Get request method in Silex middleware

$controllers = $app["controllers_factory"];
$controllers->before(function(Request $request){});

$app['callback'] = $app->protect(function(){});

$controllers->before($app["callback"]);

$app->get('/projet/{projetName}', 'App\Controller\Projet::single')
  ->bind('single.projet');

class Projet
{
  public function single(Application $app, $projetName)
  {
    // do anything with $projetName
  }
}

project/
  |
  |_app/
  |
  |_src/
  |
  |_vendor/
  |
  |_web/

// src/WL/App.php

namespace WL;

class App extends \Silex\Application
{
    use \Silex\Application\SwiftmailerTrait;

    // add some other trait
    // even custom methods or traits
}

// app/bootstrap.php

$app = new \WL\App();

// configure it, register controllers and services, ...

// or import them
foreach (glob(__DIR__ . "/../src/WL/Controller/*.php") as $controllers_provider) {
    include_once $controllers_provider;
}

return $app;

// src/Wl/Controller/blog.php

use Symfony\Component\HttpFoundation\Request;

/** @var \Silex\ControllerCollection $blog */
$blog = $app['controllers_factory'];

// define some routes

$blog->post('/send-mail', function (Request $request, \WL\App $app)
{
    // Now this application passed to your controller is an
    // instance of custom \App which has the trait you want
    // in contrary with the default \Silex\Application

    $app->mail(...

}

$app->mount('/blog', $blog);

// web/index.php

// define autoloading
// customize debug and server parameters

$app = require_once '../app/bootstrap.php';

$app->run();

use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\HttpKernelInterface;
use Symfony\Component\HttpKernel\Exception\UnauthorizedHttpException;
use Symfony\Component\HttpFoundation\Response;

$app->match('/', function () use ($app) {
    $app->before(function (Request $request) {
        $loggedIn= false;

        if (!$loggedIn) {
             throw new UnauthorizedHttpException(null,'unauthorized',null,Response::HTTP_UNAUTHORIZED);
        }
    });
});

$app->error(function (\Exception $e, Request $request, $code) {
    $message = strlen($e->getMessage()) > 0 ? $e->getMessage() : null;
    switch ($code) {
        case Response::HTTP_UNAUTHORIZED:
            $response = new Response($message, Response::HTTP_UNAUTHORIZED);
            break;
        default:
            $response = new Response($message, Response::HTTP_NOT_FOUND);
            break;
    }
    return $response;
});