// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef QUICHE_QUIC_MASQUE_MASQUE_DISPATCHER_H_
#define QUICHE_QUIC_MASQUE_MASQUE_DISPATCHER_H_

#include <cstdint>
#include <memory>

#include "absl/strings/string_view.h"
#include "quiche/quic/core/connection_id_generator.h"
#include "quiche/quic/core/crypto/quic_crypto_server_config.h"
#include "quiche/quic/core/io/quic_event_loop.h"
#include "quiche/quic/core/quic_alarm_factory.h"
#include "quiche/quic/core/quic_config.h"
#include "quiche/quic/core/quic_connection.h"
#include "quiche/quic/core/quic_connection_id.h"
#include "quiche/quic/core/quic_crypto_server_stream_base.h"
#include "quiche/quic/core/quic_session.h"
#include "quiche/quic/core/quic_types.h"
#include "quiche/quic/core/quic_version_manager.h"
#include "quiche/quic/core/quic_versions.h"
#include "quiche/quic/masque/masque_server_backend.h"
#include "quiche/quic/masque/masque_utils.h"
#include "quiche/quic/platform/api/quic_export.h"
#include "quiche/quic/platform/api/quic_socket_address.h"
#include "quiche/quic/tools/quic_simple_dispatcher.h"

namespace quic {

// QUIC dispatcher that handles new MASQUE connections and can proxy traffic
// between MASQUE clients and QUIC servers.
class QUIC_NO_EXPORT MasqueDispatcher : public QuicSimpleDispatcher {
 public:
  explicit MasqueDispatcher(
      MasqueMode masque_mode, const QuicConfig* config,
      const QuicCryptoServerConfig* crypto_config,
      QuicVersionManager* version_manager, QuicEventLoop* event_loop,
      std::unique_ptr<QuicConnectionHelperInterface> helper,
      std::unique_ptr<QuicCryptoServerStreamBase::Helper> session_helper,
      std::unique_ptr<QuicAlarmFactory> alarm_factory,
      MasqueServerBackend* masque_server_backend,
      uint8_t expected_server_connection_id_length,
      ConnectionIdGeneratorInterface& generator);

  // Disallow copy and assign.
  MasqueDispatcher(const MasqueDispatcher&) = delete;
  MasqueDispatcher& operator=(const MasqueDispatcher&) = delete;

  // From QuicSimpleDispatcher.
  std::unique_ptr<QuicSession> CreateQuicSession(
      QuicConnectionId connection_id, const QuicSocketAddress& self_address,
      const QuicSocketAddress& peer_address, absl::string_view alpn,
      const ParsedQuicVersion& version,
      const quic::ParsedClientHello& parsed_chlo,
      quic::ConnectionIdGeneratorInterface& connection_id_generator) override;

 private:
  MasqueMode masque_mode_;
  QuicEventLoop* event_loop_;                   // Unowned.
  MasqueServerBackend* masque_server_backend_;  // Unowned.
};

}  // namespace quic

#endif  // QUICHE_QUIC_MASQUE_MASQUE_DISPATCHER_H_