Created
May 14, 2020 08:47
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An example Firebase authentication service class
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import 'package:firebase_auth/firebase_auth.dart'; | |
import 'package:google_sign_in/google_sign_in.dart'; | |
import '../models/user.dart'; | |
class FirebaseAuthService { | |
final FirebaseAuth _firebaseAuth; | |
final GoogleSignIn _googleSignIn; | |
FirebaseAuthService({FirebaseAuth firebaseAuth, GoogleSignIn googleSignin}) | |
: _firebaseAuth = firebaseAuth ?? FirebaseAuth.instance, | |
_googleSignIn = googleSignin ?? GoogleSignIn(); | |
User _userFromFirebase(FirebaseUser user) { | |
if (user == null) { | |
return null; | |
} | |
return User( | |
uid: user.uid, | |
email: user.email, | |
displayName: user.displayName, | |
photoUrl: user.photoUrl, | |
); | |
} | |
Stream<User> get onAuthStateChanged { | |
return _firebaseAuth.onAuthStateChanged.map(_userFromFirebase); | |
} | |
Future<User> signInAnonymously() async { | |
final authResult = await _firebaseAuth.signInAnonymously(); | |
return _userFromFirebase(authResult.user); | |
} | |
Future<User> signInWithGoogle() async { | |
final googleUser = await _googleSignIn.signIn(); | |
final googleAuth = await googleUser.authentication; | |
final credential = GoogleAuthProvider.getCredential( | |
accessToken: googleAuth.accessToken, | |
idToken: googleAuth.idToken, | |
); | |
final authResult = await _firebaseAuth.signInWithCredential(credential); | |
return _userFromFirebase(authResult.user); | |
} | |
Future<void> signOut() async { | |
return _firebaseAuth.signOut(); | |
} | |
Future<User> currentUser() async { | |
final user = await _firebaseAuth.currentUser(); | |
return _userFromFirebase(user); | |
} | |
} |
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