mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-12-23 05:10:27 +01:00
94 lines
2.9 KiB
JavaScript
94 lines
2.9 KiB
JavaScript
/* eslint no-console: off */
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(function(){
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"use strict";
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function show(container, url){
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container.querySelector(".display").src = url;
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var buffer = new TextEncoder("utf-8").encode(url);
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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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container.querySelector(".hash").textContent = 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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if (location.search !== "?notInitial"){
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try {show(document.getElementById("top"), topTest());}
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catch (e){console.error(e);}
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try {show(document.getElementById("iframe"), iframeTest(document.querySelector("#iframe iframe")));}
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catch (e){console.error(e);}
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try {show(document.getElementById("iframe2"), iframeTest(document.querySelector("#iframe2 iframe")));}
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catch (e){console.error(e);}
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try {show(document.getElementById("iframe3"), iframeTest(document.querySelector("#iframe3 iframe")));}
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catch (e){console.error(e);}
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}
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document.querySelector("#top button").addEventListener("click", function(){
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show(document.getElementById("top"), topTest());
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});
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document.querySelector("#iframe button").addEventListener("click", function(){
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show(document.getElementById("iframe"), iframeTest(document.querySelector("#iframe iframe")));
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});
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document.querySelector("#iframe2 button").addEventListener("click", function(){
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show(document.getElementById("iframe2"), iframeTest(document.querySelector("#iframe2 iframe")));
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});
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document.querySelector("#iframe3 button").addEventListener("click", function(){
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show(document.getElementById("iframe3"), iframeTest(document.querySelector("#iframe3 iframe")));
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});
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}());
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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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draw(canvas);
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return canvas.toDataURL();
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}
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function iframeTest(iframe){
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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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draw(canvas);
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// create iframe canvas and ctx
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var iframe_canvas = iframe.contentDocument.createElement("canvas");
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iframe_canvas.setAttribute("width", 220);
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iframe_canvas.setAttribute("height", 30);
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var iframe_ctx = iframe_canvas.getContext("2d");
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// copy image from window canvas to iframe ctx
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iframe_ctx.drawImage(canvas, 0, 0);
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return iframe_canvas.toDataURL();
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} |