在授予他们访问应用程序的权限之前，如何在 Flutter 和 Firebase 中验证新用户的电子邮件？

Question

我是 Flutter 的新手，也是开发人员的新手。 我已经查看了有关此主题的数十个 Stackoverflow 答案，阅读了有关验证电子邮件的 FlutterFire 文档并查看了几篇 Medium 文章以寻找答案。 文档写得很好，文章也写得很好，但对于没有经验的开发人员来说，有些事情不容易理解。

我试图让新用户创建一个帐户，收到一封验证电子邮件，然后只有在他们单击 Firebase 发送的验证链接后才被授予访问该应用程序的权限。 我没有收到任何错误，但我的代码中显然存在缺陷。 Firestore 接受并存储新用户信息并发送验证电子邮件，但一旦单击验证链接，用户将保留在验证页面上，而不是导航到主页（在此代码中称为作业页面）。

经过几天的尝试，我无法弄清楚这一点，因此将不胜感激任何帮助。 我已经包含了我的代码的几页。 提前致谢！

abstract class AuthBase {
  User? get currentUser;
  Stream<User?> authStateChanges();

  Future<User?> signInWithEmailAndPassword(String email, String password);
  Future<void> createUserWithEmailAndPasswordVerify(
      String email, String password);
  Future<void> signOut();
}

class Auth implements AuthBase {
  // Value that retrieves an instance of the FirebaseAuth object. This is used for managing users between the app and the Firebase backend
  final _firebaseAuth = FirebaseAuth.instance;

  @override
  Stream<User?> authStateChanges() => _firebaseAuth.authStateChanges();

  @override
  User? get currentUser => _firebaseAuth.currentUser;

  @override
  Future<User?> signInWithEmailAndPassword(
      String email, String password) async {
    final userCredential = await _firebaseAuth.signInWithCredential(
      EmailAuthProvider.credential(
        email: email,
        password: password,
      ),
    );
    return userCredential.user;
  }

  @override
  Future<User?> createUserWithEmailAndPasswordVerify(
      String email, String password) async {
    final userCredential = await _firebaseAuth.createUserWithEmailAndPassword(
      email: email,
      password: password,
    );
    try {
      await userCredential.user?.sendEmailVerification();
    } catch (e) {
      print(
        'An error occurred while trying to send email verification',
      );
    }
    return userCredential.user;
  }

  @override
  Future<void> signOut() async {
    await GoogleSignIn().signOut();
    await _firebaseAuth.signOut();
  }
}


class VerifyPage extends StatefulWidget {
  const VerifyPage({
    Key? key,
  }) : super(key: key);

  @override
  State<VerifyPage> createState() => _VerifyPageState();
}

class _VerifyPageState extends State<VerifyPage> {
  AuthBase? auth;
  Timer? timer;
  User? user;
  bool isUserEmailVerified = false;

  @override
  void initState() {
    super.initState();
    user = auth?.currentUser;
    user?.sendEmailVerification();
    timer = Timer.periodic(
      const Duration(
        seconds: 5,
      ),
      (timer) {
        checkEmailVerified();
      },
    );
  }

  Future<void> checkEmailVerified() async {
    user = auth?.currentUser;
    await user?.reload();
    final signedInUser = user;
    if (signedInUser != null && signedInUser.emailVerified) {
      timer?.cancel();
      Navigator.pushReplacement(
        context,
        MaterialPageRoute(
          builder: (context) => const JobsPage(),
        ),
      );
    }
  }

  @override
  void dispose() {
    timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: Container(),
        title: const Text('Verify Email'),
      ),
      body: const Center(
        child: Padding(
          padding: EdgeInsets.all(16.0),
          child: Text(
            'An email has just been sent to your email.  Click on the link provided to complete registration.',
            style: TextStyle(
              fontSize: 20.0,
            ),
          ),
        ),
      ),
    );
  }
}

来自电子邮件登录表单的代码

Future<void> _submitVerify() async {
    try {
      await model.submitVerify(context);
      Navigator.pushReplacement(
        context,
        MaterialPageRoute(
          builder: (context) => const VerifyPage(),
        ),
      );
    } on FirebaseAuthException catch (e) {
      showExceptionAlertDialog(
        context,
        exception: e,
        title: 'Sign In Failed',
      );
    }
  }

Answer 1

我认为你只是不启动 Auth()

  late AuthBase auth;
  late Timer timer;
  User? user;
  bool isUserEmailVerified = false;

  @override
  void initState() {
    super.initState();
    auth = Auth();
    user = auth.currentUser;
    user?.sendEmailVerification();
    timer = Timer.periodic(
      const Duration(
        seconds: 5,
      ),
          (timer) {
        checkEmailVerified();
      },
    );
  }