isSignInWithGoogle

Google SSO 로그인을 위한 것이다.

구글 로그인시에는 ...

Future<User> handleGoogleSignIn() async {
    try {
      /// Record log in firebase kAnalytics about Google login
      kAnalytics.logLogin(loginMethod: 'google_login');
      final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
      if (googleUser == null) {
        throw Exception('Google login cancelled by user');
      }
      final GoogleSignInAuthentication googleAuth =
          await googleUser.authentication;

      // final AuthCredential credential = GoogleAuthProvider.getCredential(
      //   accessToken: googleAuth.accessToken,
      //   idToken: googleAuth.idToken,
      // );\

      final credential = GoogleAuthProvider.credential(
        accessToken: googleAuth.accessToken,
        idToken: googleAuth.idToken,
      );

      user = (await _firebaseAuth.signInWithCredential(credential)).user;
      authStatus = AuthStatus.LOGGED_IN;
      userId = user.uid;
      isSignInWithGoogle = true;
      createUserFromGoogleSignIn(user);
      notifyListeners();
      return user;
    } on PlatformException catch (error) {
      user = null;
      authStatus = AuthStatus.NOT_LOGGED_IN;
      cprint(error, errorIn: 'handleGoogleSignIn');
      return null;
    } on Exception catch (error) {
      user = null;
      authStatus = AuthStatus.NOT_LOGGED_IN;
      cprint(error, errorIn: 'handleGoogleSignIn');
      return null;
    } catch (error) {
      user = null;
      authStatus = AuthStatus.NOT_LOGGED_IN;
      cprint(error, errorIn: 'handleGoogleSignIn');
      return null;
    }
  }

구글 로그아웃시에는
유저에 관한 것들을 스테이트 클래스에서 지우고
구글에서 지원하는 메소드 _googleSignIn.signOut()을 한다

void logoutCallback() async {
    authStatus = AuthStatus.NOT_LOGGED_IN;
    userId = '';
    _userModel = null;
    user = null;
    _profileUserModelList = null;
    if (isSignInWithGoogle) {
      await _googleSignIn.signOut();
      logEvent('google_logout');
    }
    await _firebaseAuth.signOut();
    notifyListeners();
  }

  /// Alter select auth method, login and sign up page
  void openSignUpPage() {
    authStatus = AuthStatus.NOT_LOGGED_IN;
    userId = '';
    notifyListeners();
  }