<?php
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/*
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Copyright (c) 2010, Till Brehm, projektfarm Gmbh
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of ISPConfig nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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class session {
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private $session_array = array();
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private $db;
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private $timeout = 0;
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private $permanent = false;
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function __construct($session_timeout = 0) {
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$this->db = new db;
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$this->timeout = $session_timeout;
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}
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function set_timeout($session_timeout = 0) {
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$old_timeout = $this->timeout;
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$this->timeout = $session_timeout;
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return $old_timeout;
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}
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function set_permanent($value = false) {
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$this->permanent = $value;
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}
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function open ($save_path, $session_name) {
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return true;
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}
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function close () {
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if (!empty($this->session_array)) {
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$result = $this->gc(ini_get('session.gc_maxlifetime'));
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return $result;
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}
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return false;
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}
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function read ($session_id) {
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if($this->timeout > 0) {
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$rec = $this->db->queryOneRecord("SELECT * FROM sys_session WHERE session_id = ? AND (`permanent` = 'y' OR last_updated >= DATE_SUB(NOW(), INTERVAL ? MINUTE))", $session_id, $this->timeout);
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} else {
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$rec = $this->db->queryOneRecord("SELECT * FROM sys_session WHERE session_id = ?", $session_id);
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}
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if (is_array($rec)) {
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$this->session_array = $rec;
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return $this->session_array['session_data'];
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} else {
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return '';
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}
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}
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function write ($session_id, $session_data) {
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if (!empty($this->session_array) && $this->session_array['session_id'] != $session_id) {
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$this->session_array = array();
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}
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// Dont write session_data to DB if session data has not been changed after reading it.
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if(isset($this->session_array['session_data']) && $this->session_array['session_data'] != '' && $this->session_array['session_data'] == $session_data) {
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$this->db->query("UPDATE sys_session SET last_updated = NOW() WHERE session_id = ?", $session_id);
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return true;
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}
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if (@$this->session_array['session_id'] == '') {
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$sql = "REPLACE INTO sys_session (session_id,date_created,last_updated,session_data,permanent) VALUES (?,NOW(),NOW(),?,?)";
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$this->db->query($sql, $session_id, $session_data, ($this->permanent ? 'y' : 'n'));
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} else {
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$sql = "UPDATE sys_session SET last_updated = NOW(), session_data = ?" . ($this->permanent ? ", `permanent` = 'y'" : "") . " WHERE session_id = ?";
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$this->db->query($sql, $session_data, $session_id);
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}
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return true;
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}
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function destroy ($session_id) {
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$sql = "DELETE FROM sys_session WHERE session_id = ?";
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$this->db->query($sql, $session_id);
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return true;
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}
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function gc ($max_lifetime) {
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$sql = "DELETE FROM sys_session WHERE last_updated < DATE_SUB(NOW(), INTERVAL ? SECOND) AND `permanent` != 'y'";
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$this->db->query($sql, intval($max_lifetime));
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/* delete very old even if they are permanent */
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$sql = "DELETE FROM sys_session WHERE last_updated < DATE_SUB(NOW(), INTERVAL 1 YEAR)";
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$this->db->query($sql);
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return true;
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}
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function __destruct () {
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@session_write_close();
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}
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}
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?>
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