set guard paramter on route without auth

RouteServiceProvider.php

<?php

namespace App\Providers;

use App\Modules\Payment\Entities\PaymentMethod;
use App\Modules\Shipping\Entities\ShippingOption;
use App\Modules\Variant\Entities\VariantOption;
use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;
use Illuminate\Routing\Router;

class RouteServiceProvider extends ServiceProvider
{
    /**
     * This namespace is applied to your controller routes.
     *
     * In addition, it is set as the URL generator's root namespace.
     *
     * @var string
     */
    protected $namespace = 'App\Http\Controllers';

    /**
     * Define your route model bindings, pattern filters, etc.
     *
     * @internal param Router $router
     */
    public function boot()
    {
        parent::boot();

        $this->registerRouteGuardParameter();
    }

    /**
     * Define the routes for the application.
     *
     * @param  \Illuminate\Routing\Router  $router
     * @return void
     */
    public function map(Router $router)
    {
        $this->mapWebRoutes($router);

        //
    }

    /**
     * Define the "web" routes for the application.
     *
     * These routes all receive session state, CSRF protection, etc.
     *
     * @param  \Illuminate\Routing\Router  $router
     * @return void
     */
    protected function mapWebRoutes(Router $router)
    {
        $router->group([
            'namespace' => $this->namespace, 'middleware' => 'web',
        ], function () {
            require app_path('Http/routes.php');
        });
    }

    private function registerRouteGuardParameter()
    {
        $this->app['router']->matched(function (\Illuminate\Routing\Events\RouteMatched $e) {
            $route = $e->route;
            if (!array_has($route->getAction(), 'guard')) {
                return;
            }
            $routeGuard = array_get($route->getAction(), 'guard');
            $this->app['auth']->resolveUsersUsing(function ($guard = null) use ($routeGuard) {
                return $this->app['auth']->guard($routeGuard)->user();
            });
            $this->app['auth']->setDefaultDriver($routeGuard);
        });
    }
}