mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-12-22 21:00:23 +01:00
394 lines
11 KiB
JavaScript
394 lines
11 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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(function(){
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"use strict";
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let scope;
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if ((typeof exports) !== "undefined"){
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scope = exports;
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}
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else {
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scope = require.register("./intercept", {});
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}
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const {changedFunctions, changedGetters, setRandomSupply} = require("./modifiedAPI");
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const randomSupplies = require("./randomSupplies");
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const {getWrapped} = require("./modifiedAPIFunctions");
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const logging = require("./logging");
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const settings = require("./settings");
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const extension = require("./extension");
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setRandomSupply(randomSupplies.nonPersistent);
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const apiNames = Object.keys(changedFunctions);
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let undef;
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function setRandomSupplyByType(type){
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switch (type){
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case "persistent":
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setRandomSupply(randomSupplies.persistent);
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break;
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case "constant":
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setRandomSupply(randomSupplies.constant);
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break;
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case "white":
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setRandomSupply(randomSupplies.white);
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break;
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default:
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setRandomSupply(randomSupplies.nonPersistent);
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}
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}
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settings.on("rng", function(){
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setRandomSupplyByType(settings.rng);
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});
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function getURL(window){
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let href;
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try {
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href = window.location.href;
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}
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catch (e){
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// unable to read location due to SOP
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// since we are not able to do anything in that case we can allow everything
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return "about:SOP";
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}
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if (!href || href === "about:blank"){
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if (window !== window.parent){
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return getURL(window.parent);
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}
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else if (window.opener){
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return getURL(window.opener);
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}
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}
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return href;
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}
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scope.preIntercept = function preIntercept({subject: window}, apis){
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if (!settings.isStillDefault){
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logging.message("settings already loaded -> no need to pre intercept");
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scope.intercept({subject: window}, apis);
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}
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else {
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logging.message("settings not loaded -> need to pre intercept");
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let forceLoad = true;
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let preIntercepted = false;
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let intercepted = false;
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const forEachFunction = function(callback){
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apiNames.forEach(function(name){
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const changedFunction = changedFunctions[name];
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(
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Array.isArray(changedFunction.object)?
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changedFunction.object:
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[changedFunction.object]
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).forEach(function(object){
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const constructor = getWrapped(window)[object];
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if (constructor){
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callback({name, object: constructor.prototype});
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}
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});
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});
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changedGetters.forEach(function(changedGetter){
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const name = changedGetter.name;
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changedGetter.objectGetters.forEach(function(objectGetter){
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const object = objectGetter(getWrapped(window));
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if (object){
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callback({name, object});
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}
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});
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});
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};
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let originalPropertyDescriptors = {};
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const doPreIntercept = function(){
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if (!preIntercepted){
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forEachFunction(function({name, object}){
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const map = originalPropertyDescriptors[name] || new WeakMap();
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originalPropertyDescriptors[name] = map;
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const originalPropertyDescriptor = Object.getOwnPropertyDescriptor(object, name);
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if (!originalPropertyDescriptor){
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return;
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}
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map.set(object, originalPropertyDescriptor);
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Object.defineProperty(
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object,
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name,
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{
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enumerable: true,
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configurable: true,
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get: exportFunction(function(){
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if (forceLoad){
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logging.warning("force load the settings. Calling stack:", (new Error()).stack);
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undoPreIntercept();
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settings.forceLoad();
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doRealIntercept();
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const descriptor = Object.getOwnPropertyDescriptor(object, name);
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return descriptor.value || descriptor.get.call(this);
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}
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else {
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logging.notice("API blocked (%s)", name);
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const url = getURL(window);
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if (!url){
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return undef;
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}
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const error = new Error();
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apis.notify({
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url,
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errorStack: error.stack,
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messageId: "preBlock",
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timestamp: new Date(),
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functionName: name,
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dataURL: false
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});
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return;
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}
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}, window),
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set: exportFunction(function(){}, window)
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}
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);
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});
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preIntercepted = true;
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}
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};
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const undoPreIntercept = function(){
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if (preIntercepted){
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preIntercepted = false;
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forEachFunction(function({name, object}){
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const originalPropertyDescriptor = originalPropertyDescriptors[name].get(object);
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if (originalPropertyDescriptor){
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Object.defineProperty(
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object,
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name,
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originalPropertyDescriptor
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);
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}
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});
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}
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};
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const doRealIntercept = function(){
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if (!intercepted){
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scope.intercept({subject: window}, apis);
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intercepted = true;
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}
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};
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doPreIntercept();
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settings.onloaded(function(){
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undoPreIntercept();
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doRealIntercept();
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});
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}
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};
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let extensionID = extension.extensionID;
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scope.intercept = function intercept({subject: window}, {check, checkStack, ask, notify, prefs}){
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function getDataURL(object, prefs){
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return (
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object &&
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prefs("storeImageForInspection") &&
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prefs("showNotifications")?
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(
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object instanceof HTMLCanvasElement?
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object.toDataURL():
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(
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object.canvas instanceof HTMLCanvasElement?
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object.canvas.toDataURL():
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false
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)
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):
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false
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);
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}
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function generateChecker(name, changedFunction, siteStatus, original){
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return function checker(callingDepth = 2){
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const error = new Error();
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const errorStack = error.stack;
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try {
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// return original if the extension itself requested the function
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if (
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errorStack
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.split("\n", callingDepth + 2)[callingDepth + 1]
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.split("@", callingDepth + 1)[1]
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.startsWith(extensionID)
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){
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return {allow: true, original, window};
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}
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}
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catch (e) {
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// stack had an unknown form
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}
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if (checkStack(errorStack)){
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return {allow: true, original, window};
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}
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const funcStatus = changedFunction.getStatus(this, siteStatus, prefs);
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const This = this;
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function notifyCallback(messageId){
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notify({
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url: getURL(window),
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errorStack,
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messageId,
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timestamp: new Date(),
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functionName: name,
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api: changedFunction.api,
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dataURL: getDataURL(This, prefs)
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});
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}
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const protectedAPIFeatures = prefs("protectedAPIFeatures");
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if (
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funcStatus.active &&
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(
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!protectedAPIFeatures.hasOwnProperty(name) ||
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protectedAPIFeatures[name]
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)
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){
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if (funcStatus.mode === "ask"){
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funcStatus.mode = ask({
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window: window,
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type: changedFunction.type,
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api: changedFunction.api,
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canvas: this instanceof HTMLCanvasElement?
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this:
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(
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this &&
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(this.canvas instanceof HTMLCanvasElement)?
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this.canvas:
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false
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),
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errorStack
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});
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}
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switch (funcStatus.mode){
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case "allow":
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return {allow: true, original, window};
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case "fake":
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return {
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allow: "fake",
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prefs,
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notify: notifyCallback,
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window,
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original
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};
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//case "block":
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default:
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return {
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allow: false,
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notify: notifyCallback
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};
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}
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}
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else {
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return {allow: true, original, window};
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}
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};
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}
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const siteStatus = check({url: getURL(window)});
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logging.verbose("status for page", window, siteStatus);
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if (siteStatus.mode !== "allow"){
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apiNames.forEach(function(name){
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const changedFunction = changedFunctions[name];
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const functionStatus = changedFunction.getStatus(undefined, siteStatus, prefs);
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logging.verbose("status for", name, ":", functionStatus);
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if (functionStatus.active){
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(
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Array.isArray(changedFunction.object)?
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changedFunction.object:
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[changedFunction.object]
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).forEach(function(object){
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const constructor = getWrapped(window)[object];
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if (constructor){
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const original = constructor.prototype[name];
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const checker = generateChecker(name, changedFunction, siteStatus, original);
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const descriptor = Object.getOwnPropertyDescriptor(constructor.prototype, name);
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if (descriptor){
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if (descriptor.hasOwnProperty("value")){
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if (changedFunction.fakeGenerator){
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descriptor.value = exportFunction(
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changedFunction.fakeGenerator(checker, original, window),
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window
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);
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}
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else {
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descriptor.value = null;
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}
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}
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else {
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descriptor.get = exportFunction(function(){
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return exportFunction(
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changedFunction.fakeGenerator(checker),
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window
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);
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}, window);
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}
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Object.defineProperty(constructor.prototype, name, descriptor);
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}
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}
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});
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}
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});
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changedGetters.forEach(function(changedGetter){
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const name = changedGetter.name;
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const functionStatus = changedGetter.getStatus(undefined, siteStatus, prefs);
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logging.verbose("status for", changedGetter, ":", functionStatus);
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if (functionStatus.active){
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changedGetter.objectGetters.forEach(function(objectGetter){
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const object = objectGetter(getWrapped(window));
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if (object){
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const descriptor = Object.getOwnPropertyDescriptor(object, name);
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if (descriptor && descriptor.hasOwnProperty("get")){
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const original = descriptor.get;
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const checker = generateChecker(name, changedGetter, siteStatus, original);
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const getter = changedGetter.getterGenerator(checker, original, window);
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descriptor.get = exportFunction(getter, window);
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if (descriptor.hasOwnProperty("set") && changedGetter.setterGenerator){
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const setter = changedGetter.setterGenerator(window, descriptor.set, prefs);
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descriptor.set = exportFunction(setter, window);
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}
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Object.defineProperty(object, name, descriptor);
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}
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else if (
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changedGetter.valueGenerator &&
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descriptor && descriptor.hasOwnProperty("value")
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){
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const protectedAPIFeatures = prefs("protectedAPIFeatures");
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if (
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functionStatus.active &&
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(
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!protectedAPIFeatures.hasOwnProperty(name) ||
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protectedAPIFeatures[name]
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)
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){
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switch (functionStatus.mode){
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case "ask": case "block": case "fake":
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descriptor.value = changedGetter.valueGenerator({
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mode: functionStatus.mode,
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original: descriptor.value,
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notify: function notifyCallback(messageId){
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notify({
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url: getURL(window),
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errorStack: (new Error()).stack,
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messageId,
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timestamp: new Date(),
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functionName: name,
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api: changedGetter.api
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});
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}
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});
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Object.defineProperty(object, name, descriptor);
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break;
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}
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}
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}
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else {
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logging.error("Try to fake non getter property:", changedGetter);
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}
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}
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});
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}
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});
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}
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};
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}()); |