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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 static
import (
"io"
v1 "github.com/google/go-containerregistry/pkg/v1"
"github.com/google/go-containerregistry/pkg/v1/empty"
"github.com/google/go-containerregistry/pkg/v1/mutate"
"github.com/google/go-containerregistry/pkg/v1/types"
payloadsize "github.com/sigstore/cosign/v2/internal/pkg/cosign/payload/size"
"github.com/sigstore/cosign/v2/internal/pkg/now"
"github.com/sigstore/cosign/v2/pkg/oci"
"github.com/sigstore/cosign/v2/pkg/oci/signed"
)
// NewFile constructs a new v1.Image with the provided payload.
func NewFile(payload []byte, opts ...Option) (oci.File, error) {
o, err := makeOptions(opts...)
if err != nil {
return nil, err
}
base := mutate.MediaType(empty.Image, types.OCIManifestSchema1)
base = mutate.ConfigMediaType(base, o.ConfigMediaType)
layer := &staticLayer{
b: payload,
opts: o,
}
img, err := mutate.Append(base, mutate.Addendum{
Layer: layer,
})
if err != nil {
return nil, err
}
// Add annotations from options
img = mutate.Annotations(img, o.Annotations).(v1.Image)
if o.RecordCreationTimestamp {
t, err := now.Now()
if err != nil {
return nil, err
}
// Set the Created date to time of execution
img, err = mutate.CreatedAt(img, v1.Time{Time: t})
if err != nil {
return nil, err
}
}
return &file{
SignedImage: signed.Image(img),
layer: layer,
}, nil
}
type file struct {
oci.SignedImage
layer v1.Layer
}
var _ oci.File = (*file)(nil)
// FileMediaType implements oci.File
func (f *file) FileMediaType() (types.MediaType, error) {
return f.layer.MediaType()
}
// Payload implements oci.File
func (f *file) Payload() ([]byte, error) {
size, err := f.layer.Size()
if err != nil {
return nil, err
}
err = payloadsize.CheckSize(uint64(size))
if err != nil {
return nil, err
}
rc, err := f.layer.Uncompressed()
if err != nil {
return nil, err
}
defer rc.Close()
return io.ReadAll(rc)
}
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