https://www.hotelmanagement-network.com/wp-content/themes/goodlife…/js/detect-private-browsing.js?ver=6.9.1

1function retry(isDone, next) {
2    var current_trial = 0, max_retry = 50, interval = 10, is_timeout = false;
3    var id = window.setInterval(
4        function() {
5            if (isDone()) {
6                window.clearInterval(id);
7                next(is_timeout);
8            }
9            if (current_trial++ > max_retry) {
10                window.clearInterval(id);
11                is_timeout = true;
12                next(is_timeout);
13            }
14        },
15        10
16    );
17}
18
19function isIE10OrLater(user_agent) {
20    var ua = user_agent.toLowerCase();
21    if (ua.indexOf('msie') === 0 && ua.indexOf('trident') === 0) {
22        return false;
23    }
24    var match = /(?:msie|rv:)\s?([\d\.]+)/.exec(ua);
25    if (match && parseInt(match[1], 10) >= 10) {
26        return true;
27    }
28    return false;
29}
30
31function detectPrivateMode(callback) {
32    var is_private;
33
34    if (window.webkitRequestFileSystem) {
35        window.webkitRequestFileSystem(
36            window.TEMPORARY, 1,
37            function() {
38                is_private = false;
39            },
40            function(e) {
41                console.log(e);
42                is_private = true;
43            }
44        );
45    } else if (window.indexedDB && /Firefox/.test(window.navigator.userAgent)) {
46        var db;
47        try {
48            db = window.indexedDB.open('test');
49        } catch(e) {
50            is_private = true;
51        }
52
53        if (typeof is_private === 'undefined') {
54            retry(
55                function isDone() {
56                    return db.readyState === 'done' ? true : false;
57                },
58                function next(is_timeout) {
59                    if (!is_timeout) {
60                        is_private = db.result ? false : true;
61                    }
62                }
63            );
64        }
65    } else if (isIE10OrLater(window.navigator.userAgent)) {
66        is_private = false;
67        try {
68            if (!window.indexedDB) {
69                is_private = true;
70            }                 
71        } catch (e) {
72            is_private = true;
73        }
74    } else if (window.localStorage && /Safari/.test(window.navigator.userAgent)) {
75        try {
76            window.localStorage.setItem('test', 1);
77        } catch(e) {
78            is_private = true;
79        }
80
81        if (typeof is_private === 'undefined') {
82            is_private = false;
83            window.localStorage.removeItem('test');
84        }
85    }
86
87    retry(
88        function isDone() {
89            return typeof is_private !== 'undefined' ? true : false;
90        },
91        function next(is_timeout) {
92            callback(is_private);
93        }
94    );
95}