Publish the source for CFInstall.min.js .

chrome_frame/cfinstall/src/stub/chromeframe.js

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview Logic for interrogating / manipulating the local Chrome Frame
+ * installation.
+ *
+ **/
+goog.provide('google.cf.ChromeFrame');
+
+/**
+ * Constructs an object for interacting with Chrome Frame through the provided
+ * Window instance.
+ * @constructor
+ * @param {Window=} opt_windowInstance The browser window through which to
+ *     interact with Chrome Frame. Defaults to the global window object.
+ **/
+google.cf.ChromeFrame = function(opt_windowInstance) {
+  /**
+   * @private
+   * @const
+   * @type {!Window}
+   **/
+  this.window_ = opt_windowInstance || window;
+};
+
+/**
+ * The name of the Chrome Frame ActiveX control.
+ * @const
+ * @type {string}
+ **/
+google.cf.ChromeFrame.CONTROL_NAME = 'ChromeTab.ChromeFrame';
+
+/**
+ * Determines whether ChromeFrame is supported on the current platform.
+ * @return {boolean} Whether Chrome Frame is supported on the current platform.
+ */
+google.cf.ChromeFrame.prototype.isPlatformSupported = function() {
+  var ua = this.window_.navigator.userAgent;
+  var ieRe = /MSIE (\S+); Windows NT/;
+
+  if (!ieRe.test(ua))
+    return false;
+
+  // We also only support Win2003/XPSP2 or better. See:
+  //  http://msdn.microsoft.com/en-us/library/ms537503%28VS.85%29.aspx .
+  // 'SV1' indicates SP2, only bail if not SP2 or Win2K3
+  if (parseFloat(ieRe.exec(ua)[1]) < 6 && ua.indexOf('SV1') < 0)
+    return false;
+
+  return true;
+};
+
+/**
+ * Determines whether Chrome Frame is the currently active renderer.
+ * @return {boolean} Whether Chrome Frame is rendering the current page.
+ */
+google.cf.ChromeFrame.prototype.isActiveRenderer = function () {
+  return this.window_.externalHost ? true : false;
+};
+
+/**
+ * Determines if Google Chrome Frame is activated or locally available for
+ * activation in the current browser instance. In the latter case, will trigger
+ * its activation.
+ * @return {boolean} True if Google Chrome Frame already was active or was
+ *     locally available (and now active). False otherwise.
+ */
+google.cf.ChromeFrame.prototype.activate = function() {
+  // Look for CF in the User Agent before trying more expensive checks
+  var ua = this.window_.navigator.userAgent.toLowerCase();
+  if (ua.indexOf('chromeframe') >= 0)
+    return true;
+
+  if (typeof this.window_['ActiveXObject'] != 'undefined') {
+    try {
+      var chromeFrame =  /** @type {ChromeTab.ChromeFrame} */(
+          new this.window_.ActiveXObject(google.cf.ChromeFrame.CONTROL_NAME));
+      if (chromeFrame) {
+        // Register the BHO if it hasn't happened already.
+        chromeFrame.registerBhoIfNeeded();
+        return true;
+      }
+    } catch (e) {
+      // Squelch
+    }
+  }
+  return false;
+};