The Tor Browser: browser/base/content/abouthome/aboutHome.js@a63d609f5ebe

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 const SEARCH_ENGINES = {

     6   "Google": {

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   134   }

   135 };

   137 // The process of adding a new default snippet involves:

   138 //   * add a new entity to aboutHome.dtd

   139 //   * add a <span/> for it in aboutHome.xhtml

   140 //   * add an entry here in the proper ordering (based on spans)

   141 // The <a/> part of the snippet will be linked to the corresponding url.

   142 const DEFAULT_SNIPPETS_URLS = [

   143   "https://www.mozilla.org/firefox/features/?utm_source=snippet&utm_medium=snippet&utm_campaign=default+feature+snippet"

   144 , "https://addons.mozilla.org/firefox/?utm_source=snippet&utm_medium=snippet&utm_campaign=addons"

   145 ];

   147 const SNIPPETS_UPDATE_INTERVAL_MS = 86400000; // 1 Day.

   149 // IndexedDB storage constants.

   150 const DATABASE_NAME = "abouthome";

   151 const DATABASE_VERSION = 1;

   152 const SNIPPETS_OBJECTSTORE_NAME = "snippets";

   154 // This global tracks if the page has been set up before, to prevent double inits

   155 let gInitialized = false;

   156 let gObserver = new MutationObserver(function (mutations) {

   157   for (let mutation of mutations) {

   158     if (mutation.attributeName == "searchEngineName") {

   159       setupSearchEngine();

   160       if (!gInitialized) {

   161         ensureSnippetsMapThen(loadSnippets);

   162         gInitialized = true;

   163       }

   164       return;

   165     }

   166   }

   167 });

   169 window.addEventListener("pageshow", function () {

   170   // Delay search engine setup, cause browser.js::BrowserOnAboutPageLoad runs

   171   // later and may use asynchronous getters.

   172   window.gObserver.observe(document.documentElement, { attributes: true });

   173   fitToWidth();

   174   window.addEventListener("resize", fitToWidth);

   176   // Ask chrome to update snippets.

   177   var event = new CustomEvent("AboutHomeLoad", {bubbles:true});

   178   document.dispatchEvent(event);

   179 });

   181 window.addEventListener("pagehide", function() {

   182   window.gObserver.disconnect();

   183   window.removeEventListener("resize", fitToWidth);

   184 });

   186 // This object has the same interface as Map and is used to store and retrieve

   187 // the snippets data.  It is lazily initialized by ensureSnippetsMapThen(), so

   188 // be sure its callback returned before trying to use it.

   189 let gSnippetsMap;

   190 let gSnippetsMapCallbacks = [];

   192 /**

   193  * Ensure the snippets map is properly initialized.

   194  *

   195  * @param aCallback

   196  *        Invoked once the map has been initialized, gets the map as argument.

   197  * @note Snippets should never directly manage the underlying storage, since

   198  *       it may change inadvertently.

   199  */

   200 function ensureSnippetsMapThen(aCallback)

   201 {

   202   if (gSnippetsMap) {

   203     aCallback(gSnippetsMap);

   204     return;

   205   }

   207   // Handle multiple requests during the async initialization.

   208   gSnippetsMapCallbacks.push(aCallback);

   209   if (gSnippetsMapCallbacks.length > 1) {

   210     // We are already updating, the callbacks will be invoked when done.

   211     return;

   212   }

   214   let invokeCallbacks = function () {

   215     if (!gSnippetsMap) {

   216       gSnippetsMap = Object.freeze(new Map());

   217     }

   219     for (let callback of gSnippetsMapCallbacks) {

   220       callback(gSnippetsMap);

   221     }

   222     gSnippetsMapCallbacks.length = 0;

   223   }

   225   let openRequest = indexedDB.open(DATABASE_NAME, DATABASE_VERSION);

   227   openRequest.onerror = function (event) {

   228     // Try to delete the old database so that we can start this process over

   229     // next time.

   230     indexedDB.deleteDatabase(DATABASE_NAME);

   231     invokeCallbacks();

   232   };

   234   openRequest.onupgradeneeded = function (event) {

   235     let db = event.target.result;

   236     if (!db.objectStoreNames.contains(SNIPPETS_OBJECTSTORE_NAME)) {

   237       db.createObjectStore(SNIPPETS_OBJECTSTORE_NAME);

   238     }

   239   }

   241   openRequest.onsuccess = function (event) {

   242     let db = event.target.result;

   244     db.onerror = function (event) {

   245       invokeCallbacks();

   246     }

   248     db.onversionchange = function (event) {

   249       event.target.close();

   250       invokeCallbacks();

   251     }

   253     let cache = new Map();

   254     let cursorRequest = db.transaction(SNIPPETS_OBJECTSTORE_NAME)

   255                           .objectStore(SNIPPETS_OBJECTSTORE_NAME).openCursor();

   256     cursorRequest.onerror = function (event) {

   257       invokeCallbacks();

   258     }

   260     cursorRequest.onsuccess = function(event) {

   261       let cursor = event.target.result;

   263       // Populate the cache from the persistent storage.

   264       if (cursor) {

   265         cache.set(cursor.key, cursor.value);

   266         cursor.continue();

   267         return;

   268       }

   270       // The cache has been filled up, create the snippets map.

   271       gSnippetsMap = Object.freeze({

   272         get: function (aKey) cache.get(aKey),

   273         set: function (aKey, aValue) {

   274           db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")

   275             .objectStore(SNIPPETS_OBJECTSTORE_NAME).put(aValue, aKey);

   276           return cache.set(aKey, aValue);

   277         },

   278         has: function (aKey) cache.has(aKey),

   279         delete: function (aKey) {

   280           db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")

   281             .objectStore(SNIPPETS_OBJECTSTORE_NAME).delete(aKey);

   282           return cache.delete(aKey);

   283         },

   284         clear: function () {

   285           db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")

   286             .objectStore(SNIPPETS_OBJECTSTORE_NAME).clear();

   287           return cache.clear();

   288         },

   289         get size() cache.size

   290       });

   292       setTimeout(invokeCallbacks, 0);

   293     }

   294   }

   295 }

   297 function onSearchSubmit(aEvent)

   298 {

   299   let searchTerms = document.getElementById("searchText").value;

   300   let engineName = document.documentElement.getAttribute("searchEngineName");

   302   if (engineName && searchTerms.length > 0) {

   303     // Send an event that will perform a search and Firefox Health Report will

   304     // record that a search from about:home has occurred.

   305     let eventData = JSON.stringify({

   306       engineName: engineName,

   307       searchTerms: searchTerms

   308     });

   309     let event = new CustomEvent("AboutHomeSearchEvent", {detail: eventData});

   310     document.dispatchEvent(event);

   311   }

   313   aEvent.preventDefault();

   314 }

   317 function setupSearchEngine()

   318 {

   319   // The "autofocus" attribute doesn't focus the form element

   320   // immediately when the element is first drawn, so the

   321   // attribute is also used for styling when the page first loads.

   322   let searchText = document.getElementById("searchText");

   323   searchText.addEventListener("blur", function searchText_onBlur() {

   324     searchText.removeEventListener("blur", searchText_onBlur);

   325     searchText.removeAttribute("autofocus");

   326   });

   328   let searchEngineName = document.documentElement.getAttribute("searchEngineName");

   329   let searchEngineInfo = SEARCH_ENGINES[searchEngineName];

   330   let logoElt = document.getElementById("searchEngineLogo");

   332   // Add search engine logo.

   333   if (searchEngineInfo && searchEngineInfo.image) {

   334     logoElt.parentNode.hidden = false;

   335     logoElt.src = searchEngineInfo.image;

   336     logoElt.alt = searchEngineName;

   337     searchText.placeholder = "";

   338   }

   339   else {

   340     logoElt.parentNode.hidden = true;

   341     searchText.placeholder = searchEngineName;

   342   }

   344 }

   346 /**

   347  * Inform the test harness that we're done loading the page.

   348  */

   349 function loadSucceeded()

   350 {

   351   var event = new CustomEvent("AboutHomeLoadSnippetsSucceeded", {bubbles:true});

   352   document.dispatchEvent(event);

   353 }

   355 /**

   356  * Update the local snippets from the remote storage, then show them through

   357  * showSnippets.

   358  */

   359 function loadSnippets()

   360 {

   361   if (!gSnippetsMap)

   362     throw new Error("Snippets map has not properly been initialized");

   364   // Allow tests to modify the snippets map before using it.

   365   var event = new CustomEvent("AboutHomeLoadSnippets", {bubbles:true});

   366   document.dispatchEvent(event);

   368   // Check cached snippets version.

   369   let cachedVersion = gSnippetsMap.get("snippets-cached-version") || 0;

   370   let currentVersion = document.documentElement.getAttribute("snippetsVersion");

   371   if (cachedVersion < currentVersion) {

   372     // The cached snippets are old and unsupported, restart from scratch.

   373     gSnippetsMap.clear();

   374   }

   376   // Check last snippets update.

   377   let lastUpdate = gSnippetsMap.get("snippets-last-update");

   378   let updateURL = document.documentElement.getAttribute("snippetsURL");

   379   let shouldUpdate = !lastUpdate ||

   380                      Date.now() - lastUpdate > SNIPPETS_UPDATE_INTERVAL_MS;

   381   if (updateURL && shouldUpdate) {

   382     // Try to update from network.

   383     let xhr = new XMLHttpRequest();

   384     try {

   385       xhr.open("GET", updateURL, true);

   386     } catch (ex) {

   387       showSnippets();

   388       loadSucceeded();

   389       return;

   390     }

   391     // Even if fetching should fail we don't want to spam the server, thus

   392     // set the last update time regardless its results.  Will retry tomorrow.

   393     gSnippetsMap.set("snippets-last-update", Date.now());

   394     xhr.onerror = function (event) {

   395       showSnippets();

   396     };

   397     xhr.onload = function (event)

   398     {

   399       if (xhr.status == 200) {

   400         gSnippetsMap.set("snippets", xhr.responseText);

   401         gSnippetsMap.set("snippets-cached-version", currentVersion);

   402       }

   403       showSnippets();

   404       loadSucceeded();

   405     };

   406     xhr.send(null);

   407   } else {

   408     showSnippets();

   409     loadSucceeded();

   410   }

   411 }

   413 /**

   414  * Shows locally cached remote snippets, or default ones when not available.

   415  *

   416  * @note: snippets should never invoke showSnippets(), or they may cause

   417  *        a "too much recursion" exception.

   418  */

   419 let _snippetsShown = false;

   420 function showSnippets()

   421 {

   422   let snippetsElt = document.getElementById("snippets");

   424   // Show about:rights notification, if needed.

   425   let showRights = document.documentElement.getAttribute("showKnowYourRights");

   426   if (showRights) {

   427     let rightsElt = document.getElementById("rightsSnippet");

   428     let anchor = rightsElt.getElementsByTagName("a")[0];

   429     anchor.href = "about:rights";

   430     snippetsElt.appendChild(rightsElt);

   431     rightsElt.removeAttribute("hidden");

   432     return;

   433   }

   435   if (!gSnippetsMap)

   436     throw new Error("Snippets map has not properly been initialized");

   437   if (_snippetsShown) {

   438     // There's something wrong with the remote snippets, just in case fall back

   439     // to the default snippets.

   440     showDefaultSnippets();

   441     throw new Error("showSnippets should never be invoked multiple times");

   442   }

   443   _snippetsShown = true;

   445   let snippets = gSnippetsMap.get("snippets");

   446   // If there are remotely fetched snippets, try to to show them.

   447   if (snippets) {

   448     // Injecting snippets can throw if they're invalid XML.

   449     try {

   450       snippetsElt.innerHTML = snippets;

   451       // Scripts injected by innerHTML are inactive, so we have to relocate them

   452       // through DOM manipulation to activate their contents.

   453       Array.forEach(snippetsElt.getElementsByTagName("script"), function(elt) {

   454         let relocatedScript = document.createElement("script");

   455         relocatedScript.type = "text/javascript;version=1.8";

   456         relocatedScript.text = elt.text;

   457         elt.parentNode.replaceChild(relocatedScript, elt);

   458       });

   459       return;

   460     } catch (ex) {

   461       // Bad content, continue to show default snippets.

   462     }

   463   }

   465   showDefaultSnippets();

   466 }

   468 /**

   469  * Clear snippets element contents and show default snippets.

   470  */

   471 function showDefaultSnippets()

   472 {

   473   // Clear eventual contents...

   474   let snippetsElt = document.getElementById("snippets");

   475   snippetsElt.innerHTML = "";

   477   // ...then show default snippets.

   478   let defaultSnippetsElt = document.getElementById("defaultSnippets");

   479   let entries = defaultSnippetsElt.querySelectorAll("span");

   480   // Choose a random snippet.  Assume there is always at least one.

   481   let randIndex = Math.floor(Math.random() * entries.length);

   482   let entry = entries[randIndex];

   483   // Inject url in the eventual link.

   484   if (DEFAULT_SNIPPETS_URLS[randIndex]) {

   485     let links = entry.getElementsByTagName("a");

   486     // Default snippets can have only one link, otherwise something is messed

   487     // up in the translation.

   488     if (links.length == 1) {

   489       links[0].href = DEFAULT_SNIPPETS_URLS[randIndex];

   490     }

   491   }

   492   // Move the default snippet to the snippets element.

   493   snippetsElt.appendChild(entry);

   494 }

   496 function fitToWidth() {

   497   if (window.scrollMaxX) {

   498     document.body.setAttribute("narrow", "true");

   499   } else if (document.body.hasAttribute("narrow")) {

   500     document.body.removeAttribute("narrow");

   501     fitToWidth();

   502   }

   503 }

The Tor Browser / file revision

browser/base/content/abouthome/aboutHome.js@a63d609f5ebe

browser/base/content/abouthome/aboutHome.js