/*
 * Copyright 2023 Yunseong Hwang
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#ifndef API_KEY_AUTH_PROCESSOR_H
#define API_KEY_AUTH_PROCESSOR_H

#include <grpcpp/security/auth_metadata_processor.h>
#include <unordered_set>

class ApiKeyAuthProcessor : public grpc::AuthMetadataProcessor {
private:
  std::unordered_set<std::string> m_allowed_keys;

public:
  explicit ApiKeyAuthProcessor(std::unordered_set<std::string> allowed_keys)
      : m_allowed_keys(std::move(allowed_keys)) {}

  virtual grpc::Status Process(
      const InputMetadata &auth_metadata, grpc::AuthContext *context,
      OutputMetadata *consumed_auth_metadata, OutputMetadata *response_metadata
  ) override;
};

#endif // API_KEY_AUTH_PROCESSOR_H