Session.inc
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<?php
/**
* $Id$
*
* Session management class.
*
* Copyright (c) 2006 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; using version 2 of the License.
*
* 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 $Revision$
*/
class Session {
var $_bNotEmpty = true;
/**
* Creates a session.
*
* @param int the id of the user to create a session for
* @return string the generated sessionID
*/
function create(&$oUser) {
$iUserId = $oUser->getId();
global $default;
session_start();
// bind user id to session
$_SESSION["userID"] = $iUserId;
$_SESSION["KTErrorMessage"] = array();
// 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
$aParams = array(
'session_id' => $sessionID,
'user_id' => $iUserId,
'lastused' => date("Y-m-d H:i:s", time()),
'ip' => $ip,
);
$result = DBUtil::autoInsert($default->sessions_table, $aParams);
if (PEAR::isError($result)) {
die("Error creating session: " . $result->toString());
}
$aParams = array(
'userid' => $iUserId,
'datetime' => date("Y-m-d H:i:s", time()),
'actionnamespace' => 'ktcore.user_history.login',
'comments' => sprintf('Logged in from %s', $ip),
);
require_once(KT_LIB_DIR . '/users/userhistory.inc.php');
$res = KTUserHistory::createFromArray($aParams);
$default->log->info("saving user history - " . print_r($res, true));
$oUser->setLastLogin(getCurrentDateTime());
$oUser->update();
$oProvider =& KTAuthenticationUtil::getAuthenticationProviderForUser($oUser);
$oProvider->login($oUser);
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
$sTable = KTUtil::getTableName('sessions');
$res = DBUtil::whereDelete($sTable, array('session_id' => $sSessionID));
// remove the php4 session
unset($_SESSION['userID']);
unset($_SESSION['sessionStatus']);
session_unset();
session_destroy();
}
/**
* Removes any stale sessions for the specified userID
*
* @param int the userID to remove stale sessions for
*/
function removeStaleSessions($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.
*
* @param boolean optional parameter set if we're downloading a file
* @return int session verification status
*/
function verify() {
global $default;
// this is a workaround for an SSL download bug with IE.
session_cache_limiter('none');
session_start();
header("Cache-Control: must-revalidate");
header("Expires: " . gmdate("D, d M Y H:i:s", time() - 3600) . " GMT");
$sessionID = session_id();
if (empty($sessionID)) {
$default->log->info("Session::verify session not in db");
return PEAR::raiseError('You need to login to access this page');
}
// this should be an existing session, so check the db
$aRows = DBUtil::getResultArray(array("SELECT * FROM $default->sessions_table WHERE session_id = ?", $sessionID));
$numrows = count($aRows);
// FIXME: if there aren't more rows that the max sessions for this user
if ($numrows < 1) {
// the session doesn't exist in the db
$default->log->info("Session::verify sessionID=$sessionID, not in db");
return PEAR::raiseError('You need to login to access this page');
return false;
}
$default->log->debug("Session::verify found session in db");
$aRow = $aRows[0];
$iUserID = $aRow["user_id"];
$oKTConfig = KTConfig::getSingleton();
$allowAnon = $oKTConfig->get('session/allowAnonymousLogin', false);
$ANON = -2;
if ((!$allowAnon) && ($iUserId == $ANON)) { return false; }
$ipTracking = $oKTConfig->get('session/ipTracking', false);
// check that ip matches
$ip = $this->getClientIP();
if ($ipTracking && ($ip != trim($aRow["ip"]))) {
return PEAR::raiseError("You are coming from a different IP address than the session requires");
}
// now check if the timeout has been exceeded
$lastused = $aRow["lastused"];
$diff = time() - strtotime($lastused);
if($diff <= $default->sessionTimeout) {
// update last used timestamp
$aFV = array(
'lastused' => getCurrentDateTime(),
);
$aWFV = array(
'user_id' => $iUserID,
'session_id' => $sessionID,
);
$res = DBUtil::whereUpdate($default->sessions_table, $aFV, $aWFV);
// add the array to the session
$_SESSION["sessionStatus"] = $sessionStatus;
Session::removeStaleSessions();
return true;
} else {
return PEAR::raiseError('Session timed out');
}
// }
Session::removeStaleSessions();
return false;
}
/**
* 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;
}
}
?>