// 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 "tink/aead.h"
#include "tink/binary_keyset_reader.h"
#include "tink/cleartext_keyset_handle.h"
#include "proto/testing/testing_api.grpc.pb.h"

namespace tink_testing_api {

using ::crypto::tink::BinaryKeysetReader;
using ::crypto::tink::CleartextKeysetHandle;
using ::grpc::ServerContext;
using ::grpc::Status;

AeadImpl::AeadImpl() {}

// Encrypts a message
::grpc::Status AeadImpl::Encrypt(grpc::ServerContext* context,
                                 const AeadEncryptRequest* request,
                                 AeadEncryptResponse* response) {
  auto reader_result = BinaryKeysetReader::New(request->keyset());
  if (!reader_result.ok()) {
    response->set_err(reader_result.status().error_message());
    return ::grpc::Status::OK;
  }
  auto handle_result =
      CleartextKeysetHandle::Read(std::move(reader_result.ValueOrDie()));
  if (!handle_result.ok()) {
    response->set_err(handle_result.status().error_message());
    return ::grpc::Status::OK;
  }
  auto aead_result =
      handle_result.ValueOrDie()->GetPrimitive<crypto::tink::Aead>();
  if (!aead_result.ok()) {
    response->set_err(aead_result.status().error_message());
    return ::grpc::Status::OK;
  }
  auto encrypt_result = aead_result.ValueOrDie()->Encrypt(
      request->plaintext(), request->associated_data());
  if (!encrypt_result.ok()) {
    response->set_err(encrypt_result.status().error_message());
    return ::grpc::Status::OK;
  }
  response->set_ciphertext(encrypt_result.ValueOrDie());
  return ::grpc::Status::OK;
}

// Decrypts a ciphertext
::grpc::Status AeadImpl::Decrypt(grpc::ServerContext* context,
                                 const AeadDecryptRequest* request,
                                 AeadDecryptResponse* response) {
  auto reader_result = BinaryKeysetReader::New(request->keyset());
  if (!reader_result.ok()) {
    response->set_err(reader_result.status().error_message());
    return ::grpc::Status::OK;
  }
  auto handle_result =
      CleartextKeysetHandle::Read(std::move(reader_result.ValueOrDie()));
  if (!handle_result.ok()) {
    response->set_err(handle_result.status().error_message());
    return ::grpc::Status::OK;
  }
  auto aead_result =
      handle_result.ValueOrDie()->GetPrimitive<crypto::tink::Aead>();
  if (!aead_result.ok()) {
    response->set_err(aead_result.status().error_message());
    return ::grpc::Status::OK;
  }
  auto decrypt_result = aead_result.ValueOrDie()->Decrypt(
      request->ciphertext(), request->associated_data());
  if (!decrypt_result.ok()) {
    response->set_err(decrypt_result.status().error_message());
    return ::grpc::Status::OK;
  }
  response->set_plaintext(decrypt_result.ValueOrDie());
  return ::grpc::Status::OK;
}

}  // namespace tink_testing_api