server-config/services/minecraft.nix

{
  pkgs,
  service_configs,
  lib,
  username,
  config,
  ...
}:
{
  imports = [
    (lib.serviceMountDeps "minecraft-server-${service_configs.minecraft.server_name}" [
      "${service_configs.minecraft.parent_dir}/${service_configs.minecraft.server_name}"
    ])
    (lib.serviceDependZpool "minecraft-server-${service_configs.minecraft.server_name}" service_configs.zpool_ssds)
  ];

  environment.systemPackages = [
    (pkgs.writeScriptBin "mc-console" ''
      #!/bin/sh
      ${pkgs.tmux}/bin/tmux -S /run/minecraft/${service_configs.minecraft.server_name}.sock attach
    '')
  ];

  nixpkgs.config.allowUnfreePredicate =
    pkg:
    builtins.elem (lib.getName pkg) [
      "minecraft-server"
    ];

  services.minecraft-servers = {
    enable = true;
    eula = true;
    dataDir = service_configs.minecraft.parent_dir;
    openFirewall = true;

    servers.${service_configs.minecraft.server_name} = {
      enable = true;
      package = pkgs.fabricServers.fabric-1_21_8;

      jvmOpts =
        let
          heap_size = "10000M";
        in
        "-Xmx${heap_size} -Xms${heap_size} -XX:+UseZGC -XX:+ZGenerational";

      serverProperties = {
        server-port = 25565;
        enforce-whitelist = true;
        gamemode = "survival";
        white-list = true;
        difficulty = "easy";
        motd = "A Minecraft Server";
        view-distance = 10;
        simulation-distance = 6;
        sync-chunk-writes = false;
        spawn-protection = 0;
      };

      whitelist = import ../secrets/minecraft-whitelist.nix;

      symlinks = {
        "mods" = pkgs.linkFarmFromDrvs "mods" (
          with pkgs;
          builtins.attrValues {
            FabricApi = fetchurl {
              url = "https://cdn.modrinth.com/data/P7dR8mSH/versions/zhzhM2yQ/fabric-api-0.130.0%2B1.21.8.jar";
              sha512 = "27399d629d3fb955c8fc1e5e86cacb9b124814bb97ee7fe283336b0e28f5eb9ae31619814ab4aef70c5beea908d2a1ed5a8dd6b8641a53ecd50375d50067f061";
            };

            FerriteCore = fetchurl {
              url = "https://cdn.modrinth.com/data/uXXizFIs/versions/CtMpt7Jr/ferritecore-8.0.0-fabric.jar";
              sha512 = "131b82d1d366f0966435bfcb38c362d604d68ecf30c106d31a6261bfc868ca3a82425bb3faebaa2e5ea17d8eed5c92843810eb2df4790f2f8b1e6c1bdc9b7745";
            };

            Lithium = fetchurl {
              url = "https://cdn.modrinth.com/data/gvQqBUqZ/versions/pDfTqezk/lithium-fabric-0.18.0%2Bmc1.21.8.jar";
              sha512 = "6c69950760f48ef88f0c5871e61029b59af03ab5ed9b002b6a470d7adfdf26f0b875dcd360b664e897291002530981c20e0b2890fb889f29ecdaa007f885100f";
            };

            NoChatReports = fetchurl {
              url = "https://cdn.modrinth.com/data/qQyHxfxd/versions/LhwpK0O6/NoChatReports-FABRIC-1.21.7-v2.14.0.jar";
              sha512 = "6e93c822e606ad12cb650801be1b3f39fcd2fef64a9bb905f357eb01a28451afddb3a6cadb39c112463519df0a07b9ff374d39223e9bf189aee7e7182077a7ae";
            };

            squaremap = fetchurl {
              url = "https://cdn.modrinth.com/data/PFb7ZqK6/versions/V9xWIMui/squaremap-fabric-mc1.21.8-1.3.8.jar";
              sha512 = "ed32aca04ef0ad6d46549f9309a342624b64857296515037e5531611d43a7f5d4a6b97f6495f76d2ecfdfac9e4f0bf8a66c938c379cdddae59c8a7f2fe0c03f4";
            };

            scalablelux = fetchurl {
              url = "https://cdn.modrinth.com/data/Ps1zyz6x/versions/PQLHDg2Q/ScalableLux-0.1.5%2Bfabric.e4acdcb-all.jar";
              sha512 = "ec8fabc3bf991fbcbe064c1e97ded3e70f145a87e436056241cbb1e14c57ea9f59ef312f24c205160ccbda43f693e05d652b7f19aa71f730caec3bb5f7f7820a";
            };

            c2me = fetchurl {
              url = "https://cdn.modrinth.com/data/VSNURh3q/versions/RzzXyBlx/c2me-fabric-mc1.21.8-0.3.4%2Brc.1.0.jar";
              sha512 = "4addc9ccbc66b547c96152c7fafcaccde47eefa62b0e99a31f7b4ee5844ac738f2557909bd74e1f755ff4835ce13e8ff6c556f8ebda276370912f50ebd054e3a";
            };

            krypton = fetchurl {
              url = "https://cdn.modrinth.com/data/fQEb0iXm/versions/neW85eWt/krypton-0.2.9.jar";
              sha512 = "2e2304b1b17ecf95783aee92e26e54c9bfad325c7dfcd14deebf9891266eb2933db00ff77885caa083faa96f09c551eb56f93cf73b357789cb31edad4939ffeb";
            };

            spark = fetchurl {
              url = "https://cdn.modrinth.com/data/l6YH9Als/versions/3KCl7Vx0/spark-1.10.142-fabric.jar";
              sha512 = "95b7e4f2416e20abf9d9df41fcbce04f28ebf0aa086374742652789a88642dd6820c8884ab240334555345b49c39f7d0caf23d521cec9516991ef43ba24758af";
            };

            better-fabric-console = fetchurl {
              url = "https://cdn.modrinth.com/data/Y8o1j1Sf/versions/DMBZUPjK/better-fabric-console-mc1.21.8-1.2.5.jar";
              sha512 = "d0de1aec66add0158e5a97424a21fc4bd0d26c54457d1bf15cd19e60939ed5d8b4dc4120a6aeec00925723b7dc431a9b84f60ad96d56a9e50620ef34b091cae6";
            };
          }
        );
      };
    };
  };

  services.caddy.virtualHosts = lib.mkIf (config.services.caddy.enable) {
    "map.${service_configs.https.domain}".extraConfig = ''
      root * ${service_configs.minecraft.parent_dir}/${service_configs.minecraft.server_name}/squaremap/web
      file_server browse
    '';
  };

  users.users = lib.mkIf (config.services.caddy.enable) {
    ${config.services.caddy.user}.extraGroups = [
      # for `map.gardling.com`
      "minecraft"
    ];
  };

  systemd.tmpfiles.rules = [
    "d ${service_configs.minecraft.parent_dir}/${service_configs.minecraft.server_name} 0750 ${config.services.minecraft-servers.user} ${config.services.minecraft-servers.group}"
  ];
}