/
gzipper.go
81 lines (69 loc) · 2.06 KB
/
gzipper.go
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// Copyright 2016,2017,2018 Yaacov Zamir <kobi.zamir@gmail.com>
// and other contributors.
//
// 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.
// Package middleware middlewares for Mohawk
package middleware
import (
"io"
"net/http"
"strings"
"compress/gzip"
)
type gzBody struct {
*gzip.Reader
io.ReadCloser
}
func (r gzBody) Read(p []byte) (n int, err error) {
return r.Reader.Read(p)
}
func (r gzBody) Close() error {
return r.ReadCloser.Close()
}
type gzRespWriter struct {
io.Writer
http.ResponseWriter
}
func (w gzRespWriter) Write(b []byte) (int, error) {
return w.Writer.Write(b)
}
// GzipDecodeDecorator addes a gzip decoder to reader
func GzipDecodeDecorator() Decorator {
return Decorator(func(h http.HandlerFunc) http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if r.Header.Get("Content-Encoding") == "gzip" {
// TODO: I personally think it's a good idea to return
// http.StatusBadRequest if err != nil
gzReader, err := gzip.NewReader(r.Body)
if err == nil {
r.Body = gzBody{gzReader, r.Body}
}
}
h(w, r)
})
})
}
// GzipEncodeDecorator addes a gzip encoder to Writer
func GzipEncodeDecorator() Decorator {
return Decorator(func(h http.HandlerFunc) http.HandlerFunc {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
w.Header().Set("Content-Encoding", "gzip")
gz := gzip.NewWriter(w)
defer gz.Close()
w = gzRespWriter{Writer: gz, ResponseWriter: w}
}
h(w, r)
})
})
}