detect-incognito
Version:
detectIncognito.js can be used to detect incognito mode & other private browsing modes on most modern browsers as of March 2022.
192 lines • 6.41 kB
JavaScript
/**
*
* detectIncognito v1.0.0 - (c) 2022 Joe Rutkowski <Joe@dreggle.com> (https://github.com/Joe12387/detectIncognito)
*
**/
export const detectIncognito = function () {
return new Promise(function (resolve, reject) {
var browserName = "Unknown";
function __callback(isPrivate) {
resolve({
isPrivate: isPrivate,
browserName: browserName,
});
}
function identifyChromium() {
var ua = navigator.userAgent;
if (ua.match(/Chrome/)) {
if (navigator.brave !== undefined) {
return "Brave";
}
else if (ua.match(/Edg/)) {
return "Edge";
}
else if (ua.match(/OPR/)) {
return "Opera";
}
return "Chrome";
}
else {
return "Chromium";
}
}
function assertEvalToString(value) {
return value === eval.toString().length;
}
function isSafari() {
var v = navigator.vendor;
return (v !== undefined && v.indexOf("Apple") === 0 && assertEvalToString(37));
}
function isChrome() {
var v = navigator.vendor;
return (v !== undefined && v.indexOf("Google") === 0 && assertEvalToString(33));
}
function isFirefox() {
return (document.documentElement !== undefined &&
document.documentElement.style.MozAppearance !== undefined &&
assertEvalToString(37));
}
function isMSIE() {
return (navigator.msSaveBlob !== undefined && assertEvalToString(39));
}
/**
* Safari (Safari for iOS & macOS)
**/
function macOS_safari14() {
try {
window.safari.pushNotification.requestPermission("https://example.com", "private", {}, function () { });
}
catch (e) {
return __callback(!new RegExp("gesture").test(e));
}
return __callback(false);
}
function iOS_safari14() {
var tripped = false;
var iframe = document.createElement("iframe");
iframe.style.display = "none";
document.body.appendChild(iframe);
iframe.contentWindow.applicationCache.addEventListener("error", function () {
tripped = true;
return __callback(true);
});
setTimeout(function () {
if (!tripped) {
__callback(false);
}
}, 100);
}
function oldSafariTest() {
var openDB = window.openDatabase;
var storage = window.localStorage;
try {
openDB(null, null, null, null);
}
catch (e) {
return __callback(true);
}
try {
storage.setItem("test", "1");
storage.removeItem("test");
}
catch (e) {
return __callback(true);
}
return __callback(false);
}
function safariPrivateTest() {
var w = window;
if (navigator.maxTouchPoints !== undefined) {
if (w.safari !== undefined && w.DeviceMotionEvent === undefined) {
browserName = "Safari for macOS";
macOS_safari14();
}
else if (w.DeviceMotionEvent !== undefined) {
browserName = "Safari for iOS";
iOS_safari14();
}
else {
reject(new Error("detectIncognito Could not identify this version of Safari"));
}
}
else {
browserName = "Safari";
oldSafariTest();
}
}
/**
* Chrome
**/
function getQuotaLimit() {
var w = window;
if (w.performance !== undefined &&
w.performance.memory !== undefined &&
w.performance.memory.jsHeapSizeLimit !== undefined) {
return performance.memory.jsHeapSizeLimit;
}
return 1073741824;
}
// >= 76
function storageQuotaChromePrivateTest() {
navigator.webkitTemporaryStorage.queryUsageAndQuota(function (usage, quota) {
__callback(quota < getQuotaLimit());
}, function (e) {
reject(new Error("detectIncognito somehow failed to query storage quota: " +
e.message));
});
}
// 50 to 75
function oldChromePrivateTest() {
var fs = window.webkitRequestFileSystem;
var success = function () {
__callback(false);
};
var error = function () {
__callback(true);
};
fs(0, 1, success, error);
}
function chromePrivateTest() {
if (Promise !== undefined && Promise.allSettled !== undefined) {
storageQuotaChromePrivateTest();
}
else {
oldChromePrivateTest();
}
}
/**
* Firefox
**/
function firefoxPrivateTest() {
__callback(navigator.serviceWorker === undefined);
}
/**
* MSIE
**/
function msiePrivateTest() {
__callback(window.indexedDB === undefined);
}
function main() {
if (isSafari()) {
safariPrivateTest();
}
else if (isChrome()) {
browserName = identifyChromium();
chromePrivateTest();
}
else if (isFirefox()) {
browserName = "Firefox";
firefoxPrivateTest();
}
else if (isMSIE()) {
browserName = "Internet Explorer";
msiePrivateTest();
}
else {
reject(new Error("detectIncognito cannot determine the browser"));
}
}
main();
});
};
//# sourceMappingURL=detectIncognito.js.map