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+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Closure user agent detection (Browser).
+ * @see <a href="http://www.useragentstring.com/">User agent strings</a>
+ * For more information on rendering engine, platform, or device see the other
+ * sub-namespaces in goog.labs.userAgent, goog.labs.userAgent.platform,
+ * goog.labs.userAgent.device respectively.)
+ *
+ * @author martone@google.com (Andy Martone)
+ */
+
+goog.provide('goog.labs.userAgent.browser');
+
+goog.require('goog.array');
+goog.require('goog.labs.userAgent.util');
+goog.require('goog.object');
+goog.require('goog.string');
+
+
+// TODO(nnaze): Refactor to remove excessive exclusion logic in matching
+// functions.
+
+
+/**
+ * @return {boolean} Whether the user's browser is Opera. Note: Chromium
+ * based Opera (Opera 15+) is detected as Chrome to avoid unnecessary
+ * special casing.
+ * @private
+ */
+goog.labs.userAgent.browser.matchOpera_ = function() {
+ return goog.labs.userAgent.util.matchUserAgent('Opera');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is IE.
+ * @private
+ */
+goog.labs.userAgent.browser.matchIE_ = function() {
+ return goog.labs.userAgent.util.matchUserAgent('Trident') ||
+ goog.labs.userAgent.util.matchUserAgent('MSIE');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Edge.
+ * @private
+ */
+goog.labs.userAgent.browser.matchEdge_ = function() {
+ return goog.labs.userAgent.util.matchUserAgent('Edge');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Firefox.
+ * @private
+ */
+goog.labs.userAgent.browser.matchFirefox_ = function() {
+ return goog.labs.userAgent.util.matchUserAgent('Firefox');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Safari.
+ * @private
+ */
+goog.labs.userAgent.browser.matchSafari_ = function() {
+ return goog.labs.userAgent.util.matchUserAgent('Safari') &&
+ !(goog.labs.userAgent.browser.matchChrome_() ||
+ goog.labs.userAgent.browser.matchCoast_() ||
+ goog.labs.userAgent.browser.matchOpera_() ||
+ goog.labs.userAgent.browser.matchEdge_() ||
+ goog.labs.userAgent.browser.isSilk() ||
+ goog.labs.userAgent.util.matchUserAgent('Android'));
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based
+ * iOS browser).
+ * @private
+ */
+goog.labs.userAgent.browser.matchCoast_ = function() {
+ return goog.labs.userAgent.util.matchUserAgent('Coast');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is iOS Webview.
+ * @private
+ */
+goog.labs.userAgent.browser.matchIosWebview_ = function() {
+ // iOS Webview does not show up as Chrome or Safari. Also check for Opera's
+ // WebKit-based iOS browser, Coast.
+ return (goog.labs.userAgent.util.matchUserAgent('iPad') ||
+ goog.labs.userAgent.util.matchUserAgent('iPhone')) &&
+ !goog.labs.userAgent.browser.matchSafari_() &&
+ !goog.labs.userAgent.browser.matchChrome_() &&
+ !goog.labs.userAgent.browser.matchCoast_() &&
+ goog.labs.userAgent.util.matchUserAgent('AppleWebKit');
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Chrome.
+ * @private
+ */
+goog.labs.userAgent.browser.matchChrome_ = function() {
+ return (goog.labs.userAgent.util.matchUserAgent('Chrome') ||
+ goog.labs.userAgent.util.matchUserAgent('CriOS')) &&
+ !goog.labs.userAgent.browser.matchEdge_();
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is the Android browser.
+ * @private
+ */
+goog.labs.userAgent.browser.matchAndroidBrowser_ = function() {
+ // Android can appear in the user agent string for Chrome on Android.
+ // This is not the Android standalone browser if it does.
+ return goog.labs.userAgent.util.matchUserAgent('Android') &&
+ !(goog.labs.userAgent.browser.isChrome() ||
+ goog.labs.userAgent.browser.isFirefox() ||
+ goog.labs.userAgent.browser.isOpera() ||
+ goog.labs.userAgent.browser.isSilk());
+};
+
+
+/**
+ * @return {boolean} Whether the user's browser is Opera.
+ */
+goog.labs.userAgent.browser.isOpera = goog.labs.userAgent.browser.matchOpera_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is IE.
+ */
+goog.labs.userAgent.browser.isIE = goog.labs.userAgent.browser.matchIE_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Edge.
+ */
+goog.labs.userAgent.browser.isEdge = goog.labs.userAgent.browser.matchEdge_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Firefox.
+ */
+goog.labs.userAgent.browser.isFirefox =
+ goog.labs.userAgent.browser.matchFirefox_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Safari.
+ */
+goog.labs.userAgent.browser.isSafari = goog.labs.userAgent.browser.matchSafari_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Coast (Opera's Webkit-based
+ * iOS browser).
+ */
+goog.labs.userAgent.browser.isCoast = goog.labs.userAgent.browser.matchCoast_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is iOS Webview.
+ */
+goog.labs.userAgent.browser.isIosWebview =
+ goog.labs.userAgent.browser.matchIosWebview_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is Chrome.
+ */
+goog.labs.userAgent.browser.isChrome = goog.labs.userAgent.browser.matchChrome_;
+
+
+/**
+ * @return {boolean} Whether the user's browser is the Android browser.
+ */
+goog.labs.userAgent.browser.isAndroidBrowser =
+ goog.labs.userAgent.browser.matchAndroidBrowser_;
+
+
+/**
+ * For more information, see:
+ * http://docs.aws.amazon.com/silk/latest/developerguide/user-agent.html
+ * @return {boolean} Whether the user's browser is Silk.
+ */
+goog.labs.userAgent.browser.isSilk = function() {
+ return goog.labs.userAgent.util.matchUserAgent('Silk');
+};
+
+
+/**
+ * @return {string} The browser version or empty string if version cannot be
+ * determined. Note that for Internet Explorer, this returns the version of
+ * the browser, not the version of the rendering engine. (IE 8 in
+ * compatibility mode will return 8.0 rather than 7.0. To determine the
+ * rendering engine version, look at document.documentMode instead. See
+ * http://msdn.microsoft.com/en-us/library/cc196988(v=vs.85).aspx for more
+ * details.)
+ */
+goog.labs.userAgent.browser.getVersion = function() {
+ var userAgentString = goog.labs.userAgent.util.getUserAgent();
+ // Special case IE since IE's version is inside the parenthesis and
+ // without the '/'.
+ if (goog.labs.userAgent.browser.isIE()) {
+ return goog.labs.userAgent.browser.getIEVersion_(userAgentString);
+ }
+
+ var versionTuples =
+ goog.labs.userAgent.util.extractVersionTuples(userAgentString);
+
+ // Construct a map for easy lookup.
+ var versionMap = {};
+ goog.array.forEach(versionTuples, function(tuple) {
+ // Note that the tuple is of length three, but we only care about the
+ // first two.
+ var key = tuple[0];
+ var value = tuple[1];
+ versionMap[key] = value;
+ });
+
+ var versionMapHasKey = goog.partial(goog.object.containsKey, versionMap);
+
+ // Gives the value with the first key it finds, otherwise empty string.
+ function lookUpValueWithKeys(keys) {
+ var key = goog.array.find(keys, versionMapHasKey);
+ return versionMap[key] || '';
+ }
+
+ // Check Opera before Chrome since Opera 15+ has "Chrome" in the string.
+ // See
+ // http://my.opera.com/ODIN/blog/2013/07/15/opera-user-agent-strings-opera-15-and-beyond
+ if (goog.labs.userAgent.browser.isOpera()) {
+ // Opera 10 has Version/10.0 but Opera/9.8, so look for "Version" first.
+ // Opera uses 'OPR' for more recent UAs.
+ return lookUpValueWithKeys(['Version', 'Opera']);
+ }
+
+ // Check Edge before Chrome since it has Chrome in the string.
+ if (goog.labs.userAgent.browser.isEdge()) {
+ return lookUpValueWithKeys(['Edge']);
+ }
+
+ if (goog.labs.userAgent.browser.isChrome()) {
+ return lookUpValueWithKeys(['Chrome', 'CriOS']);
+ }
+
+ // Usually products browser versions are in the third tuple after "Mozilla"
+ // and the engine.
+ var tuple = versionTuples[2];
+ return tuple && tuple[1] || '';
+};
+
+
+/**
+ * @param {string|number} version The version to check.
+ * @return {boolean} Whether the browser version is higher or the same as the
+ * given version.
+ */
+goog.labs.userAgent.browser.isVersionOrHigher = function(version) {
+ return goog.string.compareVersions(
+ goog.labs.userAgent.browser.getVersion(), version) >= 0;
+};
+
+
+/**
+ * Determines IE version. More information:
+ * http://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx#uaString
+ * http://msdn.microsoft.com/en-us/library/hh869301(v=vs.85).aspx
+ * http://blogs.msdn.com/b/ie/archive/2010/03/23/introducing-ie9-s-user-agent-string.aspx
+ * http://blogs.msdn.com/b/ie/archive/2009/01/09/the-internet-explorer-8-user-agent-string-updated-edition.aspx
+ *
+ * @param {string} userAgent the User-Agent.
+ * @return {string}
+ * @private
+ */
+goog.labs.userAgent.browser.getIEVersion_ = function(userAgent) {
+ // IE11 may identify itself as MSIE 9.0 or MSIE 10.0 due to an IE 11 upgrade
+ // bug. Example UA:
+ // Mozilla/5.0 (MSIE 9.0; Windows NT 6.1; WOW64; Trident/7.0; rv:11.0)
+ // like Gecko.
+ // See http://www.whatismybrowser.com/developers/unknown-user-agent-fragments.
+ var rv = /rv: *([\d\.]*)/.exec(userAgent);
+ if (rv && rv[1]) {
+ return rv[1];
+ }
+
+ var version = '';
+ var msie = /MSIE +([\d\.]+)/.exec(userAgent);
+ if (msie && msie[1]) {
+ // IE in compatibility mode usually identifies itself as MSIE 7.0; in this
+ // case, use the Trident version to determine the version of IE. For more
+ // details, see the links above.
+ var tridentVersion = /Trident\/(\d.\d)/.exec(userAgent);
+ if (msie[1] == '7.0') {
+ if (tridentVersion && tridentVersion[1]) {
+ switch (tridentVersion[1]) {
+ case '4.0':
+ version = '8.0';
+ break;
+ case '5.0':
+ version = '9.0';
+ break;
+ case '6.0':
+ version = '10.0';
+ break;
+ case '7.0':
+ version = '11.0';
+ break;
+ }
+ } else {
+ version = '7.0';
+ }
+ } else {
+ version = msie[1];
+ }
+ }
+ return version;
+};