From a47f76d8c03c8f67dc92e45debd814b6aa334c4b Mon Sep 17 00:00:00 2001
From: Henry-Hiles <henry@henryhiles.com>
Date: Mon, 14 Apr 2025 11:55:37 -0400
Subject: [PATCH] WiP livekit

---
 modules/common/livekit.nix | 95 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 modules/common/livekit.nix

diff --git a/modules/common/livekit.nix b/modules/common/livekit.nix
new file mode 100644
index 0000000..d7a4e38
--- /dev/null
+++ b/modules/common/livekit.nix
@@ -0,0 +1,95 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  cfg = config.services.livekit;
+in {
+  services.livekit.enable = true;
+  meta.maintainers = with lib.maintainers; [quadradical];
+  options.services.livekit = {
+    package = lib.mkPackageOption pkgs "livekit" {};
+
+    keyFile = lib.mkOption {
+      type = lib.types.path;
+      description = "LiveKit key file";
+    };
+
+    useExternalIP = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = ''
+        When set to true, attempts to discover the host's public IP via STUN.
+        This is useful for cloud environments such as AWS & Google where hosts have an internal IP that maps to an external one
+      '';
+    };
+
+    port = lib.mkOption {
+      type = lib.types.port;
+      default = 7880;
+      description = "Main TCP port for RoomService and RTC endpoint.";
+    };
+
+    rtc = {
+      portRangeStart = lib.mkOption {
+        type = lib.types.int;
+        default = 50000;
+        description = "Start of UDP port range for WebRTC";
+      };
+
+      portRangeEnd = lib.mkOption {
+        type = lib.types.int;
+        default = 51000;
+        description = "End of UDP port range for WebRTC";
+      };
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.livekit = {
+      description = "LiveKit SFU server";
+      documentation = ["https://docs.livekit.io"];
+      wantedBy = ["multi-user.target"];
+      wants = ["network-online.target"];
+      after = ["network-online.target"];
+
+      serviceConfig = {
+        DynamicUser = true;
+        User = "livekit";
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        PrivateDevices = true;
+        PrivateMounts = true;
+        PrivateUsers = true;
+        RestrictAddressFamilies = [
+          "AF_INET"
+          "AF_INET6"
+        ];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        SystemCallArchitectures = "native";
+        SystemCallFilter = [
+          "@system-service"
+          "~@privileged"
+        ];
+        ExecStart = "${cfg.package}/bin/livekit-server --config=${lib.generators.toJSON {
+          port = cfg.port;
+          rtc = {
+            port_range_start = cfg.rtc.portRangeStart;
+            port_range_end = cfg.rtc.portRangeEnd;
+            use_external_ip = cfg.useExternalIP;
+          };
+        }} --key-file=${cfg.keyFile}";
+        Restart = "on-failure";
+        RestartSec = 5;
+      };
+    };
+  };
+}