clear get params in request

clearGetParams.php

<?php

class clearGetParams extends Middlewares\Middleware
{
    public $contexts = ['web'];
    public function onRequest()
    {
        if ($gets = request()->query()) {
            $white_list = array_fill_keys(explode(',', config('get_params')), null);
            if ($diff = array_diff_key($gets, $white_list)) {
                unset($gets['q']);
                foreach ($diff as $key => $value) {
                    unset($gets[$key]);
                }
                $newurl = request()->url() . '/?' . http_build_query($gets);
                redirect($newurl, array('responseCode' => 'HTTP/1.1 301 Moved Permanently'));
            }
        }
    }
}

return 'clearGetParams';