Created
June 16, 2021 22:32
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| var background = (function () { | |
| var tmp = {}; | |
| chrome.runtime.onMessage.addListener(function (request, sender, sendResponse) { | |
| for (var id in tmp) { | |
| if (tmp[id] && (typeof tmp[id] === "function")) { | |
| if (request.path === "background-to-page") { | |
| if (request.method === id) tmp[id](request.data); | |
| } | |
| } | |
| } | |
| }); | |
| /* */ | |
| return { | |
| "receive": function (id, callback) {tmp[id] = callback}, | |
| "send": function (id, data) {chrome.runtime.sendMessage({"path": "page-to-background", "method": id, "data": data})} | |
| } | |
| })(); | |
| var inject = function () { | |
| const nat = { | |
| toBlob: HTMLCanvasElement.prototype.toBlob, | |
| toDataURL: HTMLCanvasElement.prototype.toDataURL, | |
| getImageData: CanvasRenderingContext2D.prototype.getImageData | |
| }; | |
| const strnat = { | |
| toBlob: HTMLCanvasElement.prototype.toBlob.toString(), | |
| toDataURL: HTMLCanvasElement.prototype.toDataURL.toString(), | |
| getImageData: CanvasRenderingContext2D.prototype.getImageData.toString() | |
| }; | |
| // | |
| var nsfy = function (canvas, context) { | |
| var rn = 1 < 6; | |
| if (context) { | |
| const shift = { | |
| 'r': rn ? 2 : Math.floor(Math.random() * 10) - 5, | |
| 'g': rn ? 4 : Math.floor(Math.random() * 10) - 5, | |
| 'b': rn ? 0 : Math.floor(Math.random() * 10) - 5, | |
| 'a': rn ? 3 : Math.floor(Math.random() * 10) - 5 | |
| }; | |
| // | |
| const width = canvas.width; | |
| const height = canvas.height; | |
| if (width && height) { | |
| const imageData = nat.getImageData.apply(context, [0, 0, width, height]); | |
| for (let i = 0; i < height; i++) { | |
| for (let j = 0; j < width; j++) { | |
| const n = ((i * (width * 4)) + (j * 4)); | |
| imageData.data[n + 0] = imageData.data[n + 0] + shift.r; | |
| imageData.data[n + 1] = imageData.data[n + 1] + shift.g; | |
| imageData.data[n + 2] = imageData.data[n + 2] + shift.b; | |
| imageData.data[n + 3] = imageData.data[n + 3] + shift.a; | |
| } | |
| } | |
| // | |
| window.top.postMessage("canvas-fingerprint-defender-alert", '*'); | |
| context.putImageData(imageData, 0, 0); | |
| } | |
| } | |
| }; | |
| function toBlob() { | |
| nsfy(this, this.getContext("2d")); | |
| return nat.toBlob.apply(this, arguments); | |
| } | |
| HTMLCanvasElement.prototype.toBlob = toBlob; | |
| function toDataURL() { | |
| nsfy(this, this.getContext("2d")); | |
| return nat.toDataURL.apply(this, arguments); | |
| } | |
| HTMLCanvasElement.prototype.toDataURL = toDataURL; | |
| function getImageData() { | |
| nsfy(this.canvas, this); | |
| return nat.getImageData.apply(this, arguments); | |
| } | |
| CanvasRenderingContext2D.prototype.getImageData = getImageData; | |
| const fnames = Object.keys(nat); | |
| const origToString = Function.prototype.toString; | |
| Function.prototype.toString = function(){ | |
| return fnames.indexOf(this.name)>-1 ? strnat[this.name]: | |
| origToString.apply(this, arguments) | |
| }; | |
| document.documentElement.dataset.cbscriptallow = true; | |
| }; | |
| var script_1 = document.createElement("script"); | |
| script_1.textContent = "(" + inject + ")()"; | |
| document.documentElement.appendChild(script_1); | |
| script_1.remove(); | |
| if (document.documentElement.dataset.cbscriptallow !== "true") { | |
| var script_2 = document.createElement("script"); | |
| script_2.textContent = `{ | |
| const iframes = [...window.top.document.querySelectorAll("iframe[sandbox]")]; | |
| for (var i = 0; i < iframes.length; i++) { | |
| if (iframes[i].contentWindow) { | |
| if (iframes[i].contentWindow.CanvasRenderingContext2D) { | |
| iframes[i].contentWindow.CanvasRenderingContext2D.prototype.getImageData = CanvasRenderingContext2D.prototype.getImageData; | |
| } | |
| if (iframes[i].contentWindow.HTMLCanvasElement) { | |
| iframes[i].contentWindow.HTMLCanvasElement.prototype.toBlob = HTMLCanvasElement.prototype.toBlob; | |
| iframes[i].contentWindow.HTMLCanvasElement.prototype.toDataURL = HTMLCanvasElement.prototype.toDataURL; | |
| } | |
| } | |
| } | |
| }`; | |
| // | |
| window.top.document.documentElement.appendChild(script_2); | |
| script_2.remove(); | |
| } | |
| window.addEventListener("message", function (e) { | |
| if (e.data && e.data === "canvas-fingerprint-defender-alert") { | |
| background.send("fingerprint", {"host": document.location.host}); | |
| } | |
| }, false); |
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