Implemented new C++ logic

Client/webui/main.go

@@ -0,0 +1,41 @@
+// Command webui is a tiny static file server for the StreamHub browser SPA.
+//
+// It serves the existing Client/udpstreamer/static directory; the SPA talks
+// WebSocket directly to the C++ StreamHub (pass ?hub=host:8090 in the URL).
+//
+// Usage:
+//
+//	webui -addr :8080 -static ../udpstreamer/static
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+)
+
+var buildVersion = "streamhub-webui-dev"
+
+func main() {
+	addr := flag.String("addr", ":8080", "HTTP listen address")
+	static := flag.String("static", "../udpstreamer/static", "directory with the SPA files")
+	hub := flag.String("hub", "localhost:8090", "StreamHub WebSocket host:port the SPA should connect to")
+	flag.Parse()
+
+	http.Handle("/", http.FileServer(http.Dir(*static)))
+	http.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprint(w, buildVersion)
+	})
+	// The SPA fetches /hub at startup to discover the StreamHub address, so
+	// plain http://localhost:8080/ works without a ?hub= query parameter.
+	http.HandleFunc("/hub", func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprint(w, *hub)
+	})
+
+	log.Printf("StreamHub WebUI listening on %s (static=%s, hub=%s)", *addr, *static, *hub)
+	log.Printf("open http://localhost%s/", *addr)
+	if err := http.ListenAndServe(*addr, nil); err != nil {
+		log.Fatalf("http: %v", err)
+	}
+}