OP#792 initial commit after fork

cmd/copy-part-range.go

@@ -0,0 +1,72 @@
+// Copyright (c) 2015-2021 MinIO, Inc.
+//
+// This file is part of MinIO Object Storage stack
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package cmd
+
+import (
+	"context"
+	"net/http"
+	"net/url"
+)
+
+// Writes S3 compatible copy part range error.
+func writeCopyPartErr(ctx context.Context, w http.ResponseWriter, err error, url *url.URL) {
+	switch err {
+	case errInvalidRange:
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidCopyPartRange), url)
+		return
+	case errInvalidRangeSource:
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidCopyPartRangeSource), url)
+		return
+	default:
+		apiErr := errorCodes.ToAPIErr(ErrInvalidCopyPartRangeSource)
+		apiErr.Description = err.Error()
+		writeErrorResponse(ctx, w, apiErr, url)
+		return
+	}
+}
+
+// Parses x-amz-copy-source-range for CopyObjectPart API. Its behavior
+// is different from regular HTTP range header. It only supports the
+// form `bytes=first-last` where first and last are zero-based byte
+// offsets. See
+// http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadUploadPartCopy.html
+// for full details. This function treats an empty rangeString as
+// referring to the whole resource.
+func parseCopyPartRangeSpec(rangeString string) (hrange *HTTPRangeSpec, err error) {
+	hrange, err = parseRequestRangeSpec(rangeString)
+	if err != nil {
+		return nil, err
+	}
+	if hrange.IsSuffixLength || hrange.Start < 0 || hrange.End < 0 {
+		return nil, errInvalidRange
+	}
+	return hrange, nil
+}
+
+// checkCopyPartRangeWithSize adds more check to the range string in case of
+// copy object part. This API requires having specific start and end  range values
+// e.g. 'bytes=3-10'. Other use cases will be rejected.
+func checkCopyPartRangeWithSize(rs *HTTPRangeSpec, resourceSize int64) (err error) {
+	if rs == nil {
+		return nil
+	}
+	if rs.IsSuffixLength || rs.Start >= resourceSize || rs.End >= resourceSize {
+		return errInvalidRangeSource
+	}
+	return nil
+}