nixos/localsend: init module

nixos/modules/module-list.nix

@@ -226,6 +226,7 @@
   ./programs/less.nix
   ./programs/liboping.nix
   ./programs/light.nix
+  ./programs/localsend.nix
   ./programs/mdevctl.nix
   ./programs/mepo.nix
   ./programs/mininet.nix

nixos/modules/programs/localsend.nix

@@ -0,0 +1,24 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.programs.localsend;
+  firewallPort = 53317;
+in
+{
+  options.programs.localsend = {
+    enable = lib.mkEnableOption "localsend, an open source cross-platform alternative to AirDrop";
+
+    openFirewall = lib.mkEnableOption "opening the firewall port ${toString firewallPort} for receiving files" // {
+      default = true;
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.localsend ];
+    networking.firewall.allowedTCPPorts = lib.optionals cfg.openFirewall [ firewallPort ];
+  };
+}