/* <!-- copyright */
/*
 * aria2 - The high speed download utility
 *
 * Copyright (C) 2015 Tatsuhiro Tsujikawa
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * In addition, as a special exception, the copyright holders give
 * permission to link the code of portions of this program with the
 * OpenSSL library under certain conditions as described in each
 * individual source file, and distribute linked combinations
 * including the two.
 * You must obey the GNU General Public License in all respects
 * for all of the code used other than OpenSSL.  If you modify
 * file(s) with this exception, you may extend this exception to your
 * version of the file(s), but you are not obligated to do so.  If you
 * do not wish to do so, delete this exception statement from your
 * version.  If you delete this exception statement from all source
 * files in the program, then also delete it here.
 */
/* copyright --> */
#ifndef D_SFTP_NEGOTIATION_COMMAND_H
#define D_SFTP_NEGOTIATION_COMMAND_H

#include "AbstractCommand.h"

namespace aria2 {

class SocketCore;
class AuthConfig;

class SftpNegotiationCommand : public AbstractCommand {
public:
  enum Seq {
    SEQ_HANDSHAKE,
    SEQ_AUTH_PASSWORD,
    SEQ_SFTP_OPEN,
    SEQ_SFTP_STAT,
    SEQ_SFTP_SEEK,
    SEQ_NEGOTIATION_COMPLETED,
    SEQ_DOWNLOAD_ALREADY_COMPLETED,
    SEQ_HEAD_OK,
    SEQ_FILE_PREPARATION,
    SEQ_EXIT,
  };

private:
  void onFileSizeDetermined(int64_t totalLength);
  void poolConnection() const;
  void onDryRunFileFound();
  std::string getPath() const;

  std::shared_ptr<SocketCore> socket_;
  Seq sequence_;
  std::unique_ptr<AuthConfig> authConfig_;
  // remote file path
  std::string path_;
  // expected host's public key message digest: hash type and digest
  // (raw binary value).
  std::string hashType_;
  std::string digest_;

protected:
  virtual bool executeInternal() CXX11_OVERRIDE;

public:
  SftpNegotiationCommand(cuid_t cuid, const std::shared_ptr<Request>& req,
                         const std::shared_ptr<FileEntry>& fileEntry,
                         RequestGroup* requestGroup, DownloadEngine* e,
                         const std::shared_ptr<SocketCore>& s,
                         Seq seq = SEQ_HANDSHAKE);
  virtual ~SftpNegotiationCommand();
};

} // namespace aria2

#endif // D_SFTP_NEGOTIATION_COMMAND_H