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# Copyright 2008 The Tor Project, Inc. See LICENSE for licensing information.
import os.path
import time
import thandy.master_keys
no_bt = None
try:
import BitTorrent.bencode
import BitTorrent.btformats
import BitTorrent.download
except ImportError:
no_bt = True
from sha import sha # XXX Use PyCrypto here?
class BtCompat:
"""Interface for different bittorrent implementations"""
usingBt = False
def __init__(self):
self.tUrl = thandy.master_keys.DEFAULT_TRACKER
if not no_bt:
assert(self.tUrl is not None and self.tUrl != "")
self.pieceLength = 2 ** 18 # Piece length of 262144 bytes
# XXX Do we need to be thread-safe here and below?
@staticmethod
def shouldUseBt():
return BtCompat.usingBt
@staticmethod
def setUseBt(useBt):
if no_bt:
return
BtCompat.usingBt = useBt
@staticmethod
def getBtMetadataLocation(packagepath, filepath, pathprefix=""):
"""Given a path for the package, the path for a file of that
package, and an optional prefix, return the path for the
.torrent metadata file. Always return Unix-like paths, to
ensure compatibility with fetching the path from a
webserver.
"""
return (os.path.join(pathprefix, os.path.dirname(packagepath),
os.path.basename(filepath)) + ".torrent"
).replace("\\", "/")
def makeMetaFile(self, file):
"""Given a path to a file, create the contents of a .torrent
metadata file and return them.
"""
size = os.path.getsize(file)
filename = os.path.basename(file)
pieces = []
p = 0
h = open(file, 'rb')
while p < size:
x = h.read(min(self.pieceLength, size - p))
pieces.append(sha(x).digest())
p += self.pieceLength
if p > size:
p = size
h.close()
info = {'pieces': ''.join(pieces),
'piece length': self.pieceLength, 'length': size,
'name': filename}
# Check we didn't screw up with the info
BitTorrent.btformats.check_info(info)
data = {'info': info, 'announce': self.tUrl,
'creation date': long(time.time())}
return BitTorrent.bencode.bencode(data)
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