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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\HttpKernel\EventListener;
use Psr\Container\ContainerInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Cookie;
use Symfony\Component\HttpFoundation\Session\Session;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\HttpFoundation\Session\SessionUtils;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\Exception\UnexpectedSessionUsageException;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Contracts\Service\ResetInterface;
/**
* Sets the session onto the request on the "kernel.request" event and saves
* it on the "kernel.response" event.
*
* In addition, if the session has been started it overrides the Cache-Control
* header in such a way that all caching is disabled in that case.
* If you have a scenario where caching responses with session information in
* them makes sense, you can disable this behaviour by setting the header
* AbstractSessionListener::NO_AUTO_CACHE_CONTROL_HEADER on the response.
*
* @author Johannes M. Schmitt <schmittjoh@gmail.com>
* @author Tobias Schultze <http://tobion.de>
*/
abstract class AbstractSessionListener implements EventSubscriberInterface, ResetInterface
{
public const NO_AUTO_CACHE_CONTROL_HEADER = 'Symfony-Session-NoAutoCacheControl';
/**
* @param array<string, mixed> $sessionOptions
*
* @internal
*/
public function __construct(
private ?ContainerInterface $container = null,
private bool $debug = false,
private array $sessionOptions = [],
) {
}
/**
* @internal
*/
public function onKernelRequest(RequestEvent $event): void
{
if (!$event->isMainRequest()) {
return;
}
$request = $event->getRequest();
if (!$request->hasSession()) {
$request->setSessionFactory(function () use ($request) {
// Prevent calling `$this->getSession()` twice in case the Request (and the below factory) is cloned
static $sess;
if (!$sess) {
$sess = $this->getSession();
$request->setSession($sess);
/*
* For supporting sessions in php runtime with runners like roadrunner or swoole, the session
* cookie needs to be read from the cookie bag and set on the session storage.
*
* Do not set it when a native php session is active.
*/
if ($sess && !$sess->isStarted() && \PHP_SESSION_ACTIVE !== session_status()) {
$sessionId = $sess->getId() ?: $request->cookies->get($sess->getName(), '');
$sess->setId($sessionId);
}
}
return $sess;
});
}
}
/**
* @internal
*/
public function onKernelResponse(ResponseEvent $event): void
{
if (!$event->isMainRequest()) {
return;
}
$response = $event->getResponse();
$autoCacheControl = !$response->headers->has(self::NO_AUTO_CACHE_CONTROL_HEADER);
// Always remove the internal header if present
$response->headers->remove(self::NO_AUTO_CACHE_CONTROL_HEADER);
if (!$event->getRequest()->hasSession(true)) {
return;
}
$session = $event->getRequest()->getSession();
if ($session->isStarted()) {
/*
* Saves the session, in case it is still open, before sending the response/headers.
*
* This ensures several things in case the developer did not save the session explicitly:
*
* * If a session save handler without locking is used, it ensures the data is available
* on the next request, e.g. after a redirect. PHPs auto-save at script end via
* session_register_shutdown is executed after fastcgi_finish_request. So in this case
* the data could be missing the next request because it might not be saved the moment
* the new request is processed.
* * A locking save handler (e.g. the native 'files') circumvents concurrency problems like
* the one above. But by saving the session before long-running things in the terminate event,
* we ensure the session is not blocked longer than needed.
* * When regenerating the session ID no locking is involved in PHPs session design. See
* https://bugs.php.net/61470 for a discussion. So in this case, the session must
* be saved anyway before sending the headers with the new session ID. Otherwise session
* data could get lost again for concurrent requests with the new ID. One result could be
* that you get logged out after just logging in.
*
* This listener should be executed as one of the last listeners, so that previous listeners
* can still operate on the open session. This prevents the overhead of restarting it.
* Listeners after closing the session can still work with the session as usual because
* Symfonys session implementation starts the session on demand. So writing to it after
* it is saved will just restart it.
*/
$session->save();
/*
* For supporting sessions in php runtime with runners like roadrunner or swoole the session
* cookie need to be written on the response object and should not be written by PHP itself.
*/
$sessionName = $session->getName();
$sessionId = $session->getId();
$sessionOptions = $this->getSessionOptions($this->sessionOptions);
$sessionCookiePath = $sessionOptions['cookie_path'] ?? '/';
$sessionCookieDomain = $sessionOptions['cookie_domain'] ?? null;
$sessionCookieSecure = $sessionOptions['cookie_secure'] ?? false;
$sessionCookieHttpOnly = $sessionOptions['cookie_httponly'] ?? true;
$sessionCookieSameSite = $sessionOptions['cookie_samesite'] ?? Cookie::SAMESITE_LAX;
$sessionUseCookies = $sessionOptions['use_cookies'] ?? true;
SessionUtils::popSessionCookie($sessionName, $sessionId);
if ($sessionUseCookies) {
$request = $event->getRequest();
$requestSessionCookieId = $request->cookies->get($sessionName);
$isSessionEmpty = ($session instanceof Session ? $session->isEmpty() : !$session->all()) && empty($_SESSION); // checking $_SESSION to keep compatibility with native sessions
if ($requestSessionCookieId && $isSessionEmpty) {
// PHP internally sets the session cookie value to "deleted" when setcookie() is called with empty string $value argument
// which happens in \Symfony\Component\HttpFoundation\Session\Storage\Handler\AbstractSessionHandler::destroy
// when the session gets invalidated (for example on logout) so we must handle this case here too
// otherwise we would send two Set-Cookie headers back with the response
SessionUtils::popSessionCookie($sessionName, 'deleted');
$response->headers->clearCookie(
$sessionName,
$sessionCookiePath,
$sessionCookieDomain,
$sessionCookieSecure,
$sessionCookieHttpOnly,
$sessionCookieSameSite
);
} elseif ($sessionId !== $requestSessionCookieId && !$isSessionEmpty) {
$expire = 0;
$lifetime = $sessionOptions['cookie_lifetime'] ?? null;
if ($lifetime) {
$expire = time() + $lifetime;
}
$response->headers->setCookie(
Cookie::create(
$sessionName,
$sessionId,
$expire,
$sessionCookiePath,
$sessionCookieDomain,
$sessionCookieSecure,
$sessionCookieHttpOnly,
false,
$sessionCookieSameSite
)
);
}
}
}
if ($session instanceof Session ? 0 === $session->getUsageIndex() : !$session->isStarted()) {
return;
}
if ($autoCacheControl) {
$maxAge = $response->headers->hasCacheControlDirective('public') ? 0 : (int) $response->getMaxAge();
$response
->setExpires(new \DateTimeImmutable('+'.$maxAge.' seconds'))
->setPrivate()
->setMaxAge($maxAge)
->headers->addCacheControlDirective('must-revalidate');
}
if (!$event->getRequest()->attributes->get('_stateless', false)) {
return;
}
if ($this->debug) {
throw new UnexpectedSessionUsageException('Session was used while the request was declared stateless.');
}
if ($this->container->has('logger')) {
$this->container->get('logger')->warning('Session was used while the request was declared stateless.');
}
}
/**
* @internal
*/
public function onSessionUsage(): void
{
if (!$this->debug) {
return;
}
if ($this->container?->has('session_collector')) {
$this->container->get('session_collector')();
}
if (!$requestStack = $this->container?->has('request_stack') ? $this->container->get('request_stack') : null) {
return;
}
$stateless = false;
$clonedRequestStack = clone $requestStack;
while (null !== ($request = $clonedRequestStack->pop()) && !$stateless) {
$stateless = $request->attributes->get('_stateless');
}
if (!$stateless) {
return;
}
if (!$session = $requestStack->getCurrentRequest()->getSession()) {
return;
}
if ($session->isStarted()) {
$session->save();
}
throw new UnexpectedSessionUsageException('Session was used while the request was declared stateless.');
}
/**
* @internal
*/
public static function getSubscribedEvents(): array
{
return [
KernelEvents::REQUEST => ['onKernelRequest', 128],
// low priority to come after regular response listeners
KernelEvents::RESPONSE => ['onKernelResponse', -1000],
];
}
/**
* @internal
*/
public function reset(): void
{
if (\PHP_SESSION_ACTIVE === session_status()) {
session_abort();
}
session_unset();
$_SESSION = [];
if (!headers_sent()) { // session id can only be reset when no headers were so we check for headers_sent first
session_id('');
}
}
/**
* Gets the session object.
*
* @internal
*/
abstract protected function getSession(): ?SessionInterface;
private function getSessionOptions(array $sessionOptions): array
{
$mergedSessionOptions = [];
foreach (session_get_cookie_params() as $key => $value) {
$mergedSessionOptions['cookie_'.$key] = $value;
}
foreach ($sessionOptions as $key => $value) {
// do the same logic as in the NativeSessionStorage
if ('cookie_secure' === $key && 'auto' === $value) {
continue;
}
$mergedSessionOptions[$key] = $value;
}
return $mergedSessionOptions;
}
}