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// Copyright 2023 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 remote
import (
"bytes"
"context"
"encoding/json"
"github.com/google/go-containerregistry/pkg/name"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/partial"
"github.com/google/go-containerregistry/pkg/v1/types"
)
type schema1 struct {
ref name.Reference
ctx context.Context
fetcher fetcher
manifest []byte
mediaType types.MediaType
descriptor *v1.Descriptor
}
func (s *schema1) Layers() ([]v1.Layer, error) {
m := schema1Manifest{}
if err := json.NewDecoder(bytes.NewReader(s.manifest)).Decode(&m); err != nil {
return nil, err
}
layers := []v1.Layer{}
for i := len(m.FSLayers) - 1; i >= 0; i-- {
fsl := m.FSLayers[i]
h, err := v1.NewHash(fsl.BlobSum)
if err != nil {
return nil, err
}
l, err := s.LayerByDigest(h)
if err != nil {
return nil, err
}
layers = append(layers, l)
}
return layers, nil
}
func (s *schema1) MediaType() (types.MediaType, error) {
return s.mediaType, nil
}
func (s *schema1) Size() (int64, error) {
return s.descriptor.Size, nil
}
func (s *schema1) ConfigName() (v1.Hash, error) {
return partial.ConfigName(s)
}
func (s *schema1) ConfigFile() (*v1.ConfigFile, error) {
return nil, newErrSchema1(s.mediaType)
}
func (s *schema1) RawConfigFile() ([]byte, error) {
return []byte("{}"), nil
}
func (s *schema1) Digest() (v1.Hash, error) {
return s.descriptor.Digest, nil
}
func (s *schema1) Manifest() (*v1.Manifest, error) {
return nil, newErrSchema1(s.mediaType)
}
func (s *schema1) RawManifest() ([]byte, error) {
return s.manifest, nil
}
func (s *schema1) LayerByDigest(h v1.Hash) (v1.Layer, error) {
l, err := partial.CompressedToLayer(&remoteLayer{
fetcher: s.fetcher,
ctx: s.ctx,
digest: h,
})
if err != nil {
return nil, err
}
return &MountableLayer{
Layer: l,
Reference: s.ref.Context().Digest(h.String()),
}, nil
}
func (s *schema1) LayerByDiffID(v1.Hash) (v1.Layer, error) {
return nil, newErrSchema1(s.mediaType)
}
type fslayer struct {
BlobSum string `json:"blobSum"`
}
type schema1Manifest struct {
FSLayers []fslayer `json:"fsLayers"`
}
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