gecko-dev/browser/modules/DirectoryLinksProvider.jsm

1264 строки
42 KiB
JavaScript

/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
"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: 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) {
let pastImpressions;
// 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) {
// skip past_impressions for "unpin" to avoid chance of tracking
if (this._frequencyCaps[url] && action != "unpin") {
pastImpressions = {
total: this._frequencyCaps[url].totalViews,
daily: this._frequencyCaps[url].dailyViews
};
}
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();
}
};