88 lines
2.2 KiB
Go
88 lines
2.2 KiB
Go
package metainfo
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import (
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"io"
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"os"
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"time"
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"github.com/anacrolix/torrent/bencode"
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)
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type MetaInfo struct {
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InfoBytes bencode.Bytes `bencode:"info"`
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Announce string `bencode:"announce,omitempty"`
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AnnounceList AnnounceList `bencode:"announce-list,omitempty"`
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Nodes []Node `bencode:"nodes,omitempty"`
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CreationDate int64 `bencode:"creation date,omitempty"`
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Comment string `bencode:"comment,omitempty"`
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CreatedBy string `bencode:"created by,omitempty"`
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Encoding string `bencode:"encoding,omitempty"`
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UrlList UrlList `bencode:"url-list,omitempty"`
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}
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// Load a MetaInfo from an io.Reader. Returns a non-nil error in case of
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// failure.
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func Load(r io.Reader) (*MetaInfo, error) {
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var mi MetaInfo
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d := bencode.NewDecoder(r)
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err := d.Decode(&mi)
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if err != nil {
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return nil, err
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}
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return &mi, nil
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}
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// Convenience function for loading a MetaInfo from a file.
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func LoadFromFile(filename string) (*MetaInfo, error) {
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f, err := os.Open(filename)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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return Load(f)
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}
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func (mi MetaInfo) UnmarshalInfo() (info Info, err error) {
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err = bencode.Unmarshal(mi.InfoBytes, &info)
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return
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}
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func (mi MetaInfo) HashInfoBytes() (infoHash Hash) {
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return HashBytes(mi.InfoBytes)
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}
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// Encode to bencoded form.
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func (mi MetaInfo) Write(w io.Writer) error {
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return bencode.NewEncoder(w).Encode(mi)
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}
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// Set good default values in preparation for creating a new MetaInfo file.
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func (mi *MetaInfo) SetDefaults() {
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mi.Comment = "yoloham"
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mi.CreatedBy = "github.com/anacrolix/torrent"
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mi.CreationDate = time.Now().Unix()
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// mi.Info.PieceLength = 256 * 1024
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}
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// Creates a Magnet from a MetaInfo.
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func (mi *MetaInfo) Magnet(displayName string, infoHash Hash) (m Magnet) {
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for t := range mi.UpvertedAnnounceList().DistinctValues() {
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m.Trackers = append(m.Trackers, t)
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}
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m.DisplayName = displayName
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m.InfoHash = infoHash
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return
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}
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// Returns the announce list converted from the old single announce field if
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// necessary.
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func (mi *MetaInfo) UpvertedAnnounceList() AnnounceList {
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if mi.AnnounceList.OverridesAnnounce(mi.Announce) {
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return mi.AnnounceList
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}
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if mi.Announce != "" {
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return [][]string{[]string{mi.Announce}}
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}
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return nil
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}
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