1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/browser/base/content/abouthome/aboutHome.js Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,503 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +const SEARCH_ENGINES = {
1.9 + "Google": {
1.10 + // This is the "2x" image designed for OS X retina resolution, Windows at 192dpi, etc.;
1.11 + // it will be scaled down as necessary on lower-dpi displays.
1.12 + // This needs to be defined in a single line to keep the JS parser from creating many
1.13 + // intermediate strings in memory. See bug 986672.
1.14 + image: "data:image/png;base64,\
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1.137 + }
1.138 +};
1.139 +
1.140 +// The process of adding a new default snippet involves:
1.141 +// * add a new entity to aboutHome.dtd
1.142 +// * add a <span/> for it in aboutHome.xhtml
1.143 +// * add an entry here in the proper ordering (based on spans)
1.144 +// The <a/> part of the snippet will be linked to the corresponding url.
1.145 +const DEFAULT_SNIPPETS_URLS = [
1.146 + "https://www.mozilla.org/firefox/features/?utm_source=snippet&utm_medium=snippet&utm_campaign=default+feature+snippet"
1.147 +, "https://addons.mozilla.org/firefox/?utm_source=snippet&utm_medium=snippet&utm_campaign=addons"
1.148 +];
1.149 +
1.150 +const SNIPPETS_UPDATE_INTERVAL_MS = 86400000; // 1 Day.
1.151 +
1.152 +// IndexedDB storage constants.
1.153 +const DATABASE_NAME = "abouthome";
1.154 +const DATABASE_VERSION = 1;
1.155 +const SNIPPETS_OBJECTSTORE_NAME = "snippets";
1.156 +
1.157 +// This global tracks if the page has been set up before, to prevent double inits
1.158 +let gInitialized = false;
1.159 +let gObserver = new MutationObserver(function (mutations) {
1.160 + for (let mutation of mutations) {
1.161 + if (mutation.attributeName == "searchEngineName") {
1.162 + setupSearchEngine();
1.163 + if (!gInitialized) {
1.164 + ensureSnippetsMapThen(loadSnippets);
1.165 + gInitialized = true;
1.166 + }
1.167 + return;
1.168 + }
1.169 + }
1.170 +});
1.171 +
1.172 +window.addEventListener("pageshow", function () {
1.173 + // Delay search engine setup, cause browser.js::BrowserOnAboutPageLoad runs
1.174 + // later and may use asynchronous getters.
1.175 + window.gObserver.observe(document.documentElement, { attributes: true });
1.176 + fitToWidth();
1.177 + window.addEventListener("resize", fitToWidth);
1.178 +
1.179 + // Ask chrome to update snippets.
1.180 + var event = new CustomEvent("AboutHomeLoad", {bubbles:true});
1.181 + document.dispatchEvent(event);
1.182 +});
1.183 +
1.184 +window.addEventListener("pagehide", function() {
1.185 + window.gObserver.disconnect();
1.186 + window.removeEventListener("resize", fitToWidth);
1.187 +});
1.188 +
1.189 +// This object has the same interface as Map and is used to store and retrieve
1.190 +// the snippets data. It is lazily initialized by ensureSnippetsMapThen(), so
1.191 +// be sure its callback returned before trying to use it.
1.192 +let gSnippetsMap;
1.193 +let gSnippetsMapCallbacks = [];
1.194 +
1.195 +/**
1.196 + * Ensure the snippets map is properly initialized.
1.197 + *
1.198 + * @param aCallback
1.199 + * Invoked once the map has been initialized, gets the map as argument.
1.200 + * @note Snippets should never directly manage the underlying storage, since
1.201 + * it may change inadvertently.
1.202 + */
1.203 +function ensureSnippetsMapThen(aCallback)
1.204 +{
1.205 + if (gSnippetsMap) {
1.206 + aCallback(gSnippetsMap);
1.207 + return;
1.208 + }
1.209 +
1.210 + // Handle multiple requests during the async initialization.
1.211 + gSnippetsMapCallbacks.push(aCallback);
1.212 + if (gSnippetsMapCallbacks.length > 1) {
1.213 + // We are already updating, the callbacks will be invoked when done.
1.214 + return;
1.215 + }
1.216 +
1.217 + let invokeCallbacks = function () {
1.218 + if (!gSnippetsMap) {
1.219 + gSnippetsMap = Object.freeze(new Map());
1.220 + }
1.221 +
1.222 + for (let callback of gSnippetsMapCallbacks) {
1.223 + callback(gSnippetsMap);
1.224 + }
1.225 + gSnippetsMapCallbacks.length = 0;
1.226 + }
1.227 +
1.228 + let openRequest = indexedDB.open(DATABASE_NAME, DATABASE_VERSION);
1.229 +
1.230 + openRequest.onerror = function (event) {
1.231 + // Try to delete the old database so that we can start this process over
1.232 + // next time.
1.233 + indexedDB.deleteDatabase(DATABASE_NAME);
1.234 + invokeCallbacks();
1.235 + };
1.236 +
1.237 + openRequest.onupgradeneeded = function (event) {
1.238 + let db = event.target.result;
1.239 + if (!db.objectStoreNames.contains(SNIPPETS_OBJECTSTORE_NAME)) {
1.240 + db.createObjectStore(SNIPPETS_OBJECTSTORE_NAME);
1.241 + }
1.242 + }
1.243 +
1.244 + openRequest.onsuccess = function (event) {
1.245 + let db = event.target.result;
1.246 +
1.247 + db.onerror = function (event) {
1.248 + invokeCallbacks();
1.249 + }
1.250 +
1.251 + db.onversionchange = function (event) {
1.252 + event.target.close();
1.253 + invokeCallbacks();
1.254 + }
1.255 +
1.256 + let cache = new Map();
1.257 + let cursorRequest = db.transaction(SNIPPETS_OBJECTSTORE_NAME)
1.258 + .objectStore(SNIPPETS_OBJECTSTORE_NAME).openCursor();
1.259 + cursorRequest.onerror = function (event) {
1.260 + invokeCallbacks();
1.261 + }
1.262 +
1.263 + cursorRequest.onsuccess = function(event) {
1.264 + let cursor = event.target.result;
1.265 +
1.266 + // Populate the cache from the persistent storage.
1.267 + if (cursor) {
1.268 + cache.set(cursor.key, cursor.value);
1.269 + cursor.continue();
1.270 + return;
1.271 + }
1.272 +
1.273 + // The cache has been filled up, create the snippets map.
1.274 + gSnippetsMap = Object.freeze({
1.275 + get: function (aKey) cache.get(aKey),
1.276 + set: function (aKey, aValue) {
1.277 + db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")
1.278 + .objectStore(SNIPPETS_OBJECTSTORE_NAME).put(aValue, aKey);
1.279 + return cache.set(aKey, aValue);
1.280 + },
1.281 + has: function (aKey) cache.has(aKey),
1.282 + delete: function (aKey) {
1.283 + db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")
1.284 + .objectStore(SNIPPETS_OBJECTSTORE_NAME).delete(aKey);
1.285 + return cache.delete(aKey);
1.286 + },
1.287 + clear: function () {
1.288 + db.transaction(SNIPPETS_OBJECTSTORE_NAME, "readwrite")
1.289 + .objectStore(SNIPPETS_OBJECTSTORE_NAME).clear();
1.290 + return cache.clear();
1.291 + },
1.292 + get size() cache.size
1.293 + });
1.294 +
1.295 + setTimeout(invokeCallbacks, 0);
1.296 + }
1.297 + }
1.298 +}
1.299 +
1.300 +function onSearchSubmit(aEvent)
1.301 +{
1.302 + let searchTerms = document.getElementById("searchText").value;
1.303 + let engineName = document.documentElement.getAttribute("searchEngineName");
1.304 +
1.305 + if (engineName && searchTerms.length > 0) {
1.306 + // Send an event that will perform a search and Firefox Health Report will
1.307 + // record that a search from about:home has occurred.
1.308 + let eventData = JSON.stringify({
1.309 + engineName: engineName,
1.310 + searchTerms: searchTerms
1.311 + });
1.312 + let event = new CustomEvent("AboutHomeSearchEvent", {detail: eventData});
1.313 + document.dispatchEvent(event);
1.314 + }
1.315 +
1.316 + aEvent.preventDefault();
1.317 +}
1.318 +
1.319 +
1.320 +function setupSearchEngine()
1.321 +{
1.322 + // The "autofocus" attribute doesn't focus the form element
1.323 + // immediately when the element is first drawn, so the
1.324 + // attribute is also used for styling when the page first loads.
1.325 + let searchText = document.getElementById("searchText");
1.326 + searchText.addEventListener("blur", function searchText_onBlur() {
1.327 + searchText.removeEventListener("blur", searchText_onBlur);
1.328 + searchText.removeAttribute("autofocus");
1.329 + });
1.330 +
1.331 + let searchEngineName = document.documentElement.getAttribute("searchEngineName");
1.332 + let searchEngineInfo = SEARCH_ENGINES[searchEngineName];
1.333 + let logoElt = document.getElementById("searchEngineLogo");
1.334 +
1.335 + // Add search engine logo.
1.336 + if (searchEngineInfo && searchEngineInfo.image) {
1.337 + logoElt.parentNode.hidden = false;
1.338 + logoElt.src = searchEngineInfo.image;
1.339 + logoElt.alt = searchEngineName;
1.340 + searchText.placeholder = "";
1.341 + }
1.342 + else {
1.343 + logoElt.parentNode.hidden = true;
1.344 + searchText.placeholder = searchEngineName;
1.345 + }
1.346 +
1.347 +}
1.348 +
1.349 +/**
1.350 + * Inform the test harness that we're done loading the page.
1.351 + */
1.352 +function loadSucceeded()
1.353 +{
1.354 + var event = new CustomEvent("AboutHomeLoadSnippetsSucceeded", {bubbles:true});
1.355 + document.dispatchEvent(event);
1.356 +}
1.357 +
1.358 +/**
1.359 + * Update the local snippets from the remote storage, then show them through
1.360 + * showSnippets.
1.361 + */
1.362 +function loadSnippets()
1.363 +{
1.364 + if (!gSnippetsMap)
1.365 + throw new Error("Snippets map has not properly been initialized");
1.366 +
1.367 + // Allow tests to modify the snippets map before using it.
1.368 + var event = new CustomEvent("AboutHomeLoadSnippets", {bubbles:true});
1.369 + document.dispatchEvent(event);
1.370 +
1.371 + // Check cached snippets version.
1.372 + let cachedVersion = gSnippetsMap.get("snippets-cached-version") || 0;
1.373 + let currentVersion = document.documentElement.getAttribute("snippetsVersion");
1.374 + if (cachedVersion < currentVersion) {
1.375 + // The cached snippets are old and unsupported, restart from scratch.
1.376 + gSnippetsMap.clear();
1.377 + }
1.378 +
1.379 + // Check last snippets update.
1.380 + let lastUpdate = gSnippetsMap.get("snippets-last-update");
1.381 + let updateURL = document.documentElement.getAttribute("snippetsURL");
1.382 + let shouldUpdate = !lastUpdate ||
1.383 + Date.now() - lastUpdate > SNIPPETS_UPDATE_INTERVAL_MS;
1.384 + if (updateURL && shouldUpdate) {
1.385 + // Try to update from network.
1.386 + let xhr = new XMLHttpRequest();
1.387 + try {
1.388 + xhr.open("GET", updateURL, true);
1.389 + } catch (ex) {
1.390 + showSnippets();
1.391 + loadSucceeded();
1.392 + return;
1.393 + }
1.394 + // Even if fetching should fail we don't want to spam the server, thus
1.395 + // set the last update time regardless its results. Will retry tomorrow.
1.396 + gSnippetsMap.set("snippets-last-update", Date.now());
1.397 + xhr.onerror = function (event) {
1.398 + showSnippets();
1.399 + };
1.400 + xhr.onload = function (event)
1.401 + {
1.402 + if (xhr.status == 200) {
1.403 + gSnippetsMap.set("snippets", xhr.responseText);
1.404 + gSnippetsMap.set("snippets-cached-version", currentVersion);
1.405 + }
1.406 + showSnippets();
1.407 + loadSucceeded();
1.408 + };
1.409 + xhr.send(null);
1.410 + } else {
1.411 + showSnippets();
1.412 + loadSucceeded();
1.413 + }
1.414 +}
1.415 +
1.416 +/**
1.417 + * Shows locally cached remote snippets, or default ones when not available.
1.418 + *
1.419 + * @note: snippets should never invoke showSnippets(), or they may cause
1.420 + * a "too much recursion" exception.
1.421 + */
1.422 +let _snippetsShown = false;
1.423 +function showSnippets()
1.424 +{
1.425 + let snippetsElt = document.getElementById("snippets");
1.426 +
1.427 + // Show about:rights notification, if needed.
1.428 + let showRights = document.documentElement.getAttribute("showKnowYourRights");
1.429 + if (showRights) {
1.430 + let rightsElt = document.getElementById("rightsSnippet");
1.431 + let anchor = rightsElt.getElementsByTagName("a")[0];
1.432 + anchor.href = "about:rights";
1.433 + snippetsElt.appendChild(rightsElt);
1.434 + rightsElt.removeAttribute("hidden");
1.435 + return;
1.436 + }
1.437 +
1.438 + if (!gSnippetsMap)
1.439 + throw new Error("Snippets map has not properly been initialized");
1.440 + if (_snippetsShown) {
1.441 + // There's something wrong with the remote snippets, just in case fall back
1.442 + // to the default snippets.
1.443 + showDefaultSnippets();
1.444 + throw new Error("showSnippets should never be invoked multiple times");
1.445 + }
1.446 + _snippetsShown = true;
1.447 +
1.448 + let snippets = gSnippetsMap.get("snippets");
1.449 + // If there are remotely fetched snippets, try to to show them.
1.450 + if (snippets) {
1.451 + // Injecting snippets can throw if they're invalid XML.
1.452 + try {
1.453 + snippetsElt.innerHTML = snippets;
1.454 + // Scripts injected by innerHTML are inactive, so we have to relocate them
1.455 + // through DOM manipulation to activate their contents.
1.456 + Array.forEach(snippetsElt.getElementsByTagName("script"), function(elt) {
1.457 + let relocatedScript = document.createElement("script");
1.458 + relocatedScript.type = "text/javascript;version=1.8";
1.459 + relocatedScript.text = elt.text;
1.460 + elt.parentNode.replaceChild(relocatedScript, elt);
1.461 + });
1.462 + return;
1.463 + } catch (ex) {
1.464 + // Bad content, continue to show default snippets.
1.465 + }
1.466 + }
1.467 +
1.468 + showDefaultSnippets();
1.469 +}
1.470 +
1.471 +/**
1.472 + * Clear snippets element contents and show default snippets.
1.473 + */
1.474 +function showDefaultSnippets()
1.475 +{
1.476 + // Clear eventual contents...
1.477 + let snippetsElt = document.getElementById("snippets");
1.478 + snippetsElt.innerHTML = "";
1.479 +
1.480 + // ...then show default snippets.
1.481 + let defaultSnippetsElt = document.getElementById("defaultSnippets");
1.482 + let entries = defaultSnippetsElt.querySelectorAll("span");
1.483 + // Choose a random snippet. Assume there is always at least one.
1.484 + let randIndex = Math.floor(Math.random() * entries.length);
1.485 + let entry = entries[randIndex];
1.486 + // Inject url in the eventual link.
1.487 + if (DEFAULT_SNIPPETS_URLS[randIndex]) {
1.488 + let links = entry.getElementsByTagName("a");
1.489 + // Default snippets can have only one link, otherwise something is messed
1.490 + // up in the translation.
1.491 + if (links.length == 1) {
1.492 + links[0].href = DEFAULT_SNIPPETS_URLS[randIndex];
1.493 + }
1.494 + }
1.495 + // Move the default snippet to the snippets element.
1.496 + snippetsElt.appendChild(entry);
1.497 +}
1.498 +
1.499 +function fitToWidth() {
1.500 + if (window.scrollMaxX) {
1.501 + document.body.setAttribute("narrow", "true");
1.502 + } else if (document.body.hasAttribute("narrow")) {
1.503 + document.body.removeAttribute("narrow");
1.504 + fitToWidth();
1.505 + }
1.506 +}
