emailPasswordSignIn method

@override Future<String?> emailPasswordSignIn(LoginCredentials credentials)

returns Error message. Returns null if was successful

Implementation

@override
Future<String?> emailPasswordSignIn(LoginCredentials credentials) async {
  //see https://firebase.flutter.dev/docs/auth/usage/#emailpassword-registration--sign-in
  try {
    UserCredential userCredential = await FirebaseAuth.instance
        .signInWithEmailAndPassword(
            email: credentials.email, password: credentials.password);
    return null;
  } on FirebaseAuthException catch (e) {
    if (e.code.contains(FirebaseAuthErrorCode.wrongPassword)) {
      return "Wrong password";
    }
    if (e.code == 'weak-password') {
      return 'The password provided is too weak.';
    } else if (e.code == 'email-already-in-use') {
      return 'The account already exists for that email.';
    } else {
      return ("Failed to login");
    }
  } catch (e) {
    return "Failed to login $e";
  }
}