[nix] add module.nix

module.nix

@@ -0,0 +1,41 @@
+{config, pkgs, lib, self, system, ... }:
+let
+  cfg = config.services.gatekeeper;
+in
+{
+  options = {
+    services.gatekeeper = {
+      enable = lib.mkEnableOption "Enable the gatekeeper api service.";
+      dotenv = lib.mkOption {
+        type = lib.types.path;
+        default = null;
+        description = "The path to a .env file with the keys";
+      };
+      db = {
+        type = lib.types.path;
+        default = null;
+        description = "Where to save the database.";
+      };
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    users.extraGroups.gatekeeper = {};
+    users.extraUsers.gatekeeper = {
+      description = "gatekeeper user";
+      group = "gatekeeper";
+      isSystemUser = true;
+    };
+    #environment.systemPackages = [self.packages.${system}.default];
+    systemd.services.gatekeeper = {
+      script = ''
+        export LD_LIBRARY_PATH="${lib.getLib pkgs.pcsclite}/lib''${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+            exec ${pkgs.python3.pkgs.uvicorn}/bin/uvicorn run ${self}/app/main.py
+      '';
+      wantedBy = ["multi-user.target"];
+      serviceConfig = {
+        User = "gatekeeper";
+        Restart = "on-failure";
+      };
+    };
+  };
+}