HelloBack.h

Go to the documentation of this file.

/*
 * Deskflow -- mouse and keyboard sharing utility
 * SPDX-FileCopyrightText: (C) 2024 Symless Ltd.
 * SPDX-License-Identifier: GPL-2.0-only WITH LicenseRef-OpenSSL-Exception
 */
 
#pragma once
 
#include "common/Common.h"
#include "deskflow/ProtocolTypes.h"
#include "io/IStream.h"
 
#include <functional>
#include <memory>
 
namespace deskflow::client {
 
class HelloBack
{
public:
  struct Deps
  {
    Deps() = default;
    explicit Deps(std::function<void()> invalidHello, std::function<void(int, int)> incompatible)
        : m_invalidHello(std::move(invalidHello)),
          m_incompatible(std::move(incompatible))
    {
      // do nothing
    }
    virtual ~Deps() = default;

    virtual void invalidHello();

    virtual void incompatible(int major, int minor);
 
  private:
    std::function<void()> m_invalidHello;
    std::function<void(int, int)> m_incompatible;
  };
 
  explicit HelloBack(
      std::shared_ptr<Deps> deps, const int16_t majorVersion = kProtocolMajorVersion,
      const int16_t minorVersion = kProtocolMinorVersion
  )
      : m_deps(deps),
        m_majorVersion(majorVersion),
        m_minorVersion(minorVersion)
  {
    // do nothing
  }

  void handleHello(deskflow::IStream *stream, const std::string &clientName) const;
 
private:
  bool shouldDowngrade(int major, int minor) const;
 
  std::shared_ptr<Deps> m_deps;
  int16_t m_majorVersion;
  int16_t m_minorVersion;
};
 
} // namespace deskflow::client