41 lines
1022 B
Go
41 lines
1022 B
Go
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package webseed
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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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"path"
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"strings"
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"github.com/anacrolix/torrent/metainfo"
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)
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func trailingPath(infoName string, pathComps []string) string {
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return path.Join(
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func() (ret []string) {
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for _, comp := range append([]string{infoName}, pathComps...) {
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ret = append(ret, url.QueryEscape(comp))
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}
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return
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}()...,
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)
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}
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// Creates a request per BEP 19.
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func NewRequest(url_ string, fileIndex int, info *metainfo.Info, offset, length int64) (*http.Request, error) {
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fileInfo := info.UpvertedFiles()[fileIndex]
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if strings.HasSuffix(url_, "/") {
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// BEP specifies that we append the file path. We need to escape each component of the path
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// for things like spaces and '#'.
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url_ += trailingPath(info.Name, fileInfo.Path)
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}
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req, err := http.NewRequest(http.MethodGet, url_, nil)
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if err != nil {
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return nil, err
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}
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if offset != 0 || length != fileInfo.Length {
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req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", offset, offset+length-1))
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}
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return req, nil
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}
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