Ported changes from Adblock Plus integration back into URL Fixer

lib/typoNetError.js

Index: lib/typoNetError.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/lib/typoNetError.js
@@ -0,0 +1,138 @@
+/*
+ * This file is part of the URL Fixer,
+ * Copyright (C) 2006-2012 Eyeo GmbH
+ *
+ * URL Fixer 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.
+ *
+ * URL Fixer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with URL Fixer.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+let {Prefs} = require("prefs");
+let {WindowObserver} = require("windowObserver");
+let appIntegration = require("typoAppIntegration");
+let {onWhitelistEntryRemoved} = require("typoRules");
+let {processUserCorrection} = require("typoCollector");
+
+// Load HTML code to add to network error pages
+let netErrorOverlay = null;
+let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);
+request.open("GET", "chrome://" + require("info").addonName + "/content/netError.xhtml");
+request.addEventListener("load", function(event)
+{
+  netErrorOverlay = event.target.responseXML;
+  
+  new WindowObserver({
+    applyToWindow: function(window)
+    {
+      if (!appIntegration.isKnownWindow(window))
+        return;
+      
+      let browser = appIntegration.getBrowser(window);
+      if (browser)
+        browser.addEventListener("DOMContentLoaded", handlePageLoad, false);
+    },
+
+    removeFromWindow: function(window)
+    {
+      if (!appIntegration.isKnownWindow(window))
+        return;
+      
+      let browser = appIntegration.getBrowser(window);
+      if (browser)
+      {
+        browser.removeEventListener("DOMContentLoaded", handlePageLoad, false);
+        if (browser.browsers)
+        {
+          for (let i = 0; i < browser.browsers.length; i++)
+          {
+            let contentWnd = browser.browsers[i].contentWindow;
+            if (contentWnd.document.documentURI.indexOf("about:neterror?") == 0)
+              removeFromNetErrorPage(contentWnd);
+          }
+        }
+      }
+    }
+  });
+}, false);
+request.send(null);
+
+function handlePageLoad(event)
+{
+  let document = event.target;
+  if (document.documentURI.indexOf("about:neterror?") != 0 ||
+      document.documentURI.indexOf("e=netOffline") > 0 ||
+      document.documentURI.indexOf("e=notCached") > 0)
+  {
+    return;
+  }
+
+  if (!netErrorOverlay || document.getElementById("url-fixer-section"))
+    return;
+
+  let container = document.getElementById("errorPageContainer");
+  if (!container)
+    return;
+
+  container.appendChild(netErrorOverlay.documentElement.cloneNode(true));
+
+  let textField = document.getElementById("url-fixer-intention");
+  textField.value = document.defaultView.location.href;
+
+  let retryButton = document.getElementById("url-fixer-retry");
+  retryButton.addEventListener("click", function()
+  {
+    let newURL = textField.value.replace(/^\s+/, "").replace(/\s+$/, "");
+    if (!newURL.length)
+      return;
+
+    let [prefix, newHost, suffix] = parseURL(newURL);
+    let oldHost = document.defaultView.location.hostname.toLowerCase();
+
+    processUserCorrection(oldHost, newHost);
+
+    if (newHost.indexOf("www.") == 0 && oldHost.indexOf("www.") == 0)
+    {
+      // Ignore www. prefix if they both start with it
+      newHost = newHost.substr(4);
+      oldHost = oldHost.substr(4);
+    }
+    if (oldHost && newHost != oldHost)
+    {
+      Prefs.custom_replace[oldHost] = newHost;
+      Prefs.custom_replace = JSON.parse(JSON.stringify(Prefs.custom_replace));
+    }
+    
+    // Remove from whitelist
+    if (oldHost in Prefs.whitelist)
+    {
+      delete Prefs.whitelist[oldHost];
+      onWhitelistEntryRemoved(oldHost);
+      Prefs.whitelist = JSON.parse(JSON.stringify(Prefs.whitelist));
+    }
+    
+    document.defaultView.location.replace(newURL);
+  }, false);
+}
+
+function removeFromNetErrorPage(window)
+{
+  let overlay = window.document.getElementById("url-fixer-section");
+  if (overlay)
+    overlay.parentNode.removeChild(overlay);
+}
+
+function parseURL(url)
+{
+  if (/^\s*((?:\w+:)?\/*(?:[^\/#]*@)?)([^\/:#]*)/.test(url))
+    return [RegExp.$1, RegExp.$2.toLowerCase(), RegExp.rightContext];
+  else
+    return [url, null, null];
+}