Issue #246 - Revert "Revert "Remove unwanted newtab page code""

Page thumbnails hiccups seem to have resolved, so it can be landed again.

This reverts commit 51792b31a36b9539fdd1b4b85abe486c1652b6c4.

Conflicts:

	application/basilisk/modules/DirectoryLinksProvider.jsm

1 files changed, 0 insertions, 1251 deletions

diff --git a/application/basilisk/modules/DirectoryLinksProvider.jsm b/application/basilisk/modules/DirectoryLinksProvider.jsm
deleted file mode 100644
index 85d8b296b..000000000
--- a/application/basilisk/modules/DirectoryLinksProvider.jsm
+++ /dev/null
@@ -1,1251 +0,0 @@
-/* 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/. */
-
-"use strict";
-
-this.EXPORTED_SYMBOLS = ["DirectoryLinksProvider"];
-
-const Ci = Components.interfaces;
-const Cc = Components.classes;
-const Cu = Components.utils;
-const ParserUtils =  Cc["@mozilla.org/parserutils;1"].getService(Ci.nsIParserUtils);
-
-Cu.importGlobalProperties(["XMLHttpRequest"]);
-
-Cu.import("resource://gre/modules/XPCOMUtils.jsm");
-Cu.import("resource://gre/modules/Services.jsm");
-Cu.import("resource://gre/modules/Task.jsm");
-Cu.import("resource://gre/modules/Timer.jsm");
-
-XPCOMUtils.defineLazyModuleGetter(this, "NetUtil",
-  "resource://gre/modules/NetUtil.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "NewTabUtils",
-  "resource://gre/modules/NewTabUtils.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "OS",
-  "resource://gre/modules/osfile.jsm")
-XPCOMUtils.defineLazyModuleGetter(this, "Promise",
-  "resource://gre/modules/Promise.jsm");
-XPCOMUtils.defineLazyModuleGetter(this, "UpdateUtils",
-  "resource://gre/modules/UpdateUtils.jsm");
-XPCOMUtils.defineLazyServiceGetter(this, "eTLD",
-  "@mozilla.org/network/effective-tld-service;1",
-  "nsIEffectiveTLDService");
-XPCOMUtils.defineLazyGetter(this, "gTextDecoder", () => {
-  return new TextDecoder();
-});
-XPCOMUtils.defineLazyGetter(this, "gCryptoHash", function () {
-  return Cc["@mozilla.org/security/hash;1"].createInstance(Ci.nsICryptoHash);
-});
-XPCOMUtils.defineLazyGetter(this, "gUnicodeConverter", function () {
-  let converter = Cc["@mozilla.org/intl/scriptableunicodeconverter"]
-                    .createInstance(Ci.nsIScriptableUnicodeConverter);
-  converter.charset = 'utf8';
-  return converter;
-});
-
-
-// The filename where directory links are stored locally
-const DIRECTORY_LINKS_FILE = "directoryLinks.json";
-const DIRECTORY_LINKS_TYPE = "application/json";
-
-// The preference that tells whether to match the OS locale
-const PREF_MATCH_OS_LOCALE = "intl.locale.matchOS";
-
-// The preference that tells what locale the user selected
-const PREF_SELECTED_LOCALE = "general.useragent.locale";
-
-// The preference that tells where to obtain directory links
-const PREF_DIRECTORY_SOURCE = "browser.newtabpage.directory.source";
-
-// The preference that tells where to send click/view pings
-const PREF_DIRECTORY_PING = "browser.newtabpage.directory.ping";
-
-// The preference that tells if newtab is enhanced
-const PREF_NEWTAB_ENHANCED = "browser.newtabpage.enhanced";
-
-// Only allow link urls that are http(s)
-const ALLOWED_LINK_SCHEMES = new Set(["http", "https"]);
-
-// Only allow link image urls that are https or data
-const ALLOWED_IMAGE_SCHEMES = new Set(["https", "data"]);
-
-// Only allow urls to Mozilla's CDN or empty (for data URIs)
-const ALLOWED_URL_BASE = new Set(["mozilla.net", ""]);
-
-// The frecency of a directory link
-const DIRECTORY_FRECENCY = 1000;
-
-// The frecency of a suggested link
-const SUGGESTED_FRECENCY = Infinity;
-
-// The filename where frequency cap data stored locally
-const FREQUENCY_CAP_FILE = "frequencyCap.json";
-
-// Default settings for daily and total frequency caps
-const DEFAULT_DAILY_FREQUENCY_CAP = 3;
-const DEFAULT_TOTAL_FREQUENCY_CAP = 10;
-
-// Default timeDelta to prune unused frequency cap objects
-// currently set to 10 days in milliseconds
-const DEFAULT_PRUNE_TIME_DELTA = 10*24*60*60*1000;
-
-// The min number of visible (not blocked) history tiles to have before showing suggested tiles
-const MIN_VISIBLE_HISTORY_TILES = 8;
-
-// The max number of visible (not blocked) history tiles to test for inadjacency
-const MAX_VISIBLE_HISTORY_TILES = 15;
-
-// Allowed ping actions remotely stored as columns: case-insensitive [a-z0-9_]
-const PING_ACTIONS = ["block", "click", "pin", "sponsored", "sponsored_link", "unpin", "view"];
-
-// Location of inadjacent sites json
-const INADJACENCY_SOURCE = "chrome://browser/content/newtab/newTab.inadjacent.json";
-
-// Fake URL to keep track of last block of a suggested tile in the frequency cap object
-const FAKE_SUGGESTED_BLOCK_URL = "ignore://suggested_block";
-
-// Time before suggested tile is allowed to play again after block - default to 1 day
-const AFTER_SUGGESTED_BLOCK_DECAY_TIME = 24*60*60*1000;
-
-/**
- * Singleton that serves as the provider of directory links.
- * Directory links are a hard-coded set of links shown if a user's link
- * inventory is empty.
- */
-var DirectoryLinksProvider = {
-
-  __linksURL: null,
-
-  _observers: new Set(),
-
-  // links download deferred, resolved upon download completion
-  _downloadDeferred: null,
-
-  // download default interval is 24 hours in milliseconds
-  _downloadIntervalMS: 86400000,
-
-  /**
-   * A mapping from eTLD+1 to an enhanced link objects
-   */
-  _enhancedLinks: new Map(),
-
-  /**
-   * A mapping from site to a list of suggested link objects
-   */
-  _suggestedLinks: new Map(),
-
-  /**
-   * Frequency Cap object - maintains daily and total tile counts, and frequency cap settings
-   */
-  _frequencyCaps: {},
-
-  /**
-   * A set of top sites that we can provide suggested links for
-   */
-  _topSitesWithSuggestedLinks: new Set(),
-
-  /**
-   * lookup Set of inadjacent domains
-   */
-  _inadjacentSites: new Set(),
-
-  /**
-   * This flag is set if there is a suggested tile configured to avoid
-   * inadjacent sites in new tab
-   */
-  _avoidInadjacentSites: false,
-
-  /**
-   * This flag is set if _avoidInadjacentSites is true and there is
-   * an inadjacent site in the new tab
-   */
-  _newTabHasInadjacentSite: false,
-
-  get _observedPrefs() {
-    return Object.freeze({
-      enhanced: PREF_NEWTAB_ENHANCED,
-      linksURL: PREF_DIRECTORY_SOURCE,
-      matchOSLocale: PREF_MATCH_OS_LOCALE,
-      prefSelectedLocale: PREF_SELECTED_LOCALE,
-    });
-  },
-
-  get _linksURL() {
-    if (!this.__linksURL) {
-      try {
-        this.__linksURL = Services.prefs.getCharPref(this._observedPrefs["linksURL"]);
-        this.__linksURLModified = Services.prefs.prefHasUserValue(this._observedPrefs["linksURL"]);
-      }
-      catch (e) {
-        Cu.reportError("Error fetching directory links url from prefs: " + e);
-      }
-    }
-    return this.__linksURL;
-  },
-
-  /**
-   * Gets the currently selected locale for display.
-   * @return  the selected locale or "en-US" if none is selected
-   */
-  get locale() {
-    let matchOS = Services.prefs.getBoolPref(PREF_MATCH_OS_LOCALE, false);
-
-    if (matchOS) {
-      return Services.locale.getLocaleComponentForUserAgent();
-    }
-
-    try {
-      let locale = Services.prefs.getComplexValue(PREF_SELECTED_LOCALE,
-                                                  Ci.nsIPrefLocalizedString);
-      if (locale) {
-        return locale.data;
-      }
-    }
-    catch (e) {}
-
-    try {
-      return Services.prefs.getCharPref(PREF_SELECTED_LOCALE);
-    }
-    catch (e) {}
-
-    return "en-US";
-  },
-
-  /**
-   * Set appropriate default ping behavior controlled by enhanced pref
-   */
-  _setDefaultEnhanced: function DirectoryLinksProvider_setDefaultEnhanced() {
-    if (!Services.prefs.prefHasUserValue(PREF_NEWTAB_ENHANCED)) {
-      let enhanced = Services.prefs.getBoolPref(PREF_NEWTAB_ENHANCED);
-      try {
-        // Default to not enhanced if DNT is set to tell websites to not track
-        if (Services.prefs.getBoolPref("privacy.donottrackheader.enabled")) {
-          enhanced = false;
-        }
-      }
-      catch (ex) {}
-      Services.prefs.setBoolPref(PREF_NEWTAB_ENHANCED, enhanced);
-    }
-  },
-
-  observe: function DirectoryLinksProvider_observe(aSubject, aTopic, aData) {
-    if (aTopic == "nsPref:changed") {
-      switch (aData) {
-        // Re-set the default in case the user clears the pref
-        case this._observedPrefs.enhanced:
-          this._setDefaultEnhanced();
-          break;
-
-        case this._observedPrefs.linksURL:
-          delete this.__linksURL;
-          // fallthrough
-
-        // Force directory download on changes to fetch related prefs
-        case this._observedPrefs.matchOSLocale:
-        case this._observedPrefs.prefSelectedLocale:
-          this._fetchAndCacheLinksIfNecessary(true);
-          break;
-      }
-    }
-  },
-
-  _addPrefsObserver: function DirectoryLinksProvider_addObserver() {
-    for (let pref in this._observedPrefs) {
-      let prefName = this._observedPrefs[pref];
-      Services.prefs.addObserver(prefName, this, false);
-    }
-  },
-
-  _removePrefsObserver: function DirectoryLinksProvider_removeObserver() {
-    for (let pref in this._observedPrefs) {
-      let prefName = this._observedPrefs[pref];
-      Services.prefs.removeObserver(prefName, this);
-    }
-  },
-
-  _cacheSuggestedLinks: function(link) {
-    // Don't cache links that don't have the expected 'frecent_sites'
-    if (!link.frecent_sites) {
-      return;
-    }
-
-    for (let suggestedSite of link.frecent_sites) {
-      let suggestedMap = this._suggestedLinks.get(suggestedSite) || new Map();
-      suggestedMap.set(link.url, link);
-      this._setupStartEndTime(link);
-      this._suggestedLinks.set(suggestedSite, suggestedMap);
-    }
-  },
-
-  _fetchAndCacheLinks: function DirectoryLinksProvider_fetchAndCacheLinks(uri) {
-    // Replace with the same display locale used for selecting links data
-    uri = uri.replace("%LOCALE%", this.locale);
-    uri = uri.replace("%CHANNEL%", UpdateUtils.UpdateChannel);
-
-    return this._downloadJsonData(uri).then(json => {
-      return OS.File.writeAtomic(this._directoryFilePath, json, {tmpPath: this._directoryFilePath + ".tmp"});
-    });
-  },
-
-  /**
-   * Downloads a links with json content
-   * @param download uri
-   * @return promise resolved to json string, "{}" returned if status != 200
-   */
-  _downloadJsonData: function DirectoryLinksProvider__downloadJsonData(uri) {
-    let deferred = Promise.defer();
-    let xmlHttp = this._newXHR();
-
-    xmlHttp.onload = function(aResponse) {
-      let json = this.responseText;
-      if (this.status && this.status != 200) {
-        json = "{}";
-      }
-      deferred.resolve(json);
-    };
-
-    xmlHttp.onerror = function(e) {
-      deferred.reject("Fetching " + uri + " results in error code: " + e.target.status);
-    };
-
-    try {
-      xmlHttp.open("GET", uri);
-      // Override the type so XHR doesn't complain about not well-formed XML
-      xmlHttp.overrideMimeType(DIRECTORY_LINKS_TYPE);
-      // Set the appropriate request type for servers that require correct types
-      xmlHttp.setRequestHeader("Content-Type", DIRECTORY_LINKS_TYPE);
-      xmlHttp.send();
-    } catch (e) {
-      deferred.reject("Error fetching " + uri);
-      Cu.reportError(e);
-    }
-    return deferred.promise;
-  },
-
-  /**
-   * Downloads directory links if needed
-   * @return promise resolved immediately if no download needed, or upon completion
-   */
-  _fetchAndCacheLinksIfNecessary: function DirectoryLinksProvider_fetchAndCacheLinksIfNecessary(forceDownload=false) {
-    if (this._downloadDeferred) {
-      // fetching links already - just return the promise
-      return this._downloadDeferred.promise;
-    }
-
-    if (forceDownload || this._needsDownload) {
-      this._downloadDeferred = Promise.defer();
-      this._fetchAndCacheLinks(this._linksURL).then(() => {
-        // the new file was successfully downloaded and cached, so update a timestamp
-        this._lastDownloadMS = Date.now();
-        this._downloadDeferred.resolve();
-        this._downloadDeferred = null;
-        this._callObservers("onManyLinksChanged")
-      },
-      error => {
-        this._downloadDeferred.resolve();
-        this._downloadDeferred = null;
-        this._callObservers("onDownloadFail");
-      });
-      return this._downloadDeferred.promise;
-    }
-
-    // download is not needed
-    return Promise.resolve();
-  },
-
-  /**
-   * @return true if download is needed, false otherwise
-   */
-  get _needsDownload () {
-    // fail if last download occured less then 24 hours ago
-    if ((Date.now() - this._lastDownloadMS) > this._downloadIntervalMS) {
-      return true;
-    }
-    return false;
-  },
-
-  /**
-   * Create a new XMLHttpRequest that is anonymous, i.e., doesn't send cookies
-   */
-  _newXHR() {
-    return new XMLHttpRequest({mozAnon: true});
-  },
-
-  /**
-   * Reads directory links file and parses its content
-   * @return a promise resolved to an object with keys 'directory' and 'suggested',
-   *         each containing a valid list of links,
-   *         or {'directory': [], 'suggested': []} if read or parse fails.
-   */
-  _readDirectoryLinksFile: function DirectoryLinksProvider_readDirectoryLinksFile() {
-    let emptyOutput = {directory: [], suggested: [], enhanced: []};
-    return OS.File.read(this._directoryFilePath).then(binaryData => {
-      let output;
-      try {
-        let json = gTextDecoder.decode(binaryData);
-        let linksObj = JSON.parse(json);
-        output = {directory: linksObj.directory || [],
-                  suggested: linksObj.suggested || [],
-                  enhanced:  linksObj.enhanced  || []};
-      }
-      catch (e) {
-        Cu.reportError(e);
-      }
-      return output || emptyOutput;
-    },
-    error => {
-      Cu.reportError(error);
-      return emptyOutput;
-    });
-  },
-
-  /**
-   * Translates link.time_limits to UTC miliseconds and sets
-   * link.startTime and link.endTime properties in link object
-   */
-  _setupStartEndTime: function DirectoryLinksProvider_setupStartEndTime(link) {
-    // set start/end limits. Use ISO_8601 format: '2014-01-10T20:20:20.600Z'
-    // (details here http://en.wikipedia.org/wiki/ISO_8601)
-    // Note that if timezone is missing, FX will interpret as local time
-    // meaning that the server can sepecify any time, but if the capmaign
-    // needs to start at same time across multiple timezones, the server
-    // omits timezone indicator
-    if (!link.time_limits) {
-      return;
-    }
-
-    let parsedTime;
-    if (link.time_limits.start) {
-      parsedTime = Date.parse(link.time_limits.start);
-      if (parsedTime && !isNaN(parsedTime)) {
-        link.startTime = parsedTime;
-      }
-    }
-    if (link.time_limits.end) {
-      parsedTime = Date.parse(link.time_limits.end);
-      if (parsedTime && !isNaN(parsedTime)) {
-        link.endTime = parsedTime;
-      }
-    }
-  },
-
-  /*
-   * Handles campaign timeout
-   */
-  _onCampaignTimeout: function DirectoryLinksProvider_onCampaignTimeout() {
-    // _campaignTimeoutID is invalid here, so just set it to null
-    this._campaignTimeoutID = null;
-    this._updateSuggestedTile();
-  },
-
-  /*
-   * Clears capmpaign timeout
-   */
-  _clearCampaignTimeout: function DirectoryLinksProvider_clearCampaignTimeout() {
-    if (this._campaignTimeoutID) {
-      clearTimeout(this._campaignTimeoutID);
-      this._campaignTimeoutID = null;
-    }
-  },
-
-  /**
-   * Setup capmpaign timeout to recompute suggested tiles upon
-   * reaching soonest start or end time for the campaign
-   * @param timeout in milliseconds
-   */
-  _setupCampaignTimeCheck: function DirectoryLinksProvider_setupCampaignTimeCheck(timeout) {
-    // sanity check
-    if (!timeout || timeout <= 0) {
-      return;
-    }
-    this._clearCampaignTimeout();
-    // setup next timeout
-    this._campaignTimeoutID = setTimeout(this._onCampaignTimeout.bind(this), timeout);
-  },
-
-  /**
-   * Test link for campaign time limits: checks if link falls within start/end time
-   * and returns an object containing a use flag and the timeoutDate milliseconds
-   * when the link has to be re-checked for campaign start-ready or end-reach
-   * @param link
-   * @return object {use: true or false, timeoutDate: milliseconds or null}
-   */
-  _testLinkForCampaignTimeLimits: function DirectoryLinksProvider_testLinkForCampaignTimeLimits(link) {
-    let currentTime = Date.now();
-    // test for start time first
-    if (link.startTime && link.startTime > currentTime) {
-      // not yet ready for start
-      return {use: false, timeoutDate: link.startTime};
-    }
-    // otherwise check for end time
-    if (link.endTime) {
-      // passed end time
-      if (link.endTime <= currentTime) {
-        return {use: false};
-      }
-      // otherwise link is still ok, but we need to set timeoutDate
-      return {use: true, timeoutDate: link.endTime};
-    }
-    // if we are here, the link is ok and no timeoutDate needed
-    return {use: true};
-  },
-
-  /**
-   * Handles block on suggested tile: updates fake block url with current timestamp
-   */
-  handleSuggestedTileBlock: function DirectoryLinksProvider_handleSuggestedTileBlock() {
-    this._updateFrequencyCapSettings({url: FAKE_SUGGESTED_BLOCK_URL});
-    this._writeFrequencyCapFile();
-    this._updateSuggestedTile();
-  },
-
-  /**
-   * Checks if suggested tile is being blocked for the rest of "decay time"
-   * @return True if blocked, false otherwise
-   */
-  _isSuggestedTileBlocked: function DirectoryLinksProvider__isSuggestedTileBlocked() {
-    let capObject = this._frequencyCaps[FAKE_SUGGESTED_BLOCK_URL];
-    if (!capObject || !capObject.lastUpdated) {
-      // user never blocked suggested tile or lastUpdated is missing
-      return false;
-    }
-    // otherwise, make sure that enough time passed after suggested tile was blocked
-    return (capObject.lastUpdated + AFTER_SUGGESTED_BLOCK_DECAY_TIME) > Date.now();
-  },
-
-  /**
-   * Report some action on a newtab page (view, click)
-   * @param sites Array of sites shown on newtab page
-   * @param action String of the behavior to report
-   * @param triggeringSiteIndex optional Int index of the site triggering action
-   * @return download promise
-   */
-  reportSitesAction: function DirectoryLinksProvider_reportSitesAction(sites, action, triggeringSiteIndex) {
-    // Check if the suggested tile was shown
-    if (action == "view") {
-      sites.slice(0, triggeringSiteIndex + 1).filter(s => s).forEach(site => {
-        let {targetedSite, url} = site.link;
-        if (targetedSite) {
-          this._addFrequencyCapView(url);
-        }
-      });
-    }
-    // any click action on a suggested tile should stop that tile suggestion
-    // click/block - user either removed a tile or went to a landing page
-    // pin - tile turned into history tile, should no longer be suggested
-    // unpin - the tile was pinned before, should not matter
-    else {
-      // suggested tile has targetedSite, or frecent_sites if it was pinned
-      let {frecent_sites, targetedSite, url} = sites[triggeringSiteIndex].link;
-      if (frecent_sites || targetedSite) {
-        this._setFrequencyCapClick(url);
-      }
-    }
-
-    let newtabEnhanced = false;
-    let pingEndPoint = "";
-    try {
-      newtabEnhanced = Services.prefs.getBoolPref(PREF_NEWTAB_ENHANCED);
-      pingEndPoint = Services.prefs.getCharPref(PREF_DIRECTORY_PING);
-    }
-    catch (ex) {}
-
-    // Bug 1240245 - We no longer send pings, but frequency capping and fetching
-    // tests depend on the following actions, so references to PING remain.
-    let invalidAction = PING_ACTIONS.indexOf(action) == -1;
-    if (!newtabEnhanced || pingEndPoint == "" || invalidAction) {
-      return Promise.resolve();
-    }
-
-    return Task.spawn(function* () {
-      // since we updated views/clicks we need write _frequencyCaps to disk
-      yield this._writeFrequencyCapFile();
-      // Use this as an opportunity to potentially fetch new links
-      yield this._fetchAndCacheLinksIfNecessary();
-    }.bind(this));
-  },
-
-  /**
-   * Get the enhanced link object for a link (whether history or directory)
-   */
-  getEnhancedLink: function DirectoryLinksProvider_getEnhancedLink(link) {
-    // Use the provided link if it's already enhanced
-    return link.enhancedImageURI && link ? link :
-           this._enhancedLinks.get(NewTabUtils.extractSite(link.url));
-  },
-
-  /**
-   * Check if a url's scheme is in a Set of allowed schemes and if the base
-   * domain is allowed.
-   * @param url to check
-   * @param allowed Set of allowed schemes
-   * @param checkBase boolean to check the base domain
-   */
-  isURLAllowed(url, allowed, checkBase) {
-    // Assume no url is an allowed url
-    if (!url) {
-      return true;
-    }
-
-    let scheme = "", base = "";
-    try {
-      // A malformed url will not be allowed
-      let uri = Services.io.newURI(url, null, null);
-      scheme = uri.scheme;
-
-      // URIs without base domains will be allowed
-      base = Services.eTLD.getBaseDomain(uri);
-    }
-    catch (ex) {}
-    // Require a scheme match and the base only if desired
-    return allowed.has(scheme) && (!checkBase || ALLOWED_URL_BASE.has(base));
-  },
-
-  _escapeChars(text) {
-    let charMap = {
-      '&': '&amp;',
-      '<': '&lt;',
-      '>': '&gt;',
-      '"': '&quot;',
-      "'": '&#039;'
-    };
-
-    return text.replace(/[&<>"']/g, (character) => charMap[character]);
-  },
-
-  /**
-   * Gets the current set of directory links.
-   * @param aCallback The function that the array of links is passed to.
-   */
-  getLinks: function DirectoryLinksProvider_getLinks(aCallback) {
-    this._readDirectoryLinksFile().then(rawLinks => {
-      // Reset the cache of suggested tiles and enhanced images for this new set of links
-      this._enhancedLinks.clear();
-      this._suggestedLinks.clear();
-      this._clearCampaignTimeout();
-      this._avoidInadjacentSites = false;
-
-      // Only check base domain for images when using the default pref
-      let checkBase = !this.__linksURLModified;
-      let validityFilter = function(link) {
-        // Make sure the link url is allowed and images too if they exist
-        return this.isURLAllowed(link.url, ALLOWED_LINK_SCHEMES, false) &&
-               (!link.imageURI ||
-                this.isURLAllowed(link.imageURI, ALLOWED_IMAGE_SCHEMES, checkBase)) &&
-               (!link.enhancedImageURI ||
-                this.isURLAllowed(link.enhancedImageURI, ALLOWED_IMAGE_SCHEMES, checkBase));
-      }.bind(this);
-
-      rawLinks.suggested.filter(validityFilter).forEach((link, position) => {
-        // Suggested sites must have an adgroup name.
-        if (!link.adgroup_name) {
-          return;
-        }
-
-        let sanitizeFlags = ParserUtils.SanitizerCidEmbedsOnly |
-          ParserUtils.SanitizerDropForms |
-          ParserUtils.SanitizerDropNonCSSPresentation;
-
-        link.explanation = this._escapeChars(link.explanation ? ParserUtils.convertToPlainText(link.explanation, sanitizeFlags, 0) : "");
-        link.targetedName = this._escapeChars(ParserUtils.convertToPlainText(link.adgroup_name, sanitizeFlags, 0));
-        link.lastVisitDate = rawLinks.suggested.length - position;
-        // check if link wants to avoid inadjacent sites
-        if (link.check_inadjacency) {
-          this._avoidInadjacentSites = true;
-        }
-
-        // We cache suggested tiles here but do not push any of them in the links list yet.
-        // The decision for which suggested tile to include will be made separately.
-        this._cacheSuggestedLinks(link);
-        this._updateFrequencyCapSettings(link);
-      });
-
-      rawLinks.enhanced.filter(validityFilter).forEach((link, position) => {
-        link.lastVisitDate = rawLinks.enhanced.length - position;
-
-        // Stash the enhanced image for the site
-        if (link.enhancedImageURI) {
-          this._enhancedLinks.set(NewTabUtils.extractSite(link.url), link);
-        }
-      });
-
-      let links = rawLinks.directory.filter(validityFilter).map((link, position) => {
-        link.lastVisitDate = rawLinks.directory.length - position;
-        link.frecency = DIRECTORY_FRECENCY;
-        return link;
-      });
-
-      // Allow for one link suggestion on top of the default directory links
-      this.maxNumLinks = links.length + 1;
-
-      // prune frequency caps of outdated urls
-      this._pruneFrequencyCapUrls();
-      // write frequency caps object to disk asynchronously
-      this._writeFrequencyCapFile();
-
-      return links;
-    }).catch(ex => {
-      Cu.reportError(ex);
-      return [];
-    }).then(links => {
-      aCallback(links);
-      this._populatePlacesLinks();
-    });
-  },
-
-  init: function DirectoryLinksProvider_init() {
-    this._setDefaultEnhanced();
-    this._addPrefsObserver();
-    // setup directory file path and last download timestamp
-    this._directoryFilePath = OS.Path.join(OS.Constants.Path.localProfileDir, DIRECTORY_LINKS_FILE);
-    this._lastDownloadMS = 0;
-
-    // setup frequency cap file path
-    this._frequencyCapFilePath = OS.Path.join(OS.Constants.Path.localProfileDir, FREQUENCY_CAP_FILE);
-    // setup inadjacent sites URL
-    this._inadjacentSitesUrl = INADJACENCY_SOURCE;
-
-    NewTabUtils.placesProvider.addObserver(this);
-    NewTabUtils.links.addObserver(this);
-
-    return Task.spawn(function*() {
-      // get the last modified time of the links file if it exists
-      let doesFileExists = yield OS.File.exists(this._directoryFilePath);
-      if (doesFileExists) {
-        let fileInfo = yield OS.File.stat(this._directoryFilePath);
-        this._lastDownloadMS = Date.parse(fileInfo.lastModificationDate);
-      }
-      // read frequency cap file
-      yield this._readFrequencyCapFile();
-      // fetch directory on startup without force
-      yield this._fetchAndCacheLinksIfNecessary();
-      // fecth inadjacent sites on startup
-      yield this._loadInadjacentSites();
-    }.bind(this));
-  },
-
-  _handleManyLinksChanged: function() {
-    this._topSitesWithSuggestedLinks.clear();
-    this._suggestedLinks.forEach((suggestedLinks, site) => {
-      if (NewTabUtils.isTopPlacesSite(site)) {
-        this._topSitesWithSuggestedLinks.add(site);
-      }
-    });
-    this._updateSuggestedTile();
-  },
-
-  /**
-   * Updates _topSitesWithSuggestedLinks based on the link that was changed.
-   *
-   * @return true if _topSitesWithSuggestedLinks was modified, false otherwise.
-   */
-  _handleLinkChanged: function(aLink) {
-    let changedLinkSite = NewTabUtils.extractSite(aLink.url);
-    let linkStored = this._topSitesWithSuggestedLinks.has(changedLinkSite);
-
-    if (!NewTabUtils.isTopPlacesSite(changedLinkSite) && linkStored) {
-      this._topSitesWithSuggestedLinks.delete(changedLinkSite);
-      return true;
-    }
-
-    if (this._suggestedLinks.has(changedLinkSite) &&
-        NewTabUtils.isTopPlacesSite(changedLinkSite) && !linkStored) {
-      this._topSitesWithSuggestedLinks.add(changedLinkSite);
-      return true;
-    }
-
-    // always run _updateSuggestedTile if aLink is inadjacent
-    // and there are tiles configured to avoid it
-    if (this._avoidInadjacentSites && this._isInadjacentLink(aLink)) {
-      return true;
-    }
-
-    return false;
-  },
-
-  _populatePlacesLinks: function () {
-    NewTabUtils.links.populateProviderCache(NewTabUtils.placesProvider, () => {
-      this._handleManyLinksChanged();
-    });
-  },
-
-  onDeleteURI: function(aProvider, aLink) {
-    let {url} = aLink;
-    // remove clicked flag for that url and
-    // call observer upon disk write completion
-    this._removeTileClick(url).then(() => {
-      this._callObservers("onDeleteURI", url);
-    });
-  },
-
-  onClearHistory: function() {
-    // remove all clicked flags and call observers upon file write
-    this._removeAllTileClicks().then(() => {
-      this._callObservers("onClearHistory");
-    });
-  },
-
-  onLinkChanged: function (aProvider, aLink) {
-    // Make sure NewTabUtils.links handles the notification first.
-    setTimeout(() => {
-      if (this._handleLinkChanged(aLink) || this._shouldUpdateSuggestedTile()) {
-        this._updateSuggestedTile();
-      }
-    }, 0);
-  },
-
-  onManyLinksChanged: function () {
-    // Make sure NewTabUtils.links handles the notification first.
-    setTimeout(() => {
-      this._handleManyLinksChanged();
-    }, 0);
-  },
-
-  _getCurrentTopSiteCount: function() {
-    let visibleTopSiteCount = 0;
-    let newTabLinks = NewTabUtils.links.getLinks();
-    for (let link of newTabLinks.slice(0, MIN_VISIBLE_HISTORY_TILES)) {
-      // compute visibleTopSiteCount for suggested tiles
-      if (link && (link.type == "history" || link.type == "enhanced")) {
-        visibleTopSiteCount++;
-      }
-    }
-    // since newTabLinks are available, set _newTabHasInadjacentSite here
-    // note that _shouldUpdateSuggestedTile is called by _updateSuggestedTile
-    this._newTabHasInadjacentSite = this._avoidInadjacentSites && this._checkForInadjacentSites(newTabLinks);
-
-    return visibleTopSiteCount;
-  },
-
-  _shouldUpdateSuggestedTile: function() {
-    let sortedLinks = NewTabUtils.getProviderLinks(this);
-
-    let mostFrecentLink = {};
-    if (sortedLinks && sortedLinks.length) {
-      mostFrecentLink = sortedLinks[0]
-    }
-
-    let currTopSiteCount = this._getCurrentTopSiteCount();
-    if ((!mostFrecentLink.targetedSite && currTopSiteCount >= MIN_VISIBLE_HISTORY_TILES) ||
-        (mostFrecentLink.targetedSite && currTopSiteCount < MIN_VISIBLE_HISTORY_TILES)) {
-      // If mostFrecentLink has a targetedSite then mostFrecentLink is a suggested link.
-      // If we have enough history links (8+) to show a suggested tile and we are not
-      // already showing one, then we should update (to *attempt* to add a suggested tile).
-      // OR if we don't have enough history to show a suggested tile (<8) and we are
-      // currently showing one, we should update (to remove it).
-      return true;
-    }
-
-    return false;
-  },
-
-  /**
-   * Chooses and returns a suggested tile based on a user's top sites
-   * that we have an available suggested tile for.
-   *
-   * @return the chosen suggested tile, or undefined if there isn't one
-   */
-  _updateSuggestedTile: function() {
-    let sortedLinks = NewTabUtils.getProviderLinks(this);
-
-    if (!sortedLinks) {
-      // If NewTabUtils.links.resetCache() is called before getting here,
-      // sortedLinks may be undefined.
-      return undefined;
-    }
-
-    // Delete the current suggested tile, if one exists.
-    let initialLength = sortedLinks.length;
-    if (initialLength) {
-      let mostFrecentLink = sortedLinks[0];
-      if (mostFrecentLink.targetedSite) {
-        this._callObservers("onLinkChanged", {
-          url: mostFrecentLink.url,
-          frecency: SUGGESTED_FRECENCY,
-          lastVisitDate: mostFrecentLink.lastVisitDate,
-          type: mostFrecentLink.type,
-        }, 0, true);
-      }
-    }
-
-    if (this._topSitesWithSuggestedLinks.size == 0 ||
-        !this._shouldUpdateSuggestedTile() ||
-        this._isSuggestedTileBlocked()) {
-      // There are no potential suggested links we can show or not
-      // enough history for a suggested tile, or suggested tile was
-      // recently blocked and wait time interval has not decayed yet
-      return undefined;
-    }
-
-    // Create a flat list of all possible links we can show as suggested.
-    // Note that many top sites may map to the same suggested links, but we only
-    // want to count each suggested link once (based on url), thus possibleLinks is a map
-    // from url to suggestedLink. Thus, each link has an equal chance of being chosen at
-    // random from flattenedLinks if it appears only once.
-    let nextTimeout;
-    let possibleLinks = new Map();
-    let targetedSites = new Map();
-    this._topSitesWithSuggestedLinks.forEach(topSiteWithSuggestedLink => {
-      let suggestedLinksMap = this._suggestedLinks.get(topSiteWithSuggestedLink);
-      suggestedLinksMap.forEach((suggestedLink, url) => {
-        // Skip this link if we've shown it too many times already
-        if (!this._testFrequencyCapLimits(url)) {
-          return;
-        }
-
-        // as we iterate suggestedLinks, check for campaign start/end
-        // time limits, and set nextTimeout to the closest timestamp
-        let {use, timeoutDate} = this._testLinkForCampaignTimeLimits(suggestedLink);
-        // update nextTimeout is necessary
-        if (timeoutDate && (!nextTimeout || nextTimeout > timeoutDate)) {
-          nextTimeout = timeoutDate;
-        }
-        // Skip link if it falls outside campaign time limits
-        if (!use) {
-          return;
-        }
-
-        // Skip link if it avoids inadjacent sites and newtab has one
-        if (suggestedLink.check_inadjacency && this._newTabHasInadjacentSite) {
-          return;
-        }
-
-        possibleLinks.set(url, suggestedLink);
-
-        // Keep a map of URL to targeted sites. We later use this to show the user
-        // what site they visited to trigger this suggestion.
-        if (!targetedSites.get(url)) {
-          targetedSites.set(url, []);
-        }
-        targetedSites.get(url).push(topSiteWithSuggestedLink);
-      })
-    });
-
-    // setup timeout check for starting or ending campaigns
-    if (nextTimeout) {
-      this._setupCampaignTimeCheck(nextTimeout - Date.now());
-    }
-
-    // We might have run out of possible links to show
-    let numLinks = possibleLinks.size;
-    if (numLinks == 0) {
-      return undefined;
-    }
-
-    let flattenedLinks = [...possibleLinks.values()];
-
-    // Choose our suggested link at random
-    let suggestedIndex = Math.floor(Math.random() * numLinks);
-    let chosenSuggestedLink = flattenedLinks[suggestedIndex];
-
-    // Add the suggested link to the front with some extra values
-    this._callObservers("onLinkChanged", Object.assign({
-      frecency: SUGGESTED_FRECENCY,
-
-      // Choose the first site a user has visited as the target. In the future,
-      // this should be the site with the highest frecency. However, we currently
-      // store frecency by URL not by site.
-      targetedSite: targetedSites.get(chosenSuggestedLink.url).length ?
-        targetedSites.get(chosenSuggestedLink.url)[0] : null
-    }, chosenSuggestedLink));
-    return chosenSuggestedLink;
-   },
-
-  /**
-   * Loads inadjacent sites
-   * @return a promise resolved when lookup Set for sites is built
-   */
-  _loadInadjacentSites: function DirectoryLinksProvider_loadInadjacentSites() {
-    return this._downloadJsonData(this._inadjacentSitesUrl).then(jsonString => {
-      let jsonObject = {};
-      try {
-        jsonObject = JSON.parse(jsonString);
-      }
-      catch (e) {
-        Cu.reportError(e);
-      }
-
-      this._inadjacentSites = new Set(jsonObject.domains);
-    });
-  },
-
-  /**
-   * Genegrates hash suitable for looking up inadjacent site
-   * @param value to hsh
-   * @return hased value, base64-ed
-   */
-  _generateHash: function DirectoryLinksProvider_generateHash(value) {
-    let byteArr = gUnicodeConverter.convertToByteArray(value);
-    gCryptoHash.init(gCryptoHash.MD5);
-    gCryptoHash.update(byteArr, byteArr.length);
-    return gCryptoHash.finish(true);
-  },
-
-  /**
-   * Checks if link belongs to inadjacent domain
-   * @param link to check
-   * @return true for inadjacent domains, false otherwise
-   */
-  _isInadjacentLink: function DirectoryLinksProvider_isInadjacentLink(link) {
-    let baseDomain = link.baseDomain || NewTabUtils.extractSite(link.url || "");
-    if (!baseDomain) {
-        return false;
-    }
-    // check if hashed domain is inadjacent
-    return this._inadjacentSites.has(this._generateHash(baseDomain));
-  },
-
-  /**
-   * Checks if new tab has inadjacent site
-   * @param new tab links (or nothing, in which case NewTabUtils.links.getLinks() is called
-   * @return true if new tab shows has inadjacent site
-   */
-  _checkForInadjacentSites: function DirectoryLinksProvider_checkForInadjacentSites(newTabLink) {
-    let links = newTabLink || NewTabUtils.links.getLinks();
-    for (let link of links.slice(0, MAX_VISIBLE_HISTORY_TILES)) {
-      // check links against inadjacent list - specifically include ALL link types
-      if (this._isInadjacentLink(link)) {
-        return true;
-      }
-    }
-    return false;
-  },
-
-  /**
-   * Reads json file, parses its content, and returns resulting object
-   * @param json file path
-   * @param json object to return in case file read or parse fails
-   * @return a promise resolved to a valid object or undefined upon error
-   */
-  _readJsonFile: Task.async(function* (filePath, nullObject) {
-    let jsonObj;
-    try {
-      let binaryData = yield OS.File.read(filePath);
-      let json = gTextDecoder.decode(binaryData);
-      jsonObj = JSON.parse(json);
-    }
-    catch (e) {}
-    return jsonObj || nullObject;
-  }),
-
-  /**
-   * Loads frequency cap object from file and parses its content
-   * @return a promise resolved upon load completion
-   *         on error or non-exstent file _frequencyCaps is set to empty object
-   */
-  _readFrequencyCapFile: Task.async(function* () {
-    // set _frequencyCaps object to file's content or empty object
-    this._frequencyCaps = yield this._readJsonFile(this._frequencyCapFilePath, {});
-  }),
-
-  /**
-   * Saves frequency cap object to file
-   * @return a promise resolved upon file i/o completion
-   */
-  _writeFrequencyCapFile: function DirectoryLinksProvider_writeFrequencyCapFile() {
-    let json = JSON.stringify(this._frequencyCaps || {});
-    return OS.File.writeAtomic(this._frequencyCapFilePath, json, {tmpPath: this._frequencyCapFilePath + ".tmp"});
-  },
-
-  /**
-   * Clears frequency cap object and writes empty json to file
-   * @return a promise resolved upon file i/o completion
-   */
-  _clearFrequencyCap: function DirectoryLinksProvider_clearFrequencyCap() {
-    this._frequencyCaps = {};
-    return this._writeFrequencyCapFile();
-  },
-
-  /**
-   * updates frequency cap configuration for a link
-   */
-  _updateFrequencyCapSettings: function DirectoryLinksProvider_updateFrequencyCapSettings(link) {
-    let capsObject = this._frequencyCaps[link.url];
-    if (!capsObject) {
-      // create an object with empty counts
-      capsObject = {
-        dailyViews: 0,
-        totalViews: 0,
-        lastShownDate: 0,
-      };
-      this._frequencyCaps[link.url] = capsObject;
-    }
-    // set last updated timestamp
-    capsObject.lastUpdated = Date.now();
-    // check for link configuration
-    if (link.frequency_caps) {
-      capsObject.dailyCap = link.frequency_caps.daily || DEFAULT_DAILY_FREQUENCY_CAP;
-      capsObject.totalCap = link.frequency_caps.total || DEFAULT_TOTAL_FREQUENCY_CAP;
-    }
-    else {
-      // fallback to defaults
-      capsObject.dailyCap = DEFAULT_DAILY_FREQUENCY_CAP;
-      capsObject.totalCap = DEFAULT_TOTAL_FREQUENCY_CAP;
-    }
-  },
-
-  /**
-   * Prunes frequency cap objects for outdated links
-   * @param timeDetla milliseconds
-   *        all cap objects with lastUpdated less than (now() - timeDelta)
-   *        will be removed. This is done to remove frequency cap objects
-   *        for unused tile urls
-   */
-  _pruneFrequencyCapUrls: function DirectoryLinksProvider_pruneFrequencyCapUrls(timeDelta = DEFAULT_PRUNE_TIME_DELTA) {
-    let timeThreshold = Date.now() - timeDelta;
-    Object.keys(this._frequencyCaps).forEach(url => {
-      // remove url if it is not ignorable and wasn't updated for a while
-      if (!url.startsWith("ignore") && this._frequencyCaps[url].lastUpdated <= timeThreshold) {
-        delete this._frequencyCaps[url];
-      }
-    });
-  },
-
-  /**
-   * Checks if supplied timestamp happened today
-   * @param timestamp in milliseconds
-   * @return true if the timestamp was made today, false otherwise
-   */
-  _wasToday: function DirectoryLinksProvider_wasToday(timestamp) {
-    let showOn = new Date(timestamp);
-    let today = new Date();
-    // call timestamps identical if both day and month are same
-    return showOn.getDate() == today.getDate() &&
-           showOn.getMonth() == today.getMonth() &&
-           showOn.getYear() == today.getYear();
-  },
-
-  /**
-   * adds some number of views for a url
-   * @param url String url of the suggested link
-   */
-  _addFrequencyCapView: function DirectoryLinksProvider_addFrequencyCapView(url) {
-    let capObject = this._frequencyCaps[url];
-    // sanity check
-    if (!capObject) {
-      return;
-    }
-
-    // if the day is new: reset the daily counter and lastShownDate
-    if (!this._wasToday(capObject.lastShownDate)) {
-      capObject.dailyViews = 0;
-      // update lastShownDate
-      capObject.lastShownDate = Date.now();
-    }
-
-    // bump both daily and total counters
-    capObject.totalViews++;
-    capObject.dailyViews++;
-
-    // if any of the caps is reached - update suggested tiles
-    if (capObject.totalViews >= capObject.totalCap ||
-        capObject.dailyViews >= capObject.dailyCap) {
-      this._updateSuggestedTile();
-    }
-  },
-
-  /**
-   * Sets clicked flag for link url
-   * @param url String url of the suggested link
-   */
-  _setFrequencyCapClick(url) {
-    let capObject = this._frequencyCaps[url];
-    // sanity check
-    if (!capObject) {
-      return;
-    }
-    capObject.clicked = true;
-    // and update suggested tiles, since current tile became invalid
-    this._updateSuggestedTile();
-  },
-
-  /**
-   * Tests frequency cap limits for link url
-   * @param url String url of the suggested link
-   * @return true if link is viewable, false otherwise
-   */
-  _testFrequencyCapLimits: function DirectoryLinksProvider_testFrequencyCapLimits(url) {
-    let capObject = this._frequencyCaps[url];
-    // sanity check: if url is missing - do not show this tile
-    if (!capObject) {
-      return false;
-    }
-
-    // check for clicked set or total views reached
-    if (capObject.clicked || capObject.totalViews >= capObject.totalCap) {
-      return false;
-    }
-
-    // otherwise check if link is over daily views limit
-    if (this._wasToday(capObject.lastShownDate) &&
-        capObject.dailyViews >= capObject.dailyCap) {
-      return false;
-    }
-
-    // we passed all cap tests: return true
-    return true;
-  },
-
-  /**
-   * Removes clicked flag from frequency cap entry for tile landing url
-   * @param url String url of the suggested link
-   * @return promise resolved upon disk write completion
-   */
-  _removeTileClick: function DirectoryLinksProvider_removeTileClick(url = "") {
-    // remove trailing slash, to accomodate Places sending site urls ending with '/'
-    let noTrailingSlashUrl = url.replace(/\/$/, "");
-    let capObject = this._frequencyCaps[url] || this._frequencyCaps[noTrailingSlashUrl];
-    // return resolved promise if capObject is not found
-    if (!capObject) {
-      return Promise.resolve();
-    }
-    // otherwise remove clicked flag
-    delete capObject.clicked;
-    return this._writeFrequencyCapFile();
-  },
-
-  /**
-   * Removes all clicked flags from frequency cap object
-   * @return promise resolved upon disk write completion
-   */
-  _removeAllTileClicks: function DirectoryLinksProvider_removeAllTileClicks() {
-    Object.keys(this._frequencyCaps).forEach(url => {
-      delete this._frequencyCaps[url].clicked;
-    });
-    return this._writeFrequencyCapFile();
-  },
-
-  /**
-   * Return the object to its pre-init state
-   */
-  reset: function DirectoryLinksProvider_reset() {
-    delete this.__linksURL;
-    this._removePrefsObserver();
-    this._removeObservers();
-  },
-
-  addObserver: function DirectoryLinksProvider_addObserver(aObserver) {
-    this._observers.add(aObserver);
-  },
-
-  removeObserver: function DirectoryLinksProvider_removeObserver(aObserver) {
-    this._observers.delete(aObserver);
-  },
-
-  _callObservers(methodName, ...args) {
-    for (let obs of this._observers) {
-      if (typeof(obs[methodName]) == "function") {
-        try {
-          obs[methodName](this, ...args);
-        } catch (err) {
-          Cu.reportError(err);
-        }
-      }
-    }
-  },
-
-  _removeObservers: function() {
-    this._observers.clear();
-  }
-};