Firebase Auth 检查 Facebook 上的新用户是否登录 [英] Firebase Auth check if new user on Facebook login

问题描述

我正在创建一个 Web 应用程序，使用 Firebase 身份验证来验证我的用户和一个 MongoDB 数据库来存储一些特定于我的站点的相关用户信息.我正在尝试添加 Facebook 作为另一种身份验证方式.

I am creating a web app using Firebase auth to authenticate my users and a MongoDB database to store some relevant user information specific to my site. I am trying to add Facebook as another means of authentication.

使用 Facebook 登录是有效的，但我想要做的是使用 Firebase 拦截用户生成/身份验证，以检查 Firebase 是否在首次登录 Facebook 时创建新用户.这样，如果在 Firebase 中创建了一个新用户，我也可以在我的 mongo 数据库中创建一个新用户(主要是处理注册).我的 facebook 登录功能如下所示:

Logging in with Facebook is working, but what I want to do is intercept the user generation/authentication with Firebase to check if Firebase is creating a new user on a first-time Facebook login. This way if a new user is being created in Firebase I can also create a new user in my mongo database (essentially handling a signup). My facebook login function looks like this:

handleFacebookLogin() {
 firebase.auth().signInWithPopup(provider).then(function(result) {

  var token = result.credential.accessToken;
  var user = result.user;

  // check if new user here
  // handleNewFacebookUser()

  this.props.update(user);

 }).catch(function(error) {

  var errorCode = error.code;
  var errorMessage = error.message;
  var email = error.email;
  var credential = error.credential;

 });
}

我找不到任何可以让我检查 Firebase 文档中是否正在生成新用户的内容.第一次通过 Facebook 登录时，它似乎默默地处理新的 Firebase 身份验证用户生成.如果 Firebase 没有内置方法来处理这个问题，我只会检查该用户是否存在于我的数据库中，但我想确保没有更简单的替代方法.

I couldn't find anything that allowed me to check if a new user was being generated in the Firebase docs. It seems to silently handle new Firebase auth user generation when logging in through Facebook for the first time. If there is no built-in way for Firebase to handle this I will just check if the user exists in my database, but I wanted to be sure there wasn't a simpler alternative.

推荐答案

您可以通过以下方式检测用户是新用户还是现有用户:

You can detect if a user is new or existing as follows:

firebase.auth().signInWithPopup(provider)
  .then(function(result) {
    console.log(result.additionalUserInfo.isNewUser);
  })
  .catch(function(error) {
    // Handle error.
  });

有关这方面的更多信息，请参阅文档.

For more on this refer to the documentation.

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