Initial commit based on https://github.com/minio/minio/releases/tag/RELEASE.2020-07-02T00-15-09Z

cmd/copy-part-range.go

@@ -0,0 +1,69 @@
+/*
+ * MinIO Cloud Storage, (C) 2017 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+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, browser bool) {
+	switch err {
+	case errInvalidRange:
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidCopyPartRange), url, browser)
+		return
+	case errInvalidRangeSource:
+		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidCopyPartRangeSource), url, browser)
+		return
+	default:
+		writeErrorResponse(ctx, w, toAPIError(ctx, err), url, browser)
+		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
+}