gistfile1.php

<?php namespace App\Http\Middleware;

use App;
use Closure;
use Illuminate\Contracts\Routing\Middleware;

class MyMiddleware implements Middleware {

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next)
    {
        if ($request->get('xxxxxx') == 1) {
          App::abort();
        }

        return $next($request);
    }
}

// Bind middleware 
// App\Providers\AppServiceProvider
// ...

  protected $middleware = [
        'auth' = 'App\Http\Middleware\AuthMiddleware',
        'auth.basic' => 'App\Http\Middleware\BasicAuthMiddleware',
        'csrf' => 'App\Http\Middleware\CsrfMiddleware',
        'guest' => 'App\Http\Middleware\GuestMiddleware'
        'mymiddleware' => 'App\Http\Middleware\MyMiddleware',
    ];

// ...


// Controller:

class SomeController Extends Controller {
  /**
  * @Middleware("auth.basic")
  * @Middleware("auth")
  */
  public function index() {}  
}