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// Copyright The Notary Project 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 envelope
import (
"errors"
"fmt"
"time"
"github.com/notaryproject/notation-core-go/signature"
ocispec "github.com/opencontainers/image-spec/specs-go/v1"
)
// MediaTypePayloadV1 is the supported content type for signature's payload.
const (
MediaTypePayloadV1 = "application/vnd.cncf.notary.payload.v1+json"
AnnotationX509ChainThumbprint = "io.cncf.notary.x509chain.thumbprint#S256"
)
// Payload describes the content that gets signed.
type Payload struct {
TargetArtifact ocispec.Descriptor `json:"targetArtifact"`
}
// ValidatePayloadContentType validates signature payload's content type.
func ValidatePayloadContentType(payload *signature.Payload) error {
switch payload.ContentType {
case MediaTypePayloadV1:
return nil
default:
return fmt.Errorf("payload content type %q not supported", payload.ContentType)
}
}
// SanitizeTargetArtifact filters out unrelated ocispec.Descriptor fields based
// on notation spec (https://github.com/notaryproject/notaryproject/blob/main/specs/signature-specification.md#payload).
func SanitizeTargetArtifact(targetArtifact ocispec.Descriptor) ocispec.Descriptor {
return ocispec.Descriptor{
MediaType: targetArtifact.MediaType,
Digest: targetArtifact.Digest,
Size: targetArtifact.Size,
Annotations: targetArtifact.Annotations,
}
}
// SigningTime returns the signing time of a signature envelope blob
func SigningTime(signerInfo *signature.SignerInfo) (time.Time, error) {
// sanity check
if signerInfo == nil {
return time.Time{}, errors.New("failed to generate annotations: signerInfo cannot be nil")
}
signingTime := signerInfo.SignedAttributes.SigningTime
if signingTime.IsZero() {
return time.Time{}, errors.New("signing time is missing")
}
return signingTime.UTC(), nil
}
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