discord-cc-bridge/flake.nix

{
  inputs.nixpkgs.url = "nixpkgs";

  outputs = {
    self,
    nixpkgs,
    ...
  }: let
    version = builtins.substring 0 7 self.lastModifiedDate;

    systems = [
      "x86_64-linux"
      "aarch64-linux"
      "x86_64-darwin"
      "aarch64-darwin"
    ];

    forAllSystems = nixpkgs.lib.genAttrs systems;
    nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;});

    packageFn = pkgs:
      pkgs.rustPlatform.buildRustPackage {
        pname = "discord-cc-bridge";
        inherit version;

        src = builtins.path {
          name = "source";
          path = ./.;
        };

        cargoSha256 = "sha256-W0GbOUDQtSeMTq1wl15phRPc+cqONjCizumcoi3qoq4=";
      };
  in rec {
    packages = forAllSystems (s: let
      pkgs = nixpkgsFor.${s};
    in rec {
      discord-cc-bridge = packageFn pkgs;
      default = discord-cc-bridge;
    });

    devShells = forAllSystems (s: let
      pkgs = nixpkgsFor.${s};
      inherit (pkgs) mkShell;
    in {
      default = mkShell {
        packages = with pkgs; [rustc cargo rustfmt];
      };
    });

    nixosModules = rec {
      discord-cc-bridge = { config, lib, pkgs, ... }:
      with lib;
      let
        cfg = config.services.discord-cc-bridge;
      in {
        options = {
          services.discord-cc-bridge = {
            enable =
              mkEnableOption "Enable discord-cc-bridge relay server";

            package = mkOption {
              default = packages.${pkgs.system}.discord-cc-bridge;
              type = types.package;
              defaultText = literalExpression "packages.${pkgs.system}.discord-cc-bridge";
              description = lib.mdDoc "discord-cc-bridge derivation to use";
            };

            user = mkOption {
              type = types.str;
              default = "discord-cc-bridge";
              description = lib.mdDoc "User account under which discord-cc-bridge runs.";
            };

            group = mkOption {
              type = types.str;
              default = "discord-cc-bridge";
              description = lib.mdDoc "Group under which discord-cc-bridge runs.";
            };
            
            addr = mkOption {
              type = types.str;
              default = "0.0.0.0:54321";
              description = lib.mdDoc "The socket address to listen to Minecraft connections.";
            };

            discordToken = mkOption {
              type = types.str;
              description = lib.mdDoc "The discord bot token.";
            };

            authToken = mkOption {
              type = types.str;
              description = lib.mdDoc "The auth token used by CC.";
            };

            webhookUrl = mkOption {
              type = types.str;
              description = lib.mdDoc "The webhook URL.";
            };

            channelId = mkOption {
              type = types.str;
              description = lib.mdDoc "The channel id for the bridge.";
            };
          };
        };

        config = mkIf cfg.enable {
          systemd.services.discord-cc-bridge = {
            wantedBy = [ "multi-user.target" ];
            after = [ "network-online.target" ];
            description = "discord-cc-bridge relay server";
            serviceConfig = {
              Type = "simple";
              User = cfg.user;
              Group = cfg.group;
              ExecStart =
                "${cfg.package}/bin/discord-cc-bridge";
            };

            environment = {
              DISCORD_TOKEN = cfg.discordToken;
              BIND_ADDR = cfg.addr;
              AUTH_TOKEN = cfg.authToken;
              WEBHOOK_URL = cfg.webhookUrl;
              CHANNEL_ID = cfg.channelId;
            };
          };

          users.users = mkIf (cfg.user == "discord-cc-bridge") {
            discord-cc-bridge = {
              description = "discord-cc-bridge relay server";
              useDefaultShell = true;
              group = cfg.group;
              isSystemUser = true;
            };
          };

          users.groups = mkIf (cfg.group == "discord-cc-bridge") {
            discord-cc-bridge = {};
          };
        };
      };
      default = discord-cc-bridge;
    };
  };
}