http.FileServer with no directory listing.

nolist.go

// http://grokbase.com/p/gg/golang-nuts/12a9xcadca/go-nuts-disable-directory-listing-with-http-fileserver

package main

import (
	"net/http"
	"os"
)

type NoListFile struct {
	http.File
}

func (f NoListFile) Readdir(count int) ([]os.FileInfo, error) {
	return nil, nil
}

type NoListFileSystem struct {
	base http.FileSystem
}

func (fs NoListFileSystem) Open(name string) (http.File, error) {
	f, err := fs.base.Open(name)
	if err != nil {
		return nil, err
	}
	return NoListFile{f}, nil
}

func main() {
	fs := NoListFileSystem{http.Dir(".")}
	http.ListenAndServe(":8080", http.FileServer(fs))
}

Thanks for this.

Wanted to show a 404 for directories as well, so I added in the Open method:

func (fs NoListFileSystem) Open(name string) (http.File, error) {
	f, err := fs.base.Open(name)
	if err != nil {
		return nil, err
	}

	info, err := f.Stat()
	if err != nil {
		return nil, err
	}
	if info.IsDir() {
		return nil, os.ErrNotExist
	}

	return NoListFile{f}, nil
}

edit: messed up earlier, have to use the Stat method of the opened file (as opposed to os.Stat(name)) since base has its own root directory. Fixed that.