You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
128 lines
2.9 KiB
128 lines
2.9 KiB
/*
|
|
* Minio Cloud Storage, (C) 2015 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 main
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"strconv"
|
|
"strings"
|
|
)
|
|
|
|
const (
|
|
b = "bytes="
|
|
)
|
|
|
|
// InvalidRange - invalid range
|
|
type InvalidRange struct{}
|
|
|
|
func (e InvalidRange) Error() string {
|
|
return "The requested range is not satisfiable"
|
|
}
|
|
|
|
// HttpRange specifies the byte range to be sent to the client.
|
|
type httpRange struct {
|
|
start, length, size int64
|
|
}
|
|
|
|
// String populate range stringer interface
|
|
func (r *httpRange) String() string {
|
|
return fmt.Sprintf("bytes %d-%d/%d", r.start, r.start+r.length-1, r.size)
|
|
}
|
|
|
|
// Grab new range from request header
|
|
func getRequestedRange(hrange string, size int64) (*httpRange, error) {
|
|
r := &httpRange{
|
|
start: 0,
|
|
length: 0,
|
|
size: 0,
|
|
}
|
|
r.size = size
|
|
if hrange != "" {
|
|
err := r.parseRange(hrange)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return r, nil
|
|
}
|
|
|
|
func (r *httpRange) parse(ra string) error {
|
|
i := strings.Index(ra, "-")
|
|
if i < 0 {
|
|
return InvalidRange{}
|
|
}
|
|
start, end := strings.TrimSpace(ra[:i]), strings.TrimSpace(ra[i+1:])
|
|
if start == "" {
|
|
// If no start is specified, end specifies the
|
|
// range start relative to the end of the file.
|
|
i, err := strconv.ParseInt(end, 10, 64)
|
|
if err != nil {
|
|
return InvalidRange{}
|
|
}
|
|
if i > r.size {
|
|
i = r.size
|
|
}
|
|
r.start = r.size - i
|
|
r.length = r.size - r.start
|
|
} else {
|
|
i, err := strconv.ParseInt(start, 10, 64)
|
|
if err != nil || i > r.size || i < 0 {
|
|
return InvalidRange{}
|
|
}
|
|
r.start = i
|
|
if end == "" {
|
|
// If no end is specified, range extends to end of the file.
|
|
r.length = r.size - r.start
|
|
} else {
|
|
i, err := strconv.ParseInt(end, 10, 64)
|
|
if err != nil || r.start > i {
|
|
return InvalidRange{}
|
|
}
|
|
if i >= r.size {
|
|
i = r.size - 1
|
|
}
|
|
r.length = i - r.start + 1
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// parseRange parses a Range header string as per RFC 2616.
|
|
func (r *httpRange) parseRange(s string) error {
|
|
if s == "" {
|
|
return errors.New("header not present")
|
|
}
|
|
if !strings.HasPrefix(s, b) {
|
|
return InvalidRange{}
|
|
}
|
|
|
|
ras := strings.Split(s[len(b):], ",")
|
|
if len(ras) == 0 {
|
|
return errors.New("invalid request")
|
|
}
|
|
// Just pick the first one and ignore the rest, we only support one range per object
|
|
if len(ras) > 1 {
|
|
return errors.New("multiple ranges specified")
|
|
}
|
|
|
|
ra := strings.TrimSpace(ras[0])
|
|
if ra == "" {
|
|
return InvalidRange{}
|
|
}
|
|
return r.parse(ra)
|
|
}
|
|
|