Implémenter une authentification Firebase avec Flutter

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';

class LoginPage extends StatefulWidget {
  const LoginPage({super.key, required this.title});

  final String title;

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final emailController = TextEditingController();
  final passwordController = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(8.0),
          child: Form(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                TextFormField(
                  controller: emailController,
                  decoration: const InputDecoration(hintText: "Email"),
                ),
                TextFormField(
                  controller: passwordController,
                  obscureText: true,
                  decoration: const InputDecoration(hintText: "Password"),
                ),
                const SizedBox(height: 20),
                ElevatedButton(
                  onPressed: () {
                    if (emailController.text.isNotEmpty &&
                        passwordController.text.length > 6) {
                      login();
                    }
                  },
                  child: const Text("Connexion"),
                ),
                TextButton(
                  onPressed: () async {
                    final auth = FirebaseAuth.instance;
                    try {
                      await auth.createUserWithEmailAndPassword(
                        email: emailController.text,
                        password: passwordController.text,
                      );
                    } catch (e) {
                      ScaffoldMessenger.of(context).showSnackBar(
                        SnackBar(content: Text('Erreur: $e')),
                      );
                    }
                  },
                  child: const Text("Inscription"),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  Future<void> login() async {
    final auth = FirebaseAuth.instance;
    try {
      await auth.signInWithEmailAndPassword(
        email: emailController.text,
        password: passwordController.text,
      );
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('Erreur de connexion: $e')),
      );
    }
  }
}

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';

class HomePage extends StatefulWidget {
  const HomePage({super.key, required this.title});

  final String title;

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text("Page d'accueil"),
            ElevatedButton(
              onPressed: () async {
                await FirebaseAuth.instance.signOut();
              },
              child: const Text("Déconnexion"),
            ),
          ],
        ),
      ),
    );
  }
}