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<?php
namespace Drupal\Core\EventSubscriber;
use Drupal\Core\Database\Connection;
use Drupal\Core\Installer\InstallerRedirectTrait;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\Event\ExceptionEvent;
use Symfony\Component\HttpKernel\KernelEvents;
/**
* Exception handler to determine if an exception indicates an uninstalled site.
*/
class ExceptionDetectNeedsInstallSubscriber implements EventSubscriberInterface {
use InstallerRedirectTrait;
/**
* The default database connection.
*
* @var \Drupal\Core\Database\Connection
*/
protected $connection;
/**
* Constructs a new ExceptionDetectNeedsInstallSubscriber.
*
* @param \Drupal\Core\Database\Connection $connection
* The default database connection.
*/
public function __construct(Connection $connection) {
$this->connection = $connection;
}
/**
* Handles errors for this subscriber.
*
* @param \Symfony\Component\HttpKernel\Event\ExceptionEvent $event
* The event to process.
*/
public function onException(ExceptionEvent $event) {
$exception = $event->getThrowable();
if ($this->shouldRedirectToInstaller($exception, $this->connection)) {
// Only redirect if this is an HTML response (i.e., a user trying to view
// the site in a web browser before installing it).
$request = $event->getRequest();
$format = $request->query->get(MainContentViewSubscriber::WRAPPER_FORMAT, $request->getRequestFormat());
if ($format == 'html') {
$event->setResponse(new RedirectResponse($request->getBasePath() . '/core/install.php', 302, ['Cache-Control' => 'no-cache']));
}
}
}
/**
* Registers the methods in this class that should be listeners.
*
* @return array
* An array of event listener definitions.
*/
public static function getSubscribedEvents(): array {
$events[KernelEvents::EXCEPTION][] = ['onException', 100];
return $events;
}
}
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