mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-06-10 07:09:49 +02:00
71 lines
1.6 KiB
JavaScript
71 lines
1.6 KiB
JavaScript
|
|
||
|
function draw(canvas){
|
||
|
"use strict";
|
||
|
|
||
|
canvas.setAttribute("width", 220);
|
||
|
canvas.setAttribute("height", 30);
|
||
|
|
||
|
var fp_text = "BrowserLeaks,com <canvas> 10";
|
||
|
|
||
|
var 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 test(window){
|
||
|
"use strict";
|
||
|
|
||
|
// create window canvas
|
||
|
var canvas = document.createElement("canvas");
|
||
|
// draw image in window canvas
|
||
|
draw(canvas);
|
||
|
return window.HTMLCanvasElement.prototype.toDataURL.call(canvas);
|
||
|
}
|
||
|
function hash(string){
|
||
|
"use strict";
|
||
|
|
||
|
var buffer = new TextEncoder("utf-8").encode(string);
|
||
|
return crypto.subtle.digest("SHA-256", buffer).then(function(hash){
|
||
|
var 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("");
|
||
|
});
|
||
|
|
||
|
}
|
||
|
|
||
|
var addLine = function(){
|
||
|
"use strict";
|
||
|
|
||
|
var output = document.getElementById("results");
|
||
|
return function(text){
|
||
|
var line = document.createElement("div");
|
||
|
line.textContent = text;
|
||
|
output.appendChild(line);
|
||
|
};
|
||
|
}();
|
||
|
|
||
|
addLine("window name at start: " + window.name);
|
||
|
window.name = "CanvasBlocker CSP test";
|
||
|
addLine("window name after set: " + window.name);
|
||
|
hash(test(window)).then(function(hash){
|
||
|
"use strict";
|
||
|
|
||
|
addLine("canvas hash: " + hash);
|
||
|
return;
|
||
|
}).catch(function(error){
|
||
|
"use strict";
|
||
|
|
||
|
addLine("error while creating canvas hash: " + error);
|
||
|
});
|