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\Component\HttpKernel\EventListener;
use Psr\Log\LoggerInterface;
use Symfony\Component\Debug\Exception\FlattenException as LegacyFlattenException;
use Symfony\Component\ErrorHandler\Exception\FlattenException;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Event\ControllerArgumentsEvent;
use Symfony\Component\HttpKernel\Event\ExceptionEvent;
use Symfony\Component\HttpKernel\Event\ResponseEvent;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\HttpKernel\Log\DebugLoggerInterface;
/**
* @author Fabien Potencier <fabien@symfony.com>
*/
class ErrorListener implements EventSubscriberInterface
{
protected $controller;
protected $logger;
protected $debug;
/**
* @var array<class-string, array{log_level: string|null, status_code: int<100,599>|null}>
*/
protected $exceptionsMapping;
/**
* @param array<class-string, array{log_level: string|null, status_code: int<100,599>|null}> $exceptionsMapping
*/
public function __construct($controller, ?LoggerInterface $logger = null, bool $debug = false, array $exceptionsMapping = [])
{
$this->controller = $controller;
$this->logger = $logger;
$this->debug = $debug;
$this->exceptionsMapping = $exceptionsMapping;
}
public function logKernelException(ExceptionEvent $event)
{
$throwable = $event->getThrowable();
$logLevel = null;
foreach ($this->exceptionsMapping as $class => $config) {
if ($throwable instanceof $class && $config['log_level']) {
$logLevel = $config['log_level'];
break;
}
}
foreach ($this->exceptionsMapping as $class => $config) {
if (!$throwable instanceof $class || !$config['status_code']) {
continue;
}
if (!$throwable instanceof HttpExceptionInterface || $throwable->getStatusCode() !== $config['status_code']) {
$headers = $throwable instanceof HttpExceptionInterface ? $throwable->getHeaders() : [];
$throwable = new HttpException($config['status_code'], $throwable->getMessage(), $throwable, $headers);
$event->setThrowable($throwable);
}
break;
}
$e = FlattenException::createFromThrowable($throwable);
$this->logException($throwable, sprintf('Uncaught PHP Exception %s: "%s" at %s line %s', $e->getClass(), $e->getMessage(), $e->getFile(), $e->getLine()), $logLevel);
}
public function onKernelException(ExceptionEvent $event)
{
if (null === $this->controller) {
return;
}
$throwable = $event->getThrowable();
$request = $this->duplicateRequest($throwable, $event->getRequest());
try {
$response = $event->getKernel()->handle($request, HttpKernelInterface::SUB_REQUEST, false);
} catch (\Exception $e) {
$f = FlattenException::createFromThrowable($e);
$this->logException($e, sprintf('Exception thrown when handling an exception (%s: %s at %s line %s)', $f->getClass(), $f->getMessage(), $e->getFile(), $e->getLine()));
$prev = $e;
do {
if ($throwable === $wrapper = $prev) {
throw $e;
}
} while ($prev = $wrapper->getPrevious());
$prev = new \ReflectionProperty($wrapper instanceof \Exception ? \Exception::class : \Error::class, 'previous');
$prev->setAccessible(true);
$prev->setValue($wrapper, $throwable);
throw $e;
}
$event->setResponse($response);
if ($this->debug) {
$event->getRequest()->attributes->set('_remove_csp_headers', true);
}
}
public function removeCspHeader(ResponseEvent $event): void
{
if ($this->debug && $event->getRequest()->attributes->get('_remove_csp_headers', false)) {
$event->getResponse()->headers->remove('Content-Security-Policy');
}
}
public function onControllerArguments(ControllerArgumentsEvent $event)
{
$e = $event->getRequest()->attributes->get('exception');
if (!$e instanceof \Throwable || false === $k = array_search($e, $event->getArguments(), true)) {
return;
}
$r = new \ReflectionFunction(\Closure::fromCallable($event->getController()));
$r = $r->getParameters()[$k] ?? null;
if ($r && (!($r = $r->getType()) instanceof \ReflectionNamedType || \in_array($r->getName(), [FlattenException::class, LegacyFlattenException::class], true))) {
$arguments = $event->getArguments();
$arguments[$k] = FlattenException::createFromThrowable($e);
$event->setArguments($arguments);
}
}
public static function getSubscribedEvents(): array
{
return [
KernelEvents::CONTROLLER_ARGUMENTS => 'onControllerArguments',
KernelEvents::EXCEPTION => [
['logKernelException', 0],
['onKernelException', -128],
],
KernelEvents::RESPONSE => ['removeCspHeader', -128],
];
}
/**
* Logs an exception.
*/
protected function logException(\Throwable $exception, string $message, ?string $logLevel = null): void
{
if (null !== $this->logger) {
if (null !== $logLevel) {
$this->logger->log($logLevel, $message, ['exception' => $exception]);
} elseif (!$exception instanceof HttpExceptionInterface || $exception->getStatusCode() >= 500) {
$this->logger->critical($message, ['exception' => $exception]);
} else {
$this->logger->error($message, ['exception' => $exception]);
}
}
}
/**
* Clones the request for the exception.
*/
protected function duplicateRequest(\Throwable $exception, Request $request): Request
{
$attributes = [
'_controller' => $this->controller,
'exception' => $exception,
'logger' => $this->logger instanceof DebugLoggerInterface ? $this->logger : null,
];
$request = $request->duplicate(null, null, $attributes);
$request->setMethod('GET');
return $request;
}
}

vendor/symfony/symfony/src/Symfony/Component/HttpKernel/EventListener/ErrorListener.php line 118