1
0
mirror of https://github.com/kkapsner/CanvasBlocker synced 2024-12-23 05:10:27 +01:00
CanvasBlocker/test/iframeTest.js

101 lines
2.2 KiB
JavaScript
Raw Permalink Normal View History

2019-05-24 18:31:11 +02:00
var log = function(){
"use strict";
return function log(...str){
// eslint-disable-next-line no-console
console.log(...str);
};
}();
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
var ctx = 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("");
});
}
function compare(string1, string2, alwaysOutputHashes){
"use strict";
function outputHashes(message){
Promise.all([
hash(string1),
hash(string2)
]).then(function(hashes){
// eslint-disable-next-line no-console
console.log(message, ...hashes);
});
}
if (string1 === string2){
if (alwaysOutputHashes){
outputHashes("Matching hashes:");
}
return "match";
}
else {
outputHashes("Hashes that differ:");
if (string1.length === string2.length){
let i;
for (i = 0; i < string1.length; i += 1){
if (string1.charAt(i) !== string2.charAt(i)){
break;
}
}
return "missmatch (first at " + i + ")";
}
else {
let i;
for (i = 0; i < Math.min(string1.length, string2.length); i += 1){
if (string1.charAt(i) !== string2.charAt(i)){
break;
}
}
return "missmatch (different lengths, first at " + i + ")";
}
}
}
var reference = test(window);
hash(reference).then(function(hash){
"use strict";
log("reference hash:", hash);
});