fixes and improvements in broker and render

router.go

@@ -2,7 +2,10 @@ package goblocks
 
 import (
 	"net/http"
+	"os"
+	"path/filepath"
 	"slices"
+	"strings"
 )
 
 type Middleware func(http.Handler) http.Handler
@@ -35,6 +38,31 @@ func (r *Router) Group(fn func(r *Router)) {
 	fn(sub)
 }
 
+func (r *Router) Static(urlPrefix, dir string) {
+	urlPrefix = strings.TrimSuffix(urlPrefix, "/")
+
+	fileServer := http.FileServer(http.Dir(dir))
+	fs := http.StripPrefix(urlPrefix, http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		fullPath := filepath.Join(dir, req.URL.Path)
+
+		info, err := os.Stat(fullPath)
+		if err != nil {
+			http.NotFound(w, req)
+			return
+		}
+		if info.IsDir() {
+			http.NotFound(w, req)
+			return
+		}
+
+		w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
+
+		fileServer.ServeHTTP(w, req)
+	}))
+
+	r.Handle(urlPrefix+"/", fs)
+}
+
 func (r *Router) HandleFunc(pattern string, h http.HandlerFunc) {
 	r.Handle(pattern, h)
 }