如何确定Firebase用户是否使用Facebook身份验证登录 [英] How to determine if a Firebase user is signed in using facebook authentication

问题描述

我使用的是谷歌的firebase，我有一些用户身份验证的麻烦。使用Facebook登录后，我在AuthStateListener中获取了FirebaseUser，但是如何检测到这个用户是通过Facebook登录还是以不同的方式登录？

更新
As @Frank van Puffelen说FirebaseAuth.getInstance（）。getCurrentUser（）。getProviderId（）
应该返回Facebook，但在我的情况下，它返回firebase。现在我无法弄清楚这是什么原因。当我得到FacebookToken我做这样的事情：

  AuthCredential凭证= FacebookAuthProvider.getCredential（facebookToken.getToken（））; 
 mAuth.signInWithCredential（凭证）
 .addOnCompleteListener（this，new OnCompleteListener< AuthResult>（）{
 @Override 
 public void onComplete（@NonNull Task< AuthResult> task）{ 
 
 //如果登录失败，向用户显示一条消息，如果登录成功
 // auth状态侦听器将被通知，逻辑处理
 // 
 if（！task.isSuccessful（））{
 
} 
 
} 
}）; 
  

在调用onComplete（）方法之前，我的AuthStateListener获取用户的哪个提供者id不是facebook 正如它应当是的样子。我做错了什么？我遵循官方谷歌文档

  FirebaseAuth.getInstance（）。getCurrentUser（）。getProviderId（）
  

它总是会返回 firebase 。

要检测用户是否使用Facebook登录，您必须检查提供者数据：

  for（UserInfo user：FirebaseAuth.getInstance（）。getCurrentUser（）。getProviderData（））{
 if（user.getProviderId（）。equals（facebook.com））{
 System.out。 println（用户使用Facebook登录）; 
} 
} 
  

I am using firebase from google and I have some trouble with user authentication. After logging with facebook I obtain FirebaseUser in AuthStateListener, but how can I detect if this user is logged via facebook or differently?

UPDATE As @Frank van Puffelen said FirebaseAuth.getInstance().getCurrentUser().getProviderId() should return "facebook", but in my case it returns "firebase". Now I cannot figure out what's the reason of this behavior. When I got FacebookToken I do something like this:

        AuthCredential credential = FacebookAuthProvider.getCredential(facebookToken.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {

                        // If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {

                        }

                    }
                });

And afterthat before onComplete() method is called, my AuthStateListener gets user which provider id is not "facebook" as it should be. Am I doing something wrong? I followed official google documentation

解决方案

In version 3.x and later a single user can be signed in with multiple providers. So there is no longer the concept of a single provider ID. In fact when you call:

FirebaseAuth.getInstance().getCurrentUser().getProviderId()

It will always return firebase.

To detect if the user was signed in with Facebook, you will have to inspect the provider data:

for (UserInfo user: FirebaseAuth.getInstance().getCurrentUser().getProviderData()) {
  if (user.getProviderId().equals("facebook.com")) {
    System.out.println("User is signed in with Facebook");
  }
}

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