feat: brotli precompressed assets (resolve #284)

utils/fs/neutered.go

@@ -0,0 +1,34 @@
+package fs
+
+import (
+	"io/fs"
+	"path/filepath"
+)
+
+// https://www.alexedwards.net/blog/disable-http-fileserver-directory-listings
+
+type NeuteredFileSystem struct {
+	Fs fs.FS
+}
+
+func (nfs NeuteredFileSystem) Open(path string) (fs.File, error) {
+	f, err := nfs.Fs.Open(path)
+	if err != nil {
+		return nil, err
+	}
+
+	s, err := f.Stat()
+	if s.IsDir() {
+		index := filepath.Join(path, "index.html")
+		if _, err := nfs.Fs.Open(index); err != nil {
+			closeErr := f.Close()
+			if closeErr != nil {
+				return nil, closeErr
+			}
+
+			return nil, err
+		}
+	}
+
+	return f, nil
+}