a16b469d9b
Upstream, chihaya reads this header in order to find the kid in the list of maintained keys. A long time ago, it used to just iterate, but now it needs to know the kid.
130 lines
3.7 KiB
Python
130 lines
3.7 KiB
Python
import hashlib
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import time
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from binascii import hexlify
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from cachetools import lru_cache
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import bencode
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import jwt
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import resumablehashlib
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from app import app, instance_keys
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ANNOUNCE_URL = app.config['BITTORRENT_ANNOUNCE_URL']
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FILENAME_PEPPER = app.config['BITTORRENT_FILENAME_PEPPER']
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REGISTRY_TITLE = app.config['REGISTRY_TITLE']
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@lru_cache(maxsize=1)
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def _load_private_key(private_key_file_path):
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with open(private_key_file_path) as private_key_file:
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return private_key_file.read()
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def jwt_from_infodict(infodict):
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""" Returns an encoded JWT for the given BitTorrent info dict, signed by the local instance's
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private key.
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"""
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digest = hashlib.sha1()
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digest.update(bencode.bencode(infodict))
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return jwt_from_infohash(digest.digest())
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def jwt_from_infohash(infohash_digest):
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""" Returns an encoded JWT for the given BitTorrent infohash, signed by the local instance's
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private key.
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"""
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token_data = {
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'iss': instance_keys.service_name,
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'aud': ANNOUNCE_URL,
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'infohash': hexlify(infohash_digest),
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}
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return jwt.encode(token_data, instance_keys.local_private_key, algorithm='RS256',
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headers={'kid': instance_keys.local_key_id})
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def make_torrent(name, webseed, length, piece_length, pieces):
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info_dict = {
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'name': name,
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'length': length,
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'piece length': piece_length,
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'pieces': pieces,
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'private': 1,
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}
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return bencode.bencode({
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'announce': ANNOUNCE_URL + "?jwt=" + jwt_from_infodict(info_dict),
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'url-list': webseed,
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'encoding': 'UTF-8',
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'created by': REGISTRY_TITLE,
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'creation date': int(time.time()),
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'info': info_dict,
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})
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def public_torrent_filename(blob_uuid):
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return hashlib.sha256(blob_uuid).hexdigest()
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def per_user_torrent_filename(user_uuid, blob_uuid):
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return hashlib.sha256(FILENAME_PEPPER + "||" + blob_uuid + "||" + user_uuid).hexdigest()
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class PieceHasher(object):
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""" Utility for computing torrent piece hashes as the data flows through the update
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method of this class. Users should get the final value by calling final_piece_hashes
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since new chunks are allocated lazily.
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"""
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def __init__(self, piece_size, starting_offset=0, starting_piece_hash_bytes='',
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hash_fragment_to_resume=None):
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if not isinstance(starting_offset, (int, long)):
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raise TypeError('starting_offset must be an integer')
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elif not isinstance(piece_size, (int, long)):
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raise TypeError('piece_size must be an integer')
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self._current_offset = starting_offset
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self._piece_size = piece_size
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self._piece_hashes = bytearray(starting_piece_hash_bytes)
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if hash_fragment_to_resume is None:
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self._hash_fragment = resumablehashlib.sha1()
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else:
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self._hash_fragment = hash_fragment_to_resume
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def update(self, buf):
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buf_offset = 0
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while buf_offset < len(buf):
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buf_bytes_to_hash = buf[0:self._piece_length_remaining()]
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to_hash_len = len(buf_bytes_to_hash)
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if self._piece_offset() == 0 and to_hash_len > 0 and self._current_offset > 0:
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# We are opening a new piece
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self._piece_hashes.extend(self._hash_fragment.digest())
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self._hash_fragment = resumablehashlib.sha1()
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self._hash_fragment.update(buf_bytes_to_hash)
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self._current_offset += to_hash_len
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buf_offset += to_hash_len
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@property
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def hashed_bytes(self):
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return self._current_offset
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def _piece_length_remaining(self):
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return self._piece_size - (self._current_offset % self._piece_size)
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def _piece_offset(self):
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return self._current_offset % self._piece_size
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@property
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def piece_hashes(self):
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return self._piece_hashes
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@property
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def hash_fragment(self):
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return self._hash_fragment
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def final_piece_hashes(self):
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return self._piece_hashes + self._hash_fragment.digest()
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