Symfony Profiler

<?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\Bundle\WebProfilerBundle\EventListener;
use Symfony\Bundle\WebProfilerBundle\Csp\ContentSecurityPolicyHandler;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Session\Flash\AutoExpireFlashBag;
use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
use Twig\Environment;
/**
* WebDebugToolbarListener injects the Web Debug Toolbar.
*
* The onKernelResponse method must be connected to the kernel.response event.
*
* The WDT is only injected on well-formed HTML (with a proper </body> tag).
* This means that the WDT is never included in sub-requests or ESI requests.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class WebDebugToolbarListener implements EventSubscriberInterface
{
const DISABLED = 1;
const ENABLED = 2;
protected $twig;
protected $urlGenerator;
protected $interceptRedirects;
protected $mode;
protected $position;
protected $excludedAjaxPaths;
private $cspHandler;
public function __construct(Environment $twig, $interceptRedirects = false, $mode = self::ENABLED, $position = 'bottom', UrlGeneratorInterface $urlGenerator = null, $excludedAjaxPaths = '^/bundles|^/_wdt', ContentSecurityPolicyHandler $cspHandler = null)
{
$this->twig = $twig;
$this->urlGenerator = $urlGenerator;
$this->interceptRedirects = (bool) $interceptRedirects;
$this->mode = (int) $mode;
$this->position = $position;
$this->excludedAjaxPaths = $excludedAjaxPaths;
$this->cspHandler = $cspHandler;
}
public function isEnabled()
{
return self::DISABLED !== $this->mode;
}
public function onKernelResponse(FilterResponseEvent $event)
{
$response = $event->getResponse();
$request = $event->getRequest();
if ($response->headers->has('X-Debug-Token') && null !== $this->urlGenerator) {
try {
$response->headers->set(
'X-Debug-Token-Link',
$this->urlGenerator->generate('_profiler', ['token' => $response->headers->get('X-Debug-Token')], UrlGeneratorInterface::ABSOLUTE_URL)
);
} catch (\Exception $e) {
$response->headers->set('X-Debug-Error', \get_class($e).': '.preg_replace('/\s+/', ' ', $e->getMessage()));
}
}
if (!$event->isMasterRequest()) {
return;
}
$nonces = $this->cspHandler ? $this->cspHandler->updateResponseHeaders($request, $response) : [];
// do not capture redirects or modify XML HTTP Requests
if ($request->isXmlHttpRequest()) {
return;
}
if ($response->headers->has('X-Debug-Token') && $response->isRedirect() && $this->interceptRedirects && 'html' === $request->getRequestFormat()) {
$session = $request->getSession();
if (null !== $session && $session->isStarted() && $session->getFlashBag() instanceof AutoExpireFlashBag) {
// keep current flashes for one more request if using AutoExpireFlashBag
$session->getFlashBag()->setAll($session->getFlashBag()->peekAll());
}
$response->setContent($this->twig->render('@WebProfiler/Profiler/toolbar_redirect.html.twig', ['location' => $response->headers->get('Location')]));
$response->setStatusCode(200);
$response->headers->remove('Location');
}
if (self::DISABLED === $this->mode
|| !$response->headers->has('X-Debug-Token')
|| $response->isRedirection()
|| ($response->headers->has('Content-Type') && false === strpos($response->headers->get('Content-Type'), 'html'))
|| 'html' !== $request->getRequestFormat()
|| false !== stripos($response->headers->get('Content-Disposition'), 'attachment;')
) {
return;
}
$this->injectToolbar($response, $request, $nonces);
}
/**
* Injects the web debug toolbar into the given Response.
*/
protected function injectToolbar(Response $response, Request $request, array $nonces)
{
$content = $response->getContent();
$pos = strripos($content, '</body>');
if (false !== $pos) {
$toolbar = "\n".str_replace("\n", '', $this->twig->render(
'@WebProfiler/Profiler/toolbar_js.html.twig',
[
'position' => $this->position,
'excluded_ajax_paths' => $this->excludedAjaxPaths,
'token' => $response->headers->get('X-Debug-Token'),
'request' => $request,
'csp_script_nonce' => isset($nonces['csp_script_nonce']) ? $nonces['csp_script_nonce'] : null,
'csp_style_nonce' => isset($nonces['csp_style_nonce']) ? $nonces['csp_style_nonce'] : null,
]
))."\n";
$content = substr($content, 0, $pos).$toolbar.substr($content, $pos);
$response->setContent($content);
}
}
public static function getSubscribedEvents()
{
return [
KernelEvents::RESPONSE => ['onKernelResponse', -128],
];
}
}

vendor/symfony/symfony/src/Symfony/Bundle/WebProfilerBundle/EventListener/WebDebugToolbarListener.php line 63