51 lines
1.1 KiB
Go
51 lines
1.1 KiB
Go
package transcoder
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import (
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"compress/gzip"
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"github.com/barnacs/compy/proxy"
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"net/http"
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"strings"
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)
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type Gzip struct {
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proxy.Transcoder
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SkipGzipped bool
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}
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func (t *Gzip) Transcode(w *proxy.ResponseWriter, r *proxy.ResponseReader, headers http.Header) error {
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if t.decompress(r) {
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gzr, err := gzip.NewReader(r.Reader)
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if err != nil {
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return err
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}
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defer gzr.Close()
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r.Reader = gzr
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r.Header().Del("Content-Encoding")
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w.Header().Del("Content-Encoding")
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}
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shouldGzip := false
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for _, v := range strings.Split(headers.Get("Accept-Encoding"), ", ") {
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if strings.SplitN(v, ";", 2)[0] == "gzip" {
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shouldGzip = true
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break
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}
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}
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if shouldGzip && compress(r) {
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gzw := gzip.NewWriter(w.Writer)
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defer gzw.Flush()
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w.Writer = gzw
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w.Header().Set("Content-Encoding", "gzip")
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}
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return t.Transcoder.Transcode(w, r, headers)
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}
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func (t *Gzip) decompress(r *proxy.ResponseReader) bool {
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return !t.SkipGzipped && r.Header().Get("Content-Encoding") == "gzip"
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}
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func compress(r *proxy.ResponseReader) bool {
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return r.Header().Get("Content-Encoding") == ""
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}
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