New version: touch screen details

README.md

@@ -107,11 +107,11 @@ python -m SimpleHTTPServer
 17. WebGL fingerprinting
 18. Plugins (IE included)
 19. Is AdBlock installed or not
-20. Has the user tampered with its languages 
+20. Has the user tampered with its languages
 21. Has the user tampered with its screen resolution
 22. Has the user tampered with its OS
 23. Has the user tampered with its browser
-
+24. Touch screen detection and capabilities
 
 
 ### Many more fingerprinting sources will be implemented, such as
@@ -121,10 +121,8 @@ python -m SimpleHTTPServer
 * Flash linux kernel version,
 * Internal HashTable implementation detection
 * WebRTC fingerprinting
-* Touch screen implementation fingerprinting
 * Many more
 
-
 #### To recompile the FontList.swf file:
 
 * Download Adobe Flex SDK from:  http://www.adobe.com/devnet/flex/flex-sdk-download.html

fingerprint2.js

@@ -1,5 +1,5 @@
 /*
-* Fingerprintjs2 0.3.0 - Modern & flexible browser fingerprint library v2
+* Fingerprintjs2 0.4.0 - Modern & flexible browser fingerprint library v2
 * https://github.com/Valve/fingerprintjs2
 * Copyright (c) 2015 Valentin Vasilyev ([email protected])
 * Licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) license.
@@ -101,6 +101,7 @@
       keys = this.hasLiedResolutionKey(keys);
       keys = this.hasLiedOsKey(keys);
       keys = this.hasLiedBrowserKey(keys);
+      keys = this.touchSupportKey(keys);
       var that = this;
       this.fontsKey(keys, function(newKeys){
         var murmur = that.x64hash128(newKeys.join("~~~"), 31);
@@ -429,6 +430,12 @@
         return "";
       }
     },
+    touchSupportKey: function (keys) {
+      if(!this.options.excludeTouchSupport){
+        keys.push(this.getTouchSupport());
+      }
+      return keys;
+    },
     hasSessionStorage: function () {
       try {
         return !!window.sessionStorage;
@@ -468,6 +475,30 @@
         return "doNotTrack: unknown";
       }
     },
+    // This is a crude and primitive touch screen detection.
+    // It's not possible to currently reliably detect the  availability of a touch screen
+    // with a JS, without actually subscribing to a touch event.
+    // http://www.stucox.com/blog/you-cant-detect-a-touchscreen/
+    // https://github.com/Modernizr/Modernizr/issues/548
+    // method returns an array of 3 values:
+    // maxTouchPoints, the success or failure of creating a TouchEvent,
+    // and the availability of the 'ontouchstart' property
+    getTouchSupport: function () {
+      var maxTouchPoints = 0;
+      var touchEvent = false;
+      if(typeof navigator.maxTouchPoints !== "undefined") {
+        maxTouchPoints = navigator.maxTouchPoints;
+      } else if (typeof navigator.msMaxTouchPoints !== "undefined") {
+        maxTouchPoints = navigator.msMaxTouchPoints;
+      }
+      try {
+        document.createEvent("TouchEvent");
+        touchEvent = true;
+      } catch(_) { /* squelch */ }
+      var touchStart = "ontouchstart" in window;
+      return [maxTouchPoints, touchEvent, touchStart];
+    },
+    // https://www.browserleaks.com/canvas#how-does-it-work
     getCanvasFp: function() {
       var result = [];
       // Very simple now, need to make it more complex (geo shapes etc)
@@ -484,6 +515,10 @@
         ctx.globalCompositeOperation = "screen";
       } catch (e) { /* squelch */ }
       result.push("canvas blending:" + ((ctx.globalCompositeOperation === "screen") ? "yes" : "no"));
+
+      // detect browser support of canvas winding
+      // http://blogs.adobe.com/webplatform/2013/01/30/winding-rules-in-canvas/
+      // https://github.com/Modernizr/Modernizr/blob/master/feature-detects/canvas/winding.js
       ctx.rect(0, 0, 10, 10);
       ctx.rect(2, 2, 6, 6);
       result.push("canvas winding:" + ((ctx.isPointInPath(5, 5, "evenodd") === false) ? "yes" : "no"));

package.json

@@ -1,6 +1,6 @@
 {
   "name": "fingerprintjs2",
-  "version": "0.3.0",
+  "version": "0.4.0",
   "description": "Modern & flexible browser fingerprinting library",
   "main": "fingerprint2.js",
   "dependencies": {