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218 lines
5.1 KiB
218 lines
5.1 KiB
package localchat
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import (
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"encoding/json"
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"fmt"
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"log"
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"net"
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"net/http"
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"os"
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"time"
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)
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const (
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BroadcastIP = "255.255.255.255"
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BroadcastPort = 20249
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)
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type UdpMessage struct {
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Type string `json:"type"`
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IP string `json:"ip"`
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Hostname string `json:"hostname"`
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Message interface{} `json:"message"`
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}
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var broadcastAddr = fmt.Sprintf("%s:%d", BroadcastIP, BroadcastPort)
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var OnlineUsers = make(map[string]UdpMessage)
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// SendBroadcast 发送广播消息
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func init() {
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go InitBroadcast()
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go ListenForBroadcast()
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}
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func InitBroadcast() {
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ticker := time.NewTicker(5 * time.Second) // 每 5 秒发送一次广播消息
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defer ticker.Stop()
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for range ticker.C {
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hostname, err := os.Hostname()
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if err != nil {
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log.Printf("Failed to get hostname: %v", err)
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continue
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}
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message := UdpMessage{
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Type: "online",
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Hostname: hostname,
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Message: "",
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}
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err = SendBroadcast(message)
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if err != nil {
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log.Println("Failed to send broadcast message:", err)
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}
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}
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}
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func SendBroadcast(message UdpMessage) error {
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addr, err := net.ResolveUDPAddr("udp4", broadcastAddr)
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if err != nil {
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log.Printf("Failed to resolve UDP address %s: %v", broadcastAddr, err)
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return err
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}
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// 使用本地地址进行连接
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localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:0")
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if err != nil {
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log.Printf("Failed to resolve local UDP address: %v", err)
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return err
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}
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conn, err := net.ListenUDP("udp4", localAddr)
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if err != nil {
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log.Printf("Failed to listen on UDP address %s: %v", broadcastAddr, err)
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return err
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}
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defer conn.Close()
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// 获取本地 IP 地址
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localIP, err := getLocalIP(conn)
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if err != nil {
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log.Printf("Failed to get local IP address: %v", err)
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return err
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}
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message.IP = localIP
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data, err := json.Marshal(message)
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if err != nil {
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log.Printf("Failed to marshal JSON for %s: %v", broadcastAddr, err)
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return err
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}
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_, err = conn.WriteToUDP(data, addr)
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if err != nil {
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log.Printf("Failed to write to UDP address %s: %v", broadcastAddr, err)
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return err
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}
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log.Printf("发送广播消息到 %s 成功", broadcastAddr)
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return nil
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}
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// ListenForBroadcast 监听广播消息
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func ListenForBroadcast() {
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// 使用本地地址监听
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localAddr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf(":%d", BroadcastPort))
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if err != nil {
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log.Fatalf("Failed to resolve local UDP address: %v", err)
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}
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conn, err := net.ListenUDP("udp4", localAddr)
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if err != nil {
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log.Fatalf("Failed to listen on UDP address: %v", err)
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}
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defer conn.Close()
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// 获取本地 IP 地址
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localIP, err := getLocalIP(conn)
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if err != nil {
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log.Printf("Failed to get local IP address: %v", err)
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}
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// 开始监听广播消息
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buffer := make([]byte, 1024)
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for {
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n, remoteAddr, err := conn.ReadFromUDP(buffer)
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if err != nil {
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log.Printf("Error reading from UDP: %v", err)
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continue
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}
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var udpMsg UdpMessage
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err = json.Unmarshal(buffer[:n], &udpMsg)
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if err != nil {
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log.Printf("Error unmarshalling JSON: %v", err)
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continue
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}
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if udpMsg.IP == localIP {
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continue
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}
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OnlineUsers[udpMsg.IP] = udpMsg
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if udpMsg.Type == "file" {
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RecieveFile(udpMsg)
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}
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log.Printf("Received message from %s: %s", remoteAddr, udpMsg.Hostname)
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}
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}
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// SendToIP 向指定的 IP 地址发送 UDP 消息
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func SendToIP(message UdpMessage) error {
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toIp := message.IP
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addr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:%d", toIp, BroadcastPort))
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if err != nil {
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log.Printf("Failed to resolve UDP address %s:%d: %v", toIp, BroadcastPort, err)
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return err
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}
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// 使用本地地址进行连接
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localAddr, err := net.ResolveUDPAddr("udp4", "0.0.0.0:0")
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if err != nil {
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log.Printf("Failed to resolve local UDP address: %v", err)
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return err
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}
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conn, err := net.ListenUDP("udp4", localAddr)
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if err != nil {
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log.Printf("Failed to listen on UDP address %s: %v", toIp, err)
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return err
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}
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defer conn.Close()
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// 获取本地 IP 地址
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localIP, err := getLocalIP(conn)
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if err != nil {
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log.Printf("Failed to get local IP address: %v", err)
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}
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message.IP = localIP
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data, err := json.Marshal(message)
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if err != nil {
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log.Printf("Failed to marshal JSON for %s: %v", toIp, err)
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return err
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}
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_, err = conn.WriteToUDP(data, addr)
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if err != nil {
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log.Printf("Failed to write to UDP address %s: %v", toIp, err)
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return err
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}
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log.Printf("发送 UDP 消息到 %s 成功", toIp)
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return nil
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}
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// 获取 OnlineUsers 的最新状态
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func GetOnlineUsers() map[string]UdpMessage {
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return OnlineUsers
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}
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// getLocalIP 获取本地 IP 地址
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func getLocalIP(conn *net.UDPConn) (string, error) {
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localAddr := conn.LocalAddr().(*net.UDPAddr)
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return localAddr.IP.String(), nil
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}
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// HandleMessage 处理 HTTP 请求
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func HandleMessage(w http.ResponseWriter, r *http.Request) {
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var msg UdpMessage
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decoder := json.NewDecoder(r.Body)
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if err := decoder.Decode(&msg); err != nil {
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http.Error(w, "Invalid request body", http.StatusBadRequest)
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return
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}
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defer r.Body.Close()
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err := SendToIP(msg)
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if err != nil {
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http.Error(w, "Failed to send message", http.StatusInternalServerError)
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return
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}
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w.WriteHeader(http.StatusOK)
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fmt.Fprintln(w, "Text message send successfully")
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}
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