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<?php
namespace App\Helpers;
use App\Core\Database;
class SessionHelper
{
public static function register() {
session_set_save_handler(
array('App\Helpers\SessionHelper', 'open'), array('App\Helpers\SessionHelper', 'close'), array('App\Helpers\SessionHelper', 'read'), array('App\Helpers\SessionHelper', 'write'), array('App\Helpers\SessionHelper', 'destroy'), array('App\Helpers\SessionHelper', 'gc')
);
// the following prevents unexpected effects when using objects as save handlers
register_shutdown_function('session_write_close');
}
public static function open() {
$db = Database::getDatabase(true);
return $db->isConnected();
}
public static function close() {
return true;
}
public static function read($id) {
// @TODO - do we need 'true' in this call?
$db = Database::getDatabase(true);
$db->query('SELECT `data` '
. 'FROM `sessions` '
. 'WHERE `id` = :id '
. 'LIMIT 1', array(
'id' => $id,
)
);
return $db->hasRows() ? $db->getValue() : '';
}
public static function write($id, $data) {
// load user id if the user is logged in
$userId = null;
$Auth = AuthHelper::getAuth();
if ($Auth->loggedIn()) {
$userId = $Auth->id;
}
$db = Database::getDatabase(true);
$db->query('INSERT INTO `sessions` '
. '(`id`, `data`, `updated_on`, `user_id`) '
. 'VALUES '
. '(:id, :data, :updated_on, :user_id) '
. 'ON DUPLICATE KEY UPDATE data=:data, updated_on=:updated_on, user_id=:user_id', array(
'id' => $id,
'data' => $data,
'updated_on' => time(),
'user_id' => $userId,
));
return true;
}
public static function destroy($id) {
$db = Database::getDatabase(true);
$db->query('DELETE FROM `sessions` '
. 'WHERE `id` = :id '
. 'LIMIT 1', array(
'id' => $id,
));
return true;
}
/*
* $max set in php.ini with session.gc-maxlifetime
*/
public static function gc($max) {
// max override due to issues on certain server installs
$max = 60 * 60 * 24 * 14;
$db = Database::getDatabase(true);
$db->query('DELETE FROM `sessions` '
. 'WHERE `updated_on` < :updated_on', array(
'updated_on' => time() - $max,
));
return true;
}
/**
* Clears any existing sessions associated with a user
*
* @param type $userId
*/
public static function clearSessionByUserId($userId) {
// deletes any existing sessions for the same user id
if ((SITE_CONFIG_PREMIUM_USER_BLOCK_ACCOUNT_SHARING == 'yes') && CoreHelper::currentIsMainSite()) {
$db = Database::getDatabase();
$db->query('DELETE FROM sessions '
. 'WHERE user_id = :id', array(
'id' => $userId,
));
}
}
/**
* Used to clear the session if the script needs to run for a long time, for
* example on download. Avoids session locks which means the browser becomes
* unresponsive for a period of time.
*/
public static function releaseSession() {
session_write_close();
}
}