<?php

/*
 * Copyright (C) 2004 ReiniUrban
 *
 * This file is part of PhpWiki.
 *
 * PhpWiki 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.
 *
 * PhpWiki 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 PhpWiki; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/**
 * Support reuse of existing user session from another application.
 * You have to define which session variable holds the userid, and
 * at what level is that user then. 1: BogoUser, 2: PassUser
 *   define('AUTH_SESS_USER','userid');
 *   define('AUTH_SESS_LEVEL',2);
 */
class _SessionPassUser
    extends _PassUser
{
    function _SessionPassUser($UserName = '', $prefs = false)
    {
        if ($prefs) $this->_prefs = $prefs;
        if (!defined("AUTH_SESS_USER") or !defined("AUTH_SESS_LEVEL")) {
            trigger_error(
                "AUTH_SESS_USER or AUTH_SESS_LEVEL is not defined for the SessionPassUser method",
                E_USER_ERROR);
            exit;
        }
        $sess =& $GLOBALS['HTTP_SESSION_VARS'];
        // user hash: "[user][userid]" or object "user->id"
        if (strstr(AUTH_SESS_USER, "][")) {
            $sess = $GLOBALS['HTTP_SESSION_VARS'];
            // recurse into hashes: "[user][userid]", sess = sess[user] => sess = sess[userid]
            foreach (explode("][", AUTH_SESS_USER) as $v) {
                $v = str_replace(array("[", "]"), '', $v);
                $sess = $sess[$v];
            }
            $this->_userid = $sess;
        } elseif (strstr(AUTH_SESS_USER, "->")) {
            // object "user->id" (no objects inside hashes supported!)
            list($obj, $key) = explode("->", AUTH_SESS_USER);
            $this->_userid = $sess[$obj]->$key;
        } else {
            $this->_userid = $sess[AUTH_SESS_USER];
        }
        if (!isset($this->_prefs->_method))
            _PassUser::_PassUser($this->_userid);
        $this->_level = AUTH_SESS_LEVEL;
        $this->_authmethod = 'Session';
    }

    function userExists()
    {
        return !empty($this->_userid);
    }

    function checkPass($submitted_password)
    {
        return $this->userExists() and $this->_level > -1;
    }

    function mayChangePass()
    {
        return false;
    }
}

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