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// 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 (
"compress/flate"
"compress/gzip"
"net/http"
"strings"
"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, data []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)
return
}
switch mimeType {
case "text/javascript; charset=utf-8", "text/css; charset=utf-8":
Compress(w, r, data)
default:
w.Write(data)
}
}
// Compress the response sent to the browser.
func Compress(w http.ResponseWriter, r *http.Request, data []byte) {
acceptEncoding := r.Header.Get("Accept-Encoding")
switch {
case strings.Contains(acceptEncoding, "gzip"):
w.Header().Set("Content-Encoding", "gzip")
gzipWriter := gzip.NewWriter(w)
defer gzipWriter.Close()
gzipWriter.Write(data)
case strings.Contains(acceptEncoding, "deflate"):
w.Header().Set("Content-Encoding", "deflate")
flateWriter, _ := flate.NewWriter(w, -1)
defer flateWriter.Close()
flateWriter.Write(data)
default:
w.Write(data)
}
}
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