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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 (
"encoding/json"
"github.com/google/go-containerregistry/pkg/v1/types"
"github.com/sigstore/cosign/v2/pkg/cosign/bundle"
ctypes "github.com/sigstore/cosign/v2/pkg/types"
)
// Option is a functional option for customizing static signatures.
type Option func(*options)
type options struct {
LayerMediaType types.MediaType
ConfigMediaType types.MediaType
Bundle *bundle.RekorBundle
RFC3161Timestamp *bundle.RFC3161Timestamp
Cert []byte
Chain []byte
Annotations map[string]string
RecordCreationTimestamp bool
}
func makeOptions(opts ...Option) (*options, error) {
o := &options{
LayerMediaType: ctypes.SimpleSigningMediaType,
ConfigMediaType: types.OCIConfigJSON,
Annotations: make(map[string]string),
}
for _, opt := range opts {
opt(o)
}
if o.Cert != nil {
o.Annotations[CertificateAnnotationKey] = string(o.Cert)
o.Annotations[ChainAnnotationKey] = string(o.Chain)
}
if o.Bundle != nil {
b, err := json.Marshal(o.Bundle)
if err != nil {
return nil, err
}
o.Annotations[BundleAnnotationKey] = string(b)
}
if o.RFC3161Timestamp != nil {
b, err := json.Marshal(o.RFC3161Timestamp)
if err != nil {
return nil, err
}
o.Annotations[RFC3161TimestampAnnotationKey] = string(b)
}
return o, nil
}
// WithLayerMediaType sets the media type of the signature.
func WithLayerMediaType(mt types.MediaType) Option {
return func(o *options) {
o.LayerMediaType = mt
}
}
// WithConfigMediaType sets the media type of the signature.
func WithConfigMediaType(mt types.MediaType) Option {
return func(o *options) {
o.ConfigMediaType = mt
}
}
// WithAnnotations sets the annotations that will be associated.
func WithAnnotations(ann map[string]string) Option {
return func(o *options) {
o.Annotations = ann
}
}
// WithBundle sets the bundle to attach to the signature
func WithBundle(b *bundle.RekorBundle) Option {
return func(o *options) {
o.Bundle = b
}
}
// WithRFC3161Timestamp sets the time-stamping bundle to attach to the signature
func WithRFC3161Timestamp(b *bundle.RFC3161Timestamp) Option {
return func(o *options) {
o.RFC3161Timestamp = b
}
}
// WithCertChain sets the certificate chain for this signature.
func WithCertChain(cert, chain []byte) Option {
return func(o *options) {
o.Cert = cert
o.Chain = chain
}
}
// WithRecordCreationTimestamp sets the feature flag to honor the creation timestamp to time of running
func WithRecordCreationTimestamp(rct bool) Option {
return func(o *options) {
o.RecordCreationTimestamp = rct
}
}
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