ios/web/web_state/js/resources/dialog_overrides.js

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 goog.provide('__crWeb.dialogOverrides');
   6
   7 goog.require('__crWeb.core');
   8 // window.open override for dialog suppression must be performed after the rest
   9 // of window.open overrides which are done in __crWeb.windowOpen module.
  10 goog.require('__crWeb.windowOpen');
  11
  12 // Namespace for this module.
  13 __gCrWeb.dialogOverrides = {};
  14
  15 // Beginning of anonymous object.
  16 (function() {
  17   /*
  18    * Install a wrapper around functions displaying dialogs in order to catch
  19    * code displaying dialog.
  20    *
  21    * Since the Javascript on the page may cache the value of those functions
  22    * and invoke them later, we must only install the wrapper once and change
  23    * their behaviour when required.
  24    *
  25    * Returns a function that allows changing the value of the two booleans
  26    * |suppressDialogs| and |notifyAboutDialogs| that are tested by the wrappers.
  27    */
  28   var installDialogOverridesMethods = function() {
  29     var suppressDialogs = false;
  30     var notifyAboutDialogs = false;
  31
  32     // Returns a wrapper function around |originalDialog|. The wrapper may
  33     // suppress the dialog and notify host about show/suppress.
  34     var makeDialogWrapper = function(originalDialogGetter) {
  35       return function() {
  36         if (!suppressDialogs) {
  37           if (notifyAboutDialogs) {
  38             __gCrWeb.message.invokeOnHost({'command': 'dialog.willShow'});
  39           }
  40           return originalDialogGetter().apply(null, arguments);
  41         } else if (notifyAboutDialogs) {
  42           __gCrWeb.message.invokeOnHost({'command': 'dialog.suppressed'});
  43         }
  44       };
  45     };
  46
  47     // Install wrapper around the following properties of |window|.
  48     var wrappedFunctionNames = ['alert', 'confirm', 'prompt', 'open'];
  49     var len = wrappedFunctionNames.length;
  50     for (var i = 0; i < len; i++) {
  51       (function(wrappedFunctionName) {
  52         var wrappedDialogMethod = window[wrappedFunctionName];
  53         window[wrappedFunctionName] = makeDialogWrapper(
  54           function() { return wrappedDialogMethod; });
  55       })(wrappedFunctionNames[i]);
  56     }
  57
  58     // Reading or writing to the property 'geolocation' too early breaks
  59     // the API. Make a copy of navigator and stub in the required methods
  60     // without touching the property. See crbug.com/280818 for more
  61     // details.
  62     var stubNavigator = {};
  63
  64     // Copy all properties and functions without touching 'geolocation'.
  65     var oldNavigator = navigator;
  66     for (var keyName in navigator) {
  67       if (keyName !== 'geolocation') {
  68         var value = navigator[keyName];
  69         if (typeof(value) == 'function') {
  70           // Forward functions calls to real navigator.
  71           stubNavigator[keyName] = function() {
  72             return value.apply(oldNavigator, arguments);
  73           }
  74         } else {
  75           Object['defineProperty'](stubNavigator, keyName, {
  76             value: value,
  77             configurable: false,
  78             writable: false,
  79             enumerable: true
  80           });
  81         }
  82       }
  83     }
  84
  85     // Stub in 'geolocation' if necessary, using delayed accessor for the
  86     // 'geolocation' property of the original |navigator|.
  87     if ('geolocation' in navigator) {
  88       var geolocation = {};
  89       var geoPropNames = ['getCurrentPosition', 'watchPosition', 'clearWatch'];
  90       var len = geoPropNames.length;
  91       for (var i = 0; i < len; i++) {
  92         (function(geoPropName) {
  93           geolocation[geoPropName] = makeDialogWrapper(function() {
  94              return function() {
  95                return oldNavigator.geolocation[geoPropName].apply(
  96                    oldNavigator.geolocation, arguments);
  97              };
  98           });
  99         })(geoPropNames[i]);
 100       }
 101       stubNavigator.geolocation = geolocation;
 102     }
 103
 104     // Install |stubNavigator| as |navigator|.
 105     /** @suppress {const} */
 106     navigator = stubNavigator;
 107
 108     // Returns the closure allowing to change |suppressDialogs| and
 109     // |notifyAboutDialogs| variables.
 110     return function(setEnabled, setNotify) {
 111       suppressDialogs = setEnabled;
 112       notifyAboutDialogs = setNotify;
 113     };
 114   };
 115
 116   // Override certain methods that produce dialogs. This needs to be installed
 117   // after other window methods overrides.
 118   __gCrWeb['setSuppressDialogs'] = installDialogOverridesMethods();
 119
 120 }());  // End of anonymous object