RouterTestEarlyExceptionSubscriber.php

<?php

declare (strict_types=1);
namespace Drupal\router_test;

use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\Exception\HttpException;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * Event subscribers for exceptions thrown in early kernel middleware.
 */
class RouterTestEarlyExceptionSubscriber implements EventSubscriberInterface {
    
    /**
     * Throw an exception, which will trigger exception-handling subscribers.
     *
     * See DefaultExceptionHtmlSubscriber.
     */
    public function onKernelRequest(RequestEvent $event) : void {
        if ($event->isMainRequest() && $event->getRequest()->headers
            ->get('Authorization') === 'Bearer invalid') {
            throw new HttpException(Response::HTTP_UNAUTHORIZED, 'This is a common exception during authentication.');
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public static function getSubscribedEvents() : array {
        // This is the same priority as AuthenticationSubscriber, however
        // exceptions are not restricted to authentication; this is a common,
        // early point to emulate an exception, e.g. when an OAuth token is
        // rejected.
        $events[KernelEvents::REQUEST][] = [
            'onKernelRequest',
            300,
        ];
        return $events;
    }

}