aboutHome.js (23328B) - View raw
/* 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": { // This is the "2x" image designed for OS X retina resolution, Windows at 192dpi, etc.; // it will be scaled down as necessary on lower-dpi displays. image: "data:image/png;base64," + "iVBORw0KGgoAAAANSUhEUgAAAIwAAAA4CAYAAAAvmxBdAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJ" + "bWFnZVJlYWR5ccllPAAAGrFJREFUeNrtfHt4VdW172+utZOASLJ5+BaIFrUeXkFsa0Fl++gDnznV" + "VlvFxt7aqvUUarXtse3Bau35ak/rZ9XT26NtfOvV6wFET+FYCQEKWqsQIT5RCAgSXnlnrzXneNw/" + "1lphJSSQ8BB7bub3zW+LO3uN+fiNMcf4jTEX0N/6W3/rb/2tv30smtnXB3zmRi2FQakxQNKX3WkW" + "9S/tgW3HLpmQM543A0BWVSHMYGIwOTDxzxrOf3/RQQfMZ2/SLAvKhTFVBGUqKFONH2QAzwOMF38a" + "wHhYZAxWAqhe/iszp3+b970d/sInc57vz/J8L2eMB2MAEYkBQ6DQ3dRw4dq7AUjcP3rAfPZmLWXC" + "LHKoIAcQAUxaB5EaEfc6AEBhjDEwmcx43/fO9HxT4vkReBIAAZgjgodW3NcPnn1sHgD/iHknn+0d" + "6s8XEUhsXXac/34WAAGw8afuT8GZ3X055YeSJcIsG+pMZwFn0UihezRofPt3G54f/0E8cNMN+Myo" + 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"H37uhgeG597sdYnIYeeszypQqQawre9dHNbd0Yj9/5KnfsB8DJpuXXj8Q+ryj3dUZglD1Uz3MsWv" + "HX7uh1fv6QGHn7upAmrWQpEV2zSt+bVptamw+6C9VaP/hcoHrvkABgydUjPLywy6Oboh6HW6PgLj" + "LYqStqYRQHKDMQflMhXOQrnata27tvGvufrEn8ZBfmdPP2AO7NpmAAw85B8qTyjKlt1svAHTjPGL" + "k4w0jAcTAyllnBoh9Kxw/tEdS8cuT0WyH4vX1PYD5qMBzQDE2eFDxz09zsscWuwVHX6a8YwaFAiM" + "NAkHr4vdUdf82rQN6JwnSl4N4vAxeKdxP2A+mjXuKTvcXcY9TdOnyxPk4zKZ/vbRAqe75C3QfZZY" + "0P/y6/7299z+H4QrdGsoib8JAAAAAElFTkSuQmCC" } }; // 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 = [ "" ]; 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) { return; 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() { return; 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() { return; 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() { return; // 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(); } }