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106 lines
3.4 KiB
106 lines
3.4 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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"fmt"
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"net/http"
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"net/url"
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"strconv"
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"strings"
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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. Specifically written to
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// differentiate the behavior between regular httpRange header v/s x-amz-copy-source-range.
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// The range of bytes to copy from the source object. The range value must use the form
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// bytes=first-last, where the first and last are the zero-based byte offsets to copy.
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// For example, bytes=0-9 indicates that you want to copy the first ten bytes of the source.
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// http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadUploadPartCopy.html
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func parseCopyPartRange(rangeString string, resourceSize int64) (hrange *httpRange, err error) {
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// Return error if given range string doesn't start with byte range prefix.
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if !strings.HasPrefix(rangeString, byteRangePrefix) {
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return nil, fmt.Errorf("'%s' does not start with '%s'", rangeString, byteRangePrefix)
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}
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// Trim byte range prefix.
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byteRangeString := strings.TrimPrefix(rangeString, byteRangePrefix)
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// Check if range string contains delimiter '-', else return error. eg. "bytes=8"
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sepIndex := strings.Index(byteRangeString, "-")
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if sepIndex == -1 {
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return nil, errInvalidRange
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}
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offsetBeginString := byteRangeString[:sepIndex]
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offsetBegin := int64(-1)
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// Convert offsetBeginString only if its not empty.
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if len(offsetBeginString) > 0 {
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if !validBytePos.MatchString(offsetBeginString) {
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return nil, errInvalidRange
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}
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if offsetBegin, err = strconv.ParseInt(offsetBeginString, 10, 64); err != nil {
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return nil, errInvalidRange
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}
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}
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offsetEndString := byteRangeString[sepIndex+1:]
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offsetEnd := int64(-1)
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// Convert offsetEndString only if its not empty.
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if len(offsetEndString) > 0 {
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if !validBytePos.MatchString(offsetEndString) {
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return nil, errInvalidRange
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}
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if offsetEnd, err = strconv.ParseInt(offsetEndString, 10, 64); err != nil {
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return nil, errInvalidRange
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}
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}
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// rangeString contains first byte positions. eg. "bytes=2-" or
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// rangeString contains last bye positions. eg. "bytes=-2"
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if offsetBegin == -1 || offsetEnd == -1 {
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return nil, errInvalidRange
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}
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// Last byte position should not be greater than first byte
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// position. eg. "bytes=5-2"
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if offsetBegin > offsetEnd {
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return nil, errInvalidRange
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}
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// First and last byte positions should not be >= resourceSize.
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if offsetBegin >= resourceSize || offsetEnd >= resourceSize {
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return nil, errInvalidRangeSource
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}
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// Success..
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return &httpRange{offsetBegin, offsetEnd, resourceSize}, nil
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}
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