Issue 4878 - Start using ESLint for adblockpluscore

lib/notification.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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
  * 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 Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+"use strict";
+
 /**
  * @fileOverview Handles notifications.
  */
 
-Cu.import("resource://gre/modules/Services.jsm");
+const {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
 
-var {Prefs} = require("prefs");
-var {Downloader, Downloadable, MILLIS_IN_MINUTE, MILLIS_IN_HOUR, MILLIS_IN_DAY} = require("downloader");
-var {Utils} = require("utils");
-var {Matcher, defaultMatcher} = require("matcher");
-var {Filter, RegExpFilter, WhitelistFilter} = require("filterClasses");
+const {Prefs} = require("prefs");
+const {Downloader, Downloadable,
+       MILLIS_IN_MINUTE, MILLIS_IN_HOUR, MILLIS_IN_DAY} = require("downloader");
+const {Utils} = require("utils");
+const {Matcher, defaultMatcher} = require("matcher");
+const {Filter, RegExpFilter, WhitelistFilter} = require("filterClasses");
 
-var INITIAL_DELAY = 1 * MILLIS_IN_MINUTE;
-var CHECK_INTERVAL = 1 * MILLIS_IN_HOUR;
-var EXPIRATION_INTERVAL = 1 * MILLIS_IN_DAY;
-var TYPE = {
+const INITIAL_DELAY = 1 * MILLIS_IN_MINUTE;
+const CHECK_INTERVAL = 1 * MILLIS_IN_HOUR;
+const EXPIRATION_INTERVAL = 1 * MILLIS_IN_DAY;
+const TYPE = {
   information: 0,
   question: 1,
   relentless: 2,
   critical: 3
 };
 
-var showListeners = [];
-var questionListeners = {};
+let showListeners = [];
+let questionListeners = {};
 
 function getNumericalSeverity(notification)
 {
-  return (notification.type in TYPE ? TYPE[notification.type] : TYPE.information);
+  if (notification.type in TYPE)
+    return TYPE[notification.type];
+  return TYPE.information;
 }
 
 function saveNotificationData()
 {
   // HACK: JSON values aren't saved unless they are assigned a different object.
   Prefs.notificationdata = JSON.parse(JSON.stringify(Prefs.notificationdata));
 }
 
 function localize(translations, locale)
 {
   if (locale in translations)
     return translations[locale];
 
   let languagePart = locale.substring(0, locale.indexOf("-"));
   if (languagePart && languagePart in translations)
     return translations[languagePart];
 
   let defaultLocale = "en-US";
   return translations[defaultLocale];
 }
 
 /**
  * The object providing actual downloading functionality.
- * @type Downloader
+ * @type {Downloader}
  */
-var downloader = null;
-var localData = [];
+let downloader = null;
+let localData = [];
 
 /**
  * Regularly fetches notifications and decides which to show.
  * @class
  */
-var Notification = exports.Notification =
+let Notification = exports.Notification =
 {
   /**
    * Called on module startup.
    */
-  init: function()
+  init()
   {
-    downloader = new Downloader(this._getDownloadables.bind(this), INITIAL_DELAY, CHECK_INTERVAL);
+    downloader = new Downloader(this._getDownloadables.bind(this),
+                                INITIAL_DELAY, CHECK_INTERVAL);
     downloader.onExpirationChange = this._onExpirationChange.bind(this);
     downloader.onDownloadSuccess = this._onDownloadSuccess.bind(this);
     downloader.onDownloadError = this._onDownloadError.bind(this);
     onShutdown.add(() => downloader.cancel());
   },
 
   /**
    * Yields a Downloadable instances for the notifications download.
    */
-  _getDownloadables: function*()
+  *_getDownloadables()
   {
     let downloadable = new Downloadable(Prefs.notificationurl);
     if (typeof Prefs.notificationdata.lastError === "number")
       downloadable.lastError = Prefs.notificationdata.lastError;
     if (typeof Prefs.notificationdata.lastCheck === "number")
       downloadable.lastCheck = Prefs.notificationdata.lastCheck;
-    if (typeof Prefs.notificationdata.data === "object" && "version" in Prefs.notificationdata.data)
+    if (typeof Prefs.notificationdata.data === "object" &&
+        "version" in Prefs.notificationdata.data)
+    {
       downloadable.lastVersion = Prefs.notificationdata.data.version;
+    }
     if (typeof Prefs.notificationdata.softExpiration === "number")
       downloadable.softExpiration = Prefs.notificationdata.softExpiration;
     if (typeof Prefs.notificationdata.hardExpiration === "number")
       downloadable.hardExpiration = Prefs.notificationdata.hardExpiration;
     if (typeof Prefs.notificationdata.downloadCount === "number")
       downloadable.downloadCount = Prefs.notificationdata.downloadCount;
     yield downloadable;
   },
 
-  _onExpirationChange: function(downloadable)
+  _onExpirationChange(downloadable)
   {
     Prefs.notificationdata.lastCheck = downloadable.lastCheck;
     Prefs.notificationdata.softExpiration = downloadable.softExpiration;
     Prefs.notificationdata.hardExpiration = downloadable.hardExpiration;
     saveNotificationData();
   },
 
-  _onDownloadSuccess: function(downloadable, responseText, errorCallback, redirectCallback)
+  _onDownloadSuccess(downloadable, responseText, errorCallback,
+                     redirectCallback)
   {
     try
     {
       let data = JSON.parse(responseText);
       for (let notification of data.notifications)
       {
         if ("severity" in notification)
         {
           if (!("type" in notification))
             notification.type = notification.severity;
           delete notification.severity;
         }
       }
       Prefs.notificationdata.data = data;
     }
     catch (e)
     {
       Cu.reportError(e);
       errorCallback("synchronize_invalid_data");
       return;
     }
 
     Prefs.notificationdata.lastError = 0;
     Prefs.notificationdata.downloadStatus = "synchronize_ok";
-    [Prefs.notificationdata.softExpiration, Prefs.notificationdata.hardExpiration] = downloader.processExpirationInterval(EXPIRATION_INTERVAL);
+    [
+      Prefs.notificationdata.softExpiration,
+      Prefs.notificationdata.hardExpiration
+    ] = downloader.processExpirationInterval(EXPIRATION_INTERVAL);
     Prefs.notificationdata.downloadCount = downloadable.downloadCount;
     saveNotificationData();
 
     Notification.showNext();
   },
 
-  _onDownloadError: function(downloadable, downloadURL, error, channelStatus, responseStatus, redirectCallback)
+  _onDownloadError(downloadable, downloadURL, error, channelStatus,
+                   responseStatus, redirectCallback)
   {
     Prefs.notificationdata.lastError = Date.now();
     Prefs.notificationdata.downloadStatus = error;
     saveNotificationData();
   },
 
   /**
    * Adds a listener for notifications to be shown.
    * @param {Function} listener Listener to be invoked when a notification is
    *                   to be shown
    */
-  addShowListener: function(listener)
+  addShowListener(listener)
   {
     if (showListeners.indexOf(listener) == -1)
       showListeners.push(listener);
   },
 
   /**
    * Removes the supplied listener.
    * @param {Function} listener Listener that was added via addShowListener()
    */
-  removeShowListener: function(listener)
+  removeShowListener(listener)
   {
     let index = showListeners.indexOf(listener);
     if (index != -1)
       showListeners.splice(index, 1);
   },
 
   /**
    * Determines which notification is to be shown next.
-   * @param {String} url URL to match notifications to (optional)
+   * @param {string} url URL to match notifications to (optional)
    * @return {Object} notification to be shown, or null if there is none
    */
-  _getNextToShow: function(url)
+  _getNextToShow(url)
   {
     function checkTarget(target, parameter, name, version)
     {
       let minVersionKey = parameter + "MinVersion";
       let maxVersionKey = parameter + "MaxVersion";
       return !((parameter in target && target[parameter] != name) ||
-               (minVersionKey in target && Services.vc.compare(version, target[minVersionKey]) < 0) ||
-               (maxVersionKey in target && Services.vc.compare(version, target[maxVersionKey]) > 0));
+               (minVersionKey in target &&
+                Services.vc.compare(version, target[minVersionKey]) < 0) ||
+               (maxVersionKey in target &&
+                Services.vc.compare(version, target[maxVersionKey]) > 0));
     }
 
     let remoteData = [];
-    if (typeof Prefs.notificationdata.data == "object" && Prefs.notificationdata.data.notifications instanceof Array)
+    if (typeof Prefs.notificationdata.data == "object" &&
+        Prefs.notificationdata.data.notifications instanceof Array)
+    {
       remoteData = Prefs.notificationdata.data.notifications;
+    }
 
     let notifications = localData.concat(remoteData);
     if (notifications.length === 0)
       return null;
 
-    let {addonName, addonVersion, application, applicationVersion, platform, platformVersion} = require("info");
+    const {addonName, addonVersion, application,
+           applicationVersion, platform, platformVersion} = require("info");
     let notificationToShow = null;
     for (let notification of notifications)
     {
-      if (typeof notification.type === "undefined" || notification.type !== "critical")
+      if (typeof notification.type === "undefined" ||
+          notification.type !== "critical")
       {
         let shown;
         if (typeof Prefs.notificationdata.shown == "object")
           shown = Prefs.notificationdata.shown[notification.id];
 
         if (typeof shown != "undefined")
         {
           if (typeof notification.interval == "number")
           {
             if (shown + notification.interval > Date.now())
               continue;
           }
           else if (shown)
             continue;
         }
 
-        if (notification.type !== "relentless" && Prefs.notifications_ignoredcategories.indexOf("*") != -1)
+        if (notification.type !== "relentless" &&
+            Prefs.notifications_ignoredcategories.indexOf("*") != -1)
+        {
           continue;
+        }
       }
 
       if (typeof url === "string" || notification.urlFilters instanceof Array)
       {
-        if (Prefs.enabled && typeof url === "string" && notification.urlFilters instanceof Array)
+        if (Prefs.enabled && typeof url === "string" &&
+            notification.urlFilters instanceof Array)
         {
           let host;
           try
           {
             host = new URL(url).hostname;
           }
           catch (e)
           {
             host = "";
           }
 
-          let exception = defaultMatcher.matchesAny(url, RegExpFilter.typeMap.DOCUMENT, host, false, null);
+          let exception = defaultMatcher.matchesAny(
+            url, RegExpFilter.typeMap.DOCUMENT, host, false, null
+          );
           if (exception instanceof WhitelistFilter)
             continue;
 
           let matcher = new Matcher();
           for (let urlFilter of notification.urlFilters)
             matcher.add(Filter.fromText(urlFilter));
-          if (!matcher.matchesAny(url, RegExpFilter.typeMap.DOCUMENT, host, false, null))
+          if (!matcher.matchesAny(url, RegExpFilter.typeMap.DOCUMENT, host,
+              false, null))
+          {
             continue;
+          }
         }
         else
           continue;
       }
 
       if (notification.targets instanceof Array)
       {
         let match = false;
         for (let target of notification.targets)
         {
           if (checkTarget(target, "extension", addonName, addonVersion) &&
-              checkTarget(target, "application", application, applicationVersion) &&
+              checkTarget(target, "application", application,
+                          applicationVersion) &&
               checkTarget(target, "platform", platform, platformVersion))
           {
             match = true;
             break;
           }
         }
         if (!match)
           continue;
       }
 
-      if (!notificationToShow
-          || getNumericalSeverity(notification) > getNumericalSeverity(notificationToShow))
+      if (!notificationToShow ||
+          getNumericalSeverity(notification) >
+            getNumericalSeverity(notificationToShow))
         notificationToShow = notification;
     }
 
     return notificationToShow;
   },
 
   /**
    * Invokes the listeners added via addShowListener() with the next
    * notification to be shown.
-   * @param {String} url URL to match notifications to (optional)
+   * @param {string} url URL to match notifications to (optional)
    */
-  showNext: function(url)
+  showNext(url)
   {
     let notification = Notification._getNextToShow(url);
     if (notification)
+    {
       for (let showListener of showListeners)
         showListener(notification);
+    }
   },
 
   /**
    * Marks a notification as shown.
-   * @param {String} id ID of the notification to be marked as shown
+   * @param {string} id ID of the notification to be marked as shown
    */
-  markAsShown: function(id)
+  markAsShown(id)
   {
     let now = Date.now();
     let data = Prefs.notificationdata;
 
     if (data.shown instanceof Array)
     {
       let newShown = {};
       for (let oldId of data.shown)
         newShown[oldId] = now;
       data.shown = newShown;
     }
 
     if (typeof data.shown != "object")
       data.shown = {};
 
     data.shown[id] = now;
 
     saveNotificationData();
   },
 
   /**
    * Localizes the texts of the supplied notification.
    * @param {Object} notification notification to translate
-   * @param {String} locale the target locale (optional, defaults to the
+   * @param {string} locale the target locale (optional, defaults to the
    *                        application locale)
    * @return {Object} the translated texts
    */
-  getLocalizedTexts: function(notification, locale)
+  getLocalizedTexts(notification, locale)
   {
     locale = locale || Utils.appLocale;
     let textKeys = ["title", "message"];
     let localizedTexts = [];
     for (let key of textKeys)
     {
       if (key in notification)
       {
         if (typeof notification[key] == "string")
           localizedTexts[key] = notification[key];
         else
           localizedTexts[key] = localize(notification[key], locale);
       }
     }
     return localizedTexts;
   },
 
   /**
    * Adds a local notification.
    * @param {Object} notification notification to add
    */
-  addNotification: function(notification)
+  addNotification(notification)
   {
     if (localData.indexOf(notification) == -1)
       localData.push(notification);
   },
 
   /**
    * Removes an existing local notification.
    * @param {Object} notification notification to remove
    */
-  removeNotification: function(notification)
+  removeNotification(notification)
   {
     let index = localData.indexOf(notification);
     if (index > -1)
       localData.splice(index, 1);
   },
 
   /**
+   * A callback function which listens to see if notifications were approved.
+   *
+   * @callback QuestionListener
+   * @param {boolean} approved
+   */
+
+  /**
    * Adds a listener for question-type notifications
+   * @param {string} id
+   * @param {QuestionListener} listener
    */
-  addQuestionListener: function(/**string*/ id, /**function(approved)*/ listener)
+  addQuestionListener(id, listener)
   {
     if (!(id in questionListeners))
       questionListeners[id] = [];
     if (questionListeners[id].indexOf(listener) === -1)
       questionListeners[id].push(listener);
   },
 
   /**
    * Removes a listener that was previously added via addQuestionListener
+   * @param {string} id
+   * @param {QuestionListener} listener
    */
-  removeQuestionListener: function(/**string*/ id, /**function(approved)*/ listener)
+  removeQuestionListener(id, listener)
   {
     if (!(id in questionListeners))
       return;
     let index = questionListeners[id].indexOf(listener);
     if (index > -1)
       questionListeners[id].splice(index, 1);
     if (questionListeners[id].length === 0)
       delete questionListeners[id];
   },
 
   /**
    * Notifies question listeners about interactions with a notification
-   * @param {String} id notification ID
-   * @param {Boolean} approved indicator whether notification has been approved or not
+   * @param {string} id notification ID
+   * @param {boolean} approved indicator whether notification has been approved
    */
-  triggerQuestionListeners: function(id, approved)
+  triggerQuestionListeners(id, approved)
   {
     if (!(id in questionListeners))
       return;
     let listeners = questionListeners[id];
     for (let listener of listeners)
       listener(approved);
   },
 
   /**
    * Toggles whether notifications of a specific category should be ignored
-   * @param {String} category notification category identifier
-   * @param {Boolean} [forceValue] force specified value
+   * @param {string} category notification category identifier
+   * @param {boolean} [forceValue] force specified value
    */
-  toggleIgnoreCategory: function(category, forceValue)
+  toggleIgnoreCategory(category, forceValue)
   {
     let categories = Prefs.notifications_ignoredcategories;
     let index = categories.indexOf(category);
     if (index == -1 && forceValue !== false)
     {
       categories.push(category);
       Prefs.notifications_showui = true;
     }
     else if (index != -1 && forceValue !== true)
       categories.splice(index, 1);
 
-    // HACK: JSON values aren't saved unless they are assigned a different object.
-    Prefs.notifications_ignoredcategories = JSON.parse(JSON.stringify(categories));
+    // HACK: JSON values aren't saved unless they are assigned a
+    // different object.
+    Prefs.notifications_ignoredcategories =
+      JSON.parse(JSON.stringify(categories));
   }
 };
 Notification.init();