
ii, err = i.ImageIndex(h)
}
if err != nil {
return nil, err
}
if ii == nil {
return nil, nil
}
return &index{
v1Index: ii,
}, nil
}
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