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<?php
namespace Drupal\system\EventSubscriber;
use Drupal\Core\Routing\RouteSubscriberBase;
use Drupal\Core\Routing\RoutingEvents;
use Symfony\Component\Routing\Route;
use Symfony\Component\Routing\RouteCollection;
/**
* Adds the _admin_route option to each admin HTML route.
*/
class AdminRouteSubscriber extends RouteSubscriberBase {
/**
* {@inheritdoc}
*/
protected function alterRoutes(RouteCollection $collection) {
foreach ($collection->all() as $route) {
$path = $route->getPath();
if (($path == '/admin' || str_starts_with($path, '/admin/')) && !$route->hasOption('_admin_route') && static::isHtmlRoute($route)) {
$route->setOption('_admin_route', TRUE);
}
}
}
/**
* {@inheritdoc}
*/
public static function getSubscribedEvents(): array {
$events = parent::getSubscribedEvents();
// Use a lower priority than \Drupal\field_ui\Routing\RouteSubscriber or
// \Drupal\views\EventSubscriber\RouteSubscriber to ensure we add the option
// to their routes.
$events[RoutingEvents::ALTER] = ['onAlterRoutes', -200];
return $events;
}
/**
* Determines whether the given route is an HTML route.
*
* @param \Symfony\Component\Routing\Route $route
* The route to analyze.
*
* @return bool
* TRUE if HTML is a valid format for this route.
*/
protected static function isHtmlRoute(Route $route) {
// If a route has no explicit format, then HTML is valid.
$format = $route->hasRequirement('_format') ? explode('|', $route->getRequirement('_format')) : ['html'];
return in_array('html', $format, TRUE);
}
}
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