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+/* 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;
+ try {
+ matchOS = Services.prefs.getBoolPref(PREF_MATCH_OS_LOCALE);
+ } catch (e) {}
+
+ 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(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);
+ }
+ });
+ } else {
+ // 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
+ // 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);
+ 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() {
+ 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(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() {
+ NewTabUtils.links.populateProviderCache(NewTabUtils.placesProvider, () => {
+ this._handleManyLinksChanged();
+ });
+ },
+
+ onDeleteURI(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() {
+ // remove all clicked flags and call observers upon file write
+ this._removeAllTileClicks().then(() => {
+ this._callObservers("onClearHistory");
+ });
+ },
+
+ onLinkChanged(aProvider, aLink) {
+ // Make sure NewTabUtils.links handles the notification first.
+ setTimeout(() => {
+ if (this._handleLinkChanged(aLink) || this._shouldUpdateSuggestedTile()) {
+ this._updateSuggestedTile();
+ }
+ }, 0);
+ },
+
+ onManyLinksChanged() {
+ // Make sure NewTabUtils.links handles the notification first.
+ setTimeout(() => {
+ this._handleManyLinksChanged();
+ }, 0);
+ },
+
+ _getCurrentTopSiteCount() {
+ 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() {
+ 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() {
+ 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() {
+ this._observers.clear();
+ }
+};