I am a beginner. I am developing an app with swift. I am using Firebase for signin. But I was wondering if I need to write codes to check user's sign-in status for each viewController for security. Or sign-in is needed only for the sign-in viewController like locking just a front door. My code may not be needed but below is the code that I wrote:
// Mark: User Sign-in Status Recheck
Auth.auth().addStateDidChangeListener { auth, user in
if user != nil {
if let user = user {
let userUid = user.uid
let userEmail = user.email
}
} else {
let InitialSignInFirstViewController = self.storyboard?.instantiateViewController(withIdentifier: "SignInFirstViewController") as! InitialSignInViewController
self.present(SignInFirstViewController, animated: false, completion: nil)
}
}
In my app I have a swift page that checks if the user is signed in when the app loads. If they are signed in they continue to the app, and you don't need to check until the app quits, and opens again. If they aren't signed in they go to another view controller to get signed in.
You don't need to manage the state or run the listener, there is more simpler way to do that, i.e.,
if Auth.auth().currentUser != nil {
// User is signed in.
// ...
} else {
// No user is signed in.
// ...
}
Update
You can create one class which just provide the user sign in status like below:
struct UserSignInStatus {
var isLoggedIn: Bool {
return (Auth.auth().currentUser != nil)
}
}
Usage: UserSignInStatus.isLoggedIn
You can put this code any where like in your AppDelegate class where you check the signin status and depending on that managing your rootViewController. Let me know if you need any more help.
Related
Was working with Firebase for almost half year now and never had this issue. Using code just like before to create new user, he shows up in console, when i close app i can sign in but using same code as always it keeps prompting me for password. In first VC i have:
if let user = Auth.auth().currentUser {
performSegue(withIdentifier: "authorized", sender: self)
}
Which will check if there is auth token stored and perform segue to loading screen. However this never happens. The code is ran but doesn't do anything, no errors in compiler and no errors in console.
EDIT 1: also tried to create new project where i rewrote all the code getting same result, but my other project works without any issues, also i'm able to do anything else besides this using firebase such as access Firestore just not storing the user, went over all the documentation but couldn't find any solution.
EDIT 2: sign in code
if(email.text != "" && password.text != ""){
Auth.auth().signIn(withEmail: email.text!, password: password.text!) { user, error in
if(error == nil && user != nil) {
userID = (Auth.auth().currentUser?.uid)!
print("Signed in as: \(userID)")
self.performSegue(withIdentifier: "load", sender: self)
} else {
print("Error found: \(error?.localizedDescription)")
}
}
}
Solution:
DispatchQueue.main.async(){
if let user = Auth.auth().currentUser {
userID = (Auth.auth().currentUser?.uid)!
self.performSegue(withIdentifier: "authorized", sender: self)
}
}
Loaded with async so firebase will configure before checking for auth
The issue is likely that you are calling your code before firebase has properly initialized. I recommend using the entry view controller's viewDidAppear for things such as these. If you were using viewDidLoad, it is likely that firebase did not load yet.
I've been working for a while on the login part of my app. I'm trying to use ASW Mobile Hub for this matter. I found a way to get it work with the different providers I need: my own user pool, FB and Google.
The problem is that I've been searching here and all over the AWS documentation trying to find the way to get user data (Username and some othe user data like picture, email and so on). I can get it if I'm using the FBSDK directly (usingFBSDKGraphRequest) but I don't know how to do it if the user choose to login in my cognito-user-pool. Also I cannot see what provider the user used once succeeded.
I can find some other ways to get that, but using the old SDK o directly Cognito calls and initially is not what I need. Here's the code I'm using to present the login window:
override func viewDidLoad() {
super.viewDidLoad()
if !AWSSignInManager.sharedInstance().isLoggedIn {
presentAuthUIViewController()
}
}
func presentAuthUIViewController() {
let config = AWSAuthUIConfiguration()
config.enableUserPoolsUI = true
config.addSignInButtonView(class: AWSFacebookSignInButton.self)
config.addSignInButtonView(class: AWSGoogleSignInButton.self)
AWSAuthUIViewController.presentViewController(
with: self.navigationController!,
configuration: config, completionHandler: { (provider:
AWSSignInProvider, error: Error?) in
if error == nil {
// SignIn succeeded.
} else {
// end user faced error while loggin in, take any
required action here.
}
})
}
So, the question is, how can I get the relevant user info, once the signin is succeeded?
If the user used cognito login, you can use the below code to get the username.
let identityManager = AWSIdentityManager.default()
let identityUserName = identityManager.identityProfile?.userName
For retrieving the provider once user succeeds, keep it in the session as below
func onLogin(signInProvider: AWSSignInProvider, result: Any?,
authState: AWSIdentityManagerAuthState, error: Error?) {
let defaults = UserDefaults.standard
defaults.set(signInProvider.identityProviderName, forKey:
"identityProviderName")
}
Hope this answer helps.
Updated Code to get Username:
let pool = AWSCognitoIdentityUserPool.init(forKey: "CognitoUserPools")
let username = pool.currentUser()?.username
I've been working on a workaround till I sort this out in a more elegant way. I guess that I need to go deeper in Cognito's understanding. But the fact is even the sample provided by Amazon doesen't show the User's Name...
Sample Amazon app screen
So, in the meantime, I modified the source code of the Cognito library AWSUserPoolsUIOperations to send me the data directly to my app, on a message:
#implementation AWSUserPoolsUIOperations
-(void)loginWithUserName:(NSString *)userName
password:(NSString *)password
navigationController:(UINavigationController *)navController
completionHandler:(nonnull void (^)(id _Nullable, NSError *
_Nullable))completionHandler {
self.userName = userName;
NSDictionary* userInfo = #{#"username": self.userName};
[[NSNotificationCenter defaultCenter]
postNotificationName:#"UsernameNotification"
object:nil userInfo:userInfo];
And then just getting the message in the app and storing the value.
#objc private func TestNotification(_ notification: NSNotification){
if let dict = notification.userInfo as NSDictionary? {
if let username = dict["username"] as? String {
appEstats.username = username
defaults.set(username, forKey: sUserName)
}
}
}
As I said is not the solution but in the meantime it works.
In my app I want do display different ViewControllers depending on if the user is already logged in or not. Like if the user is logged in present VC_A if not, present VC_B. I tried the following code in my vc_login:
if let user = FIRAuth.auth()?.currentUser {
let vc = self.storyboard?.instantiateViewController(withIdentifier: "vc_home") as! ViewController_Home
self.present(vc, animated: true, completion: nil)
} else {
// Do Nothing
}
You can do it like that (hints are in the code comments):
if FIRAuth.auth()?.currentUser?.uid == nil {
// user is not logged in
// present VC_B
} else {
// user is logged in
// present VC_A
}
Or you can use the ternary conditional operator like this:
FIRAuth.auth()?.currentUser?.uid == nil ? presentViewControllerB() : presentViewControllerA()
func presentViewControllerA() {
// call if logged in
}
func presentViewControllerB() {
// call if not logged in
}
I'm going to start this question by apologizing for such an open ended question, but I am really struggling and all the documentation is outdated.
Amazon's provided sample app hasn't been updated and I get nothing but errors when attempting to run it. I have a login page setup and ready to go with email and password, and I have tried this code:
#IBAction func signInButtonTouched(sender: UIButton) {
if (emailTextField.text != nil) && (passwordTextField.text != nil) {
let user = (UIApplication.sharedApplication().delegate as! AppDelegate).userPool!.getUser(emailTextField.text!)
user.getSession(emailTextField.text!, password: passwordTextField.text!, validationData: nil, scopes: nil).continueWithExecutor(AWSExecutor.mainThreadExecutor(), withBlock: {
(task:AWSTask!) -> AnyObject! in
if task.error == nil {
// user is logged in - show logged in UI
} else {
// error
}
return nil
})
} else {
// email or password not set
}
}
but unfortunately I'm getting App Delegate has no member "userPool" errors. It does though! I am very new at this, and I have searched github and read through all of Amazon's samples, but the documentation is either in Objective-C, or outdated and doesn't work properly.
Any help with this would be vastly appreciated.
I am currently trying to create a function that automatically detects if an account has been disabled or not.
By this, I mean that I want the user to be logged out automatically, and not have the permission to do anything.
I know the stuff about permissions are done in firebase security & rules. However, I have no idea on how to disallow activity from disabled accounts. I am only familiar with the auth.uid and variables.
How should I proceed if I want to do this?
I have played with the idea of re-authenticating the user for each form it proceeds to, but I quickly figured out that this would be unnecessary use of data.
Or is this the way to go?
One of the way is use of authentication. You need to re-authenticate the firebase user:
user?.reauthenticateWithCredential(credential) { error in
if let error = error {
// An error happened.
} else {
// User re-authenticated.
}
}
You get FIRAuthErrorCodeUserDisabled error if account is disabled.
Run this in a loop at some time-interval.
I reloaded the current User, if it's disabled you will get an error:
if let userInfo = Auth.auth().currentUser {
userInfo.reload(completion: { (error) in
guard error == nil else {
debugPrint(error.debugDescription)
return
}
})
}
Your asked a while ago, hope answer still helps:
You can add an observer for authStateDidChange, so it got fired if user logged out
NotificationCenter.default.addObserver(forName: NSNotification.Name.AuthStateDidChange, object: Auth.auth(), queue: nil) { _ in
if ((Auth.auth().currentUser) == nil) {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let mvc = storyboard.instantiateViewController(withIdentifier: "MainViewController")
self.window!.rootViewController = mvc
let options: UIView.AnimationOptions = .transitionCrossDissolve
let duration: TimeInterval = 0.1
UIView.transition(with: self.window!, duration: duration, options: options, animations: {}, completion:
{ completed in
self.window?.rootViewController?.performSegue(withIdentifier: "showWelcomeView", sender: nil)
})
}
}
The cool thing now is if you call the reload command, like MegaChan mentioned before, and the user got disabled or deleted, the firebase controller logs the user out, the observer fires authstate did change and your login screen, in my case welcomeviewcontroller shows up ;)