Limit users on nginx using wildcard

Question

I'm starting a work with Nginx to reverse proxy my app for internet access outside my customer's network.

I managed to make it work, limiting the URLs that need to be exposed etc, but one thing is still due to finish my work.

I want to limit user access based on the username. But instead of creating an if for every user I want to block, I would like to use a wildcard because all the users I want to block ends with a specific string: @saspw

Sample of my /etc/nginx/conf.d/reverseproxy.conf

server  {
  listen  80;   # Proxy trafic for SAS Visual Analytics Transport Services on HTTP
  server_name  mcdonalds-va-reverseproxy.cons.sashq-r.openstack.sas.com;
  if ($remote_user = '*@saspw'){
      return 401;
  }
  location  /SASVisualAnalyticsTransport {
    proxy_pass  https://mtbis.mcdonalds.com.au:8343/SASVisualAnalyticsTransport/;
  }
}

In the $remote_user if, I would like that all users with its username ending in @saspw get a 401 error, (which I will change to a 404 later).

It does only work if I put the whole username, like joe@saspw. Using a wildcard (*,?) does not work.

Is there a way to make $remote_user solve wildcards that way?

Thank you, Joe

Limit users on nginx using wildcard

1 Answers