Repository navigation
Expand file tree
/
Copy pathcopy-part-range.go
More file actions
106 lines (94 loc) · 3.45 KB
/
Copy pathcopy-part-range.go
File metadata and controls
106 lines (94 loc) · 3.45 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
/*
* 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 (
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
)
// Writes S3 compatible copy part range error.
func writeCopyPartErr(w http.ResponseWriter, err error, url *url.URL) {
switch err {
case errInvalidRange:
writeErrorResponse(w, ErrInvalidCopyPartRange, url)
return
case errInvalidRangeSource:
writeErrorResponse(w, ErrInvalidCopyPartRangeSource, url)
return
default:
writeErrorResponse(w, ErrInternalError, url)
return
}
}
// Parses x-amz-copy-source-range for CopyObjectPart API. Specifically written to
// differentiate the behavior between regular httpRange header v/s x-amz-copy-source-range.
// The range of bytes to copy from the source object. The range value must use the form
// bytes=first-last, where the first and last are the zero-based byte offsets to copy.
// For example, bytes=0-9 indicates that you want to copy the first ten bytes of the source.
// http://docs.aws.amazon.com/AmazonS3/latest/API/mpUploadUploadPartCopy.html
func parseCopyPartRange(rangeString string, resourceSize int64) (hrange *httpRange, err error) {
// Return error if given range string doesn't start with byte range prefix.
if !strings.HasPrefix(rangeString, byteRangePrefix) {
return nil, fmt.Errorf("'%s' does not start with '%s'", rangeString, byteRangePrefix)
}
// Trim byte range prefix.
byteRangeString := strings.TrimPrefix(rangeString, byteRangePrefix)
// Check if range string contains delimiter '-', else return error. eg. "bytes=8"
sepIndex := strings.Index(byteRangeString, "-")
if sepIndex == -1 {
return nil, errInvalidRange
}
offsetBeginString := byteRangeString[:sepIndex]
offsetBegin := int64(-1)
// Convert offsetBeginString only if its not empty.
if len(offsetBeginString) > 0 {
if !validBytePos.MatchString(offsetBeginString) {
return nil, errInvalidRange
}
if offsetBegin, err = strconv.ParseInt(offsetBeginString, 10, 64); err != nil {
return nil, errInvalidRange
}
}
offsetEndString := byteRangeString[sepIndex+1:]
offsetEnd := int64(-1)
// Convert offsetEndString only if its not empty.
if len(offsetEndString) > 0 {
if !validBytePos.MatchString(offsetEndString) {
return nil, errInvalidRange
}
if offsetEnd, err = strconv.ParseInt(offsetEndString, 10, 64); err != nil {
return nil, errInvalidRange
}
}
// rangeString contains first byte positions. eg. "bytes=2-" or
// rangeString contains last bye positions. eg. "bytes=-2"
if offsetBegin == -1 || offsetEnd == -1 {
return nil, errInvalidRange
}
// Last byte position should not be greater than first byte
// position. eg. "bytes=5-2"
if offsetBegin > offsetEnd {
return nil, errInvalidRange
}
// First and last byte positions should not be >= resourceSize.
if offsetBegin >= resourceSize || offsetEnd >= resourceSize {
return nil, errInvalidRangeSource
}
// Success..
return &httpRange{offsetBegin, offsetEnd, resourceSize}, nil
}