def torrent2magnet(torrent, rich=False):
metadata = bencode.bdecode(torrent)
hashcontents = bencode.bencode(metadata['info'])
digest = hashlib.sha1(hashcontents).digest()
b32hash = base64.b32encode(digest)
magnet = 'magnet:?xt=urn:btih:{}'.format(b32hash)
if rich:
params = ObjectDict()
params.xt = 'urn:btih:{}'.format(b32hash)
params.dn = metadata['info']['name']
params.tr = metadata['announce']
if 'length' in metadata['info']:
params.xl = metadata['info']['length']
paramstr = urllib.urlencode(params)
magnet = 'magnet:?{}'.format(paramstr)
return magnet, metadata['info']
