Fine Wines and Even Better Spirits

FineWines.user.js

// ==UserScript==
// @name     FineWines
// @version  1
// @match    https://www.finewineandgoodspirits.com/*
// @run-at   document-start

// finewinesandgoodspirits.com has a "throttling" mechanism on their page which aims to
// reduce the load on their server with the below script tacked to the body of each page:

/*
<script type="text/javascript">
var validate = "false";
var limitOrders = "true";
var userType = "G";
if(userType != 'A'){
	if(limitOrders == 'true'){
		if(validate == 'false'){
			var url = "http://";
			url +=  window.location.hostname;
			url +='/webapp/wcs/stores/servlet/SpecialAccessLandingPageView?langId=-1&storeId=10051&catalogId=10051';
			window.location.href= url;
		}
	}
}
</script>
*/

// In order to neutralize this client-only solution, we need to remove or alter the script
// after it loads in the DOM, but before it runs. This is challenging, because it means we
// need to watch DOM events to see when it gets parsed as text, then either remove it from
// the DOM or change the content to something relatively harmless.  The MutationObserver
// is perfect for this, as it'll notify us of new content as it's parsed into the DOM (but
// it means we need to be absolutely sure to run at document-start or the script will most
// likely fire and redirect us before we can patch it out).

// We need a MutationObserver in order to patch the inline scripts before they execute.
new MutationObserver((list, observer) => {
  // Each call has a list of MutationRecords.
  for(let x of list.values()) {
    // Each MutationRecord has a list of added nodes (and other things, but we're mostly
    // interested in those).
    for(let node of x.addedNodes) {
      // If the node is a script node and includes the special redirect page name, we can
      // reasonably assume that this is the one we want to zap.
      if(node.nodeName == "SCRIPT" && node.textContent.includes("SpecialAccessLandingPageView")) {
        // We could erase it entirely, but we should probably put in some of the variables
        // it creates just in case they're inspected elsewhere.
        node.textContent = "validate = false; userType = 'A';"
        
        // We're assuming we only need to zap one script, so stop listening so it doesn't
        // kill performance later.
        observer.disconnect()
        
        // And we're done, so GTFO.
        return;
      }
    }
  }
}).observe(document.documentElement, { childList: true, subtree: true });

// ==/UserScript==