package websocket import ( "net/http" "time" "github.com/gorilla/websocket" "github.com/rs/zerolog" "github.com/rs/zerolog/log" "demodesk/neko/internal/types" "demodesk/neko/internal/types/event" "demodesk/neko/internal/types/message" "demodesk/neko/internal/websocket/handler" ) func New( sessions types.SessionManager, desktop types.DesktopManager, capture types.CaptureManager, webrtc types.WebRTCManager, ) *WebSocketManagerCtx { logger := log.With().Str("module", "websocket").Logger() return &WebSocketManagerCtx{ logger: logger, sessions: sessions, desktop: desktop, handler: handler.New(sessions, desktop, capture, webrtc), handlers: []types.HandlerFunction{}, } } // Send pings to peer with this period. Must be less than pongWait. const pingPeriod = 10 * time.Second type WebSocketManagerCtx struct { logger zerolog.Logger sessions types.SessionManager desktop types.DesktopManager handler *handler.MessageHandlerCtx handlers []types.HandlerFunction shutdown chan bool } func (manager *WebSocketManagerCtx) Start() { manager.sessions.OnCreated(func(session types.Session) { if err := manager.handler.SessionCreated(session); err != nil { manager.logger.Warn().Str("session_id", session.ID()).Err(err).Msg("session created with an error") } else { manager.logger.Debug().Str("session_id", session.ID()).Msg("session created") } }) manager.sessions.OnDeleted(func(session types.Session) { if err := manager.handler.SessionDeleted(session); err != nil { manager.logger.Warn().Str("session_id", session.ID()).Err(err).Msg("session deleted with an error") } else { manager.logger.Debug().Str("session_id", session.ID()).Msg("session deleted") } }) manager.sessions.OnConnected(func(session types.Session) { if err := manager.handler.SessionConnected(session); err != nil { manager.logger.Warn().Str("session_id", session.ID()).Err(err).Msg("session connected with an error") } else { manager.logger.Debug().Str("session_id", session.ID()).Msg("session connected") } }) manager.sessions.OnDisconnected(func(session types.Session) { if err := manager.handler.SessionDisconnected(session); err != nil { manager.logger.Warn().Str("session_id", session.ID()).Err(err).Msg("session disconnected with an error") } else { manager.logger.Debug().Str("session_id", session.ID()).Msg("session disconnected") } }) manager.sessions.OnProfileChanged(func(session types.Session) { if err := manager.handler.SessionProfileChanged(session); err != nil { manager.logger.Warn().Str("session_id", session.ID()).Err(err).Msg("session profile changed with an error") } else { manager.logger.Debug().Str("session_id", session.ID()).Msg("session profile changed") } }) manager.sessions.OnStateChanged(func(session types.Session) { if err := manager.handler.SessionStateChanged(session); err != nil { manager.logger.Warn().Str("session_id", session.ID()).Err(err).Msg("session state changed with an error") } else { manager.logger.Debug().Str("session_id", session.ID()).Msg("session state changed") } }) manager.sessions.OnHostChanged(func(session types.Session) { msg := message.ControlHost{ Event: event.CONTROL_HOST, HasHost: session != nil, } if msg.HasHost { msg.HostID = session.ID() } manager.sessions.Broadcast(msg, nil) }) manager.desktop.OnClipboardUpdated(func() { session := manager.sessions.GetHost() if session == nil || !session.Profile().CanAccessClipboard { return } data, err := manager.desktop.ClipboardGetText() if err != nil { manager.logger.Warn().Err(err).Msg("could not get clipboard content") return } if err := session.Send(message.ClipboardData{ Event: event.CLIPBOARD_UPDATED, Text: data.Text, // TODO: Send HTML? }); err != nil { manager.logger.Warn().Err(err).Msg("could not sync clipboard") } }) manager.fileChooserDialogEvents() } func (manager *WebSocketManagerCtx) Shutdown() error { manager.shutdown <- true return nil } func (manager *WebSocketManagerCtx) AddHandler(handler types.HandlerFunction) { manager.handlers = append(manager.handlers, handler) } func (manager *WebSocketManagerCtx) Upgrade(w http.ResponseWriter, r *http.Request, checkOrigin types.CheckOrigin) error { manager.logger.Debug().Msg("attempting to upgrade connection") upgrader := websocket.Upgrader{ CheckOrigin: checkOrigin, } connection, err := upgrader.Upgrade(w, r, nil) if err != nil { manager.logger.Error().Err(err).Msg("failed to upgrade connection") return err } session, err := manager.sessions.Authenticate(r) if err != nil { manager.logger.Warn().Err(err).Msg("authentication failed") // TODO: Refactor, return error code. if err = connection.WriteJSON( message.SystemDisconnect{ Event: event.SYSTEM_DISCONNECT, Message: err.Error(), }); err != nil { manager.logger.Error().Err(err).Msg("failed to send disconnect") } return connection.Close() } if !session.Profile().CanConnect { // TODO: Refactor, return error code. if err = connection.WriteJSON( message.SystemDisconnect{ Event: event.SYSTEM_DISCONNECT, Message: "connection disabled", }); err != nil { manager.logger.Error().Err(err).Msg("failed to send disconnect") } return connection.Close() } if session.State().IsConnected { // TODO: Refactor, return error code. if err = connection.WriteJSON( message.SystemDisconnect{ Event: event.SYSTEM_DISCONNECT, Message: "already connected", }); err != nil { manager.logger.Error().Err(err).Msg("failed to send disconnect") } return connection.Close() } session.SetWebSocketPeer(&WebSocketPeerCtx{ session: session, manager: manager, connection: connection, }) manager.logger. Debug(). Str("session_id", session.ID()). Str("address", connection.RemoteAddr().String()). Msg("connection started") session.SetWebSocketConnected(true) defer func() { manager.logger. Debug(). Str("session_id", session.ID()). Str("address", connection.RemoteAddr().String()). Msg("connection ended") session.SetWebSocketConnected(false) }() manager.handle(connection, session) return nil } func (manager *WebSocketManagerCtx) handle(connection *websocket.Conn, session types.Session) { bytes := make(chan []byte) cancel := make(chan struct{}) ticker := time.NewTicker(pingPeriod) defer ticker.Stop() go func() { for { _, raw, err := connection.ReadMessage() if err != nil { if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) { manager.logger.Warn().Err(err).Msg("read message error") } else { manager.logger.Debug().Err(err).Msg("read message error") } close(cancel) break } bytes <- raw } }() for { select { case raw := <-bytes: manager.logger.Debug(). Str("session_id", session.ID()). Str("address", connection.RemoteAddr().String()). Str("raw", string(raw)). Msg("received message from client") handled := manager.handler.Message(session, raw) for _, handler := range manager.handlers { if handled { break } handled = handler(session, raw) } if !handled { manager.logger.Warn().Msg("unhandled message") } case <-cancel: return case <-ticker.C: if err := connection.WriteMessage(websocket.PingMessage, nil); err != nil { manager.logger.Error().Err(err).Msg("ping message has failed") return } } } }