Routes by domain

One of the drawbacks of lumen’s and maravel's router (nikic/fast-route) is the lack of domain handling.

Lumen mentions domain key only in one place but it is never used:

// \Laravel\Lumen\Routing\Router::mergeGroup

    /**
     * Merge the given group attributes.
     *
     * @param  array  $new
     * @param  array  $old
     * @return array
     */
    public function mergeGroup($new, $old)
    {
        $new['namespace'] = static::formatUsesPrefix($new, $old);

        $new['prefix'] = static::formatGroupPrefix($new, $old);

        if (isset($new['domain'])) {
            unset($old['domain']);
        }

        if (isset($old['as'])) {
            $new['as'] = $old['as'].(isset($new['as']) ? '.'.$new['as'] : '');
        }

        if (isset($old['suffix']) && ! isset($new['suffix'])) {
            $new['suffix'] = $old['suffix'];
        }

        return array_merge_recursive(Arr::except($old, ['namespace', 'prefix', 'as', 'suffix']), $new);
    }

So, using it like this makes no difference:

$router->group(
    [
        'domain' => \env('APP_URL')
    ],
    function (Router $router): void {
        $router->post('/login', 'Auth\AuthController@login');
    }
);

Some might say Symfony 4.1 from Laravel is faster and handles also domains but, for those who still use lumen/maravel this is a way of restricting or registering the routes by domains:

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;

class DomainMiddleware
{
    public function handle(Request $request, Closure $next, string $urlEncodedCsvUrls): mixed
    {
        if (\str_contains(\urldecode($urlEncodedCsvUrls), $request->getHost())) {
            return $next($request);
        }

        return \response(status: 404);
    }
}

// bootstrap/app.php

$app->routeMiddleware([
     'url.encoded.domains' => \App\Http\Middleware\DomainMiddleware::class,
]);

// routes/web.php

$router->group(
    [
        'middleware' => [
            'url.encoded.domains:' . \urlencode(\rtrim(\env('APP_URL2'), ',') . ',' . \env('APP_URL'))
    ],
    function (Router $router): void {
        $router->post('/login', 'Auth\AuthController@login');
    }
);