gecko-dev/browser/base/content/abouthome/aboutHome.js

/* 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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#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" ]) {
      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 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);
      }
      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();
  }
}