add feature check if ip is active

handlers/infos.go

@@ -5,30 +5,32 @@ import (
 	"net"
 	"net/http"
 	"slideshowApp/env"
-	"strings"
 )
 
 // Helper to get the local network IP address
-func getLocalIP() string {
+func GetLocalIP() string {
 	if env.Host.GetValue() != "0.0.0.0" && env.Host.GetValue() != "localhost" {
 		return env.Host.GetValue()
 	}
 
-	addrs, err := net.InterfaceAddrs()
+	if ip := getActiveIP(); ip != "" {
+		return ip
+	}
+	return "localhost"
+}
+
+func getActiveIP() string {
+	conn, err := net.Dial("udp", "8.8.8.8:80")
 	if err != nil {
-		return "localhost"
+		return ""
 	}
-	for _, address := range addrs {
+	defer conn.Close()
-		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+
-			if ipnet.IP.To4() != nil {
+	addr := conn.LocalAddr()
-				if env.Env.GetValue() == "development" && !strings.Contains(ipnet.IP.String(), "192.168") {
+	if udpAddr, ok := addr.(*net.UDPAddr); ok {
-					continue
+		return udpAddr.IP.String()
 	}
-				return ipnet.IP.String()
+	return ""
-			}
-		}
-	}
-	return "localhost"
 }
 
 func InfoHandler(w http.ResponseWriter, r *http.Request) {
@@ -43,7 +45,7 @@ func InfoHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	data := map[string]string{
-		"ip":    getLocalIP(),
+		"ip":    GetLocalIP(),
 		"port":  port,
 		"speed": speed,
 	}