Noissue - Abstract hostname normalization

lib/domain.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 22 matching lines @@
 {
   let map = new Map();
 
   for (let key in publicSuffixes)
     map.set(key, publicSuffixes[key]);
 
   return map;
 }
 
 /**
+ * Normalizes a hostname.
+ * @param {string} hostname
+ * @returns {string}
+ */
+function normalizeHostname(hostname)
+{
+  return (hostname[hostname.length - 1] == "." ?
+            hostname.replace(/\.+$/, "") : hostname).toLowerCase();
+}
+
+exports.normalizeHostname = normalizeHostname;
+
+/**
  * Yields all suffixes for a domain. For example, given the domain
  * <code>www.example.com</code>, this function yields
  * <code>www.example.com</code>, <code>example.com</code>, and
  * <code>com</code>, in that order.
  *
  * @param {string} domain The domain.
  * @param {boolean} [includeBlank] Whether to include the blank suffix at the
  *   end.
  *
  * @yields {string} The next suffix for the domain.
@@ skipping 87 matching lines @@
   if (requestHostname == documentHostname)
     return false;
 
   if (!isDomain(requestHostname) || !isDomain(documentHostname))
     return true;
 
   return getDomain(requestHostname) != getDomain(documentHostname);
 }
 
 exports.isThirdParty = isThirdParty;