如何解码CloudFront签名的URL

Question

我想解码这个原始链接：

<script type="text/javascript">
_atrk_opts = { atrk_acct:"Q0s3k1a0CM00EJ", domain:"rtopi.com",dynamic: true};
(function() { 
    var as = document.createElement("script"); 
    as.type = "text/javascript"; as.async = true; as.src = "https://d31qbv1cthcecs.cloudfront.net/atrk.js"; 
    var s = document.getElementsByTagName("script")[0];
    s.parentNode.insertBefore(as, s); 
})();
</script>
<noscript><img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=Q0s3k1a0CM00EJ" style="display:none" height="1" width="1" alt="rtopi.com" /></noscript>