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CanvasBlocker/test/dataUrlTest.php

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<!DOCTYPE html>
<html>
<head>
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<title>Data-URL Test</title>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link href="testIcon.svg" type="image/png" rel="icon">
<link href="testIcon.svg" type="image/png" rel="shortcut icon">
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<link rel="stylesheet" href="../default.css" type="text/css">
<style>
iframe, object, embed {
display: block;
box-sizing: border-box;
width: 100%;
height: 7em;
}
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#code {
font-size: 70%;
}
</style>
<link rel="stylesheet" href="data:text/css;base64,Ym9keXtiYWNrZ3JvdW5kLWNvbG9yOiNlMGZmZTA7fQ==">
</head>
<body>
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<h1>Data-URL test</h1>
This test might not work properly if any other addon is installed that changes the CSP headers (e.g. NoScript or uBlock Origin).
<h2>Expected result</h2>
<ul>
<li>the "Normal" and "blob" iFrames show faked hashes</li>
<li>the "Data-URL" iFrame, object and embed shows nothing</li>
<li>the whole page has a green background</li>
</ul>
<h2>Tests</h2>
<h3>Normal iFrame</h3>
<iframe src="sendFingerprintTest.html"></iframe>
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<h3>Data-URL iFrame</h3>
<iframe id="iframe" src="data:text/html;base64&#x2c;<?php
echo base64_encode(
str_replace(
'const origin = "iframe";',
'const origin = "data URL iframe";',
file_get_contents("sendFingerprintTest.html")
)
);
?>"></iframe>
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<h3>blob iFrame</h3>
<iframe id="blobIframe"></iframe>
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<h3>Data-URL object</h3>
<object
type="text/html"
data="data:text/html;base64&#x2c;<?php
echo base64_encode(
str_replace(
'const origin = "iframe";',
'const origin = "data URL object";',
file_get_contents("sendFingerprintTest.html")
)
);
?>"
></object>
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<h3>Data-URL embed</h3>
<embed
type="text/html"
src="data:text/html;base64&#x2c;<?php
echo base64_encode(
str_replace(
'const origin = "iframe";',
'const origin = "data URL embed";',
file_get_contents("sendFingerprintTest.html")
)
);
?>"
></embed>
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<h3>iFrame code</h3>
<pre id="code"></pre>
<script src="dataUrlTest.js"></script>
<div id="log"></div>
<form id="form" method="POST" action="https://bounce.kkapsner.de/requestDetails.php"">
<input name="internalId" value="id to be used to link the requests">
<textarea style="display: block;" name="fingerprint"></textarea>
<button>submit</button>
</form>
<script>
function draw(canvas){
"use strict";
canvas.setAttribute("width", 220);
canvas.setAttribute("height", 30);
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const fp_text = "BrowserLeaks,com <canvas> 10";
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const ctx = canvas.getContext("2d");
ctx.textBaseline = "top";
ctx.font = "14px 'Arial'";
ctx.textBaseline = "alphabetic";
ctx.fillStyle = "#f60";
ctx.fillRect(125, 1, 62, 20);
ctx.fillStyle = "#069";
ctx.fillText(fp_text, 2, 15);
ctx.fillStyle = "rgba(102, 204, 0, 07)";
ctx.fillText(fp_text, 4, 17);
return ctx;
}
function topTest(){
"use strict";
// create window canvas
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const canvas = document.createElement("canvas");
// draw image in window canvas
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const ctx = draw(canvas);
return {
imageData: ctx.getImageData(0, 0, canvas.width, canvas.height),
url: canvas.toDataURL(),
isPointInPath: getIsPointInPath(ctx)
};
}
function getIsPointInPath(ctx){
"use strict";
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ctx.beginPath();
ctx.moveTo(20, 19);
ctx.lineTo(40, 19);
ctx.lineTo(30, 30);
ctx.closePath();
ctx.stroke();
return ctx.isPointInPath(30, 19);
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}
function hashToString(hash){
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"use strict";
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const chunks = [];
(new Uint32Array(hash)).forEach(function(num){
chunks.push(num.toString(16));
});
return chunks.map(function(chunk){
return "0".repeat(8 - chunk.length) + chunk;
}).join("");
}
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const send = function(){
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"use strict";
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return async function send(form, {url, imageData, isPointInPath}){
const buffer = new TextEncoder("utf-8").encode(url);
const hashes = await Promise.all([
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crypto.subtle.digest("SHA-256", buffer),
crypto.subtle.digest("SHA-256", imageData.data)
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]);
const data = JSON.stringify({
urlHash: hashToString(hashes[0]),
imageDataHash: hashToString(hashes[1]),
isPointInPath
}, null, "\t");
form.fingerprint.value = data;
const xhr = new XMLHttpRequest();
xhr.open("POST", form.action + "?main", true);
xhr.onreadystatechange = function(){
if (this.readyState === 4){
const status = this.status;
if (status === 200 || status === 304) {
console.log("Sending xhr successful from main page:", data);
}
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else {
console.log("Sending xhr failed:", this);
}
}
};
xhr.send(new FormData(form));
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};
}();
send(document.getElementById("form"), topTest());
</script>
</body></html>