Adding Bottom Navigation bar

lib/services/auth/auth.dart

@@ -0,0 +1,13 @@
+
+import 'package:firebase_auth/firebase_auth.dart';
+
+abstract class Auth {
+  Future<User> signInWithGoogle();
+
+  Future<User> signInWithFacebook();
+
+  Future<void> signOut();
+
+  Stream<User> authStateChanges();
+}
+

lib/services/auth/main_auth.dart

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+
+import 'package:le_kiosque_by_gcs/services/auth/auth.dart';
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter_login_facebook/flutter_login_facebook.dart';
+import 'package:google_sign_in/google_sign_in.dart';
+
+class MainAuth implements Auth {
+
+  FirebaseAuth _auth = FirebaseAuth.instance;
+
+  @override
+  Future<User> signInWithGoogle() async {
+    final googleSignIn = GoogleSignIn();
+    final googleUser = await googleSignIn.signIn();
+
+    if (googleUser != null) {
+      final userAuth = await googleUser.authentication;
+      if (userAuth.accessToken != null) {
+        final authCredential = GoogleAuthProvider.credential(
+            accessToken: userAuth.accessToken, idToken: userAuth.idToken);
+        final authResult = await _auth.signInWithCredential(authCredential);
+        return authResult.user;
+      } else {
+        throw FirebaseAuthException(message: "Auth Abord");
+      }
+    } else {
+      throw FirebaseAuthException(message: "Auth Abord");
+    }
+  }
+
+  @override
+  Future<void> signOut() async {
+    final googleSignIn = GoogleSignIn();
+    final facebookAuth = FacebookLogin();
+
+    await facebookAuth.logOut();
+    await googleSignIn.signOut();
+    await _auth.signOut();
+  }
+
+  @override
+  Stream<User> authStateChanges() => _auth.authStateChanges();
+
+  @override
+  Future<User> signInWithFacebook() async {
+    final facebookAuth = FacebookLogin();
+    final result = await facebookAuth.logIn(permissions: [
+      FacebookPermission.publicProfile,
+      FacebookPermission.email
+    ]);
+
+    switch (result.status) {
+      case FacebookLoginStatus.Success:
+        final accessToken = result.accessToken.token;
+        final credential = FacebookAuthProvider.credential(accessToken);
+        final authResult = await _auth.signInWithCredential(credential);
+        return authResult.user;
+        break;
+      case FacebookLoginStatus.Cancel:
+        throw FirebaseAuthException(message: "Auth Abord");
+        break;
+      case FacebookLoginStatus.Error:
+        throw FirebaseAuthException(message: result.error.developerMessage);
+        break;
+      default:
+        throw UnimplementedError();
+    }
+  }
+}