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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpFoundation\Session\Storage\Handler;
use Symfony\Component\HttpFoundation\Session\SessionUtils;
/**
* This abstract session handler provides a generic implementation
* of the PHP 7.0 SessionUpdateTimestampHandlerInterface,
* enabling strict and lazy session handling.
*
* @author Nicolas Grekas <p@tchwork.com>
*/
abstract class AbstractSessionHandler implements \SessionHandlerInterface, \SessionUpdateTimestampHandlerInterface
{
private string $sessionName;
private string $prefetchId;
private string $prefetchData;
private ?string $newSessionId = null;
private string $igbinaryEmptyData;
public function open(string $savePath, string $sessionName): bool
{
$this->sessionName = $sessionName;
if (!headers_sent() && !\ini_get('session.cache_limiter') && '0' !== \ini_get('session.cache_limiter')) {
header(sprintf('Cache-Control: max-age=%d, private, must-revalidate', 60 * (int) \ini_get('session.cache_expire')));
}
return true;
}
abstract protected function doRead(string $sessionId): string;
abstract protected function doWrite(string $sessionId, string $data): bool;
abstract protected function doDestroy(string $sessionId): bool;
public function validateId(string $sessionId): bool
{
$this->prefetchData = $this->read($sessionId);
$this->prefetchId = $sessionId;
return '' !== $this->prefetchData;
}
public function read(string $sessionId): string
{
if (isset($this->prefetchId)) {
$prefetchId = $this->prefetchId;
$prefetchData = $this->prefetchData;
unset($this->prefetchId, $this->prefetchData);
if ($prefetchId === $sessionId || '' === $prefetchData) {
$this->newSessionId = '' === $prefetchData ? $sessionId : null;
return $prefetchData;
}
}
$data = $this->doRead($sessionId);
$this->newSessionId = '' === $data ? $sessionId : null;
return $data;
}
public function write(string $sessionId, string $data): bool
{
// see https://github.com/igbinary/igbinary/issues/146
$this->igbinaryEmptyData ??= \function_exists('igbinary_serialize') ? igbinary_serialize([]) : '';
if ('' === $data || $this->igbinaryEmptyData === $data) {
return $this->destroy($sessionId);
}
$this->newSessionId = null;
return $this->doWrite($sessionId, $data);
}
public function destroy(string $sessionId): bool
{
if (!headers_sent() && filter_var(\ini_get('session.use_cookies'), \FILTER_VALIDATE_BOOL)) {
if (!isset($this->sessionName)) {
throw new \LogicException(sprintf('Session name cannot be empty, did you forget to call "parent::open()" in "%s"?.', static::class));
}
$cookie = SessionUtils::popSessionCookie($this->sessionName, $sessionId);
/*
* We send an invalidation Set-Cookie header (zero lifetime)
* when either the session was started or a cookie with
* the session name was sent by the client (in which case
* we know it's invalid as a valid session cookie would've
* started the session).
*/
if (null === $cookie || isset($_COOKIE[$this->sessionName])) {
$params = session_get_cookie_params();
unset($params['lifetime']);
setcookie($this->sessionName, '', $params);
}
}
return $this->newSessionId === $sessionId || $this->doDestroy($sessionId);
}
}
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