# To generate keys:
# dnssec-keygen -K /secret/keys/example.net example.net
{ config, lib, pkgs, ... }:
let
  masterZones = [ "tommvo.com" "orbekk.com" "orbekk.no" "kufieta.net" ];
  zone-files = pkgs.callPackage ../pkgs/zone-files/default.nix { };
in
{
  networking.firewall = {
    allowedTCPPorts = [ 53 ];
    allowedUDPPorts = [ 53 ];
  };

  services.bind = {
    enable = true;
    cacheNetworks = [
      "::1/128"
      "127.0.0.0/24"
      "10.0.0.0/8"
    ];
    extraOptions = ''
      serial-update-method unixtime;
    '';
    extraConfig = ''
      ${lib.concatMapStrings (zone: ''
        zone ${zone} {
          type master;
          file "/var/run/named/db.${zone}.zone";
          auto-dnssec maintain;
	  inline-signing yes;
          sig-validity-interval 21 16;
          key-directory "/opt/secret/bind/${zone}";
          update-policy local;
          allow-query { any; };
          allow-transfer {
            ::1;
            193.35.52.61;               // trygve transfer
            2a00:1b60:1011::6def:e868;  // ns1
            2001:67c:29f4::61;          // ns2
            2604:2000:12c1:c0c6::1000;  // sabaki
          };
          also-notify {
            193.35.52.61;               // trygve transfer
            2a00:1b60:1011::6def:e868;  // ns1
            2001:67c:29f4::61;          // ns2
          };
          notify-source-v6 2001:470:8e2e:20::d;
	  notify explicit;
        };
      '') masterZones}

      include "/opt/secret/bind/dynamic.orbekk.com/update/named.conf.key";
      zone dynamic.orbekk.com {
        type master;
	file "/var/run/named/db.dynamic.orbekk.com.zone";
	auto-dnssec maintain;
	key-directory "/opt/secret/bind/dynamic.orbekk.com";
	allow-query { any; };
        allow-transfer {
          ::1;
          193.35.52.61;               // trygve transfer
          2a00:1b60:1011::6def:e868;  // ns1
          2001:67c:29f4::61;          // ns2
          2604:2000:12c1:c0c6::1000;  // sabaki
        };
        also-notify {
          193.35.52.61;               // trygve transfer
          2a00:1b60:1011::6def:e868;  // ns1
          2001:67c:29f4::61;          // ns2
        };
        notify-source-v6 2001:470:8e2e:20::d;
	notify explicit;
	update-policy {
	  grant dynamic.orbekk.com.key zonesub any;
	};
      };
    '';
  };

  systemd.services.bind = {
    preStart = lib.mkAfter ''
      #rm /var/run/named/*.jnl || true
      #rm /var/run/named/*.jbk || true
      echo "Copy zone files"
      for z in ${zone-files}/*; do
        if [[ $z =~ .*dynamic.* && -e "/var/run/named/$(basename $z)" ]]; then
          echo "Skip dynamic zone $z"
          continue
        fi
        echo "Copy zone $z"
        cp -f $z /var/run/named/
      done
      echo "Done copying zone files"
    '';
  };
}