fix: calculate correct content-range with partNumber query

fixes #11989
fixes #11824

cmd/api-errors.go

@@ -80,6 +80,7 @@ const (
 	ErrInvalidBucketName
 	ErrInvalidDigest
 	ErrInvalidRange
+	ErrInvalidRangePartNumber
 	ErrInvalidCopyPartRange
 	ErrInvalidCopyPartRangeSource
 	ErrInvalidMaxKeys
@@ -503,6 +504,11 @@ var errorCodes = errorCodeMap{
 		Description:    "The requested range is not satisfiable",
 		HTTPStatusCode: http.StatusRequestedRangeNotSatisfiable,
 	},
+	ErrInvalidRangePartNumber: {
+		Code:           "InvalidRequest",
+		Description:    "Cannot specify both Range header and partNumber query parameter",
+		HTTPStatusCode: http.StatusBadRequest,
+	},
 	ErrMalformedXML: {
 		Code:           "MalformedXML",
 		Description:    "The XML you provided was not well-formed or did not validate against our published schema.",

cmd/api-headers.go

@@ -156,16 +156,16 @@ func setObjectHeaders(w http.ResponseWriter, objInfo ObjectInfo, rs *HTTPRangeSp
 		return err
 	}
 
+	if rs == nil && opts.PartNumber > 0 {
+		rs = partNumberToRangeSpec(objInfo, opts.PartNumber)
+	}
+
 	// For providing ranged content
 	start, rangeLen, err = rs.GetOffsetLength(totalObjectSize)
 	if err != nil {
 		return err
 	}
 
-	if rs == nil && opts.PartNumber > 0 {
-		rs = partNumberToRangeSpec(objInfo, opts.PartNumber)
-	}
-
 	// Set content length.
 	w.Header().Set(xhttp.ContentLength, strconv.FormatInt(rangeLen, 10))
 	if rs != nil {

cmd/object-handlers.go

@@ -395,7 +395,7 @@ func (api objectAPIHandlers) GetObjectHandler(w http.ResponseWriter, r *http.Req
 
 	// Both 'bytes' and 'partNumber' cannot be specified at the same time
 	if rs != nil && opts.PartNumber > 0 {
-		writeErrorResponseHeadersOnly(w, errorCodes.ToAPIErr(ErrBadRequest))
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidRangePartNumber), r.URL, guessIsBrowserReq(r))
 		return
 	}
 
@@ -648,7 +648,7 @@ func (api objectAPIHandlers) HeadObjectHandler(w http.ResponseWriter, r *http.Re
 
 	// Both 'bytes' and 'partNumber' cannot be specified at the same time
 	if rs != nil && opts.PartNumber > 0 {
-		writeErrorResponseHeadersOnly(w, errorCodes.ToAPIErr(ErrBadRequest))
+		writeErrorResponseHeadersOnly(w, errorCodes.ToAPIErr(ErrInvalidRangePartNumber))
 		return
 	}