Flutter Firebase Authentication currentUser() returns null

Question

This is about Flutter Firebase Authentication plugin.
I am trying to send a verification email after creating a new user, but sendEmailVerification() internally uses currentUser(). This looks like a bug to me, but just in case, I am posting a question to stackoverflow. The error is the same on Android and IOS.

First two lines return FirebaseUser. The third returns null. Forth, if third is commented throws a null reference error.

Thanks,
Boris

user = await _auth.createUserWithEmailAndPassword(email: email, password: password); 
// result is FirebaseUser
user = await _auth.signInWithEmailAndPassword(email: email, password: password);
// result is FirebaseUser    
user = await _auth.currentUser();
// result is null    
await user.sendEmailVerification();
//null reference, because it internally uses .currentUser()

Boris R. · Accepted Answer · 2018-05-23 15:49:20Z

2

Here is what I found, and I am no sure is it still a bug or not, but there is a way to make it work. FirebaseUser returned by signInWithEmailAndPassword is not really authenticated. Only user returned by onAuthStateChanged stream is. So, if you call user.sendEmailVerification() from onAuthStateChanged context, then everything is fine.

This will work:

_firebaseUserChanged = _auth.onAuthStateChanged.listen((FirebaseUser user) {
    if (user != null && !user.isEmailVerified) {
        user.sendEmailVerification(); 
   }
});

Of course, this code is simplified. We do not want to send verification email on every login attempt.

answered May 23, 2018 at 15:49

Boris R.

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Comments

Edman · Accepted Answer · 2018-05-20 23:44:38Z

1

Looking at the firebase_auth code I see that signInWithEmailAndPassword does instantiate and return a user. That's probably the user you need to call sendEmailVerification with.

final user = await _auth.signInWithEmailAndPassword(email: email, password: password);
await user.sendEmailVerification();

answered May 20, 2018 at 23:44

Edman

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4 Comments

Boris R. Over a year ago

This is exactly what I wrote in my question. It does return FirebaseUser, but once you call sendEmailVerification() on it, the call fails.

Edman Over a year ago

This does look weird. Looking into the java plugin it does call firebaseAuth.signInWithEmailAndPassword which means currentUser should be set, unless there was some problem with the sign in. Are you sure the user exists and the email/password are correct?

Edman Over a year ago

If you have an existing user in Firebase and after calling _auth.signInWithEmailAndPassword with correct credentials, _auth.currentUser returns null, this is a bug.

Boris R. Over a year ago

Yes, I have no problems authenticating with signInWithEmailAndPassword, and getting back FirebaseUser. I think it must be a bug.

Keita · Accepted Answer · 2020-12-09 16:58:00Z

1

What if you reload the returned FirebaseUser? This worked for me.

const User currentUser = await auth.currentUser;
if (currentUser != null) {
  await currentUser.reload();
}

Clearly simplified code. Note: auth.currentUser() is now auth.currentUser.

answered Dec 9, 2020 at 16:58

Keita

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