// Copyright 2018 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

package response

import (
	"net/http"
	"time"
)

// Redirect redirects the user to another location.
func Redirect(w http.ResponseWriter, r *http.Request, path string) {
	http.Redirect(w, r, path, http.StatusFound)
}

// NotModified sends a response with a 304 status code.
func NotModified(w http.ResponseWriter) {
	w.WriteHeader(http.StatusNotModified)
}

// Cache returns a response with caching headers.
func Cache(w http.ResponseWriter, r *http.Request, mimeType, etag string, content []byte, duration time.Duration) {
	w.Header().Set("Content-Type", mimeType)
	w.Header().Set("ETag", etag)
	w.Header().Set("Cache-Control", "public")
	w.Header().Set("Expires", time.Now().Add(duration).Format(time.RFC1123))

	if etag == r.Header.Get("If-None-Match") {
		w.WriteHeader(http.StatusNotModified)
	} else {
		w.Write(content)
	}
}