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189 lines
4.3 KiB
189 lines
4.3 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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)
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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 multicastAddrs = []string{
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"239.255.255.250:2024",
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"239.255.255.251:2024",
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"224.0.0.251:2024",
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}
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var OnlineUsers = make(map[string]UdpMessage)
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// SendMulticast 发送多播消息
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func init() {
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go InitMulticast()
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go ListenForMulticast()
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}
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func InitMulticast() {
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myIP, myHostname, err := GetMyIPAndHostname()
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if err != nil {
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log.Println("Failed to get IP and hostname:", err)
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return
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}
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message := UdpMessage{
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Type: "online",
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IP: myIP,
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Hostname: myHostname,
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Message: "online",
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}
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SendMulticast(message)
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}
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func SendMulticast(message UdpMessage) error {
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for _, addrStr := range multicastAddrs {
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addr, err := net.ResolveUDPAddr("udp4", addrStr)
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if err != nil {
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log.Printf("Failed to resolve UDP address %s: %v", addrStr, err)
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continue
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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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continue
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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", addrStr, err)
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continue
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}
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defer conn.Close()
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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", addrStr, err)
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continue
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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", addrStr, err)
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continue
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}
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log.Printf("发送多播消息到 %s 成功", addrStr)
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}
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return nil
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}
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// ListenForMulticast 监听所有多播消息
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func ListenForMulticast() {
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// 使用本地地址监听
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localAddr, err := net.ResolveUDPAddr("udp4", ":56780")
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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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// 开始监听多播消息
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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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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(ip string, message UdpMessage) error {
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addr, err := net.ResolveUDPAddr("udp4", ip)
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if err != nil {
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log.Printf("Failed to resolve UDP address %s: %v", ip, 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", ip, err)
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return err
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}
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defer conn.Close()
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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", ip, 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", ip, 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", ip)
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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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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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ip := msg.IP
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preferredIP, err := GetMyIp()
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if err != nil {
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http.Error(w, "Failed to get preferred IP", http.StatusInternalServerError)
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return
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}
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msg.IP = preferredIP
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err = SendToIP(ip, 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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