status-go/vendor/github.com/anacrolix/torrent/webseed/request.go

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2022-03-10 09:44:48 +00:00
package webseed
import (
"fmt"
"net/http"
"net/url"
"path"
"strings"
"github.com/anacrolix/torrent/metainfo"
)
func trailingPath(infoName string, pathComps []string) string {
return path.Join(
func() (ret []string) {
for _, comp := range append([]string{infoName}, pathComps...) {
ret = append(ret, url.QueryEscape(comp))
}
return
}()...,
)
}
// Creates a request per BEP 19.
func NewRequest(url_ string, fileIndex int, info *metainfo.Info, offset, length int64) (*http.Request, error) {
fileInfo := info.UpvertedFiles()[fileIndex]
if strings.HasSuffix(url_, "/") {
// BEP specifies that we append the file path. We need to escape each component of the path
// for things like spaces and '#'.
url_ += trailingPath(info.Name, fileInfo.Path)
}
req, err := http.NewRequest(http.MethodGet, url_, nil)
if err != nil {
return nil, err
}
if offset != 0 || length != fileInfo.Length {
req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", offset, offset+length-1))
}
return req, nil
}