RubberGlove/js/bomOverload.js

var bomOverloadFunction = function() {
  var oldNavigator = navigator;
  var altNav = {};
  var propertyNames = Object.getOwnPropertyNames(oldNavigator);
  for(var propertyIndex = 0; propertyIndex < propertyNames.length; propertyIndex++) {
    propertyName = propertyNames[propertyIndex];
    var descriptor = Object.getOwnPropertyDescriptor(navigator, propertyName);
    if(typeof descriptor.value != 'undefined') 
      delete descriptor['value'];
    if(typeof descriptor.get != 'undefined')
      delete descriptor['get'];
    var writable = false;
    if(typeof descriptor.set != 'undefined') {
      delete descriptor['set'];
      writable = true;
    }
    if(typeof descriptor.writable != 'undefined') {
      if(descriptor.writable == 'true') writable = true;
      delete descriptor['writable'];
    }
    if(propertyName == 'plugins') {
      console.log('RubberGlove: Cloaking plugins for ' + window.location.href);
      var plugins = { };
      Object.defineProperty(plugins, 'length', { 'get': function() {
        var eventNode = document.currentScript.parentNode;
        return function() {
          console.error('RubberGlove: Enumeration of navigator.plugins blocked for ' + window.location.href);
          window.postMessage({ type: 'RubberGlove', text: 'navigator.plugins' }, '*');
          return 0;
        };
      }(), enumerable: true});
      if(typeof descriptor.get == 'function')
        delete descriptor['get'];
      plugins.item = function() {
        var item = function(index) { return; };
        item.toString = function() { return "function item() { [native code] }"; };
        return item; // function(index) { return item(index); };
      }();
      plugins.namedItem = function() {
        var fakePlugins = plugins;
        var namedItem = function(name) { return fakePlugins[name]; };
        namedItem.toString = function() { return "function namedItem() { [native code] }"; };
        return namedItem; //function(name) { return namedItem(name); };
      }();
      plugins.refresh = function() {
        var fakePlugins = plugins;
        var realPlugins = oldNavigator.plugins;
        var refresh = function() {
          realPlugins.refresh();
          for(var property in fakePlugins) {
            if(property != 'refresh' && property != 'item' && property != 'namedItem' && property != 'length') {
              delete fakePlugins[property];
            }
          }
          for(var n = 0; n < realPlugins.length; n++) {
            var plugin = realPlugins[n];
            //console.log('RubberGlove: Cloaking \'' + plugin.name + '\'');
            if(typeof plugin.name != 'undefined' && plugin.name != null && plugin.name != '' && plugin.name != ' ')
              Object.defineProperty(fakePlugins, plugin.name, { 'value': plugin });
          }
        };
        refresh.toString = function() { return "function refresh() { [native code] }"; };
        return refresh; //function() { return refresh(name); };
      }();
      plugins.refresh();
      descriptor.value = plugins;
    } else if(propertyName == 'mimeTypes') {
      console.log('RubberGlove: Cloaking mimeTypes for ' + window.location.href);
      var mimeTypes = { };
      Object.defineProperty(mimeTypes, 'length', { 'get': function() {
        var eventNode = document.currentScript.parentNode;
        return function() {
          console.error('RubberGlove: Enumeration of navigator.mimeTypes blocked');
          window.postMessage({ type: 'RubberGlove', text: 'navigator.mimeTypes' }, '*');
          return 0;
        };
      }(), enumerable: true});
      if(typeof descriptor.get == 'function')
        delete descriptor['get'];
      mimeTypes.item = function() {
        var item = function(index) { return; };
        item.toString = function() { return "function item() { [native code] }"; };
        return item; // function(index) { return item(index); };
      }();
      for(var n = 0; n < oldNavigator.mimeTypes.length; n++) {
        var mimeType = oldNavigator.mimeTypes[n];
        //console.log('RubberGlove: Cloaking \'' + mimeType.type + '\'');
        if(typeof mimeType.type != 'undefined' && mimeType.type != null && mimeType.type != '' && mimeType.type != ' ')
          Object.defineProperty(mimeTypes, mimeType.type, { 'value': mimeType });
      }
      descriptor.value = mimeTypes;
    } else {
      //console.log("RubberGlove: wrapping " + propertyName);
      descriptor.get = function() {
        var prop = propertyName;
        var nav = oldNavigator;
        return function() { return nav[prop] }; 
      }();
      if(writable) {
        descriptor.set = function(value) {
          var prop = propertyName;
          var nav = oldNavigator;
          return function() { nav[prop] = value; };
        }();
      }
    }
    Object.defineProperty(altNav, propertyName, descriptor);
  }
  for(propertyName in oldNavigator) {
    if(typeof(oldNavigator[propertyName]) == "function") {
      //console.log("RubberGlove: Wrapping function " + propertyName + "()");
      altNav[propertyName] = oldNavigator[propertyName];
    }
  }
  return altNav;
}