Amazon_S3_And_CloudFront::get_default_object_prefix PHP Method

    function get_default_object_prefix()
    {
        if (is_multisite()) {
            return 'wp-content/uploads/';
        }
        $uploads = wp_upload_dir();
        $parts = parse_url($uploads['baseurl']);
        $path = ltrim($parts['path'], '/');
        return trailingslashit($path);
    }