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}"
    ])
  ];

  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_7;

      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/JIZogEYa/fabric-api-0.128.2%2B1.21.7.jar";
              sha512 = "afb9b3d1040689f53dd51341626b04d197e7d057d578a72c7a374a66465e0e07f5b3d52721d71e36be26d197668d3a96ea50dbb85e2bc5835d9d858e31b15966";
            };

            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/77EtzYFA/lithium-fabric-0.18.0%2Bmc1.21.7.jar";
              sha512 = "afaf6ddaf0cbae2050d725efd438c4c98141d738a637f0f058dcbaff077ef85af801e2dca138ce9f7f8ba3a169dc6af1c9f56736b255c6ea13363f8a1be8ecdb";
            };

            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/Gvw4v06M/squaremap-fabric-mc1.21.7-1.3.7.jar";
              sha512 = "f1e4218ba0146b3dcc63d36ca70e4d1b987e83a4004c5dd1ef0145afb2fb833e3418ae6e86f2fac22e0dfe0ecfdc84fe5a9f52d04b87892b8636d8f8d75379dd";
            };

            scalablelux = fetchurl {
              url = "https://cdn.modrinth.com/data/Ps1zyz6x/versions/UueJNiJn/ScalableLux-0.1.3%2Bbeta.1%2Bfabric.4039a8d-all.jar";
              sha512 = "144dd32f5f7b9c015ae2ff2efc8ba58c561d0fae7a22aba071f0d45f8b3154ae8d23783e9a0308c80eee51857a0ef68191c444830e5da3b44021f03b55a26da2";
            };

            c2me = fetchurl {
              url = "https://cdn.modrinth.com/data/VSNURh3q/versions/Erjpfj2l/c2me-fabric-mc1.21.7-0.3.4%2Bbeta.1.0.jar";
              sha512 = "8942e82c216315198d4752fbb9396e6d59d6447085ce5c00811ba0189765b20acad0153a10532f7ade29f7c090e0299c01802174aa89d4da642bc10f9429998d";
            };

            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/wPYvarTa/spark-1.10.140-fabric.jar";
              sha512 = "595fb359cdecda4afea773aa47a34c7bcfef899abfcfb93f0cd346c6308cb88ad09f87f29606640768c48945da1617a89bc97cdea6d9e916cb47ab1fbec41328";
            };

            # not updated to 1.21.7
            /*
              better-fabric-console = fetchurl {
                url = "https://cdn.modrinth.com/data/Y8o1j1Sf/versions/OexcFHtG/better-fabric-console-mc1.21.5-1.2.3.jar";
                sha512 = "0a5b0da9d6d3c78ed9af66d2bca3976889649942025aecf7f469bea500ce7914070569259332fefb3629b2eb478ee0cfbf85252aaec5d7969727c1668732e8f4";
              };
            */
          }
        );
      };
    };
  };

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

  users.users.${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 minecraft minecraft"
  ];

  users.users.${username}.extraGroups = [
    "minecraft"
  ];
}