The Tor Browser: browser/base/content/abouthome/aboutHome.js@8bccb770b82d (annotated)

browser/base/content/abouthome/aboutHome.js@8bccb770b82d (annotated)

browser/base/content/abouthome/aboutHome.js

Wed, 31 Dec 2014 13:27:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 13:27:57 +0100
branch: TOR_BUG_3246
changeset 6: 8bccb770b82d
permissions: -rw-r--r--

Ignore runtime configuration files generated during quality assurance.

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 const SEARCH_ENGINES = {
   "Google": {
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   }
 };
 // The process of adding a new default snippet involves:
 //   * add a new entity to aboutHome.dtd
 //   * add a <span/> for it in aboutHome.xhtml
 //   * add an entry here in the proper ordering (based on spans)
 // The <a/> part of the snippet will be linked to the corresponding url.
 const DEFAULT_SNIPPETS_URLS = [
   "https://www.mozilla.org/firefox/features/?utm_source=snippet&utm_medium=snippet&utm_campaign=default+feature+snippet"
 , "https://addons.mozilla.org/firefox/?utm_source=snippet&utm_medium=snippet&utm_campaign=addons"
 ];
 const SNIPPETS_UPDATE_INTERVAL_MS = 86400000; // 1 Day.
 // IndexedDB storage constants.
 const DATABASE_NAME = "abouthome";
 const DATABASE_VERSION = 1;
 const SNIPPETS_OBJECTSTORE_NAME = "snippets";
 // This global tracks if the page has been set up before, to prevent double inits
 let gInitialized = false;
 let gObserver = new MutationObserver(function (mutations) {
   for (let mutation of mutations) {
     if (mutation.attributeName == "searchEngineName") {
       setupSearchEngine();
       if (!gInitialized) {
         ensureSnippetsMapThen(loadSnippets);
         gInitialized = true;
       }
       return;
     }
   }
 });
 window.addEventListener("pageshow", function () {
   // Delay search engine setup, cause browser.js::BrowserOnAboutPageLoad runs
   // later and may use asynchronous getters.
   window.gObserver.observe(document.documentElement, { attributes: true });
   fitToWidth();
   window.addEventListener("resize", fitToWidth);
   // Ask chrome to update snippets.
   var event = new CustomEvent("AboutHomeLoad", {bubbles:true});
   document.dispatchEvent(event);
 });
 window.addEventListener("pagehide", function() {
   window.gObserver.disconnect();
   window.removeEventListener("resize", fitToWidth);
 });
 // This object has the same interface as Map and is used to store and retrieve
 // the snippets data.  It is lazily initialized by ensureSnippetsMapThen(), so
 // be sure its callback returned before trying to use it.
 let gSnippetsMap;
 let gSnippetsMapCallbacks = [];
 /**
  * Ensure the snippets map is properly initialized.
  *
  * @param aCallback
  *        Invoked once the map has been initialized, gets the map as argument.
  * @note Snippets should never directly manage the underlying storage, since
  *       it may change inadvertently.
  */
 function ensureSnippetsMapThen(aCallback)
 {
   if (gSnippetsMap) {
     aCallback(gSnippetsMap);
     return;
   }
   // Handle multiple requests during the async initialization.
   gSnippetsMapCallbacks.push(aCallback);
   if (gSnippetsMapCallbacks.length > 1) {
     // We are already updating, the callbacks will be invoked when done.
     return;
   }
   let invokeCallbacks = function () {
     if (!gSnippetsMap) {
       gSnippetsMap = Object.freeze(new Map());
     }
     for (let callback of gSnippetsMapCallbacks) {
       callback(gSnippetsMap);
     }
     gSnippetsMapCallbacks.length = 0;
   }
   let openRequest = indexedDB.open(DATABASE_NAME, DATABASE_VERSION);
   openRequest.onerror = function (event) {
     // Try to delete the old database so that we can start this process over
     // next time.
     indexedDB.deleteDatabase(DATABASE_NAME);
     invokeCallbacks();
   };
   openRequest.onupgradeneeded = function (event) {
     let db = event.target.result;
     if (!db.objectStoreNames.contains(SNIPPETS_OBJECTSTORE_NAME)) {
       db.createObjectStore(SNIPPETS_OBJECTSTORE_NAME);
     }
   }
   openRequest.onsuccess = function (event) {
     let db = event.target.result;
     db.onerror = function (event) {
       invokeCallbacks();
     }
     db.onversionchange = function (event) {
       event.target.close();
       invokeCallbacks();
     }
     let cache = new Map();
     let cursorRequest = db.transaction(SNIPPETS_OBJECTSTORE_NAME)
                           .objectStore(SNIPPETS_OBJECTSTORE_NAME).openCursor();
     cursorRequest.onerror = function (event) {
       invokeCallbacks();
     }
     cursorRequest.onsuccess = function(event) {
       let cursor = event.target.result;
       // Populate the cache from the persistent storage.
       if (cursor) {
         cache.set(cursor.key, cursor.value);
         cursor.continue();
         return;
       }
       // The cache has been filled up, create the snippets map.
       gSnippetsMap = Object.freeze({
         get: function (aKey) cache.get(aKey),
         set: function (aKey, aValue) {
           db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")
             .objectStore(SNIPPETS_OBJECTSTORE_NAME).put(aValue, aKey);
           return cache.set(aKey, aValue);
         },
         has: function (aKey) cache.has(aKey),
         delete: function (aKey) {
           db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")
             .objectStore(SNIPPETS_OBJECTSTORE_NAME).delete(aKey);
           return cache.delete(aKey);
         },
         clear: function () {
           db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")
             .objectStore(SNIPPETS_OBJECTSTORE_NAME).clear();
           return cache.clear();
         },
         get size() cache.size
       });
       setTimeout(invokeCallbacks, 0);
     }
   }
 }
 function onSearchSubmit(aEvent)
 {
   let searchTerms = document.getElementById("searchText").value;
   let engineName = document.documentElement.getAttribute("searchEngineName");
   if (engineName && searchTerms.length > 0) {
     // Send an event that will perform a search and Firefox Health Report will
     // record that a search from about:home has occurred.
     let eventData = JSON.stringify({
       engineName: engineName,
       searchTerms: searchTerms
     });
     let event = new CustomEvent("AboutHomeSearchEvent", {detail: eventData});
     document.dispatchEvent(event);
   }
   aEvent.preventDefault();
 }
 function setupSearchEngine()
 {
   // The "autofocus" attribute doesn't focus the form element
   // immediately when the element is first drawn, so the
   // attribute is also used for styling when the page first loads.
   let searchText = document.getElementById("searchText");
   searchText.addEventListener("blur", function searchText_onBlur() {
     searchText.removeEventListener("blur", searchText_onBlur);
     searchText.removeAttribute("autofocus");
   });
   let searchEngineName = document.documentElement.getAttribute("searchEngineName");
   let searchEngineInfo = SEARCH_ENGINES[searchEngineName];
   let logoElt = document.getElementById("searchEngineLogo");
   // Add search engine logo.
   if (searchEngineInfo && searchEngineInfo.image) {
     logoElt.parentNode.hidden = false;
     logoElt.src = searchEngineInfo.image;
     logoElt.alt = searchEngineName;
     searchText.placeholder = "";
   }
   else {
     logoElt.parentNode.hidden = true;
     searchText.placeholder = searchEngineName;
   }
 }
 /**
  * Inform the test harness that we're done loading the page.
  */
 function loadSucceeded()
 {
   var event = new CustomEvent("AboutHomeLoadSnippetsSucceeded", {bubbles:true});
   document.dispatchEvent(event);
 }
 /**
  * Update the local snippets from the remote storage, then show them through
  * showSnippets.
  */
 function loadSnippets()
 {
   if (!gSnippetsMap)
     throw new Error("Snippets map has not properly been initialized");
   // Allow tests to modify the snippets map before using it.
   var event = new CustomEvent("AboutHomeLoadSnippets", {bubbles:true});
   document.dispatchEvent(event);
   // Check cached snippets version.
   let cachedVersion = gSnippetsMap.get("snippets-cached-version") || 0;
   let currentVersion = document.documentElement.getAttribute("snippetsVersion");
   if (cachedVersion < currentVersion) {
     // The cached snippets are old and unsupported, restart from scratch.
     gSnippetsMap.clear();
   }
   // Check last snippets update.
   let lastUpdate = gSnippetsMap.get("snippets-last-update");
   let updateURL = document.documentElement.getAttribute("snippetsURL");
   let shouldUpdate = !lastUpdate ||
                      Date.now() - lastUpdate > SNIPPETS_UPDATE_INTERVAL_MS;
   if (updateURL && shouldUpdate) {
     // Try to update from network.
     let xhr = new XMLHttpRequest();
     try {
       xhr.open("GET", updateURL, true);
     } catch (ex) {
       showSnippets();
       loadSucceeded();
       return;
     }
     // Even if fetching should fail we don't want to spam the server, thus
     // set the last update time regardless its results.  Will retry tomorrow.
     gSnippetsMap.set("snippets-last-update", Date.now());
     xhr.onerror = function (event) {
       showSnippets();
     };
     xhr.onload = function (event)
     {
       if (xhr.status == 200) {
         gSnippetsMap.set("snippets", xhr.responseText);
         gSnippetsMap.set("snippets-cached-version", currentVersion);
       }
       showSnippets();
       loadSucceeded();
     };
     xhr.send(null);
   } else {
     showSnippets();
     loadSucceeded();
   }
 }
 /**
  * Shows locally cached remote snippets, or default ones when not available.
  *
  * @note: snippets should never invoke showSnippets(), or they may cause
  *        a "too much recursion" exception.
  */
 let _snippetsShown = false;
 function showSnippets()
 {
   let snippetsElt = document.getElementById("snippets");
   // Show about:rights notification, if needed.
   let showRights = document.documentElement.getAttribute("showKnowYourRights");
   if (showRights) {
     let rightsElt = document.getElementById("rightsSnippet");
     let anchor = rightsElt.getElementsByTagName("a")[0];
     anchor.href = "about:rights";
     snippetsElt.appendChild(rightsElt);
     rightsElt.removeAttribute("hidden");
     return;
   }
   if (!gSnippetsMap)
     throw new Error("Snippets map has not properly been initialized");
   if (_snippetsShown) {
     // There's something wrong with the remote snippets, just in case fall back
     // to the default snippets.
     showDefaultSnippets();
     throw new Error("showSnippets should never be invoked multiple times");
   }
   _snippetsShown = true;
   let snippets = gSnippetsMap.get("snippets");
   // If there are remotely fetched snippets, try to to show them.
   if (snippets) {
     // Injecting snippets can throw if they're invalid XML.
     try {
       snippetsElt.innerHTML = snippets;
       // Scripts injected by innerHTML are inactive, so we have to relocate them
       // through DOM manipulation to activate their contents.
       Array.forEach(snippetsElt.getElementsByTagName("script"), function(elt) {
         let relocatedScript = document.createElement("script");
         relocatedScript.type = "text/javascript;version=1.8";
         relocatedScript.text = elt.text;
         elt.parentNode.replaceChild(relocatedScript, elt);
       });
       return;
     } catch (ex) {
       // Bad content, continue to show default snippets.
     }
   }
   showDefaultSnippets();
 }
 /**
  * Clear snippets element contents and show default snippets.
  */
 function showDefaultSnippets()
 {
   // Clear eventual contents...
   let snippetsElt = document.getElementById("snippets");
   snippetsElt.innerHTML = "";
   // ...then show default snippets.
   let defaultSnippetsElt = document.getElementById("defaultSnippets");
   let entries = defaultSnippetsElt.querySelectorAll("span");
   // Choose a random snippet.  Assume there is always at least one.
   let randIndex = Math.floor(Math.random() * entries.length);
   let entry = entries[randIndex];
   // Inject url in the eventual link.
   if (DEFAULT_SNIPPETS_URLS[randIndex]) {
     let links = entry.getElementsByTagName("a");
     // Default snippets can have only one link, otherwise something is messed
     // up in the translation.
     if (links.length == 1) {
       links[0].href = DEFAULT_SNIPPETS_URLS[randIndex];
     }
   }
   // Move the default snippet to the snippets element.
   snippetsElt.appendChild(entry);
 }
 function fitToWidth() {
   if (window.scrollMaxX) {
     document.body.setAttribute("narrow", "true");
   } else if (document.body.hasAttribute("narrow")) {
     document.body.removeAttribute("narrow");
     fitToWidth();
   }
 }