// Copyright 2023 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.
//
////////////////////////////////////////////////////////////////////////////////

#include "tink/internal/mutable_serialization_registry.h"

#include <memory>

#include "absl/memory/memory.h"
#include "absl/status/status.h"
#include "absl/synchronization/mutex.h"
#include "tink/insecure_secret_key_access.h"
#include "tink/internal/key_parser.h"
#include "tink/internal/key_serializer.h"
#include "tink/internal/legacy_proto_key.h"
#include "tink/internal/parameters_parser.h"
#include "tink/internal/parameters_serializer.h"
#include "tink/internal/proto_key_serialization.h"
#include "tink/internal/serialization.h"
#include "tink/internal/serialization_registry.h"
#include "tink/key.h"
#include "tink/parameters.h"
#include "tink/secret_key_access_token.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"

namespace crypto {
namespace tink {
namespace internal {

MutableSerializationRegistry& MutableSerializationRegistry::GlobalInstance() {
  static MutableSerializationRegistry* instance =
      new MutableSerializationRegistry();
  return *instance;
}

util::Status MutableSerializationRegistry::RegisterParametersParser(
    ParametersParser* parser) {
  absl::WriterMutexLock lock(&registry_mutex_);
  SerializationRegistry::Builder builder(registry_);
  util::Status status = builder.RegisterParametersParser(parser);
  if (!status.ok()) return status;
  registry_ = builder.Build();
  return util::OkStatus();
}

util::Status MutableSerializationRegistry::RegisterParametersSerializer(
    ParametersSerializer* serializer) {
  absl::WriterMutexLock lock(&registry_mutex_);
  SerializationRegistry::Builder builder(registry_);
  util::Status status = builder.RegisterParametersSerializer(serializer);
  if (!status.ok()) return status;
  registry_ = builder.Build();
  return util::OkStatus();
}

util::Status MutableSerializationRegistry::RegisterKeyParser(
    KeyParser* parser) {
  absl::WriterMutexLock lock(&registry_mutex_);
  SerializationRegistry::Builder builder(registry_);
  util::Status status = builder.RegisterKeyParser(parser);
  if (!status.ok()) return status;
  registry_ = builder.Build();
  return util::OkStatus();
}

util::Status MutableSerializationRegistry::RegisterKeySerializer(
    KeySerializer* serializer) {
  absl::WriterMutexLock lock(&registry_mutex_);
  SerializationRegistry::Builder builder(registry_);
  util::Status status = builder.RegisterKeySerializer(serializer);
  if (!status.ok()) return status;
  registry_ = builder.Build();
  return util::OkStatus();
}

util::StatusOr<std::unique_ptr<Parameters>>
MutableSerializationRegistry::ParseParameters(
    const Serialization& serialization) {
  absl::ReaderMutexLock lock(&registry_mutex_);
  return registry_.ParseParameters(serialization);
}

util::StatusOr<std::unique_ptr<Key>> MutableSerializationRegistry::ParseKey(
    const Serialization& serialization,
    absl::optional<SecretKeyAccessToken> token) {
  absl::ReaderMutexLock lock(&registry_mutex_);
  return registry_.ParseKey(serialization, token);
}

util::StatusOr<std::unique_ptr<Key>>
MutableSerializationRegistry::ParseKeyWithLegacyFallback(
    const Serialization& serialization, SecretKeyAccessToken token) {
  util::StatusOr<std::unique_ptr<Key>> key = ParseKey(serialization, token);
  if (key.status().code() == absl::StatusCode::kNotFound) {
    const ProtoKeySerialization* proto_serialization =
        dynamic_cast<const ProtoKeySerialization*>(&serialization);
    util::StatusOr<LegacyProtoKey> proto_key = internal::LegacyProtoKey::Create(
        *proto_serialization, InsecureSecretKeyAccess::Get());
    if (!proto_key.ok()) return proto_key.status();
    return {absl::make_unique<LegacyProtoKey>(*proto_key)};
  }
  if (!key.ok()) return key.status();
  return key;
}

}  // namespace internal
}  // namespace tink
}  // namespace crypto