UpdateRouteSubscriber.php

<?php

declare (strict_types=1);
namespace Drupal\update\Routing;

use Drupal\Core\Routing\RouteSubscriberBase;
use Drupal\Core\Site\Settings;
use Symfony\Component\Routing\RouteCollection;

/**
 * Route subscriber for Update module routes.
 */
class UpdateRouteSubscriber extends RouteSubscriberBase {
    
    /**
     * Constructs a new UpdateRouteSubscriber.
     */
    public function __construct(Settings $settings) {
    }
    
    /**
     * {@inheritdoc}
     */
    protected function alterRoutes(RouteCollection $collection) {
        if ($this->settings
            ->get('allow_authorize_operations', TRUE)) {
            return;
        }
        $routes = [
            'update.report_install',
            'update.report_update',
            'update.module_install',
            'update.module_update',
            'update.theme_install',
            'update.theme_update',
            'update.confirmation_page',
        ];
        foreach ($routes as $route) {
            $route = $collection->get($route);
            $route->setRequirement('_access', 'FALSE');
        }
    }

}