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.
/**
* File based session handler.
*
* @package core
* @copyright 2013 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core\session;
defined('MOODLE_INTERNAL') || die();
/**
* File based session handler.
*
* @package core
* @copyright 2013 Petr Skoda {@link http://skodak.org}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
class file extends handler {
/** @var string session dir */
protected $sessiondir;
/**
* Create new instance of handler.
*/
public function __construct() {
global $CFG;
if (!empty($CFG->session_file_save_path)) {
$this->sessiondir = $CFG->session_file_save_path;
} else {
$this->sessiondir = "$CFG->dataroot/sessions";
}
}
/**
* Init session handler.
*/
public function init() {
if (preg_match('/^[0-9]+;/', $this->sessiondir)) {
throw new exception('sessionhandlerproblem', 'error', '', null, 'Multilevel session directories are not supported');
}
// Make sure session directory exists and is writable.
make_writable_directory($this->sessiondir, false);
if (!is_writable($this->sessiondir)) {
throw new exception('sessionhandlerproblem', 'error', '', null, 'Session directory is not writable');
}
// Need to disable debugging since disk_free_space()
// will fail on very large partitions (see MDL-19222).
$freespace = @disk_free_space($this->sessiondir);
// MDL-43039: disk_free_space() returns null if disabled.
if (!($freespace > 2048) and ($freespace !== false) and ($freespace !== null)) {
throw new exception('sessiondiskfull', 'error');
}
// NOTE: we cannot set any lock acquiring timeout here - bad luck.
ini_set('session.save_handler', 'files');
ini_set('session.save_path', $this->sessiondir);
}
/**
* Check the backend contains data for this session id.
*
* Note: this is intended to be called from manager::session_exists() only.
*
* @param string $sid
* @return bool true if session found.
*/
public function session_exists($sid) {
$sid = clean_param($sid, PARAM_FILE);
if (!$sid) {
return false;
}
$sessionfile = "$this->sessiondir/sess_$sid";
return file_exists($sessionfile);
}
/**
* Kill all active sessions, the core sessions table is
* purged afterwards.
*/
public function kill_all_sessions() {
if (is_dir($this->sessiondir)) {
foreach (glob("$this->sessiondir/sess_*") as $filename) {
@unlink($filename);
}
}
}
/**
* Kill one session, the session record is removed afterwards.
* @param string $sid
*/
public function kill_session($sid) {
$sid = clean_param($sid, PARAM_FILE);
if (!$sid) {
return;
}
$sessionfile = "$this->sessiondir/sess_$sid";
if (file_exists($sessionfile)) {
@unlink($sessionfile);
}
}
}