Custom token based filtering in Laravel

laravel.php

<?php

# app/models/TokenFilter.php

class TokenFilter {

    public function filter()
    {
        if(!Token::valid(Input::get('token')))
        {
            return Response::json(array(
                'error' => 'Your access token is not valid'
            ), 403);
        }
    }

} 

# app/filter.php

Route::filter('auth.token', 'TokenFilter');

# app/routes.php

Route::get('/api/test',  array('before' => 'auth.token', function()
{
    return View::make('hello');
}));

?>