AccessArgumentsResolverFactory.php

<?php

namespace Drupal\Core\Access;

use Drupal\Component\Utility\ArgumentsResolver;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\HttpFoundation\Request;

/**
 * Resolves the arguments to pass to an access check callable.
 */
class AccessArgumentsResolverFactory implements AccessArgumentsResolverFactoryInterface {
    
    /**
     * {@inheritdoc}
     */
    public function getArgumentsResolver(RouteMatchInterface $route_match, AccountInterface $account, Request $request = NULL) {
        $route = $route_match->getRouteObject();
        // Defaults for the parameters defined on the route object need to be added
        // to the raw arguments.
        $raw_route_arguments = $route_match->getRawParameters()
            ->all() + $route->getDefaults();
        $upcasted_route_arguments = $route_match->getParameters()
            ->all();
        // Parameters which are not defined on the route object, but still are
        // essential for access checking are passed as wildcards to the argument
        // resolver. An access-check method with a parameter of type Route,
        // RouteMatchInterface, AccountInterface or Request will receive those
        // arguments regardless of the parameter name.
        $wildcard_arguments = [
            $route,
            $route_match,
            $account,
        ];
        if (isset($request)) {
            $wildcard_arguments[] = $request;
        }
        return new ArgumentsResolver($raw_route_arguments, $upcasted_route_arguments, $wildcard_arguments);
    }

}