fix upload of zero file sizes

internal/http/services/owncloud/ocdav/put.go

@@ -250,39 +250,37 @@ func (s *svc) handlePut(ctx context.Context, w http.ResponseWriter, r *http.Requ
 		}
 	}
 
-	if length > 0 {
-		httpReq, err := rhttp.NewRequest(ctx, http.MethodPut, ep, r.Body)
-		if err != nil {
-			w.WriteHeader(http.StatusInternalServerError)
-			return
-		}
-		httpReq.Header.Set(datagateway.TokenTransportHeader, token)
+	httpReq, err := rhttp.NewRequest(ctx, http.MethodPut, ep, r.Body)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+	httpReq.Header.Set(datagateway.TokenTransportHeader, token)
 
-		httpRes, err := s.client.Do(httpReq)
-		if err != nil {
-			log.Error().Err(err).Msg("error doing PUT request to data service")
-			w.WriteHeader(http.StatusInternalServerError)
+	httpRes, err := s.client.Do(httpReq)
+	if err != nil {
+		log.Error().Err(err).Msg("error doing PUT request to data service")
+		w.WriteHeader(http.StatusInternalServerError)
+		return
+	}
+	defer httpRes.Body.Close()
+	if httpRes.StatusCode != http.StatusOK {
+		if httpRes.StatusCode == http.StatusPartialContent {
+			w.WriteHeader(http.StatusPartialContent)
 			return
 		}
-		defer httpRes.Body.Close()
-		if httpRes.StatusCode != http.StatusOK {
-			if httpRes.StatusCode == http.StatusPartialContent {
-				w.WriteHeader(http.StatusPartialContent)
-				return
-			}
-			if httpRes.StatusCode == errtypes.StatusChecksumMismatch {
-				w.WriteHeader(http.StatusBadRequest)
-				b, err := Marshal(exception{
-					code:    SabredavBadRequest,
-					message: "The computed checksum does not match the one received from the client.",
-				})
-				HandleWebdavError(&log, w, b, err)
-				return
-			}
-			log.Error().Err(err).Msg("PUT request to data server failed")
-			w.WriteHeader(httpRes.StatusCode)
+		if httpRes.StatusCode == errtypes.StatusChecksumMismatch {
+			w.WriteHeader(http.StatusBadRequest)
+			b, err := Marshal(exception{
+				code:    SabredavBadRequest,
+				message: "The computed checksum does not match the one received from the client.",
+			})
+			HandleWebdavError(&log, w, b, err)
 			return
 		}
+		log.Error().Err(err).Msg("PUT request to data server failed")
+		w.WriteHeader(httpRes.StatusCode)
+		return
 	}
 
 	ok, err := chunking.IsChunked(ref.Path)