public function format_message_text($cm, $post) {
        $context = \context_module::instance($cm->id);
        $message = file_rewrite_pluginfile_urls(
            $post->message,
            'pluginfile.php',
            $context->id,
            'mod_forum',
            'post',
            $post->id,
            [
                'includetoken' => true,
            ]);
        $options = new \stdClass();
        $options->para = true;
        $options->context = $context;
        return format_text($message, $post->messageformat, $options);
    }