Revert 274558 "Move some extensions renderer resources to extens..."

trunk/src/extensions/renderer/resources/platform_app.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.
-
-var $console = window.console;
-
-/**
- * Returns a function that logs a 'not available' error to the console and
- * returns undefined.
- *
- * @param {string} messagePrefix text to prepend to the exception message.
- */
-function generateDisabledMethodStub(messagePrefix, opt_messageSuffix) {
-  var message = messagePrefix + ' is not available in packaged apps.';
-  if (opt_messageSuffix) message = message + ' ' + opt_messageSuffix;
-  return function() {
-    $console.error(message);
-    return;
-  };
-}
-
-/**
- * Returns a function that throws a 'not available' error.
- *
- * @param {string} messagePrefix text to prepend to the exception message.
- */
-function generateThrowingMethodStub(messagePrefix, opt_messageSuffix) {
-  var message = messagePrefix + ' is not available in packaged apps.';
-  if (opt_messageSuffix) message = message + ' ' + opt_messageSuffix;
-  return function() {
-    throw new Error(message);
-  };
-}
-
-/**
- * Replaces the given methods of the passed in object with stubs that log
- * 'not available' errors to the console and return undefined.
- *
- * This should be used on methods attached via non-configurable properties,
- * such as window.alert. disableGetters should be used when possible, because
- * it is friendlier towards feature detection.
- *
- * In most cases, the useThrowingStubs should be false, so the stubs used to
- * replace the methods log an error to the console, but allow the calling code
- * to continue. We shouldn't break library code that uses feature detection
- * responsibly, such as:
- *     if(window.confirm) {
- *       var result = window.confirm('Are you sure you want to delete ...?');
- *       ...
- *     }
- *
- * useThrowingStubs should only be true for methods that are deprecated in the
- * Web platform, and should not be used by a responsible library, even in
- * conjunction with feature detection. A great example is document.write(), as
- * the HTML5 specification recommends against using it, and says that its
- * behavior is unreliable. No reasonable library code should ever use it.
- * HTML5 spec: http://www.w3.org/TR/html5/dom.html#dom-document-write
- *
- * @param {Object} object The object with methods to disable. The prototype is
- *     preferred.
- * @param {string} objectName The display name to use in the error message
- *     thrown by the stub (this is the name that the object is commonly referred
- *     to by web developers, e.g. "document" instead of "HTMLDocument").
- * @param {Array.<string>} methodNames names of methods to disable.
- * @param {Boolean} useThrowingStubs if true, the replaced methods will throw
- *     an error instead of silently returning undefined
- */
-function disableMethods(object, objectName, methodNames, useThrowingStubs) {
-  $Array.forEach(methodNames, function(methodName) {
-    var messagePrefix = objectName + '.' + methodName + '()';
-    object[methodName] = useThrowingStubs ?
-        generateThrowingMethodStub(messagePrefix) :
-        generateDisabledMethodStub(messagePrefix);
-  });
-}
-
-/**
- * Replaces the given properties of the passed in object with stubs that log
- * 'not available' warnings to the console and return undefined when gotten. If
- * a property's setter is later invoked, the getter and setter are restored to
- * default behaviors.
- *
- * @param {Object} object The object with properties to disable. The prototype
- *     is preferred.
- * @param {string} objectName The display name to use in the error message
- *     thrown by the getter stub (this is the name that the object is commonly
- *     referred to by web developers, e.g. "document" instead of
- *     "HTMLDocument").
- * @param {Array.<string>} propertyNames names of properties to disable.
- */
-function disableGetters(object, objectName, propertyNames, opt_messageSuffix) {
-  $Array.forEach(propertyNames, function(propertyName) {
-    var stub = generateDisabledMethodStub(objectName + '.' + propertyName,
-                                          opt_messageSuffix);
-    stub._is_platform_app_disabled_getter = true;
-    $Object.defineProperty(object, propertyName, {
-      configurable: true,
-      enumerable: false,
-      get: stub,
-      set: function(value) {
-        var descriptor = $Object.getOwnPropertyDescriptor(this, propertyName);
-        if (!descriptor || !descriptor.get ||
-            descriptor.get._is_platform_app_disabled_getter) {
-          // The stub getter is still defined.  Blow-away the property to
-          // restore default getter/setter behaviors and re-create it with the
-          // given value.
-          delete this[propertyName];
-          this[propertyName] = value;
-        } else {
-          // Do nothing.  If some custom getter (not ours) has been defined,
-          // there would be no way to read back the value stored by a default
-          // setter. Also, the only way to clear a custom getter is to first
-          // delete the property.  Therefore, the value we have here should
-          // just go into a black hole.
-        }
-      }
-    });
-  });
-}
-
-/**
- * Replaces the given properties of the passed in object with stubs that log
- * 'not available' warnings to the console when set.
- *
- * @param {Object} object The object with properties to disable. The prototype
- *     is preferred.
- * @param {string} objectName The display name to use in the error message
- *     thrown by the setter stub (this is the name that the object is commonly
- *     referred to by web developers, e.g. "document" instead of
- *     "HTMLDocument").
- * @param {Array.<string>} propertyNames names of properties to disable.
- */
-function disableSetters(object, objectName, propertyNames, opt_messageSuffix) {
-  $Array.forEach(propertyNames, function(propertyName) {
-    var stub = generateDisabledMethodStub(objectName + '.' + propertyName,
-                                          opt_messageSuffix);
-    $Object.defineProperty(object, propertyName, {
-      configurable: true,
-      enumerable: false,
-      get: function() {
-        return;
-      },
-      set: stub
-    });
-  });
-}
-
-// Disable benign Document methods.
-disableMethods(HTMLDocument.prototype, 'document', ['open', 'clear', 'close']);
-
-// Replace evil Document methods with exception-throwing stubs.
-disableMethods(HTMLDocument.prototype, 'document', ['write', 'writeln'], true);
-
-// Disable history.
-Object.defineProperty(window, "history", { value: {} });
-disableGetters(window.history, 'history', ['back', 'forward', 'go', 'length']);
-
-// Disable find.
-disableMethods(Window.prototype, 'window', ['find']);
-
-// Disable modal dialogs. Shell windows disable these anyway, but it's nice to
-// warn.
-disableMethods(Window.prototype, 'window', ['alert', 'confirm', 'prompt']);
-
-// Disable window.*bar.
-disableGetters(window, 'window',
-    ['locationbar', 'menubar', 'personalbar', 'scrollbars', 'statusbar',
-     'toolbar']);
-
-// Disable window.localStorage.
-// Sometimes DOM security policy prevents us from doing this (e.g. for data:
-// URLs) so wrap in try-catch.
-try {
-  disableGetters(window, 'window',
-      ['localStorage'],
-      'Use chrome.storage.local instead.');
-} catch (e) {}
-
-// Document instance properties that we wish to disable need to be set when
-// the document begins loading, since only then will the "document" reference
-// point to the page's document (it will be reset between now and then).
-// We can't listen for the "readystatechange" event on the document (because
-// the object that it's dispatched on doesn't exist yet), but we can instead
-// do it at the window level in the capturing phase.
-window.addEventListener('readystatechange', function(event) {
-  if (document.readyState != 'loading')
-    return;
-
-  // Deprecated document properties from
-  // https://developer.mozilla.org/en/DOM/document.
-  // To deprecate document.all, simply changing its getter and setter would
-  // activate its cache mechanism, and degrade the performance. Here we assign
-  // it first to 'undefined' to avoid this.
-  document.all = undefined;
-  disableGetters(document, 'document',
-      ['alinkColor', 'all', 'bgColor', 'fgColor', 'linkColor', 'vlinkColor']);
-}, true);
-
-// Disable onunload, onbeforeunload.
-disableSetters(Window.prototype, 'window', ['onbeforeunload', 'onunload']);
-var windowAddEventListener = Window.prototype.addEventListener;
-Window.prototype.addEventListener = function(type) {
-  if (type === 'unload' || type === 'beforeunload')
-    generateDisabledMethodStub(type)();
-  else
-    return $Function.apply(windowAddEventListener, window, arguments);
-};