9 "github.com/anacrolix/torrent/bencode"
12 type MetaInfo struct {
13 InfoBytes bencode.Bytes `bencode:"info,omitempty"` // BEP 3
14 Announce string `bencode:"announce,omitempty"` // BEP 3
15 AnnounceList AnnounceList `bencode:"announce-list,omitempty"` // BEP 12
16 Nodes []Node `bencode:"nodes,omitempty"` // BEP 5
17 // Where's this specified? Mentioned at
18 // https://wiki.theory.org/index.php/BitTorrentSpecification: (optional) the creation time of
19 // the torrent, in standard UNIX epoch format (integer, seconds since 1-Jan-1970 00:00:00 UTC)
20 CreationDate int64 `bencode:"creation date,omitempty,ignore_unmarshal_type_error"`
21 Comment string `bencode:"comment,omitempty"`
22 CreatedBy string `bencode:"created by,omitempty"`
23 Encoding string `bencode:"encoding,omitempty"`
24 UrlList UrlList `bencode:"url-list,omitempty"` // BEP 19 WebSeeds
27 // Load a MetaInfo from an io.Reader. Returns a non-nil error in case of
29 func Load(r io.Reader) (*MetaInfo, error) {
31 d := bencode.NewDecoder(r)
39 // Convenience function for loading a MetaInfo from a file.
40 func LoadFromFile(filename string) (*MetaInfo, error) {
41 f, err := os.Open(filename)
49 func (mi MetaInfo) UnmarshalInfo() (info Info, err error) {
50 err = bencode.Unmarshal(mi.InfoBytes, &info)
54 func (mi MetaInfo) HashInfoBytes() (infoHash Hash) {
55 return HashBytes(mi.InfoBytes)
58 // Encode to bencoded form.
59 func (mi MetaInfo) Write(w io.Writer) error {
60 return bencode.NewEncoder(w).Encode(mi)
63 // Set good default values in preparation for creating a new MetaInfo file.
64 func (mi *MetaInfo) SetDefaults() {
66 mi.CreatedBy = "github.com/anacrolix/torrent"
67 mi.CreationDate = time.Now().Unix()
68 // mi.Info.PieceLength = 256 * 1024
71 // Creates a Magnet from a MetaInfo. Optional infohash and parsed info can be provided.
72 func (mi *MetaInfo) Magnet(infoHash *Hash, info *Info) (m Magnet) {
73 m.Trackers = append(m.Trackers, mi.UpvertedAnnounceList().DistinctValues()...)
75 m.DisplayName = info.Name
78 m.InfoHash = *infoHash
80 m.InfoHash = mi.HashInfoBytes()
82 m.Params = make(url.Values)
83 m.Params["ws"] = mi.UrlList
87 // Returns the announce list converted from the old single announce field if
89 func (mi *MetaInfo) UpvertedAnnounceList() AnnounceList {
90 if mi.AnnounceList.OverridesAnnounce(mi.Announce) {
91 return mi.AnnounceList
93 if mi.Announce != "" {
94 return [][]string{{mi.Announce}}