nixos/turn-rs: init

nixos/modules/services/misc/turn-rs.nix

@@ -0,0 +1,86 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.services.turn-rs;
+  format = pkgs.formats.toml { };
+in
+{
+  options.services.turn-rs = {
+    enable = lib.mkEnableOption "turn-rs server";
+    package = lib.mkPackageOption pkgs "turn-rs" { };
+
+    secretFile = lib.mkOption {
+      type = lib.types.nullOr lib.types.path;
+      default = null;
+      example = "/run/keys/turn-rs.env";
+      description = ''
+        Environment variables from this file will be interpolated into the
+        final config file using envsubst with this syntax: `$ENVIRONMENT` or
+        `''${VARIABLE}`.
+        The file should contain lines formatted as `SECRET_VAR=SECRET_VALUE`.
+        This is useful to avoid putting secrets into the nix store.
+      '';
+    };
+
+    settings = lib.mkOption {
+      type = lib.types.submodule {
+        freeformType = format.type;
+      };
+      description = "Turn-rs server config file";
+      default = { };
+      example = {
+        turn = {
+          realm = "localhost";
+          interfaces = [
+            {
+              transport = "udp";
+              bind = "127.0.0.1:3478";
+              external = "127.0.0.1:3478";
+            }
+            {
+              transport = "tcp";
+              bind = "127.0.0.1:3478";
+              external = "127.0.0.1:3478";
+            }
+          ];
+        };
+
+        auth.static_credentials = {
+          user1 = "test";
+          user2 = "test";
+        };
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.turn-rs.settings = {
+      api.bind = lib.mkDefault "127.0.0.1:3000";
+      log.level = lib.mkDefault "info";
+    };
+
+    systemd.services.turn-rs = {
+      enable = true;
+      wantedBy = [ "multi-user.target" ];
+      description = "Turn-rs Server Daemon";
+      preStart =
+        let
+          configFile = format.generate "turn-rs-config.toml" cfg.settings;
+        in
+        ''
+          ${lib.getExe pkgs.envsubst} -i "${configFile}" -o /run/turn-rs/config.toml
+        '';
+      serviceConfig = {
+        RuntimeDirectory = "turn-rs";
+        EnvironmentFile = lib.optional (cfg.secretFile != null) cfg.secretFile;
+        ExecStart = "${lib.getExe cfg.package} --config=/run/turn-rs/config.toml";
+        DynamicUser = true;
+      };
+    };
+  };
+}