Add port env option

main.go

@@ -20,6 +20,7 @@ type Options struct {
 	RedirectURI string
 	Scopes      []string
 	DBPath      string
+	Port        string
 }
 
 var options Options
@@ -82,9 +83,9 @@ func main() {
 		ctx.WriteString("Authenticated! Access token: " + token)
 	})
 
-	logger.Info("Starting web server on :3000")
+	logger.Info("Starting web server on 0.0.0.0:%s", options.Port)
 	go func() {
-		if err := fasthttp.ListenAndServe(":3000", r.Handler); err != nil {
+		if err := fasthttp.ListenAndServe("0.0.0.0:"+options.Port, r.Handler); err != nil {
 			logger.Error("Server failed: %v", err)
 		}
 	}()
@@ -120,11 +121,16 @@ func LoadOptions() (Options, error) {
 	if dbPath == "" {
 		return Options{}, fmt.Errorf("DB_PATH is required in .env file")
 	}
+	port := os.Getenv("HTTP_SERVER_PORT")
+	if port == "" {
+		return Options{}, fmt.Errorf("HTTP_SERVER_PORT is required in .env file")
+	}
 
 	return Options{
 		ClientID:    clientID,
 		RedirectURI: redirectURI,
 		Scopes:      scopes,
 		DBPath:      dbPath,
+		Port:        port,
 	}, nil
 }