Plugins page in BWSI session has unnecessary and misleading UI components

chrome/browser/resources/shared/js/chromeos/ui_account_tweaks.js

+// Copyright (c) 2012 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 This file contains methods that allow to tweak
+ * internal page UI based on the status of current user (owner/user/guest).
+ * It is assumed that required data is passed via i18n strings
+ * (using templateData variable) that are filled with call to
+ * AddAccountUITweaksLocalizedValues in ui_account_tweaks.cc.
+ * It is also assumed that tweaked page has chrome://resources/css/widgets.css
+ * included.
+ */
+
+cr.define('uiAccountTweaks', function() {
+
+  /////////////////////////////////////////////////////////////////////////////
+  // UIAccountTweaks class:
+
+  /**
+   * Encapsulated handling of ChromeOS accounts options page.
+   * @constructor
+   */
+  function UIAccountTweaks() {
+  }
+
+  /**
+   * @return {boolean} Whether the current user is owner or not.
+   */
+  UIAccountTweaks.currentUserIsOwner = function() {
+    return templateData['currentUserIsOwner'] == 'true';
+  };
+
+  /**
+   * @return {boolean} Whether we're currently in guest mode.
+   */
+  UIAccountTweaks.loggedInAsGuest = function() {
+    return templateData['loggedInAsGuest'] == 'true';
+  };
+
+  /**
+   * Disables or hides some elements in Guest mode in ChromeOS.
+   * All elements within given document with guest-visibility
+   * attribute are either hidden (for guest-visibility="hidden")
+   * or disabled (for guest-visibility="disabled").
+   *
+   * @param {Document} document Document that should processed.
+   */
+  UIAccountTweaks.applyGuestModeVisibility = function(document) {
+    if (!cr.isChromeOS || !UIAccountTweaks.loggedInAsGuest())
+      return;
+    var elements = document.querySelectorAll('[guest-visibility]');
+    for (var i = 0; i < elements.length; i++) {
+      var element = elements[i];
+      var visibility = element.getAttribute('guest-visibility');
+      if (visibility == 'hidden')
+        element.hidden = true;
+      else if (visibility == 'disabled')
+        UIAccountTweaks.disableElementsForGuest(element);
+    }
+  }
+
+  /**
+   * Disables and marks page elements for Guest mode.
+   * Adds guest-disabled css class to all elements within given subtree,
+   * disables interactive elements (input/select/button), and removes href
+   * attribute from <a> elements.
+   *
+   * @param {Element} element Root element of DOM subtree that should be
+   *     disabled.
+   */
+  UIAccountTweaks.disableElementsForGuest = function(element) {
+    UIAccountTweaks.disableElementForGuest_(element);
+
+    // Walk the tree, searching each ELEMENT node.
+    var walker = document.createTreeWalker(element,
+                                           NodeFilter.SHOW_ELEMENT,
+                                           null,
+                                           false);
+
+    var node = walker.nextNode();
+    while (node) {
+      UIAccountTweaks.disableElementForGuest_(node);
+      node = walker.nextNode();
+    }
+  };
+
+  /**
+   * Disables single element for Guest mode.
+   * Adds guest-disabled css class, adds disabled attribute for appropriate
+   * elements (input/select/button), and removes href attribute from
+   * <a> element.
+   *
+   * @private
+   * @param {Element} element Element that should be disabled.
+   */
+  UIAccountTweaks.disableElementForGuest_ = function(element) {
+    element.classList.add('guest-disabled');
+    if (element.nodeName == 'INPUT' ||
+        element.nodeName == 'SELECT' ||
+        element.nodeName == 'BUTTON')
+      element.disabled = true;
+    if (element.nodeName == 'A') {
+      element.onclick = function() {
+        return false;
+      };
+    }
+  };
+
+  // Export
+  return {
+    UIAccountTweaks: UIAccountTweaks
+  };
+
+});