Jetpack::remote_request_handlers PHP Method

    function remote_request_handlers()
    {
        switch (current_filter()) {
            case 'wp_ajax_nopriv_jetpack_upload_file':
                $response = $this->upload_handler();
                break;
            default:
                $response = new Jetpack_Error('unknown_handler', 'Unknown Handler', 400);
                break;
        }
        if (!$response) {
            $response = new Jetpack_Error('unknown_error', 'Unknown Error', 400);
        }
        if (is_wp_error($response)) {
            $status_code = $response->get_error_data();
            $error = $response->get_error_code();
            $error_description = $response->get_error_message();
            if (!is_int($status_code)) {
                $status_code = 400;
            }
            status_header($status_code);
            die(json_encode((object) compact('error', 'error_description')));
        }
        status_header(200);
        if (true === $response) {
            exit;
        }
        die(json_encode((object) $response));
    }