Amazon_S3_And_CloudFront::get_attached_file PHP Method

    function get_attached_file($file, $attachment_id)
    {
        if (file_exists($file) || !($s3object = $this->is_attachment_served_by_s3($attachment_id))) {
            return $file;
        }
        $url = $this->get_attachment_url($attachment_id);
        // return the URL by default
        $file = apply_filters('as3cf_get_attached_file', $url, $file, $attachment_id, $s3object);
        return $file;
    }