Can I restrict the number of users signing up on Firebase after a specific number has been reached? For example, if I have already signed up 10 particular users and do not want any more signups, is there a way to prevent future registrations?
Can I restrict the number of users signing up on Firebase after a specific number has been reached? For example, if I have already signed up 10 particular users and do not want any more signups, is there a way to prevent future registrations?
Through thorough investigation, I uncovered a method that is not officially documented but allows for the automatic deletion of new users immediately after they sign up using Cloud Functions and the admin SDK. Below is the code I utilized to ensure that any new user attempting to sign up is promptly deleted:
exports.deleteNewUser = functions.auth.user().onCreate((event) => {
const uid = event.data.uid; // The Firebase user.
admin.auth().deleteUser(uid)
.then(function() {
console.log("Successfully deleted user");
})
.catch(function(error) {
console.log("Error deleting user:", error);
});
});
Update: Additionally, Firebase now offers a revoke token API. This update is crucial because even if a user is deleted immediately upon registration, they are still given a valid token that remains authenticated for a period of time. To address this issue, consider revoking the user's token right after deletion by implementing the following:
admin.auth().revokeRefreshTokens(uid)
.then(() => {
return admin.auth().getUser(uid);
})
If you've come across this post on or after 3/21/21, Firebase has introduced a new feature that allows users to disable user creation and deletion directly on the Identity platform page.
For more information, please visit https://github.com/firebase/firebaseui-web/issues/99#issuecomment-794537000
You no longer have to create an API for managing user authentication in order to control user creation and deletion processes.
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