hainich: init minecraft server

this server replaces the vanilla minecraft server on libocedrus

hosts/hainich/configuration.nix

@@ -19,6 +19,7 @@
     ./services/syncthing.nix
     ./services/monitoring.nix
     ./services/workadventure.nix
+    ./services/minecraft.nix
   ];
   boot.loader.grub.enable = true;
   boot.loader.grub.version = 2;

hosts/hainich/services/minecraft.nix

@@ -0,0 +1,49 @@
+{pkgs, lib, config, ...}:
+{
+  nixpkgs.config.allowUnfree = true;
+  networking.firewall.allowedTCPPorts = [ 25565 ];
+  services.minecraft-server = {
+    enable = true;
+    eula = true;
+    declarative = true;
+    jvmOpts = "-Xmx1536M -Xms512M";
+
+    serverProperties = {
+      server-port = "25565";
+      gamemode = "survival";
+      motd = "NixCraft4future";
+      max-players = "20";
+      whitelist = true;
+      force-gamemode = true;
+      difficulty = "easy";
+      allow-flight= false;
+      pvp = false;
+      enable-rcon = false;
+    };
+
+    whitelist = {
+      AaronPirt = "bbb8a319-a0fe-4b7a-bdcc-d7941a7fcfa8";
+      ACY2003 = "e6caedfb-95de-44b6-bea7-962e765f2b74";
+      Hexchen = "137ad280-856c-4f27-b258-b263d4e6863b";
+      laXDer = "98043845-8bac-4d38-a479-d116eea90356";
+      Naigh = "96dd9a77-2a65-415b-8d48-1f00e146dc42";
+      Schweby = "a5680c67-1a85-4a9b-81b6-a3a0b7b52467";
+      wolkenzebratopf = "34f47e5b-3f81-4639-ab6b-97be5e358054";
+      yan_min = "a2d1b6f2-1b58-4433-be67-f9872c4332f1";
+      Zauberberg = "4c59c4c3-f16b-4b7e-b707-9a176958e7cf";
+    };
+
+    package = let 
+      version = "16.5-558";
+      url = "https://papermc.io/api/v2/projects/paper/versions/1.16.5/builds/558/downloads/paper-1.16.5-558.jar";
+      sha256 = "24d00dbb162ff5d9aeda0d4969c8050c88ae1e9386c855a98a0f68017e4508e8";
+    in (pkgs.minecraft-server.overrideAttrs (old: rec {
+      name = "minecraft-server-${version}";
+      inherit version;
+
+      src = pkgs.fetchurl {
+        inherit url sha256;
+      };      
+    }));
+  };
+}