I've this initState in the main page for checking auth:
#override
void initState() {
FirebaseAuth.instance.currentUser().then((fire) {
if (fire != null) {
setState(() {
_isAuth = true;
print('^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^6');
print(_isAuth);
print('^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^6');
});
}
});
super.initState();
}
At sign in the user data saved, But if the user already authentic all the data(email, id etc..) lost.
Sign in:
Future<FirebaseUser> signIn() async {
GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
GoogleSignInAuthentication googleSignInAuthentication =
await googleSignInAccount.authentication;
AuthCredential credential = GoogleAuthProvider.getCredential(
accessToken: googleSignInAuthentication.accessToken,
idWhat is the best way to keep the information?
Token: googleSignInAuthentication.idToken);
final FirebaseUser user = await _auth.signInWithCredential(credential);
print(user.displayName);
_authUser = User(id: user.uid, userEmail: user.email);
notifyListeners();
return user;
}
What is the best way to save the data?
Related
I am creating a flutter app. The point is that in my database, I want the users to be recognized with their uid. For users registered with email & password, there is no problem because I can easily access to their uid with user.uid. But when the user registers with his google account, I don't know how to access to his uid. I just know how to access to his id which is different by running _user.id. How to access the user's uid in this case? Here's the code:
class AuthService {
final FirebaseAuth _auth = FirebaseAuth.instance;
final googleSignIn = GoogleSignIn();
GoogleSignInAccount? _user;
// create user object based on firebase user
Users? _userFromFirebaseUser(User? user) {
return user != null ? Users(uid: user.uid) : null;
}
// auth change user stream
Stream<Users?> get user {
return _auth.authStateChanges().map(_userFromFirebaseUser);
}
//register with email & psswrd
Future registerWithEmailAndPassword(String email, String password) async {
try {
UserCredential result = await _auth.createUserWithEmailAndPassword(
email: email, password: password);
User? user = result.user;
await DatabaseService(uid: user!.uid).updateUserData('new user', 0);
return _userFromFirebaseUser(user);
} catch (e) {
print(e.toString());
return null;
}
}
Future signInithGoogle() async {
try {
final result = await googleSignIn.signIn();
if (result == null)
return await DatabaseService(uid: _user!.id)
.updateUserData('new user', 0);
_user = result;
final googleAuth = await result.authentication;
final AuthCredential credential = GoogleAuthProvider.credential(
accessToken: googleAuth.accessToken,
idToken: googleAuth.idToken,
);
await _auth.signInWithCredential(credential);
} catch (e) {}
}
The 'updateUserData' function creates a new record for the user when he registers. The DatabaseService class contains all the functions related to Firestore. here it is:
class DatabaseService {
final String uid;
DatabaseService({required this.uid});
// collection reference
final CollectionReference userCollection =
FirebaseFirestore.instance.collection('users');
Future updateUserData(String name, int points) async {
return await userCollection.doc(uid).set({
'name': name,
'points': points,
});
}
}
When you call await _auth.signInWithCredential(credential), you get back a UserCredential, which is the same that you get back from await FirebaseAuth.instance.signInWithEmailAndPassword(...).
So you can get the UID from the UserCredential in both cases with:
var credentials = await _auth.signInWithCredential(credential);
var uid = credentials.user!.uid
If you're listening to auth state changes, then that will fire when you sign in with any provider, and you'll get a User? object. So you can get the UID from that with:
FirebaseAuth.instance
.authStateChanges()
.listen((User? user) {
if (user == null) {
print('User is currently signed out!');
} else {
print('User ${user.uid} is signed in!');
}
});
I am using the below code for google sign in flutter app with firebase, which is working successfully.
How should I check that whether the email id used is already existing in the firebase authentication?
This I need to ensure that I update the user information in the firestore database accordingly.
Future<User> _handleSignIn() async {
User user;
bool userSignedIn = await _googleSignIn.isSignedIn();
setState(() {
isUserSignedIn = userSignedIn;
});
if (isUserSignedIn) {
user = _auth.currentUser;
}
else {
final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
final GoogleSignInAuthentication googleAuth = await googleUser.authentication;
final AuthCredential credential = GoogleAuthProvider.credential(
accessToken: googleAuth.accessToken,
idToken: googleAuth.idToken,
);
user = (await _auth.signInWithCredential(credential)).user;
userSignedIn = await _googleSignIn.isSignedIn();
setState(() {
isUserSignedIn = userSignedIn;
});
}
return user;
}
Please guide me for this
There is a Generic exception related to Firebase Authentication. which is the class FirebaseAuthException. It comes with codes related to errors including email already exists so you would write something like:
try {
//your signIn method here
//i assumed handleSignIn
handleSignIn();
} on FirebaseAuthException catch (e) {
//exception that occurs if e-mail already exists
if (e.code == 'email-already-in-use') {
// the rest of your code here
}
}
Then this is the method you should use I have used to solve my problem
this is my auth.dart file
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:gfd_official/User/User.dart';
import 'package:gfd_official/services/database.dart';
import 'package:google_sign_in/google_sign_in.dart';
String photoUrl;
class AuthService {
final FirebaseAuth _auth = FirebaseAuth.instance;
// create user obj based on firebase user
Userdat _userFromFirebaseUser(User user) {
return user != null ? Userdat(uid: user.uid) : null;
}
// auth change user stream
Stream<Userdat> get user {
return _auth
.authStateChanges()
//.map((FirebaseUser user) => _userFromFirebaseUser(user));
.map(_userFromFirebaseUser);
}
Future signInWithGoogle() async {
GoogleSignIn googleSignIn = GoogleSignIn();
final acc = await googleSignIn.signIn();
final auth = await acc.authentication;
final credential = GoogleAuthProvider.credential(
accessToken: auth.accessToken, idToken: auth.idToken);
try {
final res = await _auth.signInWithCredential(credential);
User user = res.user;
photoUrl = user.photoURL;
UserHelper.saveUser(user);
return _userFromFirebaseUser(user);
} catch (e) {
print(e.toString());
return null;
}
}
Future logOut() {
try {
GoogleSignIn().signOut();
return _auth.signOut();
} catch (e) {
print(e.toString());
return null;
}
}
}
class UserHelper {
static FirebaseFirestore _db = FirebaseFirestore.instance;
static saveUser(User user) async {
Map<String, dynamic> userData = {
"name": user.displayName,
"email": user.email,
"role": "basic",
};
try {
final userRef = _db.collection("users").doc(user.uid);
if ((await userRef.get()).exists) {
await userRef.update({});
} else {
await _db
.collection("users")
.doc(user.uid)
.set(userData, SetOptions(merge: true));
}
} catch (e) {
print(e.toString());
}
}
}
In this the save user function will create database for new user and if user already exist then it will let it remain same as it is.
I am creating a document for every user with his/her uid.
I am trying to add a google sign in to my flutter application, but the method googleSignIn says:
'signInWithGoogle' isn't defined for type 'FirebaseAuth'.
Here is my code
Future<FirebaseUser> handleSignIn() async{
preferences = await SharedPreferences.getInstance();
setState(() {
loading = true;
});
GoogleSignInAccount googleUser = await googleSignIn.signIn();
GoogleSignInAuthentication googleSignInAuthentication = await googleUser.authentication;
FirebaseUser firebaseUser = await firebaseAuth.signInWithGoogle(
idToken: googleSignInAuthentication.idToken,
accessToken: googleSignInAuthentication.accessToken
);
}
From looking at the documentation here that seems correct. The FirebaseAuthclass doesn't have asignInWithGoogle`.
Are you looking for signInWithCredential by any chance?
The example in the FlutterFire repo shows how to use this for Google sign in:
void _signInWithGoogle() async {
final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
final GoogleSignInAuthentication googleAuth =
await googleUser.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(
accessToken: googleAuth.accessToken,
idToken: googleAuth.idToken,
);
final FirebaseUser user =
(await _auth.signInWithCredential(credential)).user;
assert(user.email != null);
assert(user.displayName != null);
assert(!user.isAnonymous);
assert(await user.getIdToken() != null);
final FirebaseUser currentUser = await _auth.currentUser();
assert(user.uid == currentUser.uid);
setState(() {
if (user != null) {
_success = true;
_userID = user.uid;
} else {
_success = false;
}
});
}
}
I have this function that use SignInWithGogle to Sign In/Up an user
void _signInWithGoogle() async {
final GoogleSignInAccount googleUser = await _googleSignIn.signIn();
final GoogleSignInAuthentication googleAuth =
await googleUser.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(
accessToken: googleAuth.accessToken,
idToken: googleAuth.idToken,
);
final FirebaseUser user = (await _auth.signInWithCredential(credential)).user;
assert(user.email != null);
assert(user.displayName != null);
assert(!user.isAnonymous);
assert(await user.getIdToken() != null);
final FirebaseUser currentUser = await _auth.currentUser();
assert(user.uid == currentUser.uid);
print('user email here $user.email');
setState(() {
if (user != null) {
_success = true;
_userID = user.uid;
final userToSubmit = User(
email: user.email,
id: user.uid,
name: user.displayName,
owner: false,
favorites: null);
print('USER ID USER ID USER ID ${user.uid}');
DocumentReference dbRef =
Firestore.instance.collection('users').document(user.uid);
dbRef.get().then((value) {
print('VALUE EXISTS? ${value.exists} y VALUE $value');
value.exists ?
_goToHomeScreen(user)
:
dbRef
.collection('prf')
.document('profile')
.setData(userToSubmit.toJson())
.then(_goToHomeScreen(user));
});
} else {
_success = false;
}
});
}
The problem is that when the user logOut and then login it sets the new Data and the user lost everything they have like favorites and so on... I thought that checking if the document exists should resolve the problem, but despite the document is there exists returns false.
This is the piece of code I'm talking about
DocumentReference dbRef =
Firestore.instance.collection('users').document(user.uid);
dbRef.get().then((value) {
print('VALUE EXISTS? ${value.exists} y VALUE $value');
value.exists ?
_goToHomeScreen(user)
:
dbRef
.collection('prf')
.document('profile')
.setData(userToSubmit.toJson())
.then(_goToHomeScreen(user));
});
}
Why it returns false even if the user.uid and the document exists? What am I doing wrong?
The final solution I implemented is this:
FirebaseUser firebaseUser;
try {
firebaseUser = (await FirebaseAuth.instance.signInWithCredential(credential)).user;
} catch(e) {
print(e.toString());
} finally {
final userToSubmit = User(
email: firebaseUser.email,
id: firebaseUser.uid,
name: firebaseUser.displayName,
owner: false,
restauranteAdded: false);
DocumentReference dbRef =
Firestore.instance.collection('users').document(firebaseUser.uid).collection('nameOfTheCollection').document('documentName');
dbRef.get().then((data) {
data.exists ? _goToHomeScreen(user) :
_createUser();
});
This way I check if user document exists in my Firestore Database and if not it creates it.
There is a lot going on. In general, you're not updating any state object with the setState() method. setState is used to tell a widget that some state has changed--and it's called synchronously with the change, but here where you're just checking to see if a document exists and nothing is changing, it's not needed.
Also it doesn't appear that you're actually returning a user object at all, so this code as I read it will always return false.
You should remove setState here altogether (not needed for what you're doing)
Run a sign in method that returns the user object you want do do things with.
Access your db once you know you have a signed in user (i.e. w/ uid of signed in user)
Here is an option to try:
//Create a User class so that you don't have to call FireBase in your methods.
class User {
User({
#required this.uid,
this.email,
this.displayName,
});
final String uid;
final String email;//these are whatever you want
final String displayName;
}
//put sign in methods into an abstract class. Don't have to, but keeps code flexible if you don't stay with firebase
abstract class AuthBase {
//add in other signin methods as needed
Future<User> signInWithGoogle();
}
//Implement AuthBase in class Auth
class Auth implements AuthBase {
final FirebaseAuth _firebaseAuth = FirebaseAuth.instance;
//Get a User from Firebase User
User _userFromFirebase(FirebaseUser user) {
if (user == null) {
return null;
}
return User(
uid: user.uid,
displayName: user.displayName,
email: user.email,
);
}
//your signinWithGoogle method
Future<User> signInWithGoogle() async {
//where User is the class you've created
GoogleSignIn googleSignIn = GoogleSignIn();
GoogleSignInAccount googleUser = await googleSignIn.signIn();
if (googleUser != null) {
GoogleSignInAuthentication googleAuth = await googleUser.authentication;
if (googleAuth.idToken != null && googleAuth.accessToken != null) {
final authResult = await _firebaseAuth.signInWithCredential( //await your instance of FirebaseAuth
GoogleAuthProvider.getCredential(
idToken: googleAuth.idToken,
accessToken: googleAuth.accessToken,
),
);
return _userFromFirebase(authResult.user); //your signed in firebase user that you can do stuff with uid, email, displayname, etc.
} else {
throw PlatformException(
code: 'ERROR_MISSING_GOOGLE_AUTH_TOKEN',
message: '',
);
}
} else {
throw PlatformException(
code: 'ERROR_ABORTED_BY_USER',
message: '',
);
}
}
I have created login application, using flutter and firebase.
i am doing google login. I have 2 pages login.dart and homepage.dart where everything happens. When i click on login button it asks for choose an account and take me to homepage, but when i logout, and again try to login it takes me automatically to homepage, but i want it to ask again for choosing an account.
I have created signout() function in loginpage itself, where I have written the code for the rest of the authentication, but when I call this function in homepage.dart in logout button, it wont come.
Code for Login Authentication in loginpage.dart
class _LoginPageState extends State<LoginPage> {
String _email;
String _password;
//google sign in
final GoogleSignIn googleSignIn= GoogleSignIn();
final FirebaseAuth _auth = FirebaseAuth.instance;
Future<FirebaseUser> _signIn() async{
//GoogleSignInAccount googleSignInAccount = await googleSignIn.signIn();
GoogleSignInAccount googleUser = await googleSignIn.signIn();
GoogleSignInAuthentication googleAuth = await googleUser.authentication;
final AuthCredential credential = GoogleAuthProvider.getCredential(
idToken: googleAuth.idToken,
accessToken: googleAuth.accessToken,
);
final FirebaseUser user = await _auth.signInWithCredential(credential);
print("User Name: ${user.displayName}");
assert(await user.getIdToken() != null);
final FirebaseUser currentUser = await _auth.currentUser();
assert(user.uid == currentUser.uid);
Navigator.of(context).pushReplacementNamed('/homepage');
}
Future<void> signOut() async {
return googleSignIn.signOut();
}
code for log out button in homepage.dart
MaterialButton(
onPressed: () {
signOut
FirebaseAuth.instance.signOut().then((value) {
Navigator.of(context).pushReplacementNamed('/landingpage');
})
.catchError((e){
print(e);
});
},
child: Text('Log Out'),
)
Please Help me out