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. [email protected]), 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 [email protected]) 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 == [email protected])
    log user in;
} else {
    return error message('invalid email')
}

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

Solution

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.

Comments

[Igor D]

thanks! I will try and see if this implementation works for me. I appreciate you helping me :)

[Igor D]

is this using the google_sign_in dart package? and how do I validate that the user is a university student, as I do not see any validations? still thanks for helping!

[Ammar Hussein]

You're welcome, don't forget to mark it as the right answer if it was helpful :)

[Igor D]

hello sir. this was a good recommendation, but there is currently no way to create a google login with flutter on firebase. the firebase_auth has removed the signinWith google option and i am not sure how to create a google login now anymore :/

[Ammar Hussein]

github.com/ammaratef45/Attendance/blob/master/attendance/lib‌​/… this is how I handle it in my project, remember to use the same versions of packages in my pubspec file

[Igor D]

thanks! i found another git with the same implementation as yours. i still have some problems with the setstate, as this is giving me errors (setstate called after dispose) i changed from a login form to google, and there still might be some dirty code. :/ would you mind taking a look?