Laravel Filter Route based on Role

gistfile1.php

<?php

Route::get('protected', array('before' => 'auth|role:admin', function() {
    return "Only admins can see this";
}));

Route::filter('role', function ($role) {
    if ( ! Auth::user()->has_role( $role ) )
    {
        return Response::error("401"); // not authorized
    }
});