From 3707690aa02277812e65acdb10c55524e1d8080d Mon Sep 17 00:00:00 2001
From: soedar <soedar.sg@gmail.com>
Date: Thu, 21 Dec 2017 10:13:25 +0800
Subject: [PATCH] Add file server which disables directory listing (#7)

---
 web/fileserver.go | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 web/fileserver.go

diff --git a/web/fileserver.go b/web/fileserver.go
new file mode 100644
index 0000000..c8a3bca
--- /dev/null
+++ b/web/fileserver.go
@@ -0,0 +1,32 @@
+package web
+
+import (
+	"net/http"
+	"os"
+)
+
+// FileServer returns a handler that serves HTTP requests with the contents of the file system rooted at root.
+// This implementation will always returns 404 Not Found if the request is a directory, and will not serve `index.html`.
+// https://groups.google.com/d/msg/golang-nuts/bStLPdIVM6w/wSKqNoaSji8J
+func FileServer(root http.Dir) http.Handler {
+	return http.FileServer(justFilesFilesystem{root})
+}
+
+type justFilesFilesystem struct {
+	fs http.FileSystem
+}
+
+func (fs justFilesFilesystem) Open(name string) (http.File, error) {
+	f, err := fs.fs.Open(name)
+
+	if err != nil {
+		return nil, err
+	}
+
+	stat, err := f.Stat()
+	if stat.IsDir() {
+		return nil, os.ErrNotExist
+	}
+
+	return f, nil
+}