You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.1 KiB
90 lines
2.1 KiB
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Copyright 2012 The Gorilla Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package rpc
|
|
|
|
import (
|
|
"compress/flate"
|
|
"compress/gzip"
|
|
"io"
|
|
"net/http"
|
|
"strings"
|
|
"unicode"
|
|
)
|
|
|
|
// gzipWriter writes and closes the gzip writer.
|
|
type gzipWriter struct {
|
|
w *gzip.Writer
|
|
}
|
|
|
|
func (gw *gzipWriter) Write(p []byte) (n int, err error) {
|
|
defer gw.w.Close()
|
|
return gw.w.Write(p)
|
|
}
|
|
|
|
// gzipEncoder implements the gzip compressed http encoder.
|
|
type gzipEncoder struct {
|
|
}
|
|
|
|
func (enc *gzipEncoder) Encode(w http.ResponseWriter) io.Writer {
|
|
w.Header().Set("Content-Encoding", "gzip")
|
|
return &gzipWriter{gzip.NewWriter(w)}
|
|
}
|
|
|
|
// flateWriter writes and closes the flate writer.
|
|
type flateWriter struct {
|
|
w *flate.Writer
|
|
}
|
|
|
|
func (fw *flateWriter) Write(p []byte) (n int, err error) {
|
|
defer fw.w.Close()
|
|
return fw.w.Write(p)
|
|
}
|
|
|
|
// flateEncoder implements the flate compressed http encoder.
|
|
type flateEncoder struct {
|
|
}
|
|
|
|
func (enc *flateEncoder) Encode(w http.ResponseWriter) io.Writer {
|
|
fw, err := flate.NewWriter(w, flate.DefaultCompression)
|
|
if err != nil {
|
|
return w
|
|
}
|
|
w.Header().Set("Content-Encoding", "deflate")
|
|
return &flateWriter{fw}
|
|
}
|
|
|
|
// CompressionSelector generates the compressed http encoder.
|
|
type CompressionSelector struct {
|
|
}
|
|
|
|
// acceptedEnc returns the first compression type in "Accept-Encoding" header
|
|
// field of the request.
|
|
func acceptedEnc(req *http.Request) string {
|
|
encHeader := req.Header.Get("Accept-Encoding")
|
|
if encHeader == "" {
|
|
return ""
|
|
}
|
|
encTypes := strings.FieldsFunc(encHeader, func(r rune) bool {
|
|
return unicode.IsSpace(r) || r == ','
|
|
})
|
|
for _, enc := range encTypes {
|
|
if enc == "gzip" || enc == "deflate" {
|
|
return enc
|
|
}
|
|
}
|
|
return ""
|
|
}
|
|
|
|
// Select method selects the correct compression encoder based on http HEADER.
|
|
func (_ *CompressionSelector) Select(r *http.Request) Encoder {
|
|
switch acceptedEnc(r) {
|
|
case "gzip":
|
|
return &gzipEncoder{}
|
|
case "flate":
|
|
return &flateEncoder{}
|
|
}
|
|
return DefaultEncoder
|
|
}
|
|
|