mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-12-22 12:50:36 +01:00
363 lines
10 KiB
JavaScript
363 lines
10 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("./modifiedDOMRectAPI", {});
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}
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const extension = require("./extension");
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const {checkerWrapper, setProperties, getStatusByFlag} = require("./modifiedAPIFunctions");
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const {byteArrayToString: hash} = require("./hash");
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let randomSupply = null;
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scope.setRandomSupply = function(supply){
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randomSupply = supply;
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};
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function getHash(domRect){
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return hash(new Float64Array([domRect.x, domRect.y, domRect.width, domRect.height]));
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}
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function getValueHash(value){
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return hash(new Float32Array([value]));
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}
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const registeredRects = new WeakMap();
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function registerDOMRect(domRect, notify, window, prefs){
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registeredRects.set(extension.getWrapped(domRect), {
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notify: function(){
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let done = false;
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return function(message){
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if (!done){
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done = true;
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notify(message);
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}
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};
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}(),
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window,
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prefs
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});
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}
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function getDOMRectRegistration(domRect){
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return registeredRects.get(extension.getWrapped(domRect));
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}
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const cache = {};
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const valueCache = [{}, {}, {}, {}, {}, {}, {}];
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scope.cache = {
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valueCache,
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X: 0,
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Y: 1,
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WIDTH: 2,
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HEIGHT: 3,
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OTHER: 4,
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Z: 5,
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W: 6,
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};
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function getFakeValue(value, i, {window, prefs, rng}){
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const valueHash = getValueHash(value);
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const cache = valueCache[i];
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let cachedValue = cache[valueHash];
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if (typeof cachedValue === "number"){
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return cachedValue;
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}
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if ((value * prefs("domRectIntegerFactor", window.location)) % 1 === 0){
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cache[valueHash] = value;
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return value;
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}
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else {
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const fakedValue = value + 0.01 * (rng(i) / 0xffffffff - 0.5);
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const fakedHash = getValueHash(fakedValue);
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cache[valueHash] = fakedValue;
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cache[fakedHash] = fakedValue;
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return fakedValue;
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}
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}
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scope.getFakeValue = getFakeValue;
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function getFakeDomRect(window, domRect, prefs, notify){
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const hash = getHash(domRect);
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let cached = cache[hash];
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if (!cached){
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notify("fakedDOMRectReadout");
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const rng = randomSupply.getRng(4, window);
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const env = {window, prefs, rng};
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cached = new (domRect instanceof window.SVGRect? window.DOMRectReadOnly: domRect.constructor)(
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getFakeValue(domRect.x, 0, env),
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getFakeValue(domRect.y, 1, env),
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getFakeValue(domRect.width, 2, env),
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getFakeValue(domRect.height, 3, env)
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);
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cache[hash] = cached;
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cache[getHash(cached)] = cached;
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}
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return cached;
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}
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function getFakeDOMPoint(window, domPoint, prefs){
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const env = {window, prefs, rng: randomSupply.getRng(7, window)};
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return new domPoint.constructor(
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getFakeValue(domPoint.x, 0, env),
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getFakeValue(domPoint.y, 1, env),
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getFakeValue(domPoint.z, 5, env),
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getFakeValue(domPoint.w, 6, env)
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);
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}
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function getFakeSVGPoint(window, svgPoint, prefs){
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const env = {window, prefs, rng: randomSupply.getRng(2, window)};
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svgPoint.x = getFakeValue(svgPoint.x, 0, env);
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svgPoint.y = getFakeValue(svgPoint.y, 1, env);
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return svgPoint;
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}
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function getFakeDOMQuad(window, domQuad, prefs, notify){
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notify("fakedDOMRectReadout");
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return new domQuad.constructor(
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getFakeDOMPoint(window, domQuad.p1, prefs),
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getFakeDOMPoint(window, domQuad.p2, prefs),
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getFakeDOMPoint(window, domQuad.p3, prefs),
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getFakeDOMPoint(window, domQuad.p4, prefs)
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);
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}
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function registerCallback(args, check){
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const {prefs, notify, window, original} = check;
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const originalValue = args.length?
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original.call(this, ...args):
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original.call(this);
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registerDOMRect(originalValue, notify, window, prefs);
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return originalValue;
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}
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function fakePointCallback(args, check){
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const {prefs, notify, window, original} = check;
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const ret = args.length? original.call(this, ...args): original.call(this);
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notify("fakedDOMRectReadout");
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if (ret instanceof window.SVGPoint){
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return getFakeSVGPoint(window, ret, prefs);
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}
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else {
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return getFakeDOMPoint(window, ret, prefs);
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}
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}
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scope.changedFunctions = {
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getClientRects: {
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object: ["Range", "Element"],
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fakeGenerator: function(checker){
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return function getClientRects(){
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return checkerWrapper(checker, this, arguments, function(args, check){
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const {prefs, notify, window, original} = check;
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const ret = args.length? original.call(this, ...args): original.call(this);
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for (let i = 0; i < ret.length; i += 1){
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registerDOMRect(ret[i], notify, window, prefs);
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}
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return ret;
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});
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};
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}
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},
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getBoundingClientRect: {
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object: ["Range", "Element"],
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fakeGenerator: function(checker){
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return function getBoundingClientRect(){
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return checkerWrapper(checker, this, arguments, registerCallback);
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};
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}
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},
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getBoxQuads: {
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object: ["Document", "Element", "Text", "CSSPseudoElement"],
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fakeGenerator: function(checker){
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return function getBoxQuads(){
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return checkerWrapper(checker, this, arguments, function(args, check){
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const {prefs, notify, window, original} = check;
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const ret = args.length? original.call(this, ...args): original.call(this);
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for (let i = 0; i < ret.length; i += 1){
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ret[i] = getFakeDOMQuad(window, ret[i], prefs, notify);
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}
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return ret;
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});
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};
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}
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},
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// It seems only getBoxQuads creates a DOMQuad and this method is behind a flag.
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// So the only way to create one is manually by the constructor and then no fingerprinting is possible.
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// getBounds: {
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// object: ["DOMQuad"],
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// fakeGenerator: function(checker){
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// return function getBounds(){
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// return checkerWrapper(checker, this, arguments, registerCallback);
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// };
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// }
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// },
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getBBox: {
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object: ["SVGGraphicsElement"],
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fakeGenerator: function(checker){
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return function getBBox(){
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return checkerWrapper(checker, this, arguments, registerCallback);
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};
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}
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},
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getStartPositionOfChar: {
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object: ["SVGTextContentElement"],
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fakeGenerator: function(checker){
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return function getStartOfChar(){
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return checkerWrapper(checker, this, arguments, fakePointCallback);
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};
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}
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},
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getEndPositionOfChar: {
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object: ["SVGTextContentElement"],
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fakeGenerator: function(checker){
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return function getEndOfChar(){
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return checkerWrapper(checker, this, arguments, fakePointCallback);
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};
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}
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},
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getExtentOfChar: {
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object: ["SVGTextContentElement"],
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fakeGenerator: function(checker){
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return function getExtentOfChar(){
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return checkerWrapper(checker, this, arguments, registerCallback);
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};
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}
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},
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getPointAtLength: {
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object: ["SVGGeometryElement", "SVGPathElement"],
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fakeGenerator: function(checker){
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return function getPointAtLength(){
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return checkerWrapper(checker, this, arguments, fakePointCallback);
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};
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}
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},
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};
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function generateChangedDOMRectPropertyGetter(property, readonly = false){
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const changedGetter = {
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objectGetters: readonly?
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[
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function(window){return window.DOMRectReadOnly && window.DOMRectReadOnly.prototype;}
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]:
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[
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function(window){return window.DOMRect && window.DOMRect.prototype;},
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function(window){return window.SVGRect && window.SVGRect.prototype;},
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function(window){return window.DOMRectReadOnly && window.DOMRectReadOnly.prototype;}
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],
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name: property,
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getterGenerator: function(){
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const temp = {
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get [property](){
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const registration = getDOMRectRegistration(this);
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if (registration){
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return getFakeDomRect(
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registration.window,
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this,
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registration.prefs,
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registration.notify
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)[property];
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}
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return this[property];
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}
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};
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return Object.getOwnPropertyDescriptor(temp, property).get;
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}
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};
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if (!readonly){
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changedGetter.setterGenerator = function(window, original, prefs){
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const temp = {
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set [property](newValue){
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const registration = getDOMRectRegistration(this);
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if (registration){
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const fakeDomRect = getFakeDomRect(window, this, prefs, registration.notify);
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registeredRects.delete(extension.getWrapped(this));
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["x", "y", "width", "height"].forEach((prop) => {
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if (prop === property){
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this[prop] = newValue;
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}
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else {
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this[prop] = fakeDomRect[prop];
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}
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});
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}
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else {
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original.call(this, ...arguments);
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}
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}
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};
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return Object.getOwnPropertyDescriptor(temp, property).set;
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};
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}
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return changedGetter;
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}
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scope.changedGetters = [
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generateChangedDOMRectPropertyGetter("x", false),
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generateChangedDOMRectPropertyGetter("y", false),
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generateChangedDOMRectPropertyGetter("width", false),
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generateChangedDOMRectPropertyGetter("height", false),
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generateChangedDOMRectPropertyGetter("left", true),
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generateChangedDOMRectPropertyGetter("right", true),
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generateChangedDOMRectPropertyGetter("top", true),
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generateChangedDOMRectPropertyGetter("bottom", true),
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{
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objectGetters: [
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function(window){
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return window.IntersectionObserverEntry && window.IntersectionObserverEntry.prototype;
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}
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],
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name: "intersectionRect",
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getterGenerator: function(checker){
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const temp = {
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get intersectionRect(){
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return checkerWrapper(checker, this, arguments, registerCallback);
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}
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};
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return Object.getOwnPropertyDescriptor(temp, "intersectionRect").get;
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}
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},
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{
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objectGetters: [
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function(window){
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return window.IntersectionObserverEntry && window.IntersectionObserverEntry.prototype;
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}
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],
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name: "boundingClientRect",
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getterGenerator: function(checker){
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const temp = {
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get boundingClientRect(){
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return checkerWrapper(checker, this, arguments, registerCallback);
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}
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};
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return Object.getOwnPropertyDescriptor(temp, "boundingClientRect").get;
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}
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},
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{
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objectGetters: [
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function(window){
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return window.IntersectionObserverEntry && window.IntersectionObserverEntry.prototype;
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}
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],
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name: "rootBounds",
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getterGenerator: function(checker){
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const temp = {
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get rootBounds(){
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return checkerWrapper(checker, this, arguments, registerCallback);
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}
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};
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return Object.getOwnPropertyDescriptor(temp, "rootBounds").get;
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}
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}
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];
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setProperties(scope.changedFunctions, scope.changedGetters, {
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type: "readout",
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getStatus: getStatusByFlag("protectDOMRect"),
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api: "domRect"
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});
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}()); |