initial version

nix/module.nix

@@ -0,0 +1,110 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  format = pkgs.formats.toml {};
+  cfg = config.services.lightflash;
+  configFile = format.generate "lightflash.toml" {
+    mqtt = {
+      inherit (cfg.mqtt) hostname username;
+      password_file = "$CREDENTIALS_DIRECTORY/mqtt_password";
+    };
+    switch = cfg.switches;
+  };
+in {
+  options.services.lightflash = {
+    enable = mkEnableOption "Enables the lightflash service";
+
+    mqtt = mkOption {
+      type = types.submodule {
+        options = {
+          hostname = mkOption {
+            type = types.str;
+            description = "mqtt server hostname";
+          };
+          username = mkOption {
+            type = types.str;
+            description = "mqtt username";
+          };
+          passwordFile = mkOption {
+            type = types.str;
+            description = "path containing the mqtt password";
+          };
+        };
+      };
+    };
+
+    switches = mkOption {
+      description = "configured triggers";
+      type = types.listOf (types.submodule {
+        options = {
+          name = mkOption {
+            type = types.str;
+            description = "switch to listen on";
+          };
+          lights = mkOption {
+            type = types.listOf types.str;
+            description = "lights to flash";
+          };
+        };
+      });
+    };
+
+    package = mkOption {
+      type = types.package;
+      description = "package to use";
+    };
+
+    logLevel = mkOption {
+      type = types.str;
+      default = "INFO";
+      description = "log level";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services.lightflash = {
+      wantedBy = ["multi-user.target"];
+
+      environment = {
+        RUST_LOG = cfg.logLevel;
+      };
+
+      serviceConfig = {
+        LoadCredential = [
+          "mqtt_password:${cfg.mqtt.passwordFile}"
+        ];
+
+        Restart = "on-failure";
+        ExecStart = "${getExe cfg.package} --config ${configFile}";
+        DynamicUser = true;
+        PrivateUsers = true;
+        PrivateTmp = true;
+        ProtectSystem = "strict";
+        ProtectHome = true;
+        NoNewPrivileges = true;
+        ProtectClock = true;
+        CapabilityBoundingSet = true;
+        ProtectControlGroups = true;
+        SystemCallArchitectures = "native";
+        ProtectKernelModules = true;
+        ProtectKernelLogs = true;
+        ProtectKernelTunables = true;
+        ProtectHostname = true;
+        LockPersonality = true;
+        ProtectProc = "invisible";
+        PrivateDevices = true;
+        RestrictAddressFamilies = ["AF_LOCAL" "AF_INET"];
+        RestrictRealtime = true;
+        SystemCallFilter = ["~@reboot" "~@cpu-emulation" "~@obsolete" "~@debug" "~@swap" "~@clock" "~@module"];
+        IPAddressDeny = ["any"];
+        IPAddressAllow = ["localhost"];
+        UMask = "0007";
+        RuntimeDirectory = "lightflash";
+      };
+    };
+  };
+}