CSRF Protection Filter for Laravel 4 with AngularJS

gistfile1.php

<?php

Route::filter(
    'csrf',
    function () {
        $token = Request::header('X-XSRF-TOKEN');
        if (empty($token)) {
            $token = Input::get('_token');
        }

        if (Session::token() !== $token) {
            throw new Illuminate\Session\TokenMismatchException;
        }
    }
);