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CanvasBlocker/lib/intercept.js

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/* jslint moz: true */
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
(function(){
"use strict";
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const {changedFunctions, setRandomSupply} = require("./modifiedAPI");
const randomSupplies = require("./randomSupplies");
setRandomSupply(randomSupplies.nonPersistent);
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var apiNames = Object.keys(changedFunctions);
var undef;
var exportFunction = require("chrome").Cu.exportFunction;
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function setRandomSupplyByType(type){
switch (type){
case "persistent":
setRandomSupply(randomSupplies.persistent);
break;
default:
setRandomSupply(randomSupplies.nonPersistent);
}
}
exports.setRandomSupplyByType = setRandomSupplyByType;
function getURL(window){
if (!window.location.href || window.location.href === "about:blank"){
if (window !== window.parent){
return getURL(window.parent);
}
else if (window.opener){
return getURL(window.opener);
}
}
return window.location.href;
}
exports.intercept = function intercept({subject: window}, {check, checkStack, ask, notify, prefs}){
var siteStatus = check({url: getURL(window)});
if (siteStatus.mode !== "allow"){
apiNames.forEach(function(name){
var changedFunction = changedFunctions[name];
if (changedFunction.getStatus(undefined, siteStatus).active){
(Array.isArray(changedFunction.object)? changedFunction.object: [changedFunction.object]).forEach(function(object){
var constructor = window.wrappedJSObject[object];
if (constructor){
var original = constructor.prototype[name];
Object.defineProperty(
constructor.prototype,
name,
{
enumerable: true,
configureable: false,
get: function(){
var url = getURL(window);
if (!url){
return undef;
}
var error = new Error();
if (checkStack(error.stack)){
return original;
}
var funcStatus = changedFunction.getStatus(this, siteStatus);
if (funcStatus.active){
if (funcStatus.mode === "ask"){
funcStatus.mode = ask({window: window, type: changedFunction.type, canvas: this, errorStack: error.stack});
}
switch (funcStatus.mode){
case "allow":
return original;
case "fake":
setRandomSupplyByType(prefs("rng"));
var fake = changedFunction.fakeGenerator(prefs, function(messageId){
notify({url, errorStack: error.stack, messageId});
}, original);
switch (fake){
case true:
return original;
case false:
return undef;
default:
return exportFunction(fake, window.wrappedJSObject);
}
//case "block":
default:
return undef;
}
}
else {
return original;
}
}
}
);
}
});
}
});
}
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};
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}());