mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-11-01 02:48:44 +01:00
75 lines
2.3 KiB
PHP
75 lines
2.3 KiB
PHP
<!DOCTYPE html>
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<html>
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<head>
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<title>Test</title>
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<script>
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console.log(new Date(), "starting first fingerprint");
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function fingerPrint(){
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"use strict";var canvas = document.createElement("canvas");
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canvas.setAttribute("width", 220);
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canvas.setAttribute("height", 30);
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var fp_text = "BrowserLeaks,com <canvas> 10";
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var ctx = canvas.getContext("2d");
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ctx.textBaseline = "top";
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ctx.font = "14px 'Arial'";
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ctx.textBaseline = "alphabetic";
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ctx.fillStyle = "#f60";
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ctx.fillRect(125, 1, 62, 20);
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ctx.fillStyle = "#069";
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ctx.fillText(fp_text, 2, 15);
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ctx.fillStyle = "rgba(102, 204, 0, 07)";
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ctx.fillText(fp_text, 4, 17);
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return canvas.toDataURL();
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}
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function hash(url){
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var buffer = new TextEncoder("utf-8").encode(url);
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return crypto.subtle.digest("SHA-256", buffer).then(function(hash){
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var chunks = [];
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(new Uint32Array(hash)).forEach(function(num){
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chunks.push(num.toString(16));
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});
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return chunks.map(function(chunk){
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return "0".repeat(8 - chunk.length) + chunk;
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}).join("");
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});
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}
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try {
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var firstFingerprint = fingerPrint();
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}
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catch (e){
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console.log(new Date(), e);
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var firstFingerprint = false;
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}
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</script>
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</head>
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<body>
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<script>
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if (firstFingerprint){
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document.body.textContent = "context API not blocked";
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window.setTimeout(function(){
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console.log(new Date(), "starting second fingerprint");
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document.body.appendChild(document.createElement("br"));
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var secondFingerprint = fingerPrint();
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if (firstFingerprint === secondFingerprint){
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hash(firstFingerprint).then(function(hash){
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document.body.appendChild(document.createTextNode("fingerprint consistent (" + hash + ") -> good!"));
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document.body.style.backgroundColor = "green";
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});
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}
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else {
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Promise.all([hash(firstFingerprint), hash(secondFingerprint)]).then(function(hashes){
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document.body.appendChild(document.createTextNode("fingerprint not consistent (" + hashes[0] + " != " + hashes[1] + ") -> very bad! (potential fingerprint leak)"));
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document.body.style.backgroundColor = "red";
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});
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}
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}, 500);
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}
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else {
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document.body.textContent = "context API blocked";
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document.body.style.backgroundColor = "orange";
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}
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</script>
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</body></html> |