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package models
import (
"bytes"
"crypto/sha1"
"fmt"
"os"
"strings"
"time"
"github.com/felix/dhtsearch/bencode"
"github.com/felix/dhtsearch/krpc"
)
// Data for persistent storage
type Torrent struct {
ID int `json:"-"`
Infohash Infohash `json:"infohash"`
Name string `json:"name"`
Files []File `json:"files" db:"-"`
Size int `json:"size"`
Updated time.Time `json:"updated"`
Created time.Time `json:"created"`
Tags []string `json:"tags" db:"-"`
}
type File struct {
ID int `json:"-"`
Path string `json:"path"`
Size int `json:"size"`
TorrentID int `json:"torrent_id" db:"torrent_id"`
}
func InfohashMatchesMetadata(ih Infohash, md []byte) bool {
info := sha1.Sum(md)
return bytes.Equal([]byte(ih), info[:])
}
func TorrentFromMetadata(ih Infohash, md []byte) (*Torrent, error) {
if !InfohashMatchesMetadata(ih, md) {
return nil, fmt.Errorf("infohash does not match metadata")
}
info, _, err := bencode.DecodeDict(md, 0)
if err != nil {
return nil, err
}
// Get the directory or advisory filename
name, err := krpc.GetString(info, "name")
if err != nil {
return nil, err
}
bt := Torrent{
Infohash: ih,
Name: name,
}
if files, err := krpc.GetList(info, "files"); err == nil {
// Multiple file mode
bt.Files = make([]File, len(files))
// Files is a list of dicts
for i, item := range files {
file := item.(map[string]interface{})
// Paths is a list of strings
paths := file["path"].([]interface{})
path := make([]string, len(paths))
for j, p := range paths {
path[j] = p.(string)
}
fSize, err := krpc.GetInt(file, "length")
if err != nil {
return nil, err
}
bt.Files[i] = File{
// Assume Unix path sep?
Path: strings.Join(path[:], string(os.PathSeparator)),
Size: fSize,
}
// Ensure the torrent size totals all files'
bt.Size = bt.Size + fSize
}
} else if length, err := krpc.GetInt(info, "length"); err == nil {
// Single file mode
bt.Size = length
} else {
return nil, fmt.Errorf("found neither length or files")
}
return &bt, nil
}
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