static.go

package httputil

import (
	"bytes"
	"io/ioutil"
	"net/http"
	"os"
	"time"
)

// StaticContent is an http.Handler that serves in-memory data as if
// it were a static file.
type StaticContent struct {
	modtime time.Time
	name    string
	data    []byte
}

// LoadStaticContent creates a StaticContent by loading data from a file.
func LoadStaticContent(path string) (*StaticContent, error) {
	stat, err := os.Stat(path)
	if err != nil {
		return nil, err
	}
	data, err := ioutil.ReadFile(path) // #nosec
	if err != nil {
		return nil, err
	}
	return &StaticContent{
		name:    path,
		modtime: stat.ModTime(),
		data:    data,
	}, nil
}

func (c *StaticContent) ServeHTTP(w http.ResponseWriter, req *http.Request) {
	http.ServeContent(w, req, c.name, c.modtime, bytes.NewReader(c.data))
}