From 64744e218a50d8b3819115c5e66dbbab533cbe93 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrian=20Z=C3=BCrcher?= <zuercher@mst.local>
Date: Sat, 17 Jan 2026 22:41:42 +0100
Subject: [PATCH] add feature check if ip is active

---
 handlers/infos.go | 34 ++++++++++++++++++----------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/handlers/infos.go b/handlers/infos.go
index abfaf96..0f6bcd8 100644
--- a/handlers/infos.go
+++ b/handlers/infos.go
@@ -5,32 +5,34 @@ 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 err != nil {
-		return "localhost"
-	}
-	for _, address := range addrs {
-		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
-			if ipnet.IP.To4() != nil {
-				if env.Env.GetValue() == "development" && !strings.Contains(ipnet.IP.String(), "192.168") {
-					continue
-				}
-				return ipnet.IP.String()
-			}
-		}
+	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 ""
+	}
+	defer conn.Close()
+
+	addr := conn.LocalAddr()
+	if udpAddr, ok := addr.(*net.UDPAddr); ok {
+		return udpAddr.IP.String()
+	}
+	return ""
+}
+
 func InfoHandler(w http.ResponseWriter, r *http.Request) {
 	port := env.Port.GetValue()
 	if port == "" {
@@ -43,7 +45,7 @@ func InfoHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	data := map[string]string{
-		"ip":    getLocalIP(),
+		"ip":    GetLocalIP(),
 		"port":  port,
 		"speed": speed,
 	}