sheriff.php

<?php

require 'authenticated_controller.php';

class SheriffController extends AuthenticatedController
{

    function index_action()
    {
        $args = func_get_args();
        var_dump(__METHOD__, $args);
        $this->render_nothing();
    }

    function before_filter(&$action, &$args)
    {
        parent::before_filter($action, $args);
        $args = $this->filterArgs($args);
    }

    // override this to implement your own filtering
    function filterArgs($args)
    {
        foreach ($args as $arg) {
            if (preg_match('/[^a-zA-Z0-9]/', $arg)) {
                throw new Trails_Exception(400);
            }
        }
        return $args;
    }
}