79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
const canvasAPI = {
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draw: function draw(canvas){
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"use strict";
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canvas.width = 220;
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canvas.height = 30;
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const fingerprintText = "BrowserLeaks,com <canvas> 10";
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const context = canvas.getContext("2d");
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context.textBaseline = "top";
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context.font = "14px 'Arial'";
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context.textBaseline = "alphabetic";
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context.fillStyle = "#f60";
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context.fillRect(125, 1, 62, 20);
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context.fillStyle = "#069";
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context.fillText(fingerprintText, 2, 15);
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context.fillStyle = "rgba(102, 204, 0, 0.7)";
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context.fillText(fingerprintText, 4, 17);
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return context;
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},
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getIsPointInPath: function getIsPointInPath(context){
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"use strict";
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context.beginPath();
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context.moveTo(20, 19);
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context.lineTo(40, 19);
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context.lineTo(30, 30);
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context.closePath();
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context.stroke();
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return context.isPointInPath(30, 19);
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},
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getFingerprintData: function getFingerprintData(canvas, context){
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"use strict";
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return {
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imageData: context.getImageData(0, 0, canvas.width, canvas.height),
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url: canvas.toDataURL(),
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isPointInPath: canvasAPI.getIsPointInPath(context)
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};
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},
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getFingerprintFromDifferentDocument: function getFingerprintFromDifferentDocument(otherDocument){
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"use strict";
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// create window canvas
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const canvas = document.createElement("canvas");
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// draw image in window canvas
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canvasAPI.draw(canvas);
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// create other canvas and context
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const otherCanvas = otherDocument.createElement("canvas");
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otherCanvas.setAttribute("width", 220);
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otherCanvas.setAttribute("height", 30);
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const otherContext = otherCanvas.getContext("2d");
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// copy image from window canvas to iframe context
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otherContext.drawImage(canvas, 0, 0);
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return canvasAPI.getFingerprintData(otherCanvas, otherContext);
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},
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fingerprint: function fingerprint(windowToUse){
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"use strict";
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if (!windowToUse){
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windowToUse = window;
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}
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const canvas = document.createElement("canvas");
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const context = canvasAPI.draw(canvas);
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if (windowToUse !== window){
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return canvasAPI.getFingerprintFromDifferentDocument(windowToUse.document);
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}
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else {
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return this.getFingerprintData(canvas, context);
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}
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}
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}; |