使用 Flutter 通过社交登录进行身份验证时如何获取用户详细信息？

Question

I am in the middle of creating a Flutter application and am stuck on how to implement authentication using email/password and social providers like Google and Facebook. Everything works except my approach on how to get user details to store in Firebase like address, phone number, username, etc. Implementing this when working with email/password registration has been simple because I created a multi screen form and then finally registered the user which would log them in. The problem with getting additional details when working with social providers is that I would need to authenticate the user first before ever getting the chance to get additional details. How can I go about getting user details for users that choose to use Google and Facebook to authenticate?

Answer 1

One way is to prompt the user to enter the required additional details when the user logs in.

You should first check if the user logged in through a Social Media provider :

List<String> providerList = await FirebaseAuth.instance.fetchSignInMethodsForEmail(_email);

fetchSignInMethodsForEmail will return a list of sign providers the user used to login to your app (if you haven't enabled account linking, this would probably be just one provider)

Here's a list of social media provider ID's :

GoogleAuthProviderID: google.com
FacebookAuthProviderID: facebook.com
TwitterAuthProviderID: twitter.com
GitHubAuthProviderID: github.com
AppleAuthProviderID: apple.com
YahooAuthProviderID: yahoo.com
MicrosoftAuthProviderID: hotmail.com

For example, if you have enabled Facebook login, you can check if the 'facebook.com' is available in the providerList , if so prompt a screen to collect your additional data and update your user record on Firestore for this user.