♻️ FFI windows rpc ipc implmentation

lib/pods/activity_rpc.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'dart:developer' as developer;
+import 'dart:ffi';
 import 'dart:io';
 import 'package:flutter/foundation.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
@@ -10,6 +11,9 @@ import 'package:shelf/shelf_io.dart' as shelf_io;
 import 'package:shelf_web_socket/shelf_web_socket.dart';
 import 'package:web_socket_channel/web_socket_channel.dart';
 import 'package:path/path.dart' as path;
+import 'package:win32/win32.dart';
+import 'package:win32/winsock2.dart' as winsock2;
+import 'package:ffi/ffi.dart';
 
 const String kRpcLogPrefix = 'arRPC.websocket';
 const String kRpcIpcLogPrefix = 'arRPC.ipc';
@@ -43,12 +47,13 @@ class IpcErrorCodes {
   static const int invalidEncoding = 4005;
 }
 
+// Reference https://github.com/OpenAsar/arrpc/blob/main/src/transports/ipc.js
 class ActivityRpcServer {
   static const List<int> portRange = [6463, 6472]; // Ports 6463–6472
-  Map<String, Function>
+  Map<String, Function> handlers; // {connection: (socket), message: (socket, data), close: (socket)}
-  handlers; // {connection: (socket), message: (socket, data), close: (socket)}
   HttpServer? _httpServer;
   ServerSocket? _ipcServer;
+  int? _pipeHandle; // For Windows named pipe
   final List<WebSocketChannel> _wsSockets = [];
   final List<_IpcSocketWrapper> _ipcSockets = [];
 
@@ -79,10 +84,7 @@ class ActivityRpcServer {
 
   // Find available IPC socket path
   Future<String> _findAvailableIpcPath() async {
-    if (Platform.isWindows) {
+    if (Platform.isWindows) return r'\\.\pipe\discord-ipc';
-      // Use TCP sockets on Windows for IPC (simpler and more compatible)
-      return _findAvailableTcpPort();
-    }
 
     // Build list of directories to try, with macOS-specific handling
     final baseDirs = <String>[];
@@ -103,11 +105,11 @@ class ActivityRpcServer {
 
     // Add other standard directories
     final otherDirs = [
-      Platform.environment['XDG_RUNTIME_DIR'], // User runtime directory
+      Platform.environment['XDG_RUNTIME_DIR'],
-      Platform.environment['TMPDIR'], // App container temp (fallback)
+      Platform.environment['TMPDIR'],
       Platform.environment['TMP'],
       Platform.environment['TEMP'],
-      '/tmp', // System temp directory - most compatible
+      '/tmp',
     ];
 
     baseDirs.addAll(
@@ -123,7 +125,6 @@ class ActivityRpcServer {
             0,
           );
           socket.close();
-          // Clean up the test socket
           try {
             await File(socketPath).delete();
           } catch (_) {}
@@ -133,9 +134,7 @@ class ActivityRpcServer {
           );
           return socketPath;
         } catch (e) {
-          // Path not available, try next
           if (i == 0) {
-            // Log only for the first attempt per directory
             developer.log(
               'IPC path $socketPath not available: $e',
               name: kRpcIpcLogPrefix,
@@ -150,36 +149,7 @@ class ActivityRpcServer {
     );
   }
 
-  // Find available TCP port for Windows IPC
+  // Start the server
-  Future<String> _findAvailableTcpPort() async {
-    // Use ports in the range 6473-6482 (different from WebSocket server range 6463-6472)
-    for (int port = 6473; port <= 6482; port++) {
-      try {
-        final socket = await ServerSocket.bind(
-          InternetAddress.loopbackIPv4,
-          port,
-        );
-        socket.close();
-        developer.log(
-          'IPC TCP socket will be created on port: $port',
-          name: kRpcIpcLogPrefix,
-        );
-        return port.toString(); // Return as string to match existing interface
-      } catch (e) {
-        // Port not available, try next
-        if (port == 6473) {
-          developer.log(
-            'IPC TCP port $port not available: $e',
-            name: kRpcIpcLogPrefix,
-          );
-        }
-        continue;
-      }
-    }
-    throw Exception('No available IPC TCP ports found');
-  }
-
-  // Start the WebSocket server
   Future<void> start() async {
     int port = portRange[0];
     bool wsSuccess = false;
@@ -188,11 +158,9 @@ class ActivityRpcServer {
     while (port <= portRange[1]) {
       developer.log('trying port $port', name: kRpcLogPrefix);
       try {
-        // Start HTTP server
         _httpServer = await HttpServer.bind(InternetAddress.loopbackIPv4, port);
         developer.log('listening on $port', name: kRpcLogPrefix);
 
-        // Handle WebSocket upgrades
         shelf_io.serveRequests(_httpServer!, (Request request) async {
           developer.log('new request', name: kRpcLogPrefix);
           if (request.headers['upgrade']?.toLowerCase() == 'websocket') {
@@ -212,7 +180,6 @@ class ActivityRpcServer {
         break;
       } catch (e) {
         if (e is SocketException && e.osError?.errorCode == 98) {
-          // EADDRINUSE
           developer.log('$port in use!', name: kRpcLogPrefix);
         } else {
           developer.log('http error: $e', name: kRpcLogPrefix);
@@ -227,47 +194,123 @@ class ActivityRpcServer {
       );
     }
 
-    // Start IPC server (skip on macOS due to sandboxing)
+    // Start IPC server
-    final shouldStartIpc = !Platform.isMacOS;
+    final shouldStartIpc = !Platform.isMacOS && !kIsWeb;
     if (shouldStartIpc) {
-      try {
       if (Platform.isWindows) {
-          // Use TCP socket on Windows
+        await _startWindowsIpcServer();
-          final ipcPortStr = await _findAvailableIpcPath();
-          final ipcPort = int.parse(ipcPortStr);
-          _ipcServer = await ServerSocket.bind(
-            InternetAddress.loopbackIPv4,
-            ipcPort,
-          );
-          developer.log(
-            'IPC listening on TCP port $ipcPort',
-            name: kRpcIpcLogPrefix,
-          );
       } else {
-          // Use Unix socket on other platforms
+        try {
           final ipcPath = await _findAvailableIpcPath();
           _ipcServer = await ServerSocket.bind(
             InternetAddress(ipcPath, type: InternetAddressType.unix),
             0,
           );
           developer.log('IPC listening at $ipcPath', name: kRpcIpcLogPrefix);
-        }
 
           _ipcServer!.listen((Socket socket) {
             _onIpcConnection(socket);
           });
         } catch (e) {
           developer.log('IPC server error: $e', name: kRpcIpcLogPrefix);
-        // Continue without IPC if it fails
+        }
       }
     } else {
       developer.log(
-        'IPC server disabled on macOS due to sandboxing',
+        'IPC server disabled on macOS or web in production mode',
         name: kRpcIpcLogPrefix,
       );
     }
   }
 
+  // Start Windows-specific IPC server using Winsock2 named pipe
+  Future<void> _startWindowsIpcServer() async {
+    final pipeName = r'\\.\pipe\discord-ipc'.toNativeUtf16();
+    try {
+      _pipeHandle = CreateNamedPipe(
+        pipeName,
+        PIPE_ACCESS_DUPLEX,
+        PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT,
+        PIPE_UNLIMITED_INSTANCES,
+        4096, // Output buffer size
+        4096, // Input buffer size
+        0, // Default timeout
+        nullptr, // Security attributes
+      );
+
+      if (_pipeHandle == INVALID_HANDLE_VALUE) {
+        final error = GetLastError();
+        throw Exception('Failed to create named pipe: error code $error');
+      }
+
+      developer.log('IPC named pipe created at \\\\.\\pipe\\discord-ipc', name: kRpcIpcLogPrefix);
+
+      // Start listening for connections in a separate isolate or async loop
+      _listenWindowsIpc();
+    } finally {
+      free(pipeName);
+    }
+  }
+
+  // Listen for Windows IPC connections
+  void _listenWindowsIpc() {
+    Timer.periodic(Duration(milliseconds: 100), (timer) async {
+      if (_pipeHandle == null || _pipeHandle == INVALID_HANDLE_VALUE) {
+        timer.cancel();
+        return;
+      }
+
+      final connected = ConnectNamedPipe(_pipeHandle!, nullptr);
+      if (connected != 0 || GetLastError() == ERROR_PIPE_CONNECTED) {
+        final socketWrapper = _IpcSocketWrapper(_pipeHandle!);
+        _ipcSockets.add(socketWrapper);
+        developer.log('New IPC connection on named pipe', name: kRpcIpcLogPrefix);
+
+        // Handle data reading in a separate async function
+        _handleWindowsIpcData(socketWrapper);
+
+        // Create a new pipe for the next connection
+        await _startWindowsIpcServer();
+      }
+    });
+  }
+
+  // Handle Windows IPC data
+  void _handleWindowsIpcData(_IpcSocketWrapper socket) async {
+    final buffer = malloc.allocate<Uint8>(4096);
+    final bytesRead = malloc.allocate<Uint32>(sizeOf<Uint32>());
+    try {
+      while (socket.pipeHandle != null) {
+        final success = ReadFile(
+          socket.pipeHandle!,
+          buffer.cast(),
+          4096,
+          bytesRead,
+          nullptr,
+        );
+
+        if (success == FALSE && GetLastError() != ERROR_MORE_DATA) {
+          developer.log('IPC read error: ${GetLastError()}', name: kRpcIpcLogPrefix);
+          socket.close();
+          break;
+        }
+
+        final data = buffer.asTypedList(bytesRead.value);
+        socket.addData(data);
+        final packets = socket.readPackets();
+        for (final packet in packets) {
+          _handleIpcPacket(socket, packet);
+        }
+      }
+    } catch (e) {
+      developer.log('IPC data error: $e', name: kRpcIpcLogPrefix);
+      socket.closeWithCode(IpcCloseCodes.closeUnsupported, e.toString());
+    } finally {
+      malloc.free(buffer);
+      malloc.free(bytesRead);
+    }
+  }
+
   // Stop the server
   Future<void> stop() async {
     // Stop WebSocket server
@@ -282,6 +325,10 @@ class ActivityRpcServer {
       socket.close();
     }
     _ipcSockets.clear();
+    if (Platform.isWindows && _pipeHandle != null) {
+      CloseHandle(_pipeHandle!);
+      _pipeHandle = null;
+    }
     await _ipcServer?.close();
 
     developer.log('servers stopped', name: kRpcLogPrefix);
@@ -289,7 +336,6 @@ class ActivityRpcServer {
 
   // Handle new WebSocket connection
   void _onWsConnection(WebSocketChannel socket, Request request) {
-    // Parse query parameters
     final uri = request.url;
     final params = uri.queryParameters;
     final ver = int.tryParse(params['v'] ?? '1') ?? 1;
@@ -302,7 +348,6 @@ class ActivityRpcServer {
       name: kRpcLogPrefix,
     );
 
-    // Validate origin
     if (origin.isNotEmpty &&
         ![
           'https://discord.com',
@@ -314,7 +359,6 @@ class ActivityRpcServer {
       return;
     }
 
-    // Validate encoding
     if (encoding != 'json') {
       developer.log(
         'unsupported encoding requested: $encoding',
@@ -324,17 +368,14 @@ class ActivityRpcServer {
       return;
     }
 
-    // Validate version
     if (ver != 1) {
       developer.log('unsupported version requested: $ver', name: kRpcLogPrefix);
       socket.sink.close();
       return;
     }
 
-    // Store client info on socket
     final socketWithMeta = _WsSocketWrapper(socket, clientId, encoding);
 
-    // Set up event listeners
     socket.stream.listen(
       (data) => _onWsMessage(socketWithMeta, data),
       onError: (e) {
@@ -347,7 +388,6 @@ class ActivityRpcServer {
       },
     );
 
-    // Notify handler of new connection
     handlers['connection']?.call(socketWithMeta);
   }
 
@@ -355,10 +395,9 @@ class ActivityRpcServer {
   void _onIpcConnection(Socket socket) {
     developer.log('new IPC connection!', name: kRpcIpcLogPrefix);
 
-    final socketWrapper = _IpcSocketWrapper(socket);
+    final socketWrapper = _IpcSocketWrapper.fromSocket(socket);
     _ipcSockets.add(socketWrapper);
 
-    // Set up event listeners
     socket.listen(
       (data) => _onIpcData(socketWrapper, data),
       onError: (e) {
@@ -408,7 +447,6 @@ class ActivityRpcServer {
 
       case IpcTypes.pong:
         developer.log('IPC pong received', name: kRpcIpcLogPrefix);
-        // Handle pong if needed
         break;
 
       case IpcTypes.handshake:
@@ -443,7 +481,6 @@ class ActivityRpcServer {
     final ver = int.tryParse(params['v']?.toString() ?? '1') ?? 1;
     final clientId = params['client_id']?.toString() ?? '';
 
-    // Validate version
     if (ver != 1) {
       developer.log(
         'IPC unsupported version requested: $ver',
@@ -453,7 +490,6 @@ class ActivityRpcServer {
       return;
     }
 
-    // Validate client ID
     if (clientId.isEmpty) {
       developer.log('IPC client ID required', name: kRpcIpcLogPrefix);
       socket.closeWithCode(IpcErrorCodes.invalidClientId);
@@ -462,7 +498,6 @@ class ActivityRpcServer {
 
     socket.clientId = clientId;
 
-    // Notify handler of new connection
     handlers['connection']?.call(socket);
   }
 }
@@ -483,12 +518,14 @@ class _WsSocketWrapper {
 
 // IPC wrapper
 class _IpcSocketWrapper {
-  final Socket socket;
+  final Socket? socket;
+  final int? pipeHandle;
   String clientId = '';
   bool handshook = false;
   final List<int> _buffer = [];
 
-  _IpcSocketWrapper(this.socket);
+  _IpcSocketWrapper(this.pipeHandle) : socket = null;
+  _IpcSocketWrapper.fromSocket(this.socket) : pipeHandle = null;
 
   void addData(List<int> data) {
     _buffer.addAll(data);
@@ -497,23 +534,82 @@ class _IpcSocketWrapper {
   void send(Map<String, dynamic> msg) {
     developer.log('IPC sending: $msg', name: kRpcIpcLogPrefix);
     final packet = ActivityRpcServer.encodeIpcPacket(IpcTypes.frame, msg);
-    socket.add(packet);
+    if (Platform.isWindows && pipeHandle != null) {
+      final buffer = malloc.allocate<Uint8>(packet.length);
+      buffer.asTypedList(packet.length).setAll(0, packet);
+      final bytesWritten = malloc.allocate<Uint32>(sizeOf<Uint32>());
+      try {
+        WriteFile(
+          pipeHandle!,
+          buffer.cast(),
+          packet.length,
+          bytesWritten,
+          nullptr,
+        );
+      } finally {
+        malloc.free(buffer);
+        malloc.free(bytesWritten);
+      }
+    } else {
+      socket?.add(packet);
+    }
   }
 
   void sendPong(dynamic data) {
     final packet = ActivityRpcServer.encodeIpcPacket(IpcTypes.pong, data ?? {});
-    socket.add(packet);
+    if (Platform.isWindows && pipeHandle != null) {
+      final buffer = malloc.allocate<Uint8>(packet.length);
+      buffer.asTypedList(packet.length).setAll(0, packet);
+      final bytesWritten = malloc.allocate<Uint32>(sizeOf<Uint32>());
+      try {
+        WriteFile(
+          pipeHandle!,
+          buffer.cast(),
+          packet.length,
+          bytesWritten,
+          nullptr,
+        );
+      } finally {
+        malloc.free(buffer);
+        malloc.free(bytesWritten);
+      }
+    } else {
+      socket?.add(packet);
+    }
   }
 
   void close() {
-    socket.close();
+    if (Platform.isWindows && pipeHandle != null) {
+      CloseHandle(pipeHandle!);
+    } else {
+      socket?.close();
+    }
   }
 
   void closeWithCode(int code, [String message = '']) {
     final closeData = {'code': code, 'message': message};
     final packet = ActivityRpcServer.encodeIpcPacket(IpcTypes.close, closeData);
-    socket.add(packet);
+    if (Platform.isWindows && pipeHandle != null) {
-    socket.close();
+      final buffer = malloc.allocate<Uint8>(packet.length);
+      buffer.asTypedList(packet.length).setAll(0, packet);
+      final bytesWritten = malloc.allocate<Uint32>(sizeOf<Uint32>());
+      try {
+        WriteFile(
+          pipeHandle!,
+          buffer.cast(),
+          packet.length,
+          bytesWritten,
+          nullptr,
+        );
+      } finally {
+        malloc.free(buffer);
+        malloc.free(bytesWritten);
+      }
+      CloseHandle(pipeHandle!);
+    } else {
+      socket?.add(packet);
+      socket?.close();
+    }
   }
 
   List<_IpcPacket> readPackets() {
@@ -571,7 +667,6 @@ class ServerStateNotifier extends StateNotifier<ServerState> {
       : super(ServerState(status: 'Server not started'));
 
   Future<void> start() async {
-    // Only start server on desktop platforms
     if (!Platform.isAndroid && !Platform.isIOS && !kIsWeb) {
       try {
         await server.start();
@@ -605,7 +700,6 @@ final rpcServerStateProvider =
               ? socket.clientId
               : (socket as _IpcSocketWrapper).clientId;
       notifier.updateStatus('Client connected (ID: $clientId)');
-          // Send READY event
       socket.send({
         'cmd': 'DISPATCH',
         'data': {
@@ -624,7 +718,7 @@ final rpcServerStateProvider =
           },
         },
         'evt': 'READY',
-            'nonce': '12345', // Should be dynamic
+        'nonce': '12345',
       });
     },
     'message': (socket, dynamic data) async {
@@ -632,7 +726,6 @@ final rpcServerStateProvider =
         notifier.addActivity(
           'Activity: ${data['args']['activity']['details'] ?? 'Unknown'}',
         );
-            // Call setRemoteActivityStatus
         final label = data['args']['activity']['details'] ?? 'Unknown';
         final appId = socket.clientId;
         try {
@@ -643,7 +736,6 @@ final rpcServerStateProvider =
             name: kRpcLogPrefix,
           );
         }
-            // Echo back success
         socket.send({
           'cmd': 'SET_ACTIVITY',
           'data': data['args']['activity'],