core/util/browser.js

   1 /*
   2  * noVNC: HTML5 VNC client
   3  * Copyright (C) 2019 The noVNC Authors
   4  * Licensed under MPL 2.0 (see LICENSE.txt)
   5  *
   6  * See README.md for usage and integration instructions.
   7  */
   8
   9 import * as Log from './logging.js';
  10
  11 // Touch detection
  12 export let isTouchDevice = ('ontouchstart' in document.documentElement) ||
  13                                  // requried for Chrome debugger
  14                                  (document.ontouchstart !== undefined) ||
  15                                  // required for MS Surface
  16                                  (navigator.maxTouchPoints > 0) ||
  17                                  (navigator.msMaxTouchPoints > 0);
  18 window.addEventListener('touchstart', function onFirstTouch() {
  19     isTouchDevice = true;
  20     window.removeEventListener('touchstart', onFirstTouch, false);
  21 }, false);
  22
  23
  24 // The goal is to find a certain physical width, the devicePixelRatio
  25 // brings us a bit closer but is not optimal.
  26 export let dragThreshold = 10 * (window.devicePixelRatio || 1);
  27
  28 let _supportsCursorURIs = false;
  29
  30 try {
  31     const target = document.createElement('canvas');
  32     target.style.cursor = 'url("data:image/x-icon;base64,AAACAAEACAgAAAIAAgA4AQAAFgAAACgAAAAIAAAAEAAAAAEAIAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAD/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////AAAAAAAAAAAAAAAAAAAAAA==") 2 2, default';
  33
  34     if (target.style.cursor.indexOf("url") === 0) {
  35         Log.Info("Data URI scheme cursor supported");
  36         _supportsCursorURIs = true;
  37     } else {
  38         Log.Warn("Data URI scheme cursor not supported");
  39     }
  40 } catch (exc) {
  41     Log.Error("Data URI scheme cursor test exception: " + exc);
  42 }
  43
  44 export const supportsCursorURIs = _supportsCursorURIs;
  45
  46 let _supportsImageMetadata = false;
  47 try {
  48     new ImageData(new Uint8ClampedArray(4), 1, 1);
  49     _supportsImageMetadata = true;
  50 } catch (ex) {
  51     // ignore failure
  52 }
  53 export const supportsImageMetadata = _supportsImageMetadata;
  54
  55 export function isMac() {
  56     return navigator && !!(/mac/i).exec(navigator.platform);
  57 }
  58
  59 export function isWindows() {
  60     return navigator && !!(/win/i).exec(navigator.platform);
  61 }
  62
  63 export function isIOS() {
  64     return navigator &&
  65            (!!(/ipad/i).exec(navigator.platform) ||
  66             !!(/iphone/i).exec(navigator.platform) ||
  67             !!(/ipod/i).exec(navigator.platform));
  68 }
  69
  70 export function isAndroid() {
  71     return navigator && !!(/android/i).exec(navigator.userAgent);
  72 }
  73
  74 export function isSafari() {
  75     return navigator && (navigator.userAgent.indexOf('Safari') !== -1 &&
  76                          navigator.userAgent.indexOf('Chrome') === -1);
  77 }
  78
  79 export function isIE() {
  80     return navigator && !!(/trident/i).exec(navigator.userAgent);
  81 }
  82
  83 export function isEdge() {
  84     return navigator && !!(/edge/i).exec(navigator.userAgent);
  85 }
  86
  87 export function isFirefox() {
  88     return navigator && !!(/firefox/i).exec(navigator.userAgent);
  89 }
  90