WKWebView setting Cookie not possible (iOS 11+) - ios

Question

I am desperately trying to add a custom cookie to a WKWebView instance (without using Javascript or similar workarounds).
From iOS 11 and upwards, Apple provides an API to do this: The WKWebViews WKWebsiteDataStore has a property httpCookieStore.
Here is my (example) code:
import UIKit
import WebKit
class ViewController: UIViewController {
var webView: WKWebView!
override func viewDidLoad() {
webView = WKWebView()
view.addSubview(webView)
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
let cookie = HTTPCookie(properties: [
HTTPCookiePropertyKey.domain : "google.com",
HTTPCookiePropertyKey.path : "/",
HTTPCookiePropertyKey.secure : true,
HTTPCookiePropertyKey.name : "someCookieKey",
HTTPCookiePropertyKey.value : "someCookieValue"])!
let cookieStore = webView.configuration.websiteDataStore.httpCookieStore
cookieStore.setCookie(cookie) {
DispatchQueue.main.async {
self.webView.load(URLRequest(url: URL(string: "https://google.com")!))
}
}
}
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
webView.frame = view.bounds
}
}
After this, if I use webView.configuration.websiteDataStore.httpCookieStore.getAllCookies(completionHandler:) I see that my cookie is in the list of cookies.
However, when inspecting the webview using Safari's developer tools (using a iOS Simulator of course) the cookie does not show up.
I also tried to inspect the traffic using a HTTP proxy (Charles in my case) to see if the cookie in included in my HTTP requests. It is not.
What am I doing wrong here? How can I add a cookie to WKWebView (on iOS versions 11 and up)?

Answer 1

A bit late but I want to share a solution that worked for me, I hope it helps someone facing the same issue on iOS 12 as well.
Here is the simplified workflow I used:
Instantiate a WKWebsiteDataStore object
Set the custom cookie to its httpCookieStore
Wait for the cookie to be set
Instantiate the WKWebView
Load the request
To do that I have created an extension of WKWebViewConfiguration:
extension WKWebViewConfiguration {
static func includeCookie(cookie:HTTPCookie, preferences:WKPreferences, completion: #escaping (WKWebViewConfiguration?) -> Void) {
let config = WKWebViewConfiguration()
config.preferences = preferences
let dataStore = WKWebsiteDataStore.nonPersistent()
DispatchQueue.main.async {
let waitGroup = DispatchGroup()
waitGroup.enter()
dataStore.httpCookieStore.setCookie(cookie) {
waitGroup.leave()
}
waitGroup.notify(queue: DispatchQueue.main) {
config.websiteDataStore = dataStore
completion(config)
}
}
}
And for my example I have used it as follows:
override func viewDidLoad() {
self.AddWebView()
}
private func addWebView(){
let preferences = WKPreferences()
preferences.javaScriptEnabled = true
preferences.javaScriptCanOpenWindowsAutomatically = true
let cookie = HTTPCookie(properties: [
.domain: COOKIE_DOMAIN,
.path: "/",
.name: COOKIE_NAME,
.value: myCookieValue,
.secure: "TRUE",
.expires: NSDate(timeIntervalSinceNow: 3600)
])
//Makes sure the cookie is set before instantiating the webview and initiating the request
if let myCookie = cookie {
WKWebViewConfiguration.includeCookie(cookie: myCookie, preferences: preferences, completion: {
[weak self] config in
if let `self` = self {
if let configuration = config {
self.webView = WKWebView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width , height: self.view.frame.height), configuration: configuration)
self.view.addSubview(self.webView)
self.webView.load(self.customRequest)
}
}
}
}

Answer 2

Any request to google.com redirects to www.google.com.
You would need to add www. to the domain field of the cookie. If the domain or the path doesn't match the request, the cookie won't be sent.
You can add the cookies explicitly.
let url = URL(string: "https://www.google.com")!
var request = URLRequest(url: url)
if let cookies = HTTPCookieStorage.shared.cookies(for: url) {
request.allHTTPHeaderFields = HTTPCookie.requestHeaderFields(with: cookies)
}
self.webView.load(request)

Answer 3

For iOS 11+ you really don't need to worry about cookies part it is very simple. Create your cookie like this. Don't make it secure true
let newcookie = HTTPCookie(properties: [
.domain: "domain",
.path: "/",
.name: "name",
.value: "vale",
.secure: "FALSE",
.expires: NSDate(timeIntervalSinceNow: 31556926)
])!
self.webview.configuration.websiteDataStore.httpCookieStore.setCookie(newcookie, completionHandler: {
// completion load your url request here. Better to add cookie in Request as well. like this way
request.addCookies()
//enable cookie through request
request.httpShouldHandleCookies = true
//load request in your webview.
})
Request extention add after cookie value ";"
extension URLRequest {
internal mutating func addCookies() {
var cookiesStr: String = ""
let mutableRequest = ((self as NSURLRequest).mutableCopy() as? NSMutableURLRequest)!
cookiesStr += cookie.name + "=" + cookie.value + ";"
mutableRequest.setValue(cookiesStr, forHTTPHeaderField: "Cookie")
self = mutableRequest as URLRequest
}
}
Also i can see your are not setting WKWebViewConfiguration of wkwebview. Set configuration of your wkwebview. Also implement WKHTTPCookieStoreObserver and implement function.
func cookiesDidChange(in cookieStore: WKHTTPCookieStore) {
// Must implement otherwise wkwebview cookie not sync properly
self.httpCookieStore.getAllCookies { (cookies) in
cookies.forEach({ (cookie) in
})
}
}
Hope so this will work.