obs-studio-plugins.obs-websocket: init at 4.9.1-compat

pkgs/applications/video/obs-studio/plugins/default.nix

···
     obs-vkcapture32 = pkgsi686Linux.obs-studio-plugins.obs-vkcapture;
   };
 
-  obs-websocket = throw "obs-websocket has been removed: Functionality has been integrated into obs-studio itself.";
+  obs-websocket = qt6Packages.callPackage ./obs-websocket.nix { }; # Websocket 4.x compatibility for OBS Studio 28+
 
   wlrobs = callPackage ./wlrobs.nix { };
 }

pkgs/applications/video/obs-studio/plugins/obs-websocket.nix

···
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, asio
+, obs-studio
+, qtbase
+, websocketpp
+}:
+
+stdenv.mkDerivation rec {
+  pname = "obs-websocket";
+  version = "4.9.1-compat";
+
+  src = fetchFromGitHub {
+    owner = "obsproject";
+    repo = "obs-websocket";
+    rev = version;
+    sha256 = "sha256-cHsJxoQjwbWLxiHgIa3Es0mu62vyLCAd1wULeZqZsJM=";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ asio obs-studio qtbase websocketpp ];
+
+  dontWrapQtApps = true;
+
+  postInstall = ''
+    mkdir $out/lib $out/share
+    mv $out/obs-plugins/64bit $out/lib/obs-plugins
+    rm -rf $out/obs-plugins
+    mv $out/data $out/share/obs
+  '';
+
+  meta = with lib; {
+    description = "Legacy websocket 4.9.1 protocol support for OBS Studio 28 or above";
+    homepage = "https://github.com/obsproject/obs-websocket";
+    maintainers = with maintainers; [ flexiondotorg ];
+    license = licenses.gpl2Plus;
+    platforms = [ "x86_64-linux" "i686-linux" ];
+  };
+}