Restrict access to Google Cloud Functions to a given network?

Question

I'm looking through Google Cloud Functions docs and I wonder if it is possible to restrict access to HTTP cloud function to the given network? I would like to avoid anyone to exhaust the free quota.

Is there any firewall rules or similar mechanism for Cloud Functions?

Answer 1

You can add authentication to a cloud function by using firebase authentication. Here's a github example of how to do to it: https://github.com/firebase/functions-samples/tree/master/authorized-https-endpoint

Note however that the authentication code is executed by your function, so rejecting unauthorized access would still consume a small portion of your free resource allowance.