Sign in with Flutter and implement signup using Firebase Auth

I will write about implementing the authentication function using Firebase Auth using a mail address and password.

Preparation

Introducing the plug-in.

Edit pubspec.yml.

dependencies:
  flutter:
    sdk: flutter
  firebase_auth: ^0.6.6

After adding, execute the following command.

flutter packages get

Sign up

Future<FirebaseUser> signUp(String email, String password) async {
    final FirebaseAuth _auth = FirebaseAuth.instance;
    final FirebaseUser user = await _auth.createUserWithEmailAndPassword(
        email: email, password: password);
    print(user);
    return user;
  }

Login

Future<FirebaseUser> singIn(String email, String password) async {
    final FirebaseAuth _auth = FirebaseAuth.instance;
    final FirebaseUser user = await _auth.signInWithEmailAndPassword(
        email: email, password: password);
    print("User id is ${user.uid}");
    return user;
  }

Both signing in and signing up will be returned if FirebaseUserthe user information is stored and you can retrieve the user.emailuser's mail address in, or user.uidyou can get a string that is unique for each user in.

Password reset

final FirebaseAuth _auth = FirebaseAuth.instance;
_auth.sendPasswordResetEmail(email: email).then((doc) {
      Navigator.pop(context);
      _onSuccessDialog();
    }).catchError((err) {
      _onErrorDialog(err);
    });