rename, use namespaces

ox/torrent/btformats.py

@@ -0,0 +1,100 @@
+# 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'))
+    if type(message.get('announce')) != StringType:
+        raise ValueError
+
+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['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