signInWithGoogle static method

Future<User?> signInWithGoogle({ required BuildContext context, })

Implementation

static Future<User?> signInWithGoogle({required BuildContext context}) async {
  FirebaseAuth auth = FirebaseAuth.instance;
  User? user;

  if (kIsWeb) {
    GoogleAuthProvider authProvider = GoogleAuthProvider();

    try {
      final UserCredential userCredential =
          await auth.signInWithPopup(authProvider);

      user = userCredential.user;
    } catch (e) {
      print(e);
    }
  } else {
    final GoogleSignIn googleSignIn = GoogleSignIn();

    final GoogleSignInAccount? googleSignInAccount =
        await googleSignIn.signIn();

    if (googleSignInAccount != null) {
      final GoogleSignInAuthentication googleSignInAuthentication =
          await googleSignInAccount.authentication;

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

      try {
        final UserCredential userCredential =
            await auth.signInWithCredential(credential);

        user = userCredential.user;
      } on FirebaseAuthException catch (e) {
        if (e.code == 'account-exists-with-different-credential') {
          ScaffoldMessenger.of(context).showSnackBar(
            GAuthentication.customSnackBar(
              content:
                  'The account already exists with a different credential',
            ),
          );
        } else if (e.code == 'invalid-credential') {
          ScaffoldMessenger.of(context).showSnackBar(
            GAuthentication.customSnackBar(
              content:
                  'Error occurred while accessing credentials. Try again.',
            ),
          );
        }
      } catch (e) {
        ScaffoldMessenger.of(context).showSnackBar(
          GAuthentication.customSnackBar(
            content: 'Error occurred using Google Sign In. Try again.',
          ),
        );
      }
    }
  }

  return user;
}