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Detect private browsing mode (InPrivate Browsing or Incognito).
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| function retry(isDone, next) { | |
| var current_trial = 0, max_retry = 50, interval = 10, is_timeout = false; | |
| var id = window.setInterval( | |
| function() { | |
| if (isDone()) { | |
| window.clearInterval(id); | |
| next(is_timeout); | |
| } | |
| if (current_trial++ > max_retry) { | |
| window.clearInterval(id); | |
| is_timeout = true; | |
| next(is_timeout); | |
| } | |
| }, | |
| 10 | |
| ); | |
| } | |
| function isIE10OrLater(user_agent) { | |
| var ua = user_agent.toLowerCase(); | |
| if (ua.indexOf('msie') === 0 && ua.indexOf('trident') === 0) { | |
| return false; | |
| } | |
| var match = /(?:msie|rv:)\s?([\d\.]+)/.exec(ua); | |
| if (match && parseInt(match[1], 10) >= 10) { | |
| return true; | |
| } | |
| return false; | |
| } | |
| function detectPrivateMode(callback) { | |
| var is_private; | |
| if (window.webkitRequestFileSystem) { | |
| window.webkitRequestFileSystem( | |
| window.TEMPORARY, 1, | |
| function() { | |
| is_private = false; | |
| }, | |
| function(e) { | |
| console.log(e); | |
| is_private = true; | |
| } | |
| ); | |
| } else if (window.indexedDB && /Firefox/.test(window.navigator.userAgent)) { | |
| var db; | |
| try { | |
| db = window.indexedDB.open('test'); | |
| } catch(e) { | |
| is_private = true; | |
| } | |
| if (typeof is_private === 'undefined') { | |
| retry( | |
| function isDone() { | |
| return db.readyState === 'done' ? true : false; | |
| }, | |
| function next(is_timeout) { | |
| if (!is_timeout) { | |
| is_private = db.result ? false : true; | |
| } | |
| } | |
| ); | |
| } | |
| } else if (isIE10OrLater(window.navigator.userAgent)) { | |
| is_private = false; | |
| try { | |
| if (!window.indexedDB) { | |
| is_private = true; | |
| } | |
| } catch (e) { | |
| is_private = true; | |
| } | |
| } else if (window.localStorage && /Safari/.test(window.navigator.userAgent)) { | |
| try { | |
| window.localStorage.setItem('test', 1); | |
| } catch(e) { | |
| is_private = true; | |
| } | |
| if (typeof is_private === 'undefined') { | |
| is_private = false; | |
| window.localStorage.removeItem('test'); | |
| } | |
| } | |
| retry( | |
| function isDone() { | |
| return typeof is_private !== 'undefined' ? true : false; | |
| }, | |
| function next(is_timeout) { | |
| callback(is_private); | |
| } | |
| ); | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <div id="result"></div> | |
| <script src="detect-private-browsing.js"></script> | |
| <script> | |
| detectPrivateMode( | |
| function(is_private) { | |
| document.getElementById('result').innerHTML = typeof is_private === 'undefined' ? 'cannot detect' : is_private ? 'private' : 'not private'; | |
| } | |
| ); | |
| </script> | |
| </body> | |
| </html> |
I've noticed in Safari 11 normal browsing mode window.openDatabase(null, null, null, null) will throw an exception if a user has just cleared their history and refreshed.
I'm using Safari 11.1 (11605.1.33.1.4) on OSX 10.11.6 and am getting "not private" when using a private window.
I switched line 82 to "true" and that seemed to fix it for me.
- Incognito mode detection
- Detection of bot browsing
- You can ignore mode(normal or incognito) detection if is a bot browsing
- Configure custom callbacks when private or not (you can implement a paywall in a callback when incognito detected)
https://github.com/Maykonn/js-detect-incognito-private-browsing-paywall
Has anyone found a solution for chrome IOS 12 + for detecting private mode?
@tormod17 where/how are you trying to attempting this check? Any chance you're doing this in an iframe?
False positive on iOS 12+ as tormod17 mentioned, are we playing whack a mole here with each iOS release/patch?
function isPrivate(callback) {
callback || (callback = function(){});
var fs = window.RequestFileSystem || window.webkitRequestFileSystem;
if(fs){
return fs(window.TEMPORARY, 1, callback.bind(this, false), callback.bind(this, true));
}
if(window.indexedDB && /Firefox/.test(window.navigator.userAgent)){
try {
var db = window.indexedDB.open('test');
var tryes = 0;
var interval = limit = 10;
var wait = function(check){
if(tryes >= limit){ return callback(true); } // Give up
return window.setTimeout(check, ++tryes * interval);
}
var evaluate = function(){
return db.readyState === 'done' ? callback(!db.result) : wait(evaluate);
}
return wait(evaluate);
} catch (e) {
return callback(true);
}
}
if (!!window.navigator.userAgent.match(/(MSIE|Trident|Edge)/)){
try {
return callback(!window.indexedDB);
} catch (e) {
return callback(true);
}
}
try {
window.openDatabase(null, null, null, null);
return callback(false);
} catch (e) {
return callback(true);
}
}
isPrivate( function(isPrivate) {
console.log('Private mode ===>', isPrivate);
});
function isPrivate(callback) { callback || (callback = function(){}); var fs = window.RequestFileSystem || window.webkitRequestFileSystem; if(fs){ return fs(window.TEMPORARY, 1, callback.bind(this, false), callback.bind(this, true)); } if(window.indexedDB && /Firefox/.test(window.navigator.userAgent)){ try { var db = window.indexedDB.open('test'); var tryes = 0; var interval = limit = 10; var wait = function(check){ if(tryes >= limit){ return callback(true); } // Give up return window.setTimeout(check, ++tryes * interval); } var evaluate = function(){ return db.readyState === 'done' ? callback(!db.result) : wait(evaluate); } return wait(evaluate); } catch (e) { return callback(true); } } if (!!window.navigator.userAgent.match(/(MSIE|Trident|Edge)/)){ try { return callback(!window.indexedDB); } catch (e) { return callback(true); } } try { window.openDatabase(null, null, null, null); return callback(false); } catch (e) { return callback(true); } } isPrivate( function(isPrivate) { console.log('Private mode ===>', isPrivate); });
window chrome the result is error!
This does not seem to work anymore
https://twitter.com/paul_irish/status/1138471166115368960
for desktop you can use
https://mishravikas.com/articles/2019-07/bypassing-anti-incognito-detection-google-chrome.html
(async () => {
if ("storage" in navigator && "estimate" in navigator.storage) {
const { usage, quota } = await navigator.storage.estimate();
console.log(`Using ${usage} out of ${quota} bytes.`);
if (quota < 120000000) {
console.log("Incognito");
} else {
console.log("Not Incognito");
}
} else {
console.log("Can not detect");
}
})();
Incorrect reading for Chrome 81 when not in incognito
It's able to detect private mode in chrome 85
not working with latest version
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IE can return true when it's not when you have your restriction on your policy to disable indexedDB