The Tor Browser / file comparison

comparison: browser/base/content/abouthome/aboutHome.js

browser/base/content/abouthome/aboutHome.js

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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/. */
4
5 const SEARCH_ENGINES = {
6 "Google": {
7 // This is the "2x" image designed for OS X retina resolution, Windows at 192dpi, etc.;
8 // it will be scaled down as necessary on lower-dpi displays.
9 // This needs to be defined in a single line to keep the JS parser from creating many
10 // intermediate strings in memory. See bug 986672.
11 image: "data:image/png;base64,\
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134 }
135 };
136
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 ];
146
147 const SNIPPETS_UPDATE_INTERVAL_MS = 86400000; // 1 Day.
148
149 // IndexedDB storage constants.
150 const DATABASE_NAME = "abouthome";
151 const DATABASE_VERSION = 1;
152 const SNIPPETS_OBJECTSTORE_NAME = "snippets";
153
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 });
168
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);
175
176 // Ask chrome to update snippets.
177 var event = new CustomEvent("AboutHomeLoad", {bubbles:true});
178 document.dispatchEvent(event);
179 });
180
181 window.addEventListener("pagehide", function() {
182 window.gObserver.disconnect();
183 window.removeEventListener("resize", fitToWidth);
184 });
185
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 = [];
191
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 }
206
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 }
213
214 let invokeCallbacks = function () {
215 if (!gSnippetsMap) {
216 gSnippetsMap = Object.freeze(new Map());
217 }
218
219 for (let callback of gSnippetsMapCallbacks) {
220 callback(gSnippetsMap);
221 }
222 gSnippetsMapCallbacks.length = 0;
223 }
224
225 let openRequest = indexedDB.open(DATABASE_NAME, DATABASE_VERSION);
226
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 };
233
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 }
240
241 openRequest.onsuccess = function (event) {
242 let db = event.target.result;
243
244 db.onerror = function (event) {
245 invokeCallbacks();
246 }
247
248 db.onversionchange = function (event) {
249 event.target.close();
250 invokeCallbacks();
251 }
252
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 }
259
260 cursorRequest.onsuccess = function(event) {
261 let cursor = event.target.result;
262
263 // Populate the cache from the persistent storage.
264 if (cursor) {
265 cache.set(cursor.key, cursor.value);
266 cursor.continue();
267 return;
268 }
269
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 });
291
292 setTimeout(invokeCallbacks, 0);
293 }
294 }
295 }
296
297 function onSearchSubmit(aEvent)
298 {
299 let searchTerms = document.getElementById("searchText").value;
300 let engineName = document.documentElement.getAttribute("searchEngineName");
301
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 }
312
313 aEvent.preventDefault();
314 }
315
316
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 });
327
328 let searchEngineName = document.documentElement.getAttribute("searchEngineName");
329 let searchEngineInfo = SEARCH_ENGINES[searchEngineName];
330 let logoElt = document.getElementById("searchEngineLogo");
331
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 }
343
344 }
345
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 }
354
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");
363
364 // Allow tests to modify the snippets map before using it.
365 var event = new CustomEvent("AboutHomeLoadSnippets", {bubbles:true});
366 document.dispatchEvent(event);
367
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 }
375
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 }
412
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");
423
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 }
434
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;
444
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 }
464
465 showDefaultSnippets();
466 }
467
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 = "";
476
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 }
495
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 }

Mercurial Repository: The Tor Browser

Europalab SCM Repository Server

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