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98 lines
1.9 KiB
98 lines
1.9 KiB
package main
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import (
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"bytes"
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"crypto/sha1"
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"fmt"
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"io"
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"net/http"
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"os"
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"path"
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"time"
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"github.com/zeebo/bencode"
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"github.com/zenazn/goji/web"
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)
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const (
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TORRENT_PIECE_LENGTH = 262144
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)
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type TorrentInfo struct {
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PieceLength int `bencode:"piece length"`
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Pieces string `bencode:"pieces"`
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Name string `bencode:"name"`
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Length int `bencode:"length"`
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}
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type Torrent struct {
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Encoding string `bencode:"encoding"`
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Info TorrentInfo `bencode:"info"`
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UrlList []string `bencode:"url-list"`
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}
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func hashPiece(piece []byte) []byte {
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h := sha1.New()
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h.Write(piece)
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return h.Sum(nil)
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}
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func CreateTorrent(fileName string, filePath string) ([]byte, error) {
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chunk := make([]byte, TORRENT_PIECE_LENGTH)
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torrent := Torrent{
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Encoding: "UTF-8",
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Info: TorrentInfo{
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PieceLength: TORRENT_PIECE_LENGTH,
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Name: fileName,
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},
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UrlList: []string{fmt.Sprintf("%sselif/%s", Config.siteURL, fileName)},
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}
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f, err := os.Open(filePath)
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if err != nil {
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return []byte{}, err
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}
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for {
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n, err := f.Read(chunk)
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if err == io.EOF {
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break
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} else if err != nil {
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return []byte{}, err
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}
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torrent.Info.Length += n
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torrent.Info.Pieces += string(hashPiece(chunk[:n]))
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}
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f.Close()
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data, err := bencode.EncodeBytes(&torrent)
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if err != nil {
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return []byte{}, err
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}
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return data, nil
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}
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func fileTorrentHandler(c web.C, w http.ResponseWriter, r *http.Request) {
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fileName := c.URLParams["name"]
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filePath := path.Join(Config.filesDir, fileName)
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if !fileExistsAndNotExpired(fileName) {
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notFoundHandler(c, w, r)
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return
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}
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encoded, err := CreateTorrent(fileName, filePath)
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if err != nil {
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oopsHandler(c, w, r) // 500 - creating torrent failed
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return
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}
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w.Header().Set(`Content-Disposition`, fmt.Sprintf(`attachment; filename="%s.torrent"`, fileName))
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http.ServeContent(w, r, "", time.Now(), bytes.NewReader(encoded))
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}
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// vim:set ts=8 sw=8 noet:
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