Flutter: way to validate one sort of google account?

Question

I'm building an app in flutter (latest build) for students on the university. every student has its own email and password (ex. s2170456@student.utwente.nl), which is integrated in google, so everyone is able to see notifications in Gmail.

This does also mean; if you want to log in with google, your studentEmail is an option to do so. I want to implement a google log-in feature where only student of the university (with their email sXXXXXXX@student.utwente.nl) are able to login.

My question is: is there a way to filter on the google login email? I thought about using normal email login and use RegEx to validate, but this means student should firstly signup. I would like to skip the whole sign-up and let the students use their already owned student email to signin.

it should look something like this (if it is even possible) VV

Widget googleLogin () {
googleLogin button()
if(googlelogin.email == sXXXXXXX@student.utwente.nl)
    log user in;
} else {
    return error message('invalid email')
}

I want this to be able to only register and login user with student email.

Answer 1

You can use google sign in integration like this.

  GoogleSignInAccount _currentUser;

then in init state:-

@override
  void initState() {
    super.initState();

  _googleSignIn.onCurrentUserChanged.listen((GoogleSignInAccount account) {
   setState(() {
     _currentUser = account;
     print("User Name ${_currentUser.displayName}");
     print("User Email ${_currentUser.email}");
    });

   if (_currentUser != null) {
     var socialData = SocialData(
        _currentUser.displayName, "", _currentUser.email, LoginType.GOOGLE);
     _startHomeScreen(socialData);
   } else {
    _showError('Error, Please try again later');
   }
 });

}

on successful login, this will execute:-

 _startHomeScreen(SocialData data) {
    Navigator.push(context, MaterialPageRoute(builder: (context) {
      return Home(socialData: data);
    }));
  }


     Future<void> _handleSignIn() async {
    try {
    await _googleSignIn.signIn();
     } catch (error) {
    print(error);
   }
  }

Call _handleSignIn() on click of google sign in button.