Can you send sign-up link email with Firebase

Question

We are using Firebase on our project and we want only users who recieved an email invitation to be able to access register page and create a profile afterwards. Can you do that using firebase?

Answer 1

There is nothing built into Firebase Authentication to allow only users you've invited to sign up. When the email+password provider is enabled, anyone can call the API and register.

What you can do though is have a list of the invited email addresses in an online database somewhere (such as Firebase's Realtime Database of Firestore) and check against that list whether a user is authorized after they have signed in.

For an example of how to limit access to the database to specific users, have a look at:

• for Realtime Database: How do I lock down Firebase Database to any user from a specific (email) domain?
• for Firestore: Restrict Firestore gmail sign in to specific domain