/usr/share/php/Symfony/Component/HttpFoundation/Session/Storage/Handler/AbstractSessionHandler.php is in php-symfony-http-foundation 3.4.6+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* 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;
/**
* 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 $sessionName;
private $prefetchId;
private $prefetchData;
private $newSessionId;
private $igbinaryEmptyData;
/**
* {@inheritdoc}
*/
public function open($savePath, $sessionName)
{
$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;
}
/**
* @param string $sessionId
*
* @return string
*/
abstract protected function doRead($sessionId);
/**
* @param string $sessionId
* @param string $data
*
* @return bool
*/
abstract protected function doWrite($sessionId, $data);
/**
* @param string $sessionId
*
* @return bool
*/
abstract protected function doDestroy($sessionId);
/**
* {@inheritdoc}
*/
public function validateId($sessionId)
{
$this->prefetchData = $this->read($sessionId);
$this->prefetchId = $sessionId;
return '' !== $this->prefetchData;
}
/**
* {@inheritdoc}
*/
public function read($sessionId)
{
if (null !== $this->prefetchId) {
$prefetchId = $this->prefetchId;
$prefetchData = $this->prefetchData;
$this->prefetchId = $this->prefetchData = null;
if ($prefetchId === $sessionId || '' === $prefetchData) {
$this->newSessionId = '' === $prefetchData ? $sessionId : null;
return $prefetchData;
}
}
$data = $this->doRead($sessionId);
$this->newSessionId = '' === $data ? $sessionId : null;
if (\PHP_VERSION_ID < 70000) {
$this->prefetchData = $data;
}
return $data;
}
/**
* {@inheritdoc}
*/
public function write($sessionId, $data)
{
if (\PHP_VERSION_ID < 70000 && $this->prefetchData) {
$readData = $this->prefetchData;
$this->prefetchData = null;
if ($readData === $data) {
return $this->updateTimestamp($sessionId, $data);
}
}
if (null === $this->igbinaryEmptyData) {
// see https://github.com/igbinary/igbinary/issues/146
$this->igbinaryEmptyData = \function_exists('igbinary_serialize') ? igbinary_serialize(array()) : '';
}
if ('' === $data || $this->igbinaryEmptyData === $data) {
return $this->destroy($sessionId);
}
$this->newSessionId = null;
return $this->doWrite($sessionId, $data);
}
/**
* {@inheritdoc}
*/
public function destroy($sessionId)
{
if (\PHP_VERSION_ID < 70000) {
$this->prefetchData = null;
}
if (!headers_sent() && ini_get('session.use_cookies')) {
if (!$this->sessionName) {
throw new \LogicException(sprintf('Session name cannot be empty, did you forget to call "parent::open()" in "%s"?.', get_class($this)));
}
$sessionCookie = sprintf(' %s=', urlencode($this->sessionName));
$sessionCookieWithId = sprintf('%s%s;', $sessionCookie, urlencode($sessionId));
$sessionCookieFound = false;
$otherCookies = array();
foreach (headers_list() as $h) {
if (0 !== stripos($h, 'Set-Cookie:')) {
continue;
}
if (11 === strpos($h, $sessionCookie, 11)) {
$sessionCookieFound = true;
if (11 !== strpos($h, $sessionCookieWithId, 11)) {
$otherCookies[] = $h;
}
} else {
$otherCookies[] = $h;
}
}
if ($sessionCookieFound) {
header_remove('Set-Cookie');
foreach ($otherCookies as $h) {
header($h, false);
}
} else {
setcookie($this->sessionName, '', 0, ini_get('session.cookie_path'), ini_get('session.cookie_domain'), ini_get('session.cookie_secure'), ini_get('session.cookie_httponly'));
}
}
return $this->newSessionId === $sessionId || $this->doDestroy($sessionId);
}
}
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