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  //Create Google Auth credentials to pass to Firebase
  final GoogleAuthCredential googleAuthCredential =
  GoogleAuthProvider.credential(
    accessToken: googleAuth.accessToken,
    idToken: googleAuth.idToken,
  );

  //Authenticate against Firebase with Google credentials
  await firebaseAuth.signInWithCredential(googleAuthCredential).then((userCredential) => {
    setState(() => {

ptruiz

final GoogleSignInAuthentication googleAuth = await googleUser.authentication;

ptruiz

void signInWithGoogle() async {
  final GoogleSignInAccount googleUser = await GoogleSignIn().signIn();

ptruiz

FlatButton(onPressed: () {signInWithGoogle();}, child: Text("Sign In With Google")),

ptruiz

@override
void dispose() {
  if (deepLinkSubscription != null) {
    deepLinkSubscription.cancel();
    deepLinkSubscription = null;
  }
  super.dispose();
}

ptruiz

import 'package:http/http.dart' as http;

ptruiz

  await firebaseAuth.signInWithCredential(credential).then((userCredentials) => {
    setState(() {
      user = userCredentials;
    })
  });
}

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final AuthCredential credential = GithubAuthProvider.credential(
  json.decode(response.body)['access_token'],
);

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void loginWithGitHub(String code) async {
  //Step 4
  final response = await http.post(
    "https://github.com/login/oauth/access_token",
    headers: {
      "Content-Type": "application/json",
      "Accept": "application/json"
    },
    body: "{\"client_id\":\"" + CLIENT_ID
        + "\",\"client_secret\":\"" + CLIENT_SECRET

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@override
void initState() {
  deepLinkSubscription = getLinksStream().listen((String link) {
    String code = getCodeFromGitHubLink(link);
    loginWithGitHub(code);
  }, cancelOnError: true);
  super.initState();
}