/
gzip.go
62 lines (53 loc) · 1.26 KB
/
gzip.go
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package filters
import (
"compress/flate"
"compress/gzip"
"net/http"
"strings"
"github.com/JessonChan/cango"
"github.com/JessonChan/canlog"
)
// todo register with url
type GzipFilter struct {
cango.Filter `value:"/*"`
}
type gzipWriter struct {
http.ResponseWriter
gzWriter *gzip.Writer
written bool
}
func newGzipWriter(w http.ResponseWriter) *gzipWriter {
return &gzipWriter{ResponseWriter: w, gzWriter: func() *gzip.Writer {
w, _ := gzip.NewWriterLevel(w, flate.BestCompression)
return w
}()}
}
func (gw *gzipWriter) Write(bs []byte) (int, error) {
if !gw.written {
gw.Header().Del("Content-Length")
gw.Header().Set("Content-Encoding", "gzip")
}
gw.written = true
return gw.gzWriter.Write(bs)
}
func (gw *gzipWriter) Close() error {
if gw.written {
return gw.gzWriter.Close()
}
return nil
}
func (l *GzipFilter) PreHandle(req *cango.WebRequest) interface{} {
if strings.Contains(req.Request.Header.Get("Accept-Encoding"), "gzip") {
req.ResponseWriter = newGzipWriter(req.ResponseWriter)
}
return true
}
func (l *GzipFilter) PostHandle(req *cango.WebRequest) interface{} {
if rw, ok := req.ResponseWriter.(*gzipWriter); ok {
err := rw.Close()
if err != nil {
canlog.CanError(req.URL.Path+req.URL.RawQuery, err)
}
}
return true
}