cose/timestamp_updater.h

// Copyright 2026 Google LLC
//
// 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
//
//    https://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.
//

#ifndef THIRD_PARTY_CREDENTIO_COSE_TIMESTAMP_UPDATER_H_
#define THIRD_PARTY_CREDENTIO_COSE_TIMESTAMP_UPDATER_H_

#include <string>

#include "absl/base/nullability.h"
#include "absl/functional/any_invocable.h"
#include "absl/log/die_if_null.h"
#include "absl/status/status.h"
#include "async/async_context.h"
#include "cose/timestamp_creator.h"

namespace credentio {

// Updates the timestamp in a COSE C2PA claim signature.
class TimestampUpdater {
 public:
  explicit TimestampUpdater(
      const TimestampCreator* absl_nonnull timestamp_creator)
      : timestamp_creator_(*ABSL_DIE_IF_NULL(timestamp_creator)) {}

  // Creates a timestamp, and if successful, updates the timestamp in the
  // provided serialized COSE_Sign1_Tagged structure. It guarantees that the
  // size of the serialized structure does not change.
  void UpdateTimestamp(std::string* absl_nonnull encoded_cose_sign1,
                       AsyncContext async_context,
                       absl::AnyInvocable<void(absl::Status) &&> cb) const;

 private:
  const TimestampCreator& timestamp_creator_;
};

}  // namespace credentio

#endif  // THIRD_PARTY_CREDENTIO_COSE_TIMESTAMP_UPDATER_H_