Authentication with Firebase v0.1

lib/authGate.dart

@@ -0,0 +1,63 @@
+import 'package:firebase_auth/firebase_auth.dart';
+import 'package:flutter/material.dart';
+import 'package:flutterfire_ui/auth.dart';
+
+import 'home.dart';
+
+class AuthGate extends StatelessWidget {
+ const AuthGate({super.key});
+
+ @override
+ Widget build(BuildContext context) {
+   return StreamBuilder<User?>(
+     stream: FirebaseAuth.instance.authStateChanges(),
+     builder: (context, snapshot) {
+       if (!snapshot.hasData) {
+         return SignInScreen(
+           providerConfigs: const [
+             EmailProviderConfiguration(),
+             GoogleProviderConfiguration(),
+           ],
+           headerBuilder: (context, constraints, shrinkOffset) {
+             return Padding(
+               padding: const EdgeInsets.all(20),
+               child: AspectRatio(
+                 aspectRatio: 1,
+                 child: Image.asset('flutterfire_300x.png'),
+               ),
+             );
+           },
+           subtitleBuilder: (context, action) {
+             return Padding(
+               padding: const EdgeInsets.symmetric(vertical: 8.0),
+               child: action == AuthAction.signIn
+                   ? const Text('Welcome to FlutterFire, please sign in!')
+                   : const Text('Welcome to Flutterfire, please sign up!'),
+             );
+           },
+           footerBuilder: (context, action) {
+             return const Padding(
+               padding: EdgeInsets.only(top: 16),
+               child: Text(
+                 'By signing in, you agree to our terms and conditions.',
+                 style: TextStyle(color: Colors.grey),
+               ),
+             );
+           },
+           sideBuilder: (context, shrinkOffset) {
+             return Padding(
+               padding: const EdgeInsets.all(20),
+               child: AspectRatio(
+                 aspectRatio: 1,
+                 child: Image.asset('flutterfire_300x.png'),
+               ),
+             );
+           },
+         );
+       }
+
+       return const HomeScreen();
+     },
+   );
+ }
+}