Upstream ios/web/ JS files

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

+// Copyright 2014 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.
+
+goog.provide('__crweb.dialog_overrides');
+
+// Namespace for this module.
+__gCrWeb.dialogOverrides = {};
+
+// Beginning of anonymous object.
+new function() {
+  /*
+   * Install a wrapper around functions displaying dialogs in order to catch
+   * code displaying dialog.
+   *
+   * Since the Javascript on the page may cache the value of those functions
+   * and invoke them later, we must only install the wrapper once and change
+   * their behaviour when required.
+   *
+   * Returns a function that allows changing the value of the two booleans
+   * |suppressDialogs| and |notifyAboutDialogs| that are tested by the wrappers.
+   */
+  var installDialogOverridesMethods = function() {
+    var suppressDialogs = false;
+    var notifyAboutDialogs = false;
+
+    // Returns a wrapper function around |originalDialog|. The wrapper may
+    // suppress the dialog and notify host about show/suppress.
+    var makeDialogWrapper = function(originalDialogGetter) {
+      return function() {
+        if (!suppressDialogs) {
+          if (notifyAboutDialogs) {
+            __gCrWeb.message.invokeOnHost({'command': 'dialog.willShow'});
+          }
+          return originalDialogGetter().apply(null, arguments);
+        } else if (notifyAboutDialogs) {
+          __gCrWeb.message.invokeOnHost({'command': 'dialog.suppressed'});
+        }
+      };
+    };
+
+    // Install wrapper around the following properties of |window|.
+    var wrappedFunctionNames = ['alert', 'confirm', 'prompt', 'open'];
+    var len = wrappedFunctionNames.length;
+    for (var i = 0; i < len; i++) {
+      (function(wrappedFunctionName) {
+        var wrappedDialogMethod = window[wrappedFunctionName];
+        window[wrappedFunctionName] = makeDialogWrapper(
+          function() { return wrappedDialogMethod; });
+      })(wrappedFunctionNames[i]);
+    }
+
+    // Reading or writing to the property 'geolocation' too early breaks
+    // the API. Make a copy of navigator and stub in the required methods
+    // without touching the property. See crbug.com/280818 for more
+    // details.
+    var stubNavigator = {};
+
+    // Copy all properties and functions without touching 'geolocation'.
+    var oldNavigator = navigator;
+    for (var keyName in navigator) {
+      if (keyName !== 'geolocation') {
+        var value = navigator[keyName];
+        if (typeof(value) == 'function') {
+          // Forward functions calls to real navigator.
+          stubNavigator[keyName] = function() {
+            return value.apply(oldNavigator, arguments);
+          }
+        } else {
+          Object['defineProperty'](stubNavigator, keyName, {
+            value: value,
+            configurable: false,
+            writable: false,
+            enumerable: true
+          });
+        }
+      }
+    }
+
+    // Stub in 'geolocation' if necessary, using delayed accessor for the
+    // 'geolocation' property of the original |navigator|.
+    if ('geolocation' in navigator) {
+      var geolocation = {};
+      var geoPropNames = ['getCurrentPosition', 'watchPosition', 'clearWatch'];
+      var len = geoPropNames.length;
+      for (var i = 0; i < len; i++) {
+        (function(geoPropName) {
+          geolocation[geoPropName] = makeDialogWrapper(function() {
+             return function() {
+               return oldNavigator.geolocation[geoPropName].apply(
+                   oldNavigator.geolocation, arguments);
+             };
+          });
+        })(geoPropNames[i]);
+      }
+      stubNavigator.geolocation = geolocation;
+    }
+
+    // Install |stubNavigator| as |navigator|.
+    navigator = stubNavigator;
+
+    // Returns the closure allowing to change |suppressDialogs| and
+    // |notifyAboutDialogs| variables.
+    return function(setEnabled, setNotify) {
+      suppressDialogs = setEnabled;
+      notifyAboutDialogs = setNotify;
+    };
+  };
+
+  // Override certain methods that produce dialogs. This needs to be installed
+  // after other window methods overrides.
+  __gCrWeb['setSuppressDialogs'] = installDialogOverridesMethods();
+
+}  // End of anonymous object