Further debloating and commenting for the ghetto blacklist.

views/uv/sw.js

@@ -32,30 +32,50 @@ ww.use({
 const uv = new UVServiceWorker();
 
 //  Get list of blacklisted domains.
-let blacklist;
+const blacklist = {};
 fetch("/assets/json/blacklist.json").then(request => {
   request.json().then(jsonData => {
-    blacklist = new RegExp(jsonData.map(
-      domain =>
-        encodeURIComponent(domain)
+
+//  Organize each domain by their tld (top level domain) ending.
+    jsonData.forEach(domain => {
+      const domainTld = domain.replace(/.+(?=\.\w)/, "");
+      if (!blacklist.hasOwnProperty(domainTld))
+        blacklist[domainTld] = [];
+
+//    Store each entry in an array. Each tld has its own array, which will
+//    later be concatenated into a regular expression.
+      blacklist[domainTld].push(
+        encodeURIComponent(domain.slice(0, -domainTld.length))
         .replace(/([()])/g, "\\$1")
-        .replaceAll("*.", "(?:.+\\.)?")
-        .replaceAll(".", "\\.")
-    ).join("|"));
+        .replace(/(\*\.)|\./g, (match, firstExpression) =>
+          firstExpression ? "(?:.+\\.)?" : "\\" + match)
+      );
+    });
+
+//  Turn each domain list into a regular expression and prevent this
+//  from being accidentally modified afterward.
+    for (let [domainTld, domainList] of Object.entries(blacklist))
+      blacklist[domainTld] = new RegExp(`^(?:${domainList.join("|")})$`);
+    Object.freeze(blacklist);
   });
 });
 
 self.addEventListener("fetch", (event) => {
   event.respondWith(
     (async () => {
+      if (uv.route(event)) {
 //    The one and only ghetto domain blacklist.
-      if (!new URL(event.request.url).pathname.indexOf("/uv/service/")) {
-        const url = new URL(uv.config.decodeUrl(new URL(event.request.url).pathname.replace(/^\/uv\/service\//, "")));
-        if (blacklist.test(url.hostname))
-          return new Response(new Blob(), {status: 406});
-      }
+        const domain = new URL(uv.config.decodeUrl(
+            new URL(event.request.url).pathname
+            .replace(uv.config.prefix, "")
+          )).hostname,
+          domainTld = domain.replace(/.+(?=\.\w)/, "");
+
+//      If the domain is in the blacklist, return a 406 response code.
+        if (blacklist.hasOwnProperty(domainTld) &&
+          blacklist[domainTld].test(domain.slice(0, -domainTld.length))
+        ) return new Response(new Blob(), {status: 406});
 
-      if (uv.route(event)) {
         return await uv.fetch(event);
       }
       return await fetch(event.request);