<?php
/*
	+-----------------------------------------------------------------------------+
	| ILIAS open source                                                           |
	+-----------------------------------------------------------------------------+
	| Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
	|                                                                             |
	| 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
	+-----------------------------------------------------------------------------+
*/

include_once("classes/class.ilObjectAccess.php");

/**
* Class ilObjGlossaryAccess
*
*
* @author Alex Killing <alex.killing@gmx.de>
* @version $Id: class.ilObjGlossaryAccess.php,v 1.10 2006/07/29 16:12:35 akill Exp $
*
* @ingroup ModulesGlossary
*/
class ilObjGlossaryAccess extends ilObjectAccess
{
	/**
	* checks wether a user may invoke a command or not
	* (this method is called by ilAccessHandler::checkAccess)
	*
	* @param	string		$a_cmd		command (not permission!)
	* @param	string		$a_permission	permission
	* @param	int			$a_ref_id	reference id
	* @param	int			$a_obj_id	object id
	* @param	int			$a_user_id	user id (if not provided, current user is taken)
	*
	* @return	mixed		true, if everything is ok, message (string) when
	*						access is not granted
	*/
	function _checkAccess($a_cmd, $a_permission, $a_ref_id, $a_obj_id, $a_user_id = "")
	{
		global $ilUser, $lng, $rbacsystem, $ilAccess;

		if ($a_user_id == "")
		{
			$a_user_id = $ilUser->getId();
		}

		switch ($a_cmd)
		{
			case "view":

				if(!ilObjGlossaryAccess::_lookupOnline($a_obj_id)
					&& !$rbacsystem->checkAccessOfUser($a_user_id,'write',$a_ref_id))
				{
					$ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
					return false;
				}
				break;
		}

		switch ($a_permission)
		{
			case "visible":
				if (!ilObjGlossaryAccess::_lookupOnline($a_obj_id) &&
					(!$rbacsystem->checkAccessOfUser($a_user_id,'write', $a_ref_id)))
				{
					$ilAccess->addInfoItem(IL_NO_OBJECT_ACCESS, $lng->txt("offline"));
					return false;
				}
				break;
		}


		return true;
	}
	
	/**
	 * get commands
	 * 
	 * this method returns an array of all possible commands/permission combinations
	 * 
	 * example:	
	 * $commands = array
	 *	(
	 *		array("permission" => "read", "cmd" => "view", "lang_var" => "show"),
	 *		array("permission" => "write", "cmd" => "edit", "lang_var" => "edit"),
	 *	);
	 */
	function _getCommands()
	{
		$commands = array
		(
			array("permission" => "read", "cmd" => "view", "lang_var" => "show",
				"default" => true),
			array("permission" => "write", "cmd" => "edit", "lang_var" => "edit"),
		);
		
		return $commands;
	}

	//
	// access relevant methods
	//

	/**
	* check wether learning module is online
	*/
	function _lookupOnline($a_id)
	{
		global $ilDB;

		$q = "SELECT * FROM glossary WHERE id = '".$a_id."'";
		$lm_set = $ilDB->query($q);
		$lm_rec = $lm_set->fetchRow(DB_FETCHMODE_ASSOC);

		return ilUtil::yn2tf($lm_rec["online"]);
	}

	/**
	* check whether goto script will succeed
	*/
	function _checkGoto($a_target)
	{
		global $ilAccess;
		
		$t_arr = explode("_", $a_target);

		if (($t_arr[0] != "glo" && $t_arr[0] != "git") || ((int) $t_arr[1]) <= 0)
		{
			return false;
		}

		if ($t_arr[0] == "glo")
		{
			if ($ilAccess->checkAccess("read", "", $t_arr[1]) ||
				$ilAccess->checkAccess("visible", "", $t_arr[1]))
			{
				return true;
			}
		}

		if ($t_arr[0] == "git")
		{
			if ($t_arr[2] > 0)
			{
				$ref_ids = array($t_arr[2]);
			}
			else
			{
				// determine learning object
				include_once("content/classes/class.ilGlossaryTerm.php");
				$glo_id = ilGlossaryTerm::_lookGlossaryID($t_arr[1]);
				$ref_ids = ilObject::_getAllReferences($glo_id);
			}
			// check read permissions
			foreach ($ref_ids as $ref_id)
			{
				// Permission check
				if ($ilAccess->checkAccess("read", "", $ref_id))
				{
					return true;
				}
			}
		}

		return false;
	}


}

?>
