{
  config,
  pkgs,
  ...
}:
{
  age.secrets.caddy.file = ../../../secrets/caddy.age;

  services.tailscale.permitCertUid = config.services.caddy.user;

  security.acme.defaults.reloadServices = [ "caddy" ];
  users.groups.acme.members = [ "caddy" ];

  services.caddy = {
    enable = true;
    group = "caddy";
    environmentFile = config.age.secrets.caddy.path;
    package = pkgs.nur.repos.xyenon.caddy.withPlugins {
      plugins = [
        "github.com/caddyserver/cache-handler@v0.16.0"
        "github.com/mholt/caddy-l4@v0.0.0-20260212155620-dd12cc413469"
        "github.com/tailscale/caddy-tailscale@v0.0.0-20260106222316-bb080c4414ac"
      ];
      hash = "sha256-A+wDNJijfD1pnOePXCVMXYzRNxf4Fmpbq2rJG+FMstM=";
    };
    globalConfig = ''
      cache
      servers {
        listener_wrappers {
          layer4 {
            @ssh ssh
            route @ssh {
              proxy localhost:22
            }
            route
          }
          tls
        }
      }
      tailscale {
        tags tag:app
      }
    '';
    virtualHosts = {
      "http://" = {
        # Needed for HTTP->HTTPS servers
      };
      "${config.networking.fqdn}" = {
        serverAliases = [ "https://" ];
        extraConfig = ''
          respond * 204
        '';
      };
    };
  };
  systemd.services.caddy.serviceConfig = {
    UMask = "007";
  };

  users.groups.webservice = {
    members = [ "caddy" ];
  };
  systemd.tmpfiles.rules = [
    # setgid bit (2)
    # sticky bit (4)
    "d /run/web/ 6770 caddy webservice -"
  ];
  systemd.services.caddy.serviceConfig = {
    ReadWritePaths = [ "/run/web" ];
  };
}