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Improved function overload hiding

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This commit is contained in:
jsclary
2014-07-08 17:56:28 -05:00
parent 83a7df1896
commit 7e10fb2a92
1 changed files with 41 additions and 32 deletions
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js/bomOverload.js
+41 -32
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@@ -1,10 +1,18 @@
var bomOverloadFunction = function() {
function fakeNativeCode(name, func) {
Object.defineProperty(func, 'toString', { configurable: false, value: function() {
return 'function ' + name + '() { [native code] }';
}});
return func;
}
// Hides source code when it contains "// native(functionName)" or
// "/* native(functionName)" at the beginning of the function body.
Function.prototype.toString = (function() {
var toString = Function.prototype.toString;
return function(thisArg, argsArray) {
// native(toString) <-- yes, it handles itself
var result = toString.apply(this, Array.prototype.slice.apply(arguments));
var match = result.match(/^\s*?function.*?\(.*?\)\s*?{\s*?\/[\*\/]\s*?native\((.*?)\)/);
if(match != null && match.length > 1)
return 'function ' + match[1] + '() { [native code] }';
return result;
};
})();
var navWrapper = (function() {
var oldNavigator = navigator;
var altNav = {};
@@ -34,27 +42,28 @@ var bomOverloadFunction = function() {
case 'plugins':
console.log('RubberGlove: Cloaking plugins for ' + window.location.href);
var plugins = { };
Object.defineProperty(plugins, 'length', { 'get': fakeNativeCode("", (function() {
Object.defineProperty(plugins, 'length', { 'get': (function() {
var eventNode = document.currentScript.parentNode;
return function() {
// native()
console.error('RubberGlove: Iteration of navigator.plugins blocked for ' + window.location.href + ' (Informational, not an error.)');
window.postMessage({ type: 'RubberGlove', text: 'navigator.plugins', url: window.location.href }, '*');
return 0;
};
})()), enumerable: true});
if(typeof descriptor.get == 'function') delete descriptor['get'];
plugins.item = fakeNativeCode('item', (function() {
})(), enumerable: true});
plugins.item = (function() {
var fakePlugins = plugins;
return function(index) { return fakePlugins[index]; };
})());
plugins.namedItem = fakeNativeCode('namedItem', (function() {
return function(index) { /* native(item) */ return fakePlugins[index]; };
})();
plugins.namedItem = (function() {
var fakePlugins = plugins;
return function(name) { return fakePlugins[name]; };
})());
plugins.refresh = fakeNativeCode('refresh', (function() {
return function(name) { /* native(namedItem) */ return fakePlugins[name]; };
})();
plugins.refresh = (function() {
var fakePlugins = plugins;
var realPlugins = oldNavigator.plugins;
return function() {
// native(refresh)
// Refresh the real plugins list
// TODO: We probably shouldn't call this the first time if possible
realPlugins.refresh();
@@ -72,7 +81,7 @@ var bomOverloadFunction = function() {
Object.defineProperty(fakePlugins, plugin.name, { 'value': plugin, configurable: true });
}
};
})());
})();
// Refresh to initially populate the plugins
plugins.refresh();
descriptor.value = plugins;
@@ -82,19 +91,19 @@ var bomOverloadFunction = function() {
case 'mimeTypes':
console.log('RubberGlove: Cloaking mimeTypes for ' + window.location.href);
var mimeTypes = { };
Object.defineProperty(mimeTypes, 'length', { 'get': fakeNativeCode("", (function() {
Object.defineProperty(mimeTypes, 'length', { 'get': (function() {
var eventNode = document.currentScript.parentNode;
return function() {
// native()
console.error('RubberGlove: Iteration of navigator.mimeTypes blocked for ' + window.location.href + ' (Informational, not an error.)');
window.postMessage({ type: 'RubberGlove', text: 'navigator.mimeTypes', url: window.location.href }, '*');
return 0;
};
})()), enumerable: true});
if(typeof descriptor.get == 'function') delete descriptor['get'];
mimeTypes.item = fakeNativeCode('item', (function() {
})(), enumerable: true});
mimeTypes.item = (function() {
var fakeMimeTypes = mimeTypes;
return function(index) { return fakeMimeTypes[index]; };
})());
return function(index) { /* native(item) */ return fakeMimeTypes[index]; };
})();
// Add mimeTypes so they are accessible by key but not index
for(var n = 0; n < oldNavigator.mimeTypes.length; n++) {
var mimeType = oldNavigator.mimeTypes[n];
@@ -105,32 +114,32 @@ var bomOverloadFunction = function() {
descriptor.value = mimeTypes;
break;
// wrap any non-object properties of navigator
// wrap any other properties of navigator
default:
//console.log("RubberGlove: wrapping " + propertyName);
descriptor.get = fakeNativeCode("", (function() {
descriptor.get = (function() {
var prop = propertyName;
var nav = oldNavigator;
return function() { return nav[prop] };
})());
return function() { /* native() */ return nav[prop] };
})();
if(writable) {
descriptor.set = fakeNativeCode("", (function(value) {
descriptor.set = (function(value) {
var prop = propertyName;
var nav = oldNavigator;
return function() { nav[prop] = value; };
})());
return function() { /* native(item) */ nav[prop] = value; };
})();
}
break;
}
Object.defineProperty(altNav, propertyName, descriptor);
}
// Add any functions
// Add or wrap any functions
for(propertyName in oldNavigator) {
if(typeof(oldNavigator[propertyName]) == "function") {
switch(propertyName) {
default:
//console.log("RubberGlove: Wrapping function " + propertyName + "()");
//console.log("RubberGlove: Adding function " + propertyName + "()");
altNav[propertyName] = oldNavigator[propertyName];
break;
}