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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 timestamp provides functionalities of timestamp countersignature
package timestamp
import (
"crypto/x509"
"github.com/notaryproject/notation-core-go/signature"
nx509 "github.com/notaryproject/notation-core-go/x509"
"github.com/notaryproject/tspclient-go"
)
// Timestamp generates a timestamp request and sends to TSA. It then validates
// the TSA certificate chain against Notary Project certificate and signature
// algorithm requirements.
// On success, it returns the full bytes of the timestamp token received from
// TSA.
//
// Reference: https://github.com/notaryproject/specifications/blob/v1.0.0/specs/signature-specification.md#leaf-certificates
func Timestamp(req *signature.SignRequest, opts tspclient.RequestOptions) ([]byte, error) {
tsaRequest, err := tspclient.NewRequest(opts)
if err != nil {
return nil, err
}
ctx := req.Context()
resp, err := req.Timestamper.Timestamp(ctx, tsaRequest)
if err != nil {
return nil, err
}
token, err := resp.SignedToken()
if err != nil {
return nil, err
}
info, err := token.Info()
if err != nil {
return nil, err
}
timestamp, err := info.Validate(opts.Content)
if err != nil {
return nil, err
}
tsaCertChain, err := token.Verify(ctx, x509.VerifyOptions{
CurrentTime: timestamp.Value,
Roots: req.TSARootCAs,
})
if err != nil {
return nil, err
}
if err := nx509.ValidateTimestampingCertChain(tsaCertChain); err != nil {
return nil, err
}
return resp.TimestampToken.FullBytes, nil
}
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