class.ilObjSessionAccess.php

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<?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 './Services/Object/classes/class.ilObjectAccess.php';

class ilObjSessionAccess extends ilObjectAccess
{
    protected static $registrations = null;
    protected static $registered = null;

    public static function _getCommands()
    {
        $commands = array(
            array("permission" => "read", "cmd" => "infoScreen", "lang_var" => "info_short", "default" => true),
            array("permission" => "read", "cmd" => "register", "lang_var" => "join_session"),
            array("permission" => "read", "cmd" => "unregister", "lang_var" => "event_unregister"),
            array("permission" => "write", "cmd" => "edit", "lang_var" => "settings"),
            array("permission" => "write", "cmd" => "materials", "lang_var" => "crs_objective_add_mat"),
            array('permission' => 'write', 'cmd' => 'members', 'lang_var' => 'event_edit_members')
        );
        
        return $commands;
    }

    public 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();
        }
        include_once './Modules/Session/classes/class.ilSessionParticipants.php';
        $part = ilSessionParticipants::getInstance($a_ref_id);
        
        switch ($a_cmd) {
            case 'register':
                
                if (!self::_lookupRegistration($a_obj_id)) {
                    //ilLoggerFactory::getLogger('sess')->debug('Lookup registration failed: register access denied.');
                    return false;
                }
                if ($ilUser->isAnonymous()) {
                    //ilLoggerFactory::getLogger('sess')->debug('User is anoynmous: register access denied.');
                    return false;
                }
                if ($part->isAssigned($a_user_id)) {
                    //ilLoggerFactory::getLogger('sess')->debug('User is assigned: register access denied.');
                    return false;
                }
                if ($part->isSubscriber($a_user_id)) {
                    //ilLoggerFactory::getLogger('sess')->debug('User is subscriber: register access denied.');
                    return false;
                }
                include_once './Modules/Session/classes/class.ilSessionWaitingList.php';
                if (ilSessionWaitingList::_isOnList($a_user_id, $a_obj_id)) {
                    //ilLoggerFactory::getLogger('sess')->debug('User is on waiting list: register access denied.');
                    return false;
                }
                break;
                
            case 'unregister':
                if (self::_lookupRegistration($a_obj_id) && $a_user_id != ANONYMOUS_USER_ID) {
                    return self::_lookupRegistered($a_user_id, $a_obj_id);
                }
                return false;
        }
        return true;
    }
    
    
    public static function _checkGoto($a_target)
    {
        global $ilAccess;
        
        $t_arr = explode("_", $a_target);

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

        if ($ilAccess->checkAccess("read", "", $t_arr[1])) {
            return true;
        }
        return false;
    }
    
    public static function _lookupRegistration($a_obj_id)
    {
        if (!is_null(self::$registrations)) {
            return self::$registrations[$a_obj_id];
        }
        
        global $ilDB;
        
        $query = "SELECT registration,obj_id FROM event ";
        $res = $ilDB->query($query);
        while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
            self::$registrations[$row->obj_id] = (bool) $row->registration;
        }
        return self::$registrations[$a_obj_id];
    }
    
    public static function _lookupRegistered($a_usr_id, $a_obj_id)
    {
        if (isset(self::$registered[$a_usr_id])) {
            return (bool) self::$registered[$a_usr_id][$a_obj_id];
        }
        
        global $ilDB,$ilUser;
        
        $query = "SELECT event_id, registered FROM event_participants WHERE usr_id = " . $ilDB->quote($ilUser->getId(), 'integer');
        $res = $ilDB->query($query);
        self::$registered[$a_usr_id] = array();
        while ($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT)) {
            self::$registered[$a_usr_id][$row->event_id] = (bool) $row->registered;
        }
        return (bool) self::$registered[$a_usr_id][$a_obj_id];
    }
}