115 lines
3 KiB
Go
115 lines
3 KiB
Go
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package torrent
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import (
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//"github.com/vbatts/go-bt/bencode"
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"crypto/sha1"
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)
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/*
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map[string]interface {}{"announce":"http://torrent.fedoraproject.org:6969/announce", "creation date":1387244350, "info":map[string]interface {}{"files":[]interface {}{map[string]interface {}{"length":1125, "path":[]interface {}{"Fedora-20-x86_64-CHECKSUM"}}, map[string]interface {}{"length":4603248640, "path":[]interface {}{"Fedora-20-x86_64-DVD.iso"}}}, "name":"Fedora-20-x86_64-DVD", "piece length":262144, "pieces":"m\x
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*/
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type File struct {
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// URL of a main tracker
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Announce string "announce"
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// Epoch of the creation of this torrent
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CreationDate int64 "creation date"
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// Dictionary about this torrent, including files to be tracked
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Info TorrentFileInfo "info"
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}
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type TorrentFileInfo struct {
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// suggested file/directory name where the file(s) are to be saved
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Name string "name"
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// hash list of joined SHA1 sums (160-bit length)
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Pieces string "pieces"
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// number of bytes per piece
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PieceLength int64 "piece length"
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// size of the file in bytes (only if this torrent is for a single file)
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Length int64 "length"
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// list of information about the files
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Files []FileInfo "files"
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}
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func (tfi TorrentFileInfo) PiecesList() []string {
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pieces := []string{}
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for i := 0; i < (len(tfi.Pieces) / sha1.Size); i++ {
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pieces = append(pieces, tfi.Pieces[i*sha1.Size:(i+1)*sha1.Size])
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}
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return pieces
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}
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type FileInfo struct {
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// size of file in bytes
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Length int64 "length"
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// list of strings corresponding to subdirectory names, the last of which is the actual file name
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Path []string "path"
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}
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type torrentError struct {
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Msg string
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}
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func (te torrentError) Error() string {
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return te.Msg
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}
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var (
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ErrNotProperDataInterface = torrentError{"data does not look like map[string]interface{}"}
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)
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func DecocdeTorrentData(data interface{}) (*File, error) {
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m, ok := data.(map[string]interface{})
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if !ok {
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return nil, ErrNotProperDataInterface
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}
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announce := m["announce"].(string)
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creationDate := m["creation date"].(int64)
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info := m["info"].(map[string]interface{})
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pieceLength := info["piece length"].(int64)
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pieces := info["pieces"].(string)
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infoName := info["name"].(string)
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isSingleFileTorrent := true
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infoFiles, ok := info["files"].([]interface{})
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if ok {
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isSingleFileTorrent = false
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}
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infoLength := int64(0)
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if isSingleFileTorrent {
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infoLength = info["length"].(int64)
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}
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files := []FileInfo{}
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if !isSingleFileTorrent {
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for _, fileInterface := range infoFiles {
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fileInfo := fileInterface.(map[string]interface{})
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paths := []string{}
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for _, path := range fileInfo["path"].([]interface{}) {
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paths = append(paths, path.(string))
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}
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files = append(files, FileInfo{
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Length: fileInfo["length"].(int64),
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Path: paths,
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})
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}
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}
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return &File{
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Announce: announce,
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CreationDate: creationDate,
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Info: TorrentFileInfo{
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Name: infoName,
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Length: infoLength,
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Pieces: pieces,
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PieceLength: pieceLength,
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Files: files,
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},
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}, nil
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}
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