singleFileHandler.go

// singleFileHandler creates a http handler for a single statically specific
// file
// note that this doesn't use the url request path as the file, it uses the
// function argument as what file to serve
func singleFileHandler(f string) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// Return a 404 if the file doesn't exist
		info, err := os.Stat(f)
		if err != nil {
			if os.IsNotExist(err) {
				http.NotFound(w, r)
				return
			}
		}

		// Return a 404 if the request is for a directory
		if info.IsDir() {
			http.NotFound(w, r)
			return
		}

		// otherwise serve the single file
		http.ServeFile(w, r, f)
	})
}