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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\Log\LoggerInterface;
use Psr\Log\LogLevel;
use Symfony\Component\ErrorHandler\ErrorHandler;
use Symfony\Component\ErrorHandler\Exception\FlattenException;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Attribute\WithHttpStatus;
use Symfony\Component\HttpKernel\Attribute\WithLogLevel;
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\DebugLoggerConfigurator;
/**
* @author Fabien Potencier <fabien@symfony.com>
*/
class ErrorListener implements EventSubscriberInterface
{
/**
* @param array<class-string, array{log_level: string|null, status_code: int<100,599>|null, log_channel: string|null}> $exceptionsMapping
*/
public function __construct(
protected string|object|array|null $controller,
protected ?LoggerInterface $logger = null,
protected bool $debug = false,
protected array $exceptionsMapping = [],
protected array $loggers = [],
) {
}
public function logKernelException(ExceptionEvent $event): void
{
$throwable = $event->getThrowable();
$logLevel = $this->resolveLogLevel($throwable);
$logChannel = $this->resolveLogChannel($throwable);
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() : [];
$throwable = HttpException::fromStatusCode($config['status_code'], $throwable->getMessage(), $throwable, $headers);
$event->setThrowable($throwable);
}
break;
}
// There's no specific status code defined in the configuration for this exception
if (!$throwable instanceof HttpExceptionInterface && $withHttpStatus = $this->getInheritedAttribute($throwable::class, WithHttpStatus::class)) {
$throwable = HttpException::fromStatusCode($withHttpStatus->statusCode, $throwable->getMessage(), $throwable, $withHttpStatus->headers);
$event->setThrowable($throwable);
}
$e = FlattenException::createFromThrowable($throwable);
$this->logException($throwable, \sprintf('Uncaught PHP Exception %s: "%s" at %s line %s', $e->getClass(), $e->getMessage(), basename($e->getFile()), $e->getLine()), $logLevel, $logChannel);
}
public function onKernelException(ExceptionEvent $event): void
{
if (null === $this->controller) {
return;
}
if (!$this->debug && $event->isKernelTerminating()) {
return;
}
$throwable = $event->getThrowable();
$exceptionHandler = set_exception_handler('var_dump');
restore_exception_handler();
if (\is_array($exceptionHandler) && $exceptionHandler[0] instanceof ErrorHandler) {
$throwable = $exceptionHandler[0]->enhanceError($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(), $f->getMessage(), basename($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');
$prev->setValue($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): void
{
$e = $event->getRequest()->attributes->get('exception');
if (!$e instanceof \Throwable || false === $k = array_search($e, $event->getArguments(), true)) {
return;
}
$r = new \ReflectionFunction($event->getController()(...));
$r = $r->getParameters()[$k] ?? null;
if ($r && (!($r = $r->getType()) instanceof \ReflectionNamedType || FlattenException::class === $r->getName())) {
$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.
*
* @param ?string $logChannel
*/
protected function logException(\Throwable $exception, string $message, ?string $logLevel = null/* , ?string $logChannel = null */): void
{
$logChannel = (3 < \func_num_args() ? func_get_arg(3) : null) ?? $this->resolveLogChannel($exception);
$logLevel ??= $this->resolveLogLevel($exception);
if (!$logger = $this->getLogger($logChannel)) {
return;
}
$logger->log($logLevel, $message, ['exception' => $exception]);
}
/**
* Resolves the level to be used when logging the exception.
*/
private function resolveLogLevel(\Throwable $throwable): string
{
foreach ($this->exceptionsMapping as $class => $config) {
if ($throwable instanceof $class && $config['log_level']) {
return $config['log_level'];
}
}
if ($withLogLevel = $this->getInheritedAttribute($throwable::class, WithLogLevel::class)) {
return $withLogLevel->level;
}
if (!$throwable instanceof HttpExceptionInterface || $throwable->getStatusCode() >= 500) {
return LogLevel::CRITICAL;
}
return LogLevel::ERROR;
}
private function resolveLogChannel(\Throwable $throwable): ?string
{
foreach ($this->exceptionsMapping as $class => $config) {
if ($throwable instanceof $class && isset($config['log_channel'])) {
return $config['log_channel'];
}
}
return null;
}
/**
* Clones the request for the exception.
*/
protected function duplicateRequest(\Throwable $exception, Request $request): Request
{
$attributes = [
'_controller' => $this->controller,
'exception' => $exception,
'logger' => DebugLoggerConfigurator::getDebugLogger($this->getLogger($this->resolveLogChannel($exception))),
];
$request = $request->duplicate(null, null, $attributes);
$request->setMethod('GET');
return $request;
}
/**
* @template T
*
* @param class-string<T> $attribute
*
* @return T|null
*/
private function getInheritedAttribute(string $class, string $attribute): ?object
{
$class = new \ReflectionClass($class);
$interfaces = [];
$attributeReflector = null;
$parentInterfaces = [];
$ownInterfaces = [];
do {
if ($attributes = $class->getAttributes($attribute, \ReflectionAttribute::IS_INSTANCEOF)) {
$attributeReflector = $attributes[0];
$parentInterfaces = class_implements($class->name);
break;
}
$interfaces[] = class_implements($class->name);
} while ($class = $class->getParentClass());
while ($interfaces) {
$ownInterfaces = array_diff_key(array_pop($interfaces), $parentInterfaces);
$parentInterfaces += $ownInterfaces;
foreach ($ownInterfaces as $interface) {
$class = new \ReflectionClass($interface);
if ($attributes = $class->getAttributes($attribute, \ReflectionAttribute::IS_INSTANCEOF)) {
$attributeReflector = $attributes[0];
}
}
}
return $attributeReflector?->newInstance();
}
private function getLogger(?string $logChannel): ?LoggerInterface
{
return $logChannel ? $this->loggers[$logChannel] ?? $this->logger : $this->logger;
}
}