{
  pkgs,
  lib,
  config,
  ...
}:
let
  inherit (lib)
    mkEnableOption
    mkIf
    mkOption
    getExe
    ;
  inherit (lib.types)
    pathWith
    listOf
    ;
  cfg = config.xyno.services.oauth2Proxy;
  settingsFormat = pkgs.formats.toml { };
  configFile = settingsFormat.generate "oauth2-proxy.conf" cfg.settings;
  absPath = pathWith {
    inStore = false;
    absolute = true;
  };
in
{
  options.xyno.services.oauth2Proxy = {
    enable = mkEnableOption "oauth2-proxy";
    package = lib.mkPackageOption pkgs "oauth2-proxy" { };
    settings = mkOption {
      type = settingsFormat.type;
      description = "what to add to the config toml file";
    };
    environmentFiles = mkOption {
      type = listOf absPath;
      default = [ ];
      example = [ "/run/secrets/oauth2Proxy" ];
    };
  };
  config = mkIf cfg.enable {
    systemd.services.oauth2-proxy = {
      wantedBy = [ "multi-user.target" ];
      description = "OAuth2 Proxy (66642's less weird version)";
      confinement.enable = true;
      after = [ "network.target" ];
      serviceConfig = {
        BindReadOnlyPaths = [
          "-/etc/resolv.conf"
          "-/run/systemd"
          "/etc/hosts"
          "${config.security.pki.caBundle}:/etc/ssl/certs/ca-certificates.crt"
        ];
        ExecStart = "${getExe cfg.package} --config=${configFile}";
        EnvironmentFile = cfg.environmentFiles;
        DynamicUser = true;
        CapabilityBoundingSet = [ "" ];
        RestrictAddressFamilies = [
          "AF_INET"
          "AF_INET6"
        ];

        PrivateDevices = true;
        UMask = "0022";
        SystemCallFilter = [ "@system-service" ];
        SystemCallErrorNumber = "EPERM";
        LockPersonality = true;
        PrivateTmp = true;
        ProcSubset = "pid";
        ProtectClock = true;
        ProtectControlGroups = true;
        ProtectHome = true;
        ProtectHostname = true;
        ProtectKernelLogs = true;
        ProtectKernelModules = true;
        ProtectKernelTunables = true;
        ProtectProc = "invisible";
        ProtectSystem = "strict";
        RestrictNamespaces = true;
        RestrictRealtime = true;
        RestrictSUIDSGID = true;
        SystemCallArchitectures = "native";
      };
    };
  };
}