func getMetaInfo(torrent string) (metaInfo *MetaInfo, err os.Error) {
var input io.ReadCloser
if strings.HasPrefix(torrent, "http:") {
// 6g compiler bug prevents us from writing r, _, err :=
var r *http.Response
if r, _, err = http.Get(torrent); err != nil {
return
}
input = r.Body
} else {
if input, err = os.Open(torrent, os.O_RDONLY, 0666); err != nil {
return
}
}
// We need to calcuate the sha1 of the Info map, including every value in the
// map. The easiest way to do this is to read the data using the Decode
// API, and then pick through it manually.
var m interface{}
m, err = bencode.Decode(input)
input.Close()
if err != nil {
err = os.NewError("Couldn't parse torrent file phase 1: " + err.String())
return
}
topMap, ok := m.(map[string]interface{})
if !ok {
err = os.NewError("Couldn't parse torrent file phase 2.")
return
}
infoMap, ok := topMap["info"]
if !ok {
err = os.NewError("Couldn't parse torrent file. info")
return
}
var b bytes.Buffer
if err = bencode.Marshal(&b, infoMap); err != nil {
return
}
hash := sha1.New()
hash.Write(b.Bytes())
var m2 MetaInfo
err = bencode.Unmarshal(&b, &m2.Info)
if err != nil {
return
}
m2.InfoHash = string(hash.Sum())
m2.Announce = getString(topMap, "announce")
m2.CreationDate = getString(topMap, "creation date")
m2.Comment = getString(topMap, "comment")
m2.CreatedBy = getString(topMap, "created by")
m2.Encoding = getString(topMap, "encoding")
metaInfo = &m2
return
}
func getTrackerInfo(url string) (tr *TrackerResponse, err os.Error) {
r, _, err := http.Get(url)
if err != nil {
return
}
defer r.Body.Close()
if r.StatusCode >= 400 {
data, _ := ioutil.ReadAll(r.Body)
reason := "Bad Request " + string(data)
log.Println(reason)
err = os.NewError(reason)
return
}
var tr2 TrackerResponse
err = bencode.Unmarshal(r.Body, &tr2)
r.Body.Close()
if err != nil {
return
}
tr = &tr2
return
}