Added CallbackApp to better access backend.Backend from with in an App

Fixed issues with CORS not being able to do an OPTIONS request
Fixed folders not being processed properly.
Fixed some other issues.

main.go

@@ -52,7 +52,7 @@ func main() {
 		Addr:    *addr,
 		Handler: mux,
 	}
-	err := serv.ListenAndServeTLS(filepath.Join(flag.Arg(0), "cert.pem"), filepath.Join(flag.Arg(0), "key.pem"))
+	err := serv.ListenAndServeTLS(filepath.Join(flag.Arg(0), "fullchain.pem"), filepath.Join(flag.Arg(0), "key.pem"))
 	log.Println("webserver closed:", err)
 }
 
@@ -70,15 +70,13 @@ func setupMongo(uri string) {
 }
 
 func setupBackend(mux *http.ServeMux) {
-	blogApp = blog.NewBlogApp(back, mongoClient.Database("blog"))
-	swApp := swassistant.NewSWBackend(back, mongoClient.Database("swassistant"))
-	cdrApp := cdr.NewBackend(back, mongoClient.Database("cdr"))
+	blogApp = blog.NewBlogApp(mongoClient.Database("blog"))
 	var err error
 	back, err = backend.NewBackend(db.NewMongoTable[backend.ApiKey](
 		mongoClient.Database("darkstorm").Collection("keys")),
 		blogApp,
-		swApp,
-		cdrApp,
+		swassistant.NewSWBackend(mongoClient.Database("swassistant")),
+		cdr.NewBackend(mongoClient.Database("cdr")),
 	)
 	back.AddCorsAddress("https://darkstorm.tech")
 	if err != nil {
@@ -105,12 +103,11 @@ func mainHandle(w http.ResponseWriter, r *http.Request) {
 	if err == nil && !stat.IsDir() {
 		http.ServeFile(w, r, filepath.Join(*webRoot, path))
 		return
-	}
-	spl := strings.Split(path, "/")
-	if len(spl) > 1 {
-		stat, err = os.Stat(filepath.Join(*webRoot, spl[0]))
-		if err == nil && stat.IsDir() {
-			http.ServeFile(w, r, filepath.Join(*webRoot, spl[0], "index.html"))
+	} else if stat.IsDir() {
+		ind := filepath.Join(*webRoot, path, "index.html")
+		stat, err = os.Stat(ind)
+		if err == nil {
+			http.ServeFile(w, r, ind)
 			return
 		}
 	}