laravel 5でXSS防御用のミドルウェアを作成するにはどうすればよいですか?

php artisan make:middleware XSS

namespace App\Http\Middleware;
use Closure;
use Illuminate\Http\Request;
class XSS
{
    public function handle(Request $request, Closure $next)
    {
        $input = $request->all();
        array_walk_recursive($input, function(&$input) {
            $input = strip_tags($input);
        });
        $request->merge($input);
        return $next($request);
    }
}

class Kernel extends HttpKernel
{
	....
    protected $routeMiddleware = [
        'auth' => \App\Http\Middleware\Authenticate::class,
        ....
        'XSS' => \App\Http\Middleware\XSS::class,
    ];
}

Route::group(['middleware' => ['XSS']], function () {
  Route::get('customVali', 'CustomValDemoController@customVali');
  Route::post('customValiPost', 'CustomValDemoController@customValiPost');
});