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.allowFrom = ["all"];
  services.printing.defaultShared = false;
  services.printing.drivers = [
    pkgs.gutenprint
    pkgs.cups-brother-hl3140cw
  ];

  hardware.sane = {
    enable = true;
    extraBackends = [pkgs.hplipWithPlugin];
  };

  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
      }
    '';
  };
}