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package middleware
import (
"compress/gzip"
"net/http"
"strings"
)
type gzipResponseWriter struct {
gzip.Writer
http.ResponseWriter
}
func newGzipResponseWriter(w http.ResponseWriter) *gzipResponseWriter {
gzrw := new(gzipResponseWriter)
gzrw.Writer = *gzip.NewWriter(w)
gzrw.ResponseWriter = w
return gzrw
}
func (gzrw *gzipResponseWriter) Close() error {
return gzrw.Writer.Close()
}
func (gzrw *gzipResponseWriter) Header() http.Header {
return gzrw.ResponseWriter.Header()
}
func (gzrw *gzipResponseWriter) Write(p []byte) (int, error) {
n, err := gzrw.Writer.Write(p)
return n, err
}
func (gzrw *gzipResponseWriter) WriteHeader(statuscode int) {
gzrw.ResponseWriter.WriteHeader(statuscode)
}
// Middleware to conditionally gzip a response
func Gzip(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
acceptedEncodings := r.Header.Get("Accept-Encoding")
if !strings.Contains(acceptedEncodings, "gzip") {
Logger.DebugContext(r.Context(), "Using gzip middleware but client does not support gzip encoding")
next.ServeHTTP(w, r)
return
}
w.Header().Add("Content-Encoding", "gzip")
gzrw := newGzipResponseWriter(w)
defer gzrw.Close()
next.ServeHTTP(gzrw, r)
})
}
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