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96 lines
3.0 KiB
96 lines
3.0 KiB
/*
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* Minio Cloud Storage, (C) 2017 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"net/http"
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"net/url"
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)
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// Writes S3 compatible copy part range error.
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func writeCopyPartErr(w http.ResponseWriter, err error, url *url.URL) {
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switch err {
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case errInvalidRange:
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writeErrorResponse(w, ErrInvalidCopyPartRange, url)
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return
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case errInvalidRangeSource:
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writeErrorResponse(w, ErrInvalidCopyPartRangeSource, url)
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return
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default:
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writeErrorResponse(w, ErrInternalError, url)
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return
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}
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}
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// Parses x-amz-copy-source-range for CopyObjectPart API. Its behavior
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// is different from regular HTTP range header. It only supports the
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// form `bytes=first-last` where first and last are zero-based byte
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// offsets. See
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// http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadUploadPartCopy.html
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// for full details. This function treats an empty rangeString as
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// referring to the whole resource.
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//
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// In addition to parsing the range string, it also validates the
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// specified range against the given object size, so that Copy API
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// specific error can be returned.
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func parseCopyPartRange(rangeString string, resourceSize int64) (offset, length int64, err error) {
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var hrange *HTTPRangeSpec
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if rangeString != "" {
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hrange, err = parseRequestRangeSpec(rangeString)
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if err != nil {
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return -1, -1, err
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}
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// Require that both start and end are specified.
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if hrange.IsSuffixLength || hrange.Start == -1 || hrange.End == -1 {
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return -1, -1, errInvalidRange
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}
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// Validate specified range against object size.
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if hrange.Start >= resourceSize || hrange.End >= resourceSize {
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return -1, -1, errInvalidRangeSource
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}
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}
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return hrange.GetOffsetLength(resourceSize)
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}
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// parseCopyPartRangeSpec transforms a range string (e.g. bytes=3-4) to HTTPRangeSpec
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// and returns errors if weird values
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func parseCopyPartRangeSpec(rangeString string) (hrange *HTTPRangeSpec, err error) {
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hrange, err = parseRequestRangeSpec(rangeString)
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if err != nil {
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return nil, err
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}
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if hrange.IsSuffixLength || hrange.Start < 0 || hrange.End < 0 {
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return nil, errInvalidRange
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}
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return hrange, nil
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}
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// checkCopyPartRangeWithSize adds more check to the range string in case of
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// copy object part. This API requires having specific start and end range values
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// e.g. 'bytes=3-10'. Other use cases will be rejected.
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func checkCopyPartRangeWithSize(rs *HTTPRangeSpec, resourceSize int64) (err error) {
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if rs == nil {
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return nil
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}
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if rs.IsSuffixLength || rs.Start >= resourceSize || rs.End >= resourceSize {
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return errInvalidRangeSource
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}
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return nil
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}
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