firebase - 使用 Facebook 重新验证用户

Question

我正在使用 Flutter 创建移动应用程序。我正在使用 Firebase 进行身份验证。我的用户使用 Facebook 登录。用户在删除帐户时应重新验证他/她自己。该文档讨论了使用电子邮件和密码重新进行身份验证，如下所示:

// Create a credential
EmailAuthCredential credential = EmailAuthProvider.credential(email: email, password: password);

// Reauthenticate
await FirebaseAuth.instance.currentUser.reauthenticateWithCredential(credential);

由于用户没有电子邮件和密码，而是使用 Facebook 登录，我应该使用 Facebook 重新验证用户。我为此搜索了文档，但没有成功。

谁能告诉我怎么做。

我试图让用户使用 Facebook 登录(即使他已经登录)但没有成功。她是我试过的:

FacebookLoginResult result = await FacebookLogin().logIn(permissions: [
  FacebookPermission.publicProfile,
  FacebookPermission.email,
]);

switch (result.status) {
  case FacebookLoginStatus.success:
    FacebookAccessToken? accessToken = result.accessToken;
    if (accessToken == null) {
      return null;
    }

    UserCredential userCredential = await _auth.signInWithCredential(
      FacebookAuthProvider.credential(accessToken.token),
    );
    return userCredential;

  case FacebookLoginStatus.cancel:
    throw FirebaseAuthException(
      code: 'ERROR_FACEBOOK_LOGIN_FAILED',
      message: result.error?.developerMessage,
    );
  default:
    throw UnimplementedError();
}

await FirebaseAuth.instance.currentUser?.reauthenticateWithCredential(
  userCredential!.credential!,
);

Answer 1

获取 Google 的身份验证凭证

final GoogleSignIn _googleSignIn = GoogleSignIn(
scopes: <String>[
  'email',
  'https://www.googleapis.com/auth/contacts.readonly',
]);

 final GoogleSignInAccount googleSignInAccount =
    await _googleSignIn.signIn();
final GoogleSignInAuthentication googleSignInAuthentication =
    await googleSignInAccount.authentication;

final AuthCredential credential = GoogleAuthProvider.credential(
  accessToken: googleSignInAuthentication.accessToken,
  idToken: googleSignInAuthentication.idToken,
);

获取Apple的认证凭证

final appleIdCredential = await SignInWithApple.getAppleIDCredential(
  scopes: [
    AppleIDAuthorizationScopes.email,
    AppleIDAuthorizationScopes.fullName,
  ],
);
final AuthCredential appleCredential =
    OAuthProvider('apple.com').credential(
  accessToken: appleIdCredential.authorizationCode,
  idToken: appleIdCredential.identityToken,
);