Replace the sample Calendar extension with a deprecation notice

chrome/common/extensions/docs/examples/extensions/calendar/javascript/background.js

 /**
  * Copyright (c) 2013 The Chromium Authors. All rights reserved.  Use of this
  * source code is governed by a BSD-style license that can be found in the
  * LICENSE file.
  */
 
-/**
- * PHASES
- * 1) Load next event from server refresh every 30 minutes or every time
- *   you go to calendar or every time you logout drop in a data object.
- * 2) Display on screen periodically once per minute or on demand.
- */
+var warningId = 'notification.warning';
 
-// Message shown in badge title when no title is given to an event.
-var MSG_NO_TITLE = chrome.i18n.getMessage('noTitle');
-
-// Time between server polls = 30 minutes.
-var POLL_INTERVAL = 30 * 60 * 1000;
-
-// Redraw interval is 5 min.
-var DRAW_INTERVAL_MINUTES = 5.0;
-
-// Object for BadgeAnimation
-var badgeAnimation_;
-
-//Object for CanvasAnimation
-var canvasAnimation_;
-
-var pollUnderProgress = false;
-var defaultAuthor = '';
-var isMultiCalendar = false;
-
-// The Calendar API identifies requests from this extension by the 'extid' get
-// parameter, set to this extension's ID.
-var API_KEY = 'extid=' + chrome.runtime.id;
-
-//URL for getting feed of individual calendar support.
-var SINGLE_CALENDAR_SUPPORT_URL = 'https://www.google.com/calendar/feeds' +
-    '/default/private/embed?toolbar=true&max-results=10&' + API_KEY;
-
-//URL for getting feed of multiple calendar support.
-var MULTIPLE_CALENDAR_SUPPORT_URL = 'https://www.google.com/calendar/feeds' +
-    '/default/allcalendars/full?' + API_KEY;
-
-//URL for opening Google Calendar in new tab.
-var GOOGLE_CALENDAR_URL = 'http://www.google.com/calendar/render';
-
-//URL for declining invitation of the event.
-var DECLINED_URL = 'http://schemas.google.com/g/2005#event.declined';
-
-//This is used to poll only once per second at most, and delay that if
-//we keep hitting pages that would otherwise force a load.
-var pendingLoadId_ = null;
-
-/**
- * Sets |key| as |value| in localStorage. |value| may be any JavaScript object;
- * this method will automatically stringify to JSON if needed.
- */
-function localStorageSet(key, value) {
-  if (typeof value == 'undefined') {
-    // Don't try to stringify undefined, or bad things may happen (particularly
-    // in localStorageGet, so let's be consistent).
-    delete localStorage[key];
-  } else {
-    localStorage[key] = JSON.stringify(value);
-  }
+function hideWarning(done) {
+  chrome.notifications.clear(warningId, function() {
+    if (done) done();
+  });
 }
 
-/**
- * Gets the JavaScript object at |key| from localStorage, defaulting to |deflt|
- * if it hasn't been set. Assumes that the value was written by localStorageSet
- * (i.e. stored as JSON).
- */
-function localStorageGet(key, deflt) {
-  var value = localStorage[key];
-  return (typeof value == 'undefined') ? deflt : JSON.parse(value);
+function showWarning() {
+  hideWarning(function() {
+    chrome.notifications.create(warningId, {
+      iconUrl: chrome.runtime.getURL('images/icon-48.png'),
+      title: 'Removal required',
+      type: 'basic',
+      message: chrome.i18n.getMessage('name') + ' is obsolete ' +
+               'and must be removed. A replacement Extension ' +
+               'is available.',
+      buttons: [{ title: 'Learn More' }],
+      isClickable: true,
+      priority: 2,
+    }, function() {});
+  });
 }
 
-/**
- * A "loading" animation displayed while we wait for the first response from
- * Calendar. This animates the badge text with a dot that cycles from left to
- * right.
- * @constructor
- */
-function BadgeAnimation() {
-  this.timerId_ = 0;
-  this.maxCount_ = 8;  // Total number of states in animation
-  this.current_ = 0;  // Current state
-  this.maxDot_ = 4;  // Max number of dots in animation
-};
-
-/**
- * Paints the badge text area while loading the data.
- */
-BadgeAnimation.prototype.paintFrame = function() {
-  var text = '';
-  for (var i = 0; i < this.maxDot_; i++) {
-    text += (i == this.current_) ? '.' : ' ';
-  }
-
-  chrome.browserAction.setBadgeText({text: text});
-  this.current_++;
-  if (this.current_ == this.maxCount_) {
-    this.current_ = 0;
-  }
-};
-
-/**
- * Starts the animation process.
- */
-BadgeAnimation.prototype.start = function() {
-  if (this.timerId_) {
-    return;
-  }
-
-  var self = this;
-  this.timerId_ = window.setInterval(function() {
-    self.paintFrame();
-  }, 100);
-};
-
-/**
- * Stops the animation process.
- */
-BadgeAnimation.prototype.stop = function() {
-  if (!this.timerId_) {
-    return;
-  }
-
-  window.clearInterval(this.timerId_);
-  this.timerId_ = 0;
-};
-
-/**
- * Animates the canvas after loading the data from all the calendars. It
- * rotates the icon and defines the badge text and title.
- * @constructor
- */
-function CanvasAnimation() {
-  this.animationFrames_ = 36;  // The number of animation frames
-  this.animationSpeed_ = 10;  // Time between each frame(in ms).
-  this.canvas_ = $('canvas');  // The canvas width + height.
-  this.canvasContext_ = this.canvas_.getContext('2d');  // Canvas context.
-  this.loggedInImage_ = $('logged_in');
-  this.rotation_ = 0;  //Keeps count of rotation angle of extension icon.
-  this.w = this.canvas_.width;  // Setting canvas width.
-  this.h = this.canvas_.height;  // Setting canvas height.
-  this.RED = [208, 0, 24, 255];  //Badge color of extension icon in RGB format.
-  this.BLUE = [0, 24, 208, 255];
-  this.currentBadge_ = null;  // The text in the current badge.
-};
-
-/**
- * Flips the icon around and draws it.
- */
-CanvasAnimation.prototype.animate = function() {
-  this.rotation_ += (1 / this.animationFrames_);
-  this.drawIconAtRotation();
-  var self = this;
-  if (this.rotation_ <= 1) {
-    setTimeout(function() {
-      self.animate();
-    }, self.animationSpeed_);
-  } else {
-    this.drawFinal();
-  }
-};
-
-/**
- * Renders the icon.
- */
-CanvasAnimation.prototype.drawIconAtRotation = function() {
-  this.canvasContext_.save();
-  this.canvasContext_.clearRect(0, 0, this.w, this.h);
-  this.canvasContext_.translate(Math.ceil(this.w / 2), Math.ceil(this.h / 2));
-  this.canvasContext_.rotate(2 * Math.PI * this.getSector(this.rotation_));
-  this.canvasContext_.drawImage(this.loggedInImage_, -Math.ceil(this.w / 2),
-    -Math.ceil(this.h / 2));
-  this.canvasContext_.restore();
-  chrome.browserAction.setIcon(
-      {imageData: this.canvasContext_.getImageData(0, 0, this.w, this.h)});
-};
-
-/**
- * Calculates the sector which has to be traversed in a single call of animate
- * function(360/animationFrames_ = 360/36 = 10 radians).
- * @param {integer} sector angle to be rotated(in radians).
- * @return {integer} value in radian of the sector which it has to cover.
- */
-CanvasAnimation.prototype.getSector = function(sector) {
-  return (1 - Math.sin(Math.PI / 2 + sector * Math.PI)) / 2;
-};
-
-/**
- * Draws the event icon and determines the badge title and icon title.
- */
-CanvasAnimation.prototype.drawFinal = function() {
-  badgeAnimation_.stop();
-  var nextEvent = localStorageGet('nextEvent');
-  if (!nextEvent) {
-    this.showLoggedOut();
-  } else {
-    this.drawIconAtRotation();
-    this.rotation_ = 0;
-
-    var ms = (new Date(nextEvent.startTime)).getTime() - getCurrentTime();
-    var nextEventMin = ms / (1000 * 60);
-    var bgColor = (nextEventMin < 60) ? this.RED : this.BLUE;
-
-    chrome.browserAction.setBadgeBackgroundColor({color: bgColor});
-    currentBadge_ = this.getBadgeText(nextEvent);
-    chrome.browserAction.setBadgeText({text: currentBadge_});
-    var nextEvents = localStorageGet('nextEvents');
-    if (nextEvents.length > 0) {
-      var text = '';
-      for (var i = 0, event; event = nextEvents[i]; i++) {
-        text += event.title;
-        if (event.author || event.location) {
-          text += '\n';
-        }
-        if (event.location) {
-          text += event.location + ' ';
-        }
-        if (event.author) {
-          text += event.author;
-        }
-        if (i < (nextEvents.length - 1)) {
-          text += '\n----------\n';
-        }
-      }
-      text = filterSpecialChar(text);
-      chrome.browserAction.setTitle({'title' : text});
-    }
-  }
-  pollUnderProgress = false;
-
-  return;
-};
-
-/**
- * Shows the user logged out.
- */
-CanvasAnimation.prototype.showLoggedOut = function() {
-  currentBadge_ = '?';
-  chrome.browserAction.setIcon({path: '../images/icon-16_bw.gif'});
-  chrome.browserAction.setBadgeBackgroundColor({color: [190, 190, 190, 230]});
-  chrome.browserAction.setBadgeText({text: '?'});
-  chrome.browserAction.setTitle({ 'title' : ''});
-};
-
-/**
- * Gets the badge text.
- * @param {Object} nextEvent next event in the calendar.
- * @return {String} text Badge text to be shown in extension icon.
- */
-CanvasAnimation.prototype.getBadgeText = function(nextEvent) {
-  if (!nextEvent) {
-    return '';
-  }
-
-  var ms = (new Date(nextEvent.startTime)).getTime() - getCurrentTime();
-  var nextEventMin = Math.ceil(ms / (1000 * 60));
-
-  var text = '';
-  if (nextEventMin < 60) {
-    text = chrome.i18n.getMessage('minutes', nextEventMin.toString());
-  } else if (nextEventMin < 1440) {
-    text = chrome.i18n.getMessage('hours',
-               Math.round(nextEventMin / 60).toString());
-  } else if (nextEventMin < (1440 * 10)) {
-    text = chrome.i18n.getMessage('days',
-               Math.round(nextEventMin / 60 / 24).toString());
-  }
-  return text;
-};
-
-/**
- * Provides all the calendar related utils.
- */
-CalendarManager = {};
-
-/**
- * Extracts event from the each entry of the calendar.
- * @param {Object} elem The XML node to extract the event from.
- * @param {Object} mailId email of the owner of calendar in multiple calendar
- *     support.
- * @return {Object} out An object containing the event properties.
- */
-CalendarManager.extractEvent = function(elem, mailId) {
-  var out = {};
-
-  for (var node = elem.firstChild; node != null; node = node.nextSibling) {
-    if (node.nodeName == 'title') {
-        out.title = node.firstChild ? node.firstChild.nodeValue : MSG_NO_TITLE;
-    } else if (node.nodeName == 'link' &&
-               node.getAttribute('rel') == 'alternate') {
-      out.url = node.getAttribute('href');
-    } else if (node.nodeName == 'gd:where') {
-      out.location = node.getAttribute('valueString');
-    } else if (node.nodeName == 'gd:who') {
-      if (node.firstChild) {
-        if ((!isMultiCalendar) || (isMultiCalendar && mailId &&
-            node.getAttribute('email') == mailId)) {
-          out.attendeeStatus = node.firstChild.getAttribute('value');
-        }
-      }
-    } else if (node.nodeName == 'gd:eventStatus') {
-      out.status = node.getAttribute('value');
-    } else if (node.nodeName == 'gd:when') {
-      var startTimeStr = node.getAttribute('startTime');
-      var endTimeStr = node.getAttribute('endTime');
-
-      startTime = rfc3339StringToDate(startTimeStr);
-      endTime = rfc3339StringToDate(endTimeStr);
-
-      if (startTime == null || endTime == null) {
-        continue;
-      }
-
-      out.isAllDay = (startTimeStr.length <= 11);
-      out.startTime = startTime;
-      out.endTime = endTime;
-    }
-  }
-  return out;
-};
-
-/**
- * Polls the server to get the feed of the user.
- */
-CalendarManager.pollServer = function() {
-  if (! pollUnderProgress) {
-    localStorageSet('eventList', []);
-    pollUnderProgress = true;
-    pendingLoadId_ = null;
-    localStorageSet('calendars', []);
-    localStorageSet('lastPollTime', getCurrentTime());
-    var url;
-    var xhr = new XMLHttpRequest();
-    try {
-      xhr.onreadystatechange = CalendarManager.genResponseChangeFunc(xhr);
-      xhr.onerror = function(error) {
-        console.error('error:', error);
-        localStorageSet('nextEvent', null);
-        canvasAnimation_.drawFinal();
-      };
-      if (isMultiCalendar) {
-        url = MULTIPLE_CALENDAR_SUPPORT_URL;
-      } else {
-        url = SINGLE_CALENDAR_SUPPORT_URL;
-      }
-
-      xhr.open('GET', url);
-      xhr.send(null);
-    } catch (e) {
-      console.error('ex:', e);
-      localStorageSet('nextEvent', null);
-      canvasAnimation_.drawFinal();
-    }
-  }
-};
-
-/**
- * Gathers the list of all calendars of a specific user for multiple calendar
- * support and event entries in single calendar.
- * @param {xmlHttpRequest} xhr xmlHttpRequest object containing server response.
- * @return {Object} anonymous function which returns to onReadyStateChange.
- */
-CalendarManager.genResponseChangeFunc = function(xhr) {
-  return function() {
-    if (xhr.readyState != 4) {
-      return;
-    }
-    if (!xhr.responseXML) {
-      console.log('No responseXML');
-      localStorageSet('nextEvent', null);
-      canvasAnimation_.drawFinal();
-      return;
-    }
-    if (isMultiCalendar) {
-      var entry_ = xhr.responseXML.getElementsByTagName('entry');
-      if (entry_ && entry_.length > 0) {
-        var calendars = [];
-        for (var i = 0, entry; entry = entry_[i]; ++i) {
-          if (!i) {
-            defaultAuthor = entry.querySelector('title').textContent;
-          }
-          // Include only those calendars which are not hidden and selected
-          var isHidden = entry.querySelector('hidden');
-          var isSelected = entry.querySelector('selected');
-          if (isHidden && isHidden.getAttribute('value') == 'false') {
-            if (isSelected && isSelected.getAttribute('value') == 'true') {
-              var calendar_content = entry.querySelector('content');
-              var cal_src = calendar_content.getAttribute('src');
-              cal_src += '?toolbar=true&max-results=10';
-              calendars.push(cal_src);
-            }
-          }
-        }
-        localStorageSet('calendars', calendars);
-        CalendarManager.getCalendarFeed(0);
-        return;
-      }
-    } else {
-      var calendars = [];
-      calendars.push(SINGLE_CALENDAR_SUPPORT_URL);
-      localStorageSet('calendars', calendars);
-      CalendarManager.parseCalendarEntry(xhr.responseXML, 0);
-      return;
-    }
-
-    console.error('Error: feed retrieved, but no event found');
-    localStorageSet('nextEvent', null);
-    canvasAnimation_.drawFinal();
-  };
-};
-
-/**
- * Retrieves feed for a calendar
- * @param {integer} calendarId Id of the calendar in array of calendars.
- */
-CalendarManager.getCalendarFeed = function(calendarId) {
-  var xmlhttp = new XMLHttpRequest();
-  try {
-    xmlhttp.onreadystatechange = CalendarManager.onCalendarResponse(xmlhttp,
-                                     calendarId);
-    xmlhttp.onerror = function(error) {
-      console.error('error:', error);
-      localStorageSet('nextEvent', null);
-      canvasAnimation_.drawFinal();
-    };
-
-    // Augment the calendar's URL with the API key.
-    var calendarUrl = localStorageGet('calendars')[calendarId] + '&' + API_KEY;
-    xmlhttp.open('GET', calendarUrl);
-    xmlhttp.send(null);
-  }
-  catch (e) {
-    console.error('ex:', e);
-    localStorageSet('nextEvent', null);
-    canvasAnimation_.drawFinal();
-  }
-};
-
-/**
- * Gets the event entries of every calendar subscribed in default user calendar.
- * @param {xmlHttpRequest} xmlhttp xmlHttpRequest containing server response
- *     for the feed of a specific calendar.
- * @param {integer} calendarId Variable for storing the no of calendars
- *     processed.
- * @return {Object} anonymous function which returns to onReadyStateChange.
- */
-CalendarManager.onCalendarResponse = function(xmlhttp, calendarId) {
-  return function() {
-    if (xmlhttp.readyState != 4) {
-      return;
-    }
-    if (!xmlhttp.responseXML) {
-      console.log('No responseXML');
-      localStorageSet('nextEvent', null);
-      canvasAnimation_.drawFinal();
-      return;
-    }
-    CalendarManager.parseCalendarEntry(xmlhttp.responseXML, calendarId);
-  };
-};
-
-/**
- * Parses events from calendar response XML
- * @param {string} responseXML Response XML for calendar.
- * @param {integer} calendarId  Id of the calendar in array of calendars.
- */
-CalendarManager.parseCalendarEntry = function(responseXML, calendarId) {
-  var entry_ = responseXML.getElementsByTagName('entry');
-  var mailId = null;
-  var author = null;
-
-  if (responseXML.querySelector('author name')) {
-    author = responseXML.querySelector('author name').textContent;
-  }
-  if (responseXML.querySelector('author email')) {
-    mailId = responseXML.querySelector('author email').textContent;
-  }
-
-  if (entry_ && entry_.length > 0) {
-    var eventList = localStorageGet('eventList', []);
-    for (var i = 0, entry; entry = entry_[i]; ++i) {
-     var event_ = CalendarManager.extractEvent(entry, mailId);
-
-      // Get the time from then to now
-      if (event_.startTime) {
-        var t = event_.startTime.getTime() - getCurrentTime();
-        if (t >= 0 && (event_.attendeeStatus != DECLINED_URL)) {
-            if (isMultiCalendar && author) {
-              event_.author = author;
-            }
-            eventList.push(event_);
-        }
-      }
-    }
-    localStorageSet('eventList', eventList);
-  }
-
-  calendarId++;
-  //get the next calendar
-  if (calendarId < localStorageGet('calendars', []).length) {
-    CalendarManager.getCalendarFeed(calendarId);
-  } else {
-    CalendarManager.populateLatestEvent(localStorageGet('eventList', []));
-  }
-};
-
-/**
- * Fills the event list with the events acquired from the calendar(s).
- * Parses entire event list and prepares an array of upcoming events.
- * @param {Array} eventList List of all events.
- */
-CalendarManager.populateLatestEvent = function(eventList) {
-  var nextEvents = [];
-  if (isMultiCalendar) {
-    eventList.sort(sortByDate);
-  }
-
-  //populating next events array.
-  if (eventList.length > 0) {
-    nextEvent = localStorageGet('nextEvent');
-    nextEvent = eventList[0];
-    nextEvents.push(nextEvent);
-    var startTime = (new Date(nextEvent.startTime)).setSeconds(0, 0);
-    for (var i = 1, event; event = eventList[i]; i++) {
-      var time = (new Date(event.startTime)).setSeconds(0, 0);
-      if (time == startTime) {
-        nextEvents.push(event);
-      } else {
-        break;
-      }
-    }
-    if (nextEvents.length > 1 && isMultiCalendar) {
-      nextEvents.sort(sortByAuthor);
-    }
-    localStorageSet('nextEvents', nextEvents);
-    localStorageSet('nextEvent', nextEvent);
-    canvasAnimation_.animate();
-    return;
-  } else {
-    console.error('Error: feed retrieved, but no event found');
-    localStorageSet('nextEvent', null);
-    localStorageSet('nextEvents', nextEvents);
-    canvasAnimation_.drawFinal();
-  }
-};
-
-var DATE_TIME_REGEX =
-  /^(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)\.\d+(\+|-)(\d\d):(\d\d)$/;
-var DATE_TIME_REGEX_Z = /^(\d\d\d\d)-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d)\.\d+Z$/;
-var DATE_REGEX = /^(\d\d\d\d)-(\d\d)-(\d\d)$/;
-
-/**
-* Convert the incoming date into a javascript date.
-* @param {String} rfc3339 The rfc date in string format as following
-*     2006-04-28T09:00:00.000-07:00
-*     2006-04-28T09:00:00.000Z
-*     2006-04-19.
-* @return {Date} The javascript date format of the incoming date.
-*/
-function rfc3339StringToDate(rfc3339) {
-  var parts = DATE_TIME_REGEX.exec(rfc3339);
-
-  // Try out the Z version
-  if (!parts) {
-    parts = DATE_TIME_REGEX_Z.exec(rfc3339);
-  }
-
-  if (parts && parts.length > 0) {
-    var d = new Date();
-    d.setUTCFullYear(parts[1], parseInt(parts[2], 10) - 1, parts[3]);
-    d.setUTCHours(parts[4]);
-    d.setUTCMinutes(parts[5]);
-    d.setUTCSeconds(parts[6]);
-
-    var tzOffsetFeedMin = 0;
-    if (parts.length > 7) {
-      tzOffsetFeedMin = parseInt(parts[8], 10) * 60 + parseInt(parts[9], 10);
-      if (parts[7] != '-') { // This is supposed to be backwards.
-        tzOffsetFeedMin = -tzOffsetFeedMin;
-      }
-    }
-    return new Date(d.getTime() + tzOffsetFeedMin * 60 * 1000);
-  }
-
-  parts = DATE_REGEX.exec(rfc3339);
-  if (parts && parts.length > 0) {
-    return new Date(parts[1], parseInt(parts[2], 10) - 1, parts[3]);
-  }
-  return null;
-};
-
-/**
- * Sorts all the events by date and time.
- * @param {object} event_1 Event object.
- * @param {object} event_2 Event object.
- * @return {integer} timeDiff Difference in time.
- */
-function sortByDate(event_1, event_2) {
-  return ((new Date(event_1.startTime)).getTime() -
-          (new Date(event_2.startTime)).getTime());
-};
-
-/**
- * Sorts all the events by author name.
- * @param {object} event_1 Event object.
- * @param {object} event_2 Event object.
- * @return {integer} nameDiff Difference in default author and others.
- */
-function sortByAuthor(event_1, event_2) {
-  var nameDiff;
-  if (event_1.author && event_2.author && event_2.author == defaultAuthor) {
-    nameDiff = 1;
-  } else {
-    return 0;
-  }
-  return nameDiff;
-};
-
-/**
- * Fires once per minute to redraw extension icon.
- */
-function redraw() {
-  // If the next event just passed, re-poll.
-  var nextEvent = localStorageGet('nextEvent');
-  if (nextEvent) {
-    var t = (new Date(nextEvent.startTime)).getTime() - getCurrentTime();
-    if (t <= 0) {
-      CalendarManager.pollServer();
-      return;
-    }
-  }
-  canvasAnimation_.drawFinal();
-
-  // if 30 minutes have passed re-poll
-  if (getCurrentTime() - localStorageGet('lastPollTime') >= POLL_INTERVAL) {
-    CalendarManager.pollServer();
-  }
-};
-
-/**
- * Returns the current time in milliseconds.
- * @return {Number} Current time in milliseconds.
- */
-function getCurrentTime() {
-  return (new Date()).getTime();
-};
-
-/**
-* Replaces ASCII characters from the title.
-* @param {String} data String containing ASCII code for special characters.
-* @return {String} data ASCII characters replaced with actual characters.
-*/
-function filterSpecialChar(data) {
-  if (data) {
-    data = data.replace(/&lt;/g, '<');
-    data = data.replace(/&gt;/g, '>');
-    data = data.replace(/&amp;/g, '&');
-    data = data.replace(/%7B/g, '{');
-    data = data.replace(/%7D/g, '}');
-    data = data.replace(/&quot;/g, '"');
-    data = data.replace(/&#39;/g, '\'');
-  }
-  return data;
-};
-
-/**
- * Called from options.js page on saving the settings
- */
-function onSettingsChange() {
-  isMultiCalendar = localStorageGet('multiCalendar', false);
-  badgeAnimation_.start();
-  CalendarManager.pollServer();
-};
-
-/**
- * Function runs on completed navigation with a url of google applications.
- * @param {details} details of the completed web navigation.
- */
-function onCompleted(details) {
-  var url = details.url;
-
-  if ((url.indexOf('www.google.com/calendar/') != -1) ||
-      ((url.indexOf('www.google.com/a/') != -1) &&
-      (url.lastIndexOf('/acs') == url.length - 4)) ||
-      (url.indexOf('www.google.com/accounts/') != -1)) {
-
-    if (pendingLoadId_) {
-      clearTimeout(pendingLoadId_);
-      pendingLoadId_ = null;
-    }
-
-    // try to poll in 2 second [which makes the redirects settle down]
-    pendingLoadId_ = setTimeout(CalendarManager.pollServer, 2000);
-  }
-};
-
-/**
- * Called when the user clicks on extension icon and opens calendar page.
- */
-function onClickAction() {
-  chrome.tabs.getAllInWindow(null, function(tabs) {
-    for (var i = 0, tab; tab = tabs[i]; i++) {
-      if (tab.url && isCalendarUrl(tab.url)) {
-        chrome.tabs.update(tab.id, {selected: true});
-        CalendarManager.pollServer();
-        return;
-      }
-    }
-    chrome.tabs.create({url: GOOGLE_CALENDAR_URL});
-    CalendarManager.pollServer();
+function openWarningPage() {
+  chrome.tabs.create({
+    url: 'chrome://extensions?options=' + chrome.runtime.id
   });
-};
-
-/**
- * Checks whether an instance of Google calendar is already open.
- * @param {String} url Url of the tab visited.
- * @return {boolean} true if the url is a Google calendar relative url, false
- *     otherwise.
- */
-function isCalendarUrl(url) {
-  return url.indexOf('www.google.com/calendar') != -1 ? true : false;
-};
-
-function onInstalled() {
-  badgeAnimation_.start();
-  CalendarManager.pollServer();
-  localStorageSet('lastPollTime', 0);
-  localStorageSet('nextEvent', null);
 }
 
-/*
- * Load animation contexts and add listeners.
- */
-badgeAnimation_ = new BadgeAnimation();
-canvasAnimation_ = new CanvasAnimation();
-isMultiCalendar = localStorageGet('multiCalendar', false);
-chrome.browserAction.setIcon({path: '../images/icon-16.gif'});
-chrome.runtime.onInstalled.addListener(onInstalled);
-chrome.alarms.onAlarm.addListener(redraw)
-chrome.alarms.create('redraw', {periodInMinutes: DRAW_INTERVAL_MINUTES});
-chrome.webNavigation.onCompleted.addListener(onCompleted,
-    {url: [{hostSuffix: 'www.google.com', pathPrefix: '/calendar'},
-           {hostSuffix: 'www.google.com', pathPrefix: '/accounts'},
-           {hostSuffix: 'www.google.com', pathPrefix: '/a'}]});
-chrome.browserAction.onClicked.addListener(onClickAction);
-redraw();
+chrome.browserAction.setBadgeBackgroundColor({ color: '#FF0000' });
+chrome.browserAction.setBadgeText({ text: '!' });
+chrome.browserAction.onClicked.addListener(openWarningPage);
+chrome.notifications.onClicked.addListener(openWarningPage);
+chrome.notifications.onButtonClicked.addListener(openWarningPage);
+chrome.runtime.onInstalled.addListener(showWarning);