[#146] Add kludge.bypass_content_encoding_check_in_chunks flag

Flag allows to skip checking `Content-Encoding` for `aws-chunked` value

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/handler/put.go

@@ -225,6 +225,9 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 		h.logAndSendError(w, "failed to get body reader", reqInfo, err)
 		return
 	}
+	if encodings := r.Header.Get(api.ContentEncoding); len(encodings) > 0 {
+		metadata[api.ContentEncoding] = encodings
+	}
 
 	var size uint64
 	if r.ContentLength > 0 {
@@ -329,6 +332,26 @@ func (h *handler) getBodyReader(r *http.Request) (io.ReadCloser, error) {
 		return r.Body, nil
 	}
 
+	encodings := r.Header.Values(api.ContentEncoding)
+	var chunkedEncoding bool
+	resultContentEncoding := make([]string, 0, len(encodings))
+	for _, enc := range encodings {
+		for _, e := range strings.Split(enc, ",") {
+			e = strings.TrimSpace(e)
+			if e == api.AwsChunked { // probably we should also check position of this header value
+				chunkedEncoding = true
+			} else {
+				resultContentEncoding = append(resultContentEncoding, e)
+			}
+		}
+	}
+	r.Header.Set(api.ContentEncoding, strings.Join(resultContentEncoding, ","))
+
+	if !chunkedEncoding && !h.cfg.Kludge.BypassContentEncodingInChunks() {
+		return nil, fmt.Errorf("%w: request is not chunk encoded, encodings '%s'",
+			errors.GetAPIError(errors.ErrInvalidEncodingMethod), strings.Join(encodings, ","))
+	}
+
 	decodeContentSize := r.Header.Get(api.AmzDecodedContentLength)
 	if len(decodeContentSize) == 0 {
 		return nil, errors.GetAPIError(errors.ErrMissingContentLength)