<?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\Security\Http\EventListener;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\ExpressionLanguage\Expression;
use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
use Symfony\Component\HttpKernel\Event\ControllerArgumentsEvent;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Symfony\Component\HttpKernel\KernelEvents;
use Symfony\Component\Security\Core\Authorization\AuthorizationCheckerInterface;
use Symfony\Component\Security\Core\Exception\AccessDeniedException;
use Symfony\Component\Security\Core\Exception\RuntimeException;
use Symfony\Component\Security\Http\Attribute\IsGranted;
/**
* Handles the IsGranted attribute on controllers.
*
* @author Ryan Weaver <ryan@knpuniversity.com>
*/
class IsGrantedAttributeListener implements EventSubscriberInterface
{
public function __construct(
private readonly AuthorizationCheckerInterface $authChecker,
private ?ExpressionLanguage $expressionLanguage = null,
) {
}
public function onKernelControllerArguments(ControllerArgumentsEvent $event)
{
/** @var IsGranted[] $attributes */
if (!\is_array($attributes = $event->getAttributes()[IsGranted::class] ?? null)) {
return;
}
$arguments = $event->getNamedArguments();
foreach ($attributes as $attribute) {
$subject = null;
if ($subjectRef = $attribute->subject) {
if (\is_array($subjectRef)) {
foreach ($subjectRef as $refKey => $ref) {
$subject[\is_string($refKey) ? $refKey : (string) $ref] = $this->getIsGrantedSubject($ref, $arguments);
}
} else {
$subject = $this->getIsGrantedSubject($subjectRef, $arguments);
}
}
if (!$this->authChecker->isGranted($attribute->attribute, $subject)) {
$message = $attribute->message ?: sprintf('Access Denied by #[IsGranted(%s)] on controller', $this->getIsGrantedString($attribute));
if ($statusCode = $attribute->statusCode) {
throw new HttpException($statusCode, $message);
}
$accessDeniedException = new AccessDeniedException($message);
$accessDeniedException->setAttributes($attribute->attribute);
$accessDeniedException->setSubject($subject);
throw $accessDeniedException;
}
}
}
public static function getSubscribedEvents(): array
{
return [KernelEvents::CONTROLLER_ARGUMENTS => ['onKernelControllerArguments', 10]];
}
private function getIsGrantedSubject(string|Expression $subjectRef, array $arguments): mixed
{
if ($subjectRef instanceof Expression) {
$this->expressionLanguage ??= new ExpressionLanguage();
return $this->expressionLanguage->evaluate($subjectRef, [
'args' => $arguments,
]);
}
if (!\array_key_exists($subjectRef, $arguments)) {
throw new RuntimeException(sprintf('Could not find the subject "%s" for the #[IsGranted] attribute. Try adding a "$%s" argument to your controller method.', $subjectRef, $subjectRef));
}
return $arguments[$subjectRef];
}
private function getIsGrantedString(IsGranted $isGranted): string
{
$processValue = fn ($value) => sprintf($value instanceof Expression ? 'new Expression("%s")' : '"%s"', $value);
$argsString = $processValue($isGranted->attribute);
if (null !== $subject = $isGranted->subject) {
$subject = !\is_array($subject) ? $processValue($subject) : array_map(function ($key, $value) use ($processValue) {
$value = $processValue($value);
return \is_string($key) ? sprintf('"%s" => %s', $key, $value) : $value;
}, array_keys($subject), $subject);
$argsString .= ', '.(!\is_array($subject) ? $subject : '['.implode(', ', $subject).']');
}
return $argsString;
}
}