flake rework, dep updates

module.nix

@@ -0,0 +1,94 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.services.wifi-prometheus-exporter;
+in {
+  options.services.wifi-prometheus-exporter = {
+    enable = mkEnableOption "WiFi prometheus exporter";
+
+    sshAddress = mkOption {
+      type = types.str;
+      description = "ssh address of the wifi access point";
+    };
+
+    sshKeyFile = mkOption {
+      type = types.str;
+      description = "path containing the ssh private key";
+    };
+
+    sshPubKeyFile = mkOption {
+      type = types.str;
+      description = "path containing the ssh public key";
+    };
+
+    interfaces = mkOption {
+      type = types.listOf types.str;
+      description = "access point interface to expose";
+    };
+
+    port = mkOption {
+      type = types.int;
+      default = 9010;
+      description = "port to listen to";
+    };
+
+    mqttSecretFile = mkOption {
+      type = types.str;
+      description = "path containing MQTT_HOSTNAME, MQTT_USERNAME and MQTT_PASSWORD environment variables";
+    };
+
+    package = mkOption {
+      type = types.package;
+      defaultText = literalExpression "pkgs.dispenser";
+      description = "package to use";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.services."wifi-prometheus-exporter" = {
+      wantedBy = ["multi-user.target"];
+      environment = {
+        PORT = toString cfg.port;
+        ADDR = cfg.sshAddress;
+        KEYFILE = cfg.sshKeyFile;
+        PUBFILE = cfg.sshPubKeyFile;
+        INTERFACES = concatStringsSep " " cfg.interfaces;
+      };
+
+      serviceConfig = {
+        ExecStart = "${pkgs.wifi-prometheus-exporter}/bin/wifi-prometheus-exporter";
+        EnvironmentFile = cfg.mqttSecretFile;
+        Restart = "on-failure";
+        DynamicUser = true;
+        PrivateTmp = true;
+        ProtectSystem = "strict";
+        ProtectHome = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        ProtectClock = true;
+        CapabilityBoundingSet = true;
+        ProtectKernelLogs = true;
+        ProtectControlGroups = true;
+        SystemCallArchitectures = "native";
+        ProtectKernelModules = true;
+        RestrictNamespaces = true;
+        MemoryDenyWriteExecute = true;
+        ProtectHostname = true;
+        LockPersonality = true;
+        ProtectKernelTunables = true;
+        RestrictAddressFamilies = "AF_INET AF_INET6";
+        RestrictRealtime = true;
+        ProtectProc = "noaccess";
+        SystemCallFilter = ["@system-service" "~@resources" "~@privileged"];
+        IPAddressDeny = "any";
+        IPAddressAllow = ["192.168.0.0/16" "localhost"];
+        PrivateUsers = true;
+        ProcSubset = "pid";
+      };
+    };
+  };
+}