Event triggered when changing a user Firebase Authentication

Question

Detect events from a user Firebase Authentication

In my application developed in Angular along with Node.js and Firebase I need to detect events occurring in users. As inclusion, change and exclusion.

Is there a way to detect when a user is deleted, changed, or inserted through a function created in Cloud Functions?

I know that you can detect database events with a function created in Cloud Functions. I would like to detect when a user is changed, deleted or entered when the operation is done through Firebase Console > Project > Authentication.

Something in that sense:

exports.userChanged = functions.user
  .onCreate((snapshot, context) => {})

OnDelete()
OnCreate()
OnChange()

What is the best way to do this?

Answer 1

There is onCreate and onDelete, you can read it from the docs.

For the update case, you should rely on the RTD. Actually, you could rely completely on the RTD.

//Create a user on the rtd
functions.auth.user().onCreate((user) => {
    return usersRef.child(user.uid).set(user);
});

//Update the user by listening to a change on the RTD
functions.database.ref('/users/{uid}')
    .onWrite((change, context) => {
         //If you needed it you can update the user
         admin.auth().updateUser(uid, {
         });

         //if some condition, then delete it
         admin.auth().deleteUser(uid)

         //do more
    }); 

Using the update user option you can even disable the account, take a look at this other answer

You can use the admin sdk inside of Functions directly, this is the doc