nixos: services: add aria

modules/nixos/services/aria/default.nix

@@ -0,0 +1,76 @@
+{ config, lib, pkgs, ... }:
+let
+  cfg = config.my.services.aria;
+in
+{
+  options.my.services.aria = with lib; {
+    enable = mkEnableOption "";
+
+    rpcSecretFile = mkOption {
+      type = types.str;
+      example = "/run/secrets/aria-secret.txt";
+      description = ''
+        File containing the RPC secret.
+      '';
+    };
+
+    rpcPort = mkOption {
+      type = types.port;
+      default = 6800;
+      example = 8080;
+      description = "RPC port";
+    };
+
+    downloadDir = mkOption {
+      type = types.str;
+      default = "/data/downloads";
+      example = "/var/lib/transmission/download";
+      description = "Download directory";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    services.aria2 = {
+      enable = true;
+
+      inherit (cfg) downloadDir rpcSecretFile;
+
+      rpcListenPort = cfg.rpcPort;
+      openPorts = false; # I don't want to expose the RPC port
+    };
+
+    # Expose DHT ports
+    networking.firewall = {
+      # FIXME: check for overlap?
+      allowedUDPPortRanges = config.services.aria2.listenPortRange;
+    };
+
+    # Set-up media group
+    users.groups.media = { };
+
+    systemd.services.aria2 = {
+      serviceConfig = {
+        Group = lib.mkForce "media"; # Use 'media' group
+      };
+    };
+
+    my.services.nginx.virtualHosts = {
+      aria = {
+        root = "${pkgs.ariang}/share/ariang";
+        # For paranoia, don't allow anybody to use the UI unauthenticated
+        sso = {
+          enable = true;
+        };
+      };
+      aria-rpc = {
+        port = cfg.rpcPort;
+        # Proxy websockets for RPC
+        extraConfig = {
+          locations."/".proxyWebsockets = true;
+        };
+      };
+    };
+
+    # NOTE: unfortunately aria2 does not log connection failures for fail2ban
+  };
+}

modules/nixos/services/default.nix

@@ -3,6 +3,7 @@
 {
   imports = [
     ./adblock
+    ./aria
     ./backup
     ./blog
     ./calibre-web