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- # Written by Bram Cohen
- # see LICENSE.txt for license information
-
- from types import StringType, LongType, IntType, ListType, DictType
- from re import compile
-
- reg = compile(r'^[^/\\.~][^/\\]*$')
-
- ints = (LongType, IntType)
-
- def check_info(info):
- if type(info) != DictType:
- raise ValueError, 'bad metainfo - not a dictionary'
- pieces = info.get('pieces')
- if type(pieces) != StringType or len(pieces) % 20 != 0:
- raise ValueError, 'bad metainfo - bad pieces key'
- piecelength = info.get('piece length')
- if type(piecelength) not in ints or piecelength <= 0:
- raise ValueError, 'bad metainfo - illegal piece length'
- name = info.get('name')
- if type(name) != StringType:
- raise ValueError, 'bad metainfo - bad name'
- if not reg.match(name):
- raise ValueError, 'name %s disallowed for security reasons' % name
- if info.has_key('files') == info.has_key('length'):
- raise ValueError, 'single/multiple file mix'
- if info.has_key('length'):
- length = info.get('length')
- if type(length) not in ints or length < 0:
- raise ValueError, 'bad metainfo - bad length'
- else:
- files = info.get('files')
- if type(files) != ListType:
- raise ValueError
- for f in files:
- if type(f) != DictType:
- raise ValueError, 'bad metainfo - bad file value'
- length = f.get('length')
- if type(length) not in ints or length < 0:
- raise ValueError, 'bad metainfo - bad length'
- path = f.get('path')
- if type(path) != ListType or path == []:
- raise ValueError, 'bad metainfo - bad path'
- for p in path:
- if type(p) != StringType:
- raise ValueError, 'bad metainfo - bad path dir'
- if not reg.match(p):
- raise ValueError, 'path %s disallowed for security reasons' % p
- for i in xrange(len(files)):
- for j in xrange(i):
- if files[i]['path'] == files[j]['path']:
- raise ValueError, 'bad metainfo - duplicate path'
-
- def check_message(message):
- if type(message) != DictType:
- raise ValueError
- check_info(message.get('info'))
- announce = message.get('announce')
- if type(announce) != StringType or len(announce) == 0:
- raise ValueError, 'bad torrent file - announce is invalid'
-
- def check_peers(message):
- if type(message) != DictType:
- raise ValueError
- if message.has_key('failure reason'):
- if type(message['failure reason']) != StringType:
- raise ValueError
- return
- peers = message.get('peers')
- if type(peers) == ListType:
- for p in peers:
- if type(p) != DictType:
- raise ValueError
- if type(p.get('ip')) != StringType:
- raise ValueError
- port = p.get('port')
- if type(port) not in ints or p <= 0:
- raise ValueError
- if p.has_key('peer id'):
- id = p.get('peer id')
- if type(id) != StringType or len(id) != 20:
- raise ValueError
- elif type(peers) != StringType or len(peers) % 6 != 0:
- raise ValueError
- interval = message.get('interval', 1)
- if type(interval) not in ints or interval <= 0:
- raise ValueError
- minint = message.get('min interval', 1)
- if type(minint) not in ints or minint <= 0:
- raise ValueError
- if type(message.get('tracker id', '')) != StringType:
- raise ValueError
- npeers = message.get('num peers', 0)
- if type(npeers) not in ints or npeers < 0:
- raise ValueError
- dpeers = message.get('done peers', 0)
- if type(dpeers) not in ints or dpeers < 0:
- raise ValueError
- last = message.get('last', 0)
- if type(last) not in ints or last < 0:
- raise ValueError
-