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/*
* Copyright 2012-2022 Li Kexian
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* A toolkit for Golang development
* https://www.likexian.com/
*/
package xhttp
import (
"compress/gzip"
"io"
"io/ioutil"
"net/http"
"strings"
"sync"
)
// gzPool is gzip writer pool
var gzPool = sync.Pool{
New: func() interface{} {
return gzip.NewWriter(ioutil.Discard)
},
}
// gzResponseWriter is gzip ResponseWriter
type gzResponseWriter struct {
io.Writer
http.ResponseWriter
}
// Write write body byte
func (w *gzResponseWriter) Write(b []byte) (int, error) {
return w.Writer.Write(b)
}
// WriteString write body string
func (w *gzResponseWriter) WriteString(s string) (int, error) {
return w.Writer.Write([]byte(s))
}
// WriteHeader write http status code header
func (w *gzResponseWriter) WriteHeader(status int) {
w.Header().Del("Content-Length")
w.ResponseWriter.WriteHeader(status)
}
// GzWrap is http gzip transparent compression middleware
func GzWrap(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Vary", "Accept-Encoding")
if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
next.ServeHTTP(w, r)
return
}
gz := gzPool.Get().(*gzip.Writer)
defer func() {
gz.Reset(ioutil.Discard)
gzPool.Put(gz)
}()
gz.Reset(w)
defer gz.Close()
w.Header().Set("Content-Encoding", "gzip")
next.ServeHTTP(&gzResponseWriter{Writer: gz, ResponseWriter: w}, r)
})
}
// SetHeaderWrap is http set header middleware
func SetHeaderWrap(next http.Handler, header Header) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
for k, v := range header {
w.Header().Set(k, v)
}
next.ServeHTTP(w, r)
})
}
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