Firebase Facebook 登录检查用户是否存在 [英] Firebase Facebook login check if user exist

问题描述

我有一个可与 firebase 配合使用的 facebook 登录系统，但我想检查我的 firebase 上是否存在用户(我不想添加它，只是想确定他是否存在，因为我想将用户重定向到另一个页面以完成其配置文件，完成后我想将其发送到 firebase).

I have an facebook login system which works with firebase but I want to check if user exist on my firebase (i don't want to add it, just want to make sure if he exist because I want to redirect user to another page to complete its profile, once its done I'll want to send it to firebase).

我只需要检查用户是否存在于我的数据库中.这是我尝试的代码，但它返回零错误并自动将用户添加到 firebase.

I just need to check if user exist on my db. Here is the code that I try but it returns nil error and it automatically add user to firebase.

let credential = FIRFacebookAuthProvider.credentialWithAccessToken(FBSDKAccessToken.currentAccessToken().tokenString)


FIRAuth.auth()?.signInWithCredential(credential) { (user, error) in
        // ... 

}

推荐答案

您可以使用 reauthenticateWithCredential 方法来检查用户是否存在.

You can use reauthenticateWithCredential method to check user is exist or not.

检查本文档，部分 -> 重新验证用户

Check this Doc. , section -> Re-authenticate a user

let user = FIRAuth.auth()?.currentUser
var credential: FIRAuthCredential

// Prompt the user to re-provide their sign-in credentials

user?.reauthenticateWithCredential(credential) { error in
  if let error = error {
    // An error happened.
  } else {
    // User re-authenticated.
  }
}

如果用户重新认证成功，则表示用户存在...

If user re-authenticated successfully that means user is existed...

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