infrastructure/nixos/common/modules/nginx.nix

{ lib, hosts, config, ... }:
with lib;
let cfg = config.services.v.nginx;
in  {
  options.services.v.nginx.autoExpose =
    mkEnableOption "generate vhosts";

  config = let

    proxy = url: {
      enableACME = true;
      forceSSL = true;
      locations."/" = {
        proxyPass = url;
        proxyWebsockets = true;
      };
    };

    hosts' =
      filter (hasAttr "exposes") (attrValues hosts.${config.networking.domain});
    exposes = { ip, exposes, ... }:
      map ({ domain, port ? 80}: { inherit ip domain port; }) (attrValues exposes);
    mkVhost = { ip, domain, port}: {
      "${domain}" = proxy "http://${ip}:${toString port}";
    };
    vhosts = foldr (el: acc: acc // mkVhost el) { } (concatMap exposes hosts');
  in mkIf cfg.autoExpose {
    services.nginx.virtualHosts = vhosts;
  };
}