/* This file is part of the KDE libraries
   Copyright (C) 1999 Torben Weis <weis@kde.org>
   Copyright (C) 2000- Waldo Bastain <bastain@kde.org>
   Copyright (C) 2000- Dawit Alemayehu <adawit@kde.org>

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License version 2 as published by the Free Software Foundation.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/
#ifndef __kprotocolmanager_h__
#define __kprotocolmanager_h__

#include <qstringlist.h>

#include <kapplication.h>
#include <kio/global.h>

/** @deprecated Use KProtocolManager::defaultUserAgent() instead. */
#define DEFAULT_USERAGENT_STRING ""

class KConfig;
class KPAC;

/**
 * Provides information about I/O (Internet, etc.) settings chosen/set
 * by the end user.
 *
 * KProtocolManager has a heap of static functions that allows only read
 * access to KDE's IO related settings. These include proxy, cache, file
 * transfer resumption, timeout and user-agent related settings.
 *
 * The information provided by this class is generic enough to be applicable
 * to any application that makes use of KDE's IO sub-system.  Note that this
 * mean the proxy, timeout etc. settings are saved in a separate user-specific
 * config file and not in the config file of the application.
 *
 * @p Original author:
 * @author Torben Weis <weis@kde.org>
 *
 * @p Revised by:
 * @author Waldo Bastain <bastain@kde.org>
 * @author Dawit Alemayehu <adawit@kde.org>
 */
class KProtocolManager
{
public:


/*=========================== USER-AGENT SETTINGS ===========================*/


  /**
   * Returns the default user-agent string.
   *
   * This function returns the default user-agent string
   *
   */
  static QString defaultUserAgent();

  /**
   * Returns the default user-agent value.
   *
   * This function returns the default user-agent value
   * taking into account 'keys'
   *
   * Keys can be any of the folliwing:
   * 'o'	Show OS
   * 'v'	Show OS Version
   * 'p'	Show platform
   * 'm'	Show machine architecture
   * 'l'	Show language
   *
   */
  static QString defaultUserAgent(const QString &keys);

  /**
   * Returns the userAgent string configured for the
   * specified host.
   *
   * If hostname is not found or is empty (i.e. "" or
   * QString::null) this function will return the default
   * user agent.
   *
   * @param hostname name of the host
   * @return specified userAgent string
   */
  static QString userAgentForHost( const QString& );


/*=========================== TIMEOUT CONFIG ================================*/


  /**
   * Returns the preferred timeout value for reading from
   * remote connections in seconds.
   *
   * @return timeout value for remote connection in secs.
   */
  static int readTimeout();

  /**
   * Returns the preferred timeout value for remote connections
   * in seconds.
   *
   * @return timeout value for remote connection in secs.
   */
  static int connectTimeout();

  /**
   * Returns the preferred timeout value for proxy connections
   * in seconds.
   *
   * @return timeout value for proxy connection in secs.
   */
  static int proxyConnectTimeout();

  /**
   * Returns the preferred response timeout value for
   * remote connecting in seconds.
   *
   * @return timeout value for remote connection in seconds.
   */
  static int responseTimeout();

  /**
   * Returns the set default timeout value for connecting
   * to remote machines.
   *
   * @return timeout value in seconds
   */
  static int defaultConnectTimeout();


/*=============================== PROXY CONFIG ==============================*/


  /**
   * Returns whether or not the user specified the
   * use of proxy server to make connections.
   */
  static bool useProxy();

  /**
   * Returns whether or not the the proxy server
   * lookup should be reversed or not.
   */
  static bool useReverseProxy();

  /**
   * Types of proxy configuration
   * @li NoProxy     - No proxy is used
   * @li ManualProxy - Proxies are manually configured
   * @li PACProxy    - A Proxy configuration URL has been given
   * @li WPADProxy   - A proxy should be automatically discovered
   * @li EnvVarProxy - Use the proxy values set through environment variables.
   */
  enum ProxyType
  {
      NoProxy,
      ManualProxy,
      PACProxy,
      WPADProxy,
      EnvVarProxy
  };

  /**
   * Returns the type of proxy configuration that is used.
   */
  static ProxyType proxyType();

  /**
   * Proxy authorization modes.
   *
   * @li Prompt     - Ask for authorization as needed
   * @li Automatic  - Use auto login as defined in kionetrc files.
   */
  enum ProxyAuthMode
  {
      Prompt,
      Automatic
  };

  /**
   * Returns the way proxy authorization should be handled.
   *
   * @see ProxyAuthMode
   */
  static ProxyAuthMode proxyAuthMode();

  /**
   * Returns the strings for hosts that should contacted
   * DIRECT bypassing any proxy settings.
   */
  static QString noProxyFor();

  /*
   * Returns the proxy server address for a given
   * protocol
   *
   * @param protocol the protocol whose proxy info is needed
   * @returns the proxy server address if one is available
   */
  static QString proxyFor( const QString& /* protocol */);

  /**
   * Returns the Proxy server address for a given URL
   * If automatic proxy configuration is configured, @ref KPAC
   * is used to determine the proxy server, otherwise the return
   * value of @ref #proxyFor for the URL's protocol is used.
   * If an empty string is returned, the request is to be aborted,
   * a return value of "DIRECT" requests a direct connection.
   *
   * @param url the URL whose proxy info is needed
   * @returns the proxy server address if one is available
   */
  static QString proxyForURL( const KURL& /* url */ );

  /**
   * Marks this proxy as bad (down). It will not be used for the
   * next 30 minutes. (The script may supply an alternate proxy)
   */
  static void badProxy( const QString & /* proxy */ );

  /**
   * @return the URL of the script for automatic proxy configuration
   */
  static QString proxyConfigScript();


/*========================== CACHE CONFIG ===================================*/


  /**
   * Returns true/false to indicate whether a cache
   * should be used
   *
   * @return
   */
  static bool useCache();

  /**
   * Returns the maximum age in seconds cached files should be
   * kept before they are deleted as necessary.
   *
   * @return
   */
  static int maxCacheAge();

  /**
   * Returns the maximum size that can be used for caching.
   *
   * By default this function returns the DEFAULT_MAX_CACHE_SIZE
   * value as defined in http_slave_defaults.h.  Not that the
   * value returned is in bytes, hence a value of 5120 would mean
   * 5 Kb.
   *
   * @return the maximum cache size to
   */
  static int maxCacheSize(); // Maximum cache size in Kb.

  /**
   * The directory which contains the cache files
   */
  static QString cacheDir();

  /**
   * Returns the Cache control directive to be used.
   */
  static KIO::CacheControl cacheControl();


/*============================ DOWNLOAD CONFIG ==============================*/

  /**
   * Returns true if partial downloads should be
   * automatically resumed.
   */
  static bool autoResume();

  /**
   * Returns true if partial downloads should be marked
   * with a ".part" extension.
   */
  static bool markPartial();

  /**
   * Returns the minimum file size for keeping aborted
   * downloads.
   *
   * Any data downloaded that does not meet this minimum
   * requirement will simply be discarded. The default size
   * is 5 KB.
   *
   * @ return the minimum keep size for aborted downloads in bytes.
   */
  static int minimumKeepSize();
  
  
  /*============================ NETWORK CONNECTIONS ==========================*/
  /**
   * Returns true if connections should be persistent
   * @since 3.1
   */
  static bool persistentProxyConnection(); 

  /**
   * Returns true if connections should be persistent
   */
  static bool persistentConnections();

/*=============================== OTHERS ====================================*/


  /**
   * Force a reload of the general config file of
   * io-slaves ( kioslaverc).
   */
  static void reparseConfiguration();

  /**
   * Return the protocol to use in order to handle the given @p url
   * It's usually the same, except that FTP, when handled by a proxy,
   * needs an HTTP ioslave.
   *
   * When a proxy is to be used, proxy contains the URL for the proxy.
   */
  static QString slaveProtocol(const KURL &url, QString &proxy);

  /**
   * @internal
   * (Shared with SlaveConfig)
   */
  static KConfig *config();
private:
  static KConfig *http_config();
  static KPAC *pac();
};
#endif
