Repositories whitelist

Hello!, In an isolated environment I would like to avoid VMs accessing Internet directly to grab updates. I'll probably create a local mirror with The Foreman + Katello, but meanwhile I'll force the use of an HTTP proxy. The proxy I'm using (embedded in OPNsense) allows dynamic whitelists, where the firewall can grab the list from an URL. Are there official repositories lists for OpenSUSE that I could use to feed it?. Regards, CI.-