os/modules/wireguard-client/default.nix

{
  lib,
  config,
  pkgs,
  ...
}:
with lib; let
  psCfg = config.pub-solar;
  cfg = config.pub-solar.wireguard-client;
in {
  options.pub-solar.wireguard-client = {
    ownIPs = mkOption {
      description = ''
        Internal ips in wireguard used for cluster control-plane communication.
      '';
      type = types.listOf types.str;
    };

    wireguardPrivateKeyFile = mkOption {
      description = ''
        Location of private key file
      '';
      type = types.path;
    };
  };

  config = {
    networking.firewall.allowedUDPPorts = [51899];

    networking.wg-quick.interfaces = {
      wg0 = {
        listenPort = 51899;
        address = cfg.ownIPs;
        dns = [ "10.0.1.2" ];
        privateKeyFile = cfg.wireguardPrivateKeyFile;
        peers = [
          {
            # pie-server
            publicKey = "8M/+y6AqbSsbK0JENkjRXqlRR56iiM/QRjGGtEM+Uj8=";
            allowedIPs = [ "10.0.1.2/32" ];
            endpoint = "[2a02:908:5b1:e3c0:3077:2::]:51898";
            persistentKeepalive = 25;
          }
        ];
      };
    };
  };
}