Session.inc
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<?php
/**
* $Id$
*
* Session management class.
*
* Copyright (c) 2003 Jam Warehouse http://www.jamwarehouse.com
*
* 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
*
* @version $Revision$
* @author Michael Joseph <michael@jamwarehouse.com>, Jam Warehouse (Pty) Ltd, South Africa
* @package lib.session
*/
class Session {
/**
* Creates a session.
*
* @param int the id of the user to create a session for
* @return string the generated sessionID
*/
function create($iUserID) {
global $default;
session_start();
// bind user id to session
$_SESSION["userID"] = $iUserID;
// use the PHP generated session id
$sessionID = session_id();
// retrieve client ip
$ip = $this->getClientIP();
$default->log->debug("Session::create() new session for $iUserID, from $ip, sessionID=$sessionID");
// insert session information into db
$sql = $default->db;
$query = "INSERT INTO $default->sessions_table (session_id, user_id, lastused, ip) VALUES ('$sessionID', $iUserID, '" . date("Y-m-d H:i:s", time()) . "', '$ip')";
$result = $sql->query($query);
if(!$result) {
die("$lang_err_sess_write");
}
return $sessionID;
}
/**
* Destroys the current session.
*/
function destroy() {
global $default;
session_start();
$sSessionID = session_id();
$iUserID = $_SESSION["userID"];
// remove the session information from the database
$sql = $default->db;
$query = "DELETE FROM $default->sessions_table WHERE session_id = '$sSessionID' AND user_id=$iUserID";
$default->log->info("Session::destroy $query");
$sql->query($query);
// remove the php4 session
session_unset();
session_destroy();
}
/**
* Removes any stale sessions for the specified userID
*
* @param int the userID to remove stale sessions for
*/
function removeStaleSessions($userID = -1) {
global $default;
// deletes any sessions for this userID where the default timeout has elapsed.
$time = time() - $default->sessionTimeout;
$sql = $default->db;
$sQuery = "DELETE FROM $default->sessions_table WHERE " . (($userID != -1) ? "user_id=$userID AND " : "") . "lastused <= '" . formatDateTime($time) . "'";
$sql->query($sQuery);
}
/**
* Used to verify the current user's session.
*
* @return int session verification status
*/
function verify() {
global $default, $lang_sesstimeout, $lang_sessinuse, $lang_err_sess_notvalid;
session_start();
$sessionID = session_id();
if (strlen($sessionID) > 0) {
// initialise return status
$sessionStatus = 0;
// this should be an existing session, so check the db
$sql = $default->db;
$sql->query("SELECT * FROM $default->sessions_table WHERE session_id = '$sessionID'");
$numrows = $sql->num_rows($sql);
// FIXME: if there aren't more rows that the max sessions for this user
if ($numrows >= 1) {
$default->log->debug("Session::verify found session in db");
while($sql->next_record()) {
$iUserID = $sql->f("user_id");
$ip = $this->getClientIP();
// check that ip matches
if ($ip == $sql->f("ip")) {
// now check if the timeout has been exceeded
$lastused = $sql->f("lastused");
$diff = time() - strtotime($lastused);
if($diff <= $default->sessionTimeout) {
// session has been verified, update status
$sessionStatus = 1;
// use userID to refresh user details and set on session
// ??: will this change during a user session?
// only set the userID if its not in the array already
if (!$_SESSION["userID"]) {
$_SESSION["userID"] = $iUserID;
}
// update last used timestamp
$sql->query("UPDATE $default->sessions_table SET lastused = '" . getCurrentDateTime() ."' " .
"WHERE user_id = $iUserID AND session_id = '$sessionID'");
// add the array to the session
$_SESSION["sessionStatus"] = $sessionStatus;
} else {
// session timed out status
$sessionStatus = 2;
// destroy this session
$this->destroy();
$_SESSION["errorMessage"] = $lang_sesstimeout;
}
} else {
// session in use status
$sessionStatus = 3;
$_SESSION["errorMessage"] = $lang_sessinuse;
}
}
} else {
// the session doesn't exist in the db
$default->log->error("Session::verify sessionID=$sessionID, not in db");
$sessionStatus = false;
}
} else {
$default->log->error("Session::verify session not in db");
// there is no session
$sessionStatus = false;
}
// remove old sessions
Session::removeStaleSessions();
// return the status
return $sessionStatus;
}
/**
* Retrieves and returns the IP address of the current user
*/
function getClientIP() {
// get client ip
if (getenv("REMOTE_ADDR")) {
$ip = getenv("REMOTE_ADDR");
} elseif(getenv("HTTP_X_FORWARDED_FOR")) {
$forwardedip = getenv("HTTP_X_FORWARDED_FOR");
list($ip,$ip2,$ip3,$ip4)= split (",", $forwardedip);
} elseif (getenv("HTTP_CLIENT_IP")) {
$ip = getenv("HTTP_CLIENT_IP");
}
return $ip;
}
}
?>