email_password_sign_in_model.dart

class EmailPasswordSignInModel with EmailAndPasswordValidators, ChangeNotifier {
  EmailPasswordSignInModel({
    @required this.firebaseAuth,
    this.email = '',
    this.password = '',
    this.formType = EmailPasswordSignInFormType.signIn,
    this.isLoading = false,
    this.submitted = false,
  });
  final FirebaseAuth firebaseAuth;

  String email;
  String password;
  EmailPasswordSignInFormType formType;
  bool isLoading;
  bool submitted;
  
  Future<bool> submit() async {
    try {
      updateWith(submitted: true);
      if (!canSubmit) {
        return false;
      }
      updateWith(isLoading: true);
      switch (formType) {
        case EmailPasswordSignInFormType.signIn:
          await firebaseAuth.signInWithCredential(
            EmailAuthProvider.credential(email: email, password: password)
          );
          break;
        case EmailPasswordSignInFormType.register:
          UserCredential userCredential = await firebaseAuth.createUserWithEmailAndPassword(
            email: email, password: password
          );
          await FirestoreService.createUser(userCredential);
          break;
        case EmailPasswordSignInFormType.forgotPassword:
          await firebaseAuth.sendPasswordResetEmail(email: email);
          updateWith(isLoading: false);
          break;
      }
      return true;
    } catch (e) {
      updateWith(isLoading: false);
      rethrow;
    }
  }
  
  // ...略
}