// Copyright 2020 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
//
//     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.
//
///////////////////////////////////////////////////////////////////////////////

// Implementation of an AEAD Service.
#include "aead_impl.h"

#include <memory>
#include <string>
#include <utility>

#include "tink/aead.h"
#include "create.h"

namespace tink_testing_api {

using ::crypto::tink::util::StatusOr;

::grpc::Status AeadImpl::Create(grpc::ServerContext* context,
                                const CreationRequest* request,
                                CreationResponse* response) {
  return CreatePrimitiveForRpc<crypto::tink::Aead>(request, response);
}

::grpc::Status AeadImpl::Encrypt(grpc::ServerContext* context,
                                 const AeadEncryptRequest* request,
                                 AeadEncryptResponse* response) {
  StatusOr<std::unique_ptr<crypto::tink::Aead>> aead =
      PrimitiveFromSerializedBinaryProtoKeyset<crypto::tink::Aead>(
          request->annotated_keyset());
  if (!aead.ok()) {
    return grpc::Status(
        grpc::StatusCode::FAILED_PRECONDITION,
        absl::StrCat("Creating primitive failed: ", aead.status().message()));
  }

  StatusOr<std::string> ciphertext =
      (*aead)->Encrypt(request->plaintext(), request->associated_data());
  if (!ciphertext.ok()) {
    response->set_err(std::string(ciphertext.status().message()));
    return grpc::Status::OK;
  }
  response->set_ciphertext(*ciphertext);
  return grpc::Status::OK;
}

grpc::Status AeadImpl::Decrypt(grpc::ServerContext* context,
                                 const AeadDecryptRequest* request,
                                 AeadDecryptResponse* response) {
  StatusOr<std::unique_ptr<crypto::tink::Aead>> aead =
      PrimitiveFromSerializedBinaryProtoKeyset<crypto::tink::Aead>(
          request->annotated_keyset());
  if (!aead.ok()) {
    return grpc::Status(
        grpc::StatusCode::FAILED_PRECONDITION,
        absl::StrCat("Creating primitive failed: ", aead.status().message()));
  }

  StatusOr<std::string> plaintext =
      (*aead)->Decrypt(request->ciphertext(), request->associated_data());
  if (!plaintext.ok()) {
    response->set_err(std::string(plaintext.status().message()));
    return grpc::Status::OK;
  }
  response->set_plaintext(*plaintext);
  return grpc::Status::OK;
}

}  // namespace tink_testing_api