iOS 12 Safari的私人/隐身模式检测

Question

似乎适用于iOS 11和相应Safari版本的旧检测方法不再有效。
我试过这个脚本：https://gist.github.com/cou929/7973956
但它不适用于 iOS 12 上的 safari，也不适用于 iOS 69 上的 Chrome 12。

这个全新的库也不适用于iOS 12浏览器：
https://github.com/Maykonn/js-detect-incognito-private-browsing-paywall

那么iOS 12浏览器有没有解决方案呢？

波士顿环球报似乎有一个解决方案，但我不知道他们是怎么做到的：
https://www.bostonglobe.com/sports/redsox/2018/10/09/redsox/D66J59viZ1qxyZlhI18l8L/story.html (如果您想在隐身/私人模式下阅读 BostonGlobe.com 文章，您将获得一个要求您登录的屏幕(

Answer 1

Chrome Devtools => 检测隐身/隐私模式的模块称为">检测-隐私浏览"，位于webpack:///./~/detect-private-browsing/index.js

// ./~/detect-private-browsing/index.js
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;
}
// MS Edge Detection from this gist: https://gist.github.com/cou929/7973956
var edge = /edge/.exec(ua); 
if (edge && edge[0] == "edge") { 
return true; 
}
return false;
}
module.exports = {
detectPrivateMode: function(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)) {
// One-off check for weird sports 2.0 polyfill
// This also impacts iOS Firefox and Chrome (newer versions), apparently
// @see bglobe-js/containers/App.js:116
if (window.safariIncognito) {
is_private = true;
} else {
try {
window.openDatabase(null, null, null, null);
} catch (e) {
is_private = true;
}
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);
}
);
}
};

Answer 2

//FOR IOS 12
var e = false;
if (window.localStorage && /Safari/.test(window.navigator.userAgent)) {
if (window.safariIncognito) {
e = true;
} else {
try {
window.openDatabase(null, null, null, null);
window.localStorage.setItem("test", 1)
} catch (t) {
e = true;
alert("PRIVATE");
}
}
void !e && (e = !1, window.localStorage.removeItem("test"))
}