first commit

server/go.mod

@@ -0,0 +1,7 @@
+module server
+
+go 1.25.5
+
+require github.com/gorilla/websocket v1.5.3
+
+require github.com/joho/godotenv v1.5.1 // indirect

server/go.sum

@@ -0,0 +1,4 @@
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=

server/server.go

@@ -0,0 +1,165 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"sync"
+
+	"github.com/gorilla/websocket"
+)
+
+var upgrader = websocket.Upgrader{
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}
+
+type Client struct {
+	conn           *websocket.Conn
+	identification string
+	send           chan []byte
+}
+
+type Server struct {
+	clients    map[*Client]bool
+	register   chan *Client
+	unregister chan *Client
+	broadcast  chan *Message
+	mu         sync.RWMutex
+}
+
+type Message struct {
+	identification string
+	data           []byte
+	sender         *Client
+}
+
+func newServer() *Server {
+	return &Server{
+		clients:    make(map[*Client]bool),
+		register:   make(chan *Client),
+		unregister: make(chan *Client),
+		broadcast:  make(chan *Message),
+	}
+}
+
+func (s *Server) run() {
+	for {
+		select {
+		case client := <-s.register:
+			s.mu.Lock()
+			s.clients[client] = true
+			s.mu.Unlock()
+			log.Printf("Client registered with identification: %s", client.identification)
+
+		case client := <-s.unregister:
+			s.mu.Lock()
+			if _, ok := s.clients[client]; ok {
+				delete(s.clients, client)
+				close(client.send)
+				log.Printf("Client unregistered: %s", client.identification)
+			}
+			s.mu.Unlock()
+
+		case message := <-s.broadcast:
+			s.mu.RLock()
+			for client := range s.clients {
+				if client.identification == message.identification && client != message.sender {
+					select {
+					case client.send <- message.data:
+					default:
+						close(client.send)
+						delete(s.clients, client)
+					}
+				}
+			}
+			s.mu.RUnlock()
+		}
+	}
+}
+
+func (c *Client) readPump(server *Server) {
+	defer func() {
+		server.unregister <- c
+		c.conn.Close()
+	}()
+
+	for {
+		_, message, err := c.conn.ReadMessage()
+		if err != nil {
+			if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
+				log.Printf("error: %v", err)
+			}
+			break
+		}
+		log.Printf("Received clipboard data from %s: %d bytes", c.identification, len(message))
+		server.broadcast <- &Message{
+			identification: c.identification,
+			data:           message,
+			sender:         c,
+		}
+	}
+}
+
+func (c *Client) writePump() {
+	defer c.conn.Close()
+
+	for message := range c.send {
+		sendMessage(c.conn, websocket.TextMessage, message)
+		log.Printf("Sent clipboard data to %s", c.identification)
+	}
+}
+
+func sendMessage(conn *websocket.Conn, messageType int, message []byte) {
+	err := conn.WriteMessage(messageType, message)
+	if err != nil {
+		log.Println("Error sending message:", err)
+	}
+}
+
+func handleWebSocket(server *Server, w http.ResponseWriter, r *http.Request) {
+	conn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Println("Error upgrading connection:", err)
+		return
+	}
+
+	// First message should be identification
+	_, identification, err := conn.ReadMessage()
+	if err != nil {
+		log.Println("Error reading identification:", err)
+		conn.Close()
+		return
+	}
+
+	client := &Client{
+		conn:           conn,
+		identification: string(identification),
+		send:           make(chan []byte, 256),
+	}
+
+	server.register <- client
+
+	go client.writePump()
+	go client.readPump(server)
+}
+
+func main() {
+	port := EmbeddedServerPort
+	if port == "" {
+		port = "8080"
+	}
+
+	server := newServer()
+	go server.run()
+
+	http.HandleFunc("/ws", func(w http.ResponseWriter, r *http.Request) {
+		handleWebSocket(server, w, r)
+	})
+
+	log.Printf("Server starting on port %s", port)
+	err := http.ListenAndServe(":"+port, nil)
+	if err != nil {
+		log.Fatal("ListenAndServe error:", err)
+	}
+}