detectincognitojs
Version:
detectIncognito.js can be used to detect incognito mode & other private browsing modes on most modern browsers as of 2024.
275 lines (274 loc) • 14 kB
JavaScript
;
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
var __generator = (this && this.__generator) || function (thisArg, body) {
var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
function verb(n) { return function (v) { return step([n, v]); }; }
function step(op) {
if (f) throw new TypeError("Generator is already executing.");
while (g && (g = 0, op[0] && (_ = 0)), _) try {
if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
if (y = 0, t) op = [op[0] & 2, t.value];
switch (op[0]) {
case 0: case 1: t = op; break;
case 4: _.label++; return { value: op[1], done: false };
case 5: _.label++; y = op[1]; op = [0]; continue;
case 7: op = _.ops.pop(); _.trys.pop(); continue;
default:
if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
if (t[2]) _.ops.pop();
_.trys.pop(); continue;
}
op = body.call(thisArg, _);
} catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
}
};
exports.__esModule = true;
exports.detectIncognito = void 0;
function detectIncognito() {
return __awaiter(this, void 0, void 0, function () {
return __generator(this, function (_a) {
switch (_a.label) {
case 0: return [4 /*yield*/, 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 feid() {
var toFixedEngineID = 0;
var neg = parseInt("-1");
try {
neg.toFixed(neg);
}
catch (e) {
toFixedEngineID = e.message.length;
}
return toFixedEngineID;
}
function isSafari() {
return feid() === 44;
}
function isChrome() {
return feid() === 51;
}
function isFirefox() {
return feid() === 25;
}
function isMSIE() {
return (navigator.msSaveBlob !== undefined && assertEvalToString(39));
}
/**
* Safari (Safari for iOS & macOS)
**/
function newSafariTestByStorageFallback() {
var _a;
if (!((_a = navigator.storage) === null || _a === void 0 ? void 0 : _a.estimate)) {
__callback(false);
return;
}
navigator.storage
.estimate()
.then(function (_a) {
var usage = _a.usage, quota = _a.quota;
// iOS 18.x/macOS Safari 18.x (normal): ~41GB
// iOS 18.x/macOS Safari 18.x (private): ~1GB
// If reported quota < 2 GB => likely private
if (quota && quota < 2000000000) {
__callback(true);
}
else {
__callback(false);
}
})["catch"](function () {
__callback(false);
});
}
function newSafariTest() {
var tmp_name = String(Math.random());
try {
var db = window.indexedDB.open(tmp_name, 1);
db.onupgradeneeded = function (i) {
var _a, _b;
var res = (_a = i.target) === null || _a === void 0 ? void 0 : _a.result;
try {
res.createObjectStore('test', {
autoIncrement: true
}).put(new Blob());
}
catch (e) {
var message = e;
if (e instanceof Error) {
message = (_b = e.message) !== null && _b !== void 0 ? _b : e;
}
if (typeof message !== 'string') {
__callback(false);
return;
}
var matchesExpectedError = message.includes('BlobURLs are not yet supported');
if (matchesExpectedError) {
__callback(true);
}
}
finally {
res.close();
window.indexedDB.deleteDatabase(tmp_name);
// indexdb works on newer versions of safari so we need to check via storage fallback
newSafariTestByStorageFallback();
}
};
}
catch (e) {
__callback(false);
}
}
function oldSafariTest() {
var openDB = window.openDatabase;
var storage = window.localStorage;
try {
openDB(null, null, null, null);
}
catch (e) {
__callback(true);
return;
}
try {
storage.setItem('test', '1');
storage.removeItem('test');
}
catch (e) {
__callback(true);
return;
}
__callback(false);
}
function safariPrivateTest() {
if (navigator.maxTouchPoints !== undefined) {
newSafariTest();
}
else {
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 (_, quota) {
var quotaInMib = Math.round(quota / (1024 * 1024));
var quotaLimitInMib = Math.round(getQuotaLimit() / (1024 * 1024)) * 2;
__callback(quotaInMib < quotaLimitInMib);
}, 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 (self.Promise !== undefined && self.Promise.allSettled !== undefined) {
storageQuotaChromePrivateTest();
}
else {
oldChromePrivateTest();
}
}
/**
* Firefox
**/
function firefoxPrivateTest() {
__callback(navigator.serviceWorker === undefined);
}
/**
* MSIE
**/
function msiePrivateTest() {
__callback(window.indexedDB === undefined);
}
function main() {
if (isSafari()) {
browserName = 'Safari';
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();
})];
case 1: return [2 /*return*/, _a.sent()];
}
});
});
}
exports.detectIncognito = detectIncognito;
if (typeof window !== 'undefined') {
window.detectIncognito = detectIncognito;
}
exports["default"] = detectIncognito;