-
-
Save Clarencef/8ec7e3e57daaf1af5543e50b75d9dc49 to your computer and use it in GitHub Desktop.
Detect if the browser is running in Private mode
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/** | |
* Detect if the browser is running in Private mode | |
* | |
* @returns {Promise} | |
*/ | |
function isPrivateMode() { | |
return new Promise((resolve) => { | |
const on = () => resolve(true); // is in private mode | |
const off = () => resolve(false); // not private mode | |
const testLocalStorage = () => { | |
try { | |
if (localStorage.length) off(); | |
else { | |
localStorage.x = 1; | |
localStorage.removeItem('x'); | |
off(); | |
} | |
} catch (e) { | |
// Safari only enables cookie in private mode | |
// if cookie is disabled, then all client side storage is disabled | |
// if all client side storage is disabled, then there is no point | |
// in using private mode | |
navigator.cookieEnabled ? on() : off(); | |
} | |
}; | |
// Chrome & Opera | |
if (window.webkitRequestFileSystem) { | |
return void window.webkitRequestFileSystem(0, 0, off, on); | |
} | |
// Firefox | |
if ('MozAppearance' in document.documentElement.style) { | |
if (indexedDB === null) return on(); | |
const db = indexedDB.open('test'); | |
db.onerror = on; | |
db.onsuccess = off; | |
return void 0; | |
} | |
// Safari | |
const isSafari = navigator.userAgent.match(/Version\/([0-9\._]+).*Safari/); | |
if (isSafari) { | |
const version = parseInt(isSafari[1], 10); | |
if (version < 11) return testLocalStorage(); | |
try { | |
window.openDatabase(null, null, null, null); | |
return off(); | |
} catch (_) { | |
return on(); | |
}; | |
} | |
// IE10+ & Edge InPrivate | |
if (!window.indexedDB && (window.PointerEvent || window.MSPointerEvent)) { | |
return on(); | |
} | |
// default navigation mode | |
return off(); | |
}); | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
isPrivateMode().then((inPrivate) => { | |
console.log('is in private mode: ', inPrivate); | |
}); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment