security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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mirror of https://github.com/kkapsner/CanvasBlocker synced 2025-07-04 12:36:37 +02:00
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Removed pageMod and many not needed features.

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kkapsner 2015-09-06 12:26:50 +02:00
parent 195d780bf8
commit 97e0c6b9cd
8 changed files with 348 additions and 661 deletions
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lib/modifiedAPI.js Normal file
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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";
function getFakeCanvas(window, original){
var canvas = original.cloneNode(true);
var context = window.HTMLCanvasElement.prototype.getContext.call(canvas, "2d");
var imageData = window.CanvasRenderingContext2D.prototype.getImageData.call(context, 0, 0, canvas.width, canvas.height);
var data = imageData.data;
for (var i = 0, l = data.length; i < l; i += 1){
var value = 0xFF - data[i];
if (value > 0x80){
value = value ^ Math.floor(Math.random() * 0x40);
}
else if (value > 0x40){
value = value ^ Math.floor(Math.random() * 0x20);
}
else if (value > 0x20){
value = value ^ Math.floor(Math.random() * 0x10);
}
else if (value > 0x10){
value = value ^ Math.floor(Math.random() * 0x08);
}
else if (value > 0x08){
value = value ^ Math.floor(Math.random() * 0x04);
}
else if (value > 0x04){
value = value ^ Math.floor(Math.random() * 0x02);
}
else if (value > 0x02){
value = value ^ Math.floor(Math.random() * 0x01);
}
data[i] = 0xFF - value;
}
context.putImageData(imageData, 0, 0);
return canvas;
}
function getWindow(canvas){
console.log(canvas);
return canvas.ownerDocument.defaultView;
}
// changed functions and their fakes
exports.changedFunctions = {
getContext: {
mode: "block",
object: "HTMLCanvasElement"
},
toDataURL: {
mode: "fakeReadout",
object: "HTMLCanvasElement",
fake: function toDataURL(){
var window = getWindow(this);
return window.HTMLCanvasElement.prototype.toDataURL.apply(getFakeCanvas(window, this), arguments);
}
},
toBlob: {
mode: "fakeReadout",
object: "HTMLCanvasElement",
fake: function toBlob(callback){
var window = getWindow(this);
return window.HTMLCanvasElement.prototype.toBlob.apply(getFakeCanvas(window, this), arguments);
},
exportOptions: {allowCallbacks: true}
},
mozGetAsFile: {
mode: "fakeReadout",
object: "HTMLCanvasElement",
mozGetAsFile: function mozGetAsFile(callbak){
var window = getWindow(this);
return window.HTMLCanvasElement.prototype.mozGetAsFile.apply(getFakeCanvas(window, this), arguments);
}
},
getImageData: {
mode: "fakeReadout",
object: "CanvasRenderingContext2D",
fake: function getImageData(sx, sy, sw, sh){
var window = getWindow(this.canvas);
var context = window.HTMLCanvasElement.prototype.getContext.call(getFakeCanvas(window, this.canvas), "2d");
var data = window.CanvasRenderingContext2D.prototype.getImageData.apply(context, arguments).data;
var imageData = new window.wrappedJSObject.ImageData(sw, sh);
for (var i = 0, l = data.length; i < l; i += 1){
imageData.data[i] = data[i];
}
return imageData;
}
},
readPixels: {
mode: "fakeReadout",
object: "WebGLRenderingContext",
fake: function readPixels(x, y, width, height, format, type, pixels){
var window = getWindow(this.canvas);
var context = window.HTMLCanvasElement.prototype.getContext.call(getFakeCanvas(window, this.canvas), "webGL");
return window.WebGLRenderingContext.prototype.readPixels.apply(context, arguments);
}
}
};
}());