classic_auth_native_forwarder.h

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/*
  Copyright (c) 2023, 2025, Oracle and/or its affiliates.
 
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.
 
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  as designated in a particular file or component or in included license
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  permission to link the program and your derivative works with the
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  the program or referenced in the documentation.
 
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
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  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
 
#ifndef ROUTING_CLASSIC_AUTH_NATIVE_FORWARDER_INCLUDED
#define ROUTING_CLASSIC_AUTH_NATIVE_FORWARDER_INCLUDED
 
#include <optional>
#include <string>
#include <string_view>
#include <system_error>
 
#include "classic_auth_native.h"
#include "classic_connection_base.h"
#include "forwarding_processor.h"
#include "mysql/harness/stdx/expected.h"
 
class AuthNativeForwarder : public ForwardingProcessor {
 public:
  AuthNativeForwarder(MysqlRoutingClassicConnectionBase *conn,
                      std::string initial_server_auth_data,
                      bool in_handshake = false)
      : ForwardingProcessor(conn),
        initial_server_auth_data_{std::move(initial_server_auth_data)},
        stage_{in_handshake ? Stage::Response : Stage::Init} {}
 
  enum class Stage {
    Init,
 
    ClientData,
    CachingSha2Scrambled,
    CachingSha2Plaintext,
    CachingSha2Encrypted,
    Response,
 
    Error,
    Ok,
 
    Done,
  };
 
  stdx::expected<Result, std::error_code> process() override;
 
  void stage(Stage stage) { stage_ = stage; }
  [[nodiscard]] Stage stage() const { return stage_; }
 
 private:
  using Auth = AuthNativePassword;
 
  stdx::expected<Result, std::error_code> init();
  stdx::expected<Result, std::error_code> client_data();
  stdx::expected<Result, std::error_code> caching_sha2_scrambled();
  stdx::expected<Result, std::error_code> caching_sha2_encrypted();
  stdx::expected<Result, std::error_code> caching_sha2_plaintext();
  stdx::expected<Result, std::error_code> response();
  stdx::expected<Result, std::error_code> error();
  stdx::expected<Result, std::error_code> ok();
 
  std::string initial_server_auth_data_;
 
  Stage stage_;
};
 
#endif