removes LocalAddress if its not defined from response

README.md

@@ -4,7 +4,7 @@ a little container to fix [this bug](https://github.com/jellyfin/jellyfin/issues
 
 ## Usage
 
-it can take a config file as first argument.
+it can take a config file as first argument. if `external_url` is not defined, the JSON response wont include it at all!
 
 ## config example
 

main.go

@@ -24,7 +24,7 @@ type Logic struct {
 
 // PublicInfo Chromecast configuration Payload.
 type PublicInfo struct {
-	LocalAddress           string `json:"LocalAddress"`
+	LocalAddress           string `json:"LocalAddress,omitempty"`
 	ServerName             string `json:"ServerName"`
 	Version                string `json:"Version"`
 	ProductName            string `json:"ProductName"`
@@ -33,6 +33,7 @@ type PublicInfo struct {
 	StartupWizardCompleted bool   `json:"StartupWizardCompleted"`
 }
 
+// nolint:funlen
 func (l Logic) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	logger := logginghandler.Logger(r)
 
@@ -74,9 +75,21 @@ func (l Logic) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	jd.LocalAddress = l.ExternalURL
+	// jd.LocalAddress = l.ExternalURL
+	var nd PublicInfo
+	nd.ServerName = jd.ServerName
+	nd.Version = jd.Version
+	nd.ProductName = jd.ProductName
+	nd.OperatingSystem = jd.OperatingSystem
+	nd.ID = jd.ID
+	nd.StartupWizardCompleted = jd.StartupWizardCompleted
 
-	nd, err := json.Marshal(jd)
+	// When there is no external url defined, it wont include it in the response.
+	if l.ExternalURL != "" {
+		nd.LocalAddress = l.ExternalURL
+	}
+
+	bd, err := json.Marshal(nd)
 	if err != nil {
 		logger.Error().Msg(err.Error())
 		http.Error(w, "could not marshal body", http.StatusInternalServerError)
@@ -84,7 +97,7 @@ func (l Logic) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if _, err := w.Write(nd); err != nil {
+	if _, err := w.Write(bd); err != nil {
 		logger.Error().Msg(err.Error())
 	}
 }
@@ -113,10 +126,6 @@ func main() {
 		log.Fatal().Msg("needs key 'internal_url'")
 	}
 
-	if viper.GetString("external_url") == "" {
-		log.Fatal().Msg("needs key 'external_url'")
-	}
-
 	l := Logic{
 		InternalURL: viper.GetString("internal_url"),
 		ExternalURL: viper.GetString("external_url"),