os/modules/printing/default.nix

{
  flake,
  config,
  pkgs,
  lib,
  ...
}: {
  services.avahi.enable = true;
  services.avahi.ipv6 = true;
  services.avahi.nssmdns = true;
  services.avahi.publish.enable = true;
  services.avahi.publish.userServices = true;

  services.printing.enable = true;
  services.printing.browsing = true;
  services.printing.listenAddresses = ["localhost:631"];
  services.printing.defaultShared = lib.mkDefault false;

  services.printing.drivers =
    [
      pkgs.gutenprint
    ]
    ++ (
      if (pkgs.system == "x86_64-linux")
      then [pkgs.cups-brother-hl3140cw]
      else []
    );

  networking.hosts = flake.self.lib.addLocalHostname ["cups.local"];

  services.caddy = {
    enable = true;
    extraConfig = ''
      cups.local {
        request_header Host localhost:631
        reverse_proxy unix//run/cups/cups.sock
      }
    '';
  };
}