gecko/browser/base/content/abouthome/aboutHome.js
2013-02-27 18:57:50 +01:00

354 lines
24 KiB
JavaScript

/* 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 = {
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#ifdef XP_MACOSX
, imageHD: 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"
#endif
}
};
// 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 = [
"http://www.mozilla.com/firefox/features/?WT.mc_ID=default1"
, "https://addons.mozilla.org/firefox/?src=snippet&WT.mc_ID=default2"
];
const SNIPPETS_UPDATE_INTERVAL_MS = 86400000; // 1 Day.
let gObserver = new MutationObserver(function (mutations) {
for (let mutation of mutations) {
if (mutation.attributeName == "searchEngineURL") {
gObserver.disconnect();
setupSearchEngine();
ensureSnippetsMapThen(loadSnippets);
return;
}
}
});
window.addEventListener("load", 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);
});
// 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;
}
// TODO (bug 789348): use a real asynchronous storage here. This setTimeout
// is done just to catch bugs with the asynchronous behavior.
setTimeout(function() {
// Populate the cache from the persistent storage.
let cache = new Map();
for (let key of [ "snippets-last-update",
"snippets-cached-version",
"snippets" ]) {
cache.set(key, localStorage[key]);
}
gSnippetsMap = Object.freeze({
get: function (aKey) cache.get(aKey),
set: function (aKey, aValue) {
localStorage[aKey] = aValue;
return cache.set(aKey, aValue);
},
has: function(aKey) cache.has(aKey),
delete: function(aKey) {
delete localStorage[aKey];
return cache.delete(aKey);
},
clear: function() {
localStorage.clear();
return cache.clear();
},
get size() cache.size
});
for (let callback of gSnippetsMapCallbacks) {
callback(gSnippetsMap);
}
gSnippetsMapCallbacks.length = 0;
}, 0);
}
function onSearchSubmit(aEvent)
{
let searchTerms = document.getElementById("searchText").value;
let searchURL = document.documentElement.getAttribute("searchEngineURL");
if (searchURL && searchTerms.length > 0) {
const SEARCH_TOKENS = {
"_searchTerms_": encodeURIComponent(searchTerms)
}
for (let key in SEARCH_TOKENS) {
searchURL = searchURL.replace(key, SEARCH_TOKENS[key]);
}
// Send an event that a search was performed. This was originally
// added so Firefox Health Report could record that a search from
// about:home had occurred.
let engineName = document.documentElement.getAttribute("searchEngineName");
let event = new CustomEvent("AboutHomeSearchEvent", {detail: engineName});
document.dispatchEvent(event);
window.location.href = searchURL;
}
aEvent.preventDefault();
}
function setupSearchEngine()
{
let searchEngineName = document.documentElement.getAttribute("searchEngineName");
let searchEngineInfo = SEARCH_ENGINES[searchEngineName];
if (!searchEngineInfo) {
return;
}
// Add search engine logo.
if (searchEngineInfo.image) {
let logoElt = document.getElementById("searchEngineLogo");
logoElt.src = searchEngineInfo.image;
#ifdef XP_MACOSX
if (searchEngineInfo.imageHD && window.matchMedia("(min-resolution: 2dppx)"))
logoElt.src = searchEngineInfo.imageHD;
#endif
logoElt.alt = searchEngineName;
}
// 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");
});
}
/**
* 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");
// 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();
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();
};
xhr.send(null);
} else {
showSnippets();
}
}
/**
* 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()
{
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 snippetsElt = document.getElementById("snippets");
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();
}
}