mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-12-22 12:50:36 +01:00
106 lines
2.8 KiB
HTML
106 lines
2.8 KiB
HTML
<html>
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<body>
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<div id="log"></div>
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<form id="form" method="POST" action="http://localhost/server/POST-echo.php">
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<input name="internalId" value="id to be used to link the requests">
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<textarea style="display: block;" name="fingerprint"></textarea>
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<button>submit</button>
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</form>
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<script>
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const origin = "iframe";
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function draw(canvas){
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"use strict";
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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 ctx;
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}
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function topTest(){
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"use strict";
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// create window canvas
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var canvas = document.createElement("canvas");
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// draw image in window canvas
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var ctx = draw(canvas);
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return {
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imageData: ctx.getImageData(0, 0, canvas.width, canvas.height),
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url: canvas.toDataURL(),
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isPointInPath: getIsPointInPath(ctx)
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};
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}
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function getIsPointInPath(ctx){
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"use strict";
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ctx.beginPath();
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ctx.moveTo(20, 19);
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ctx.lineTo(40, 19);
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ctx.lineTo(30, 30);
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ctx.closePath();
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ctx.stroke();
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return ctx.isPointInPath(30, 19);
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};
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function hashToString(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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function send(form, {url, imageData, isPointInPath}){
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var buffer = new TextEncoder("utf-8").encode(url);
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Promise.all([
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crypto.subtle.digest("SHA-256", buffer),
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crypto.subtle.digest("SHA-256", imageData.data)
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]).then(function(hashes){
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var data = JSON.stringify({
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urlHash: hashToString(hashes[0]),
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imageDataHash: hashToString(hashes[1]),
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isPointInPath
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}, null, "\t");
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form.fingerprint.value = data;
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var xhr = new XMLHttpRequest();
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xhr.open("POST", form.action, true);
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xhr.onreadystatechange = function(){
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if (this.readyState === 4){
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const status = this.status;
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if (status === 200 || status === 304) {
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console.log("Sending xhr successful from", origin, ":", data);
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}
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else {
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console.log("Sending xhr failed:", this);
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}
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}
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};
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xhr.send(new FormData(form));
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window.setTimeout(function(){
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form.submit();
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window.setTimeout(function(){
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document.getElementById("log").textContent = "You see the real canvas fingerprint, but it cannot leak from this iFrame.";
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},
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250
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);
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}, 1000);
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});
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}
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send(document.getElementById("form"), topTest());
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</script>
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</body>
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</html> |