Rename more subpackages and modules

telethon/_network/connection/tcpintermediate.py

@@ -0,0 +1,46 @@
+import struct
+import random
+import os
+
+from .connection import Connection, PacketCodec
+
+
+class IntermediatePacketCodec(PacketCodec):
+    tag = b'\xee\xee\xee\xee'
+    obfuscate_tag = tag
+
+    def encode_packet(self, data):
+        return struct.pack('<i', len(data)) + data
+
+    async def read_packet(self, reader):
+        length = struct.unpack('<i', await reader.readexactly(4))[0]
+        return await reader.readexactly(length)
+
+
+class RandomizedIntermediatePacketCodec(IntermediatePacketCodec):
+    """
+    Data packets are aligned to 4bytes. This codec adds random bytes of size
+    from 0 to 3 bytes, which are ignored by decoder.
+    """
+    tag = None
+    obfuscate_tag = b'\xdd\xdd\xdd\xdd'
+
+    def encode_packet(self, data):
+        pad_size = random.randint(0, 3)
+        padding = os.urandom(pad_size)
+        return super().encode_packet(data + padding)
+
+    async def read_packet(self, reader):
+        packet_with_padding = await super().read_packet(reader)
+        pad_size = len(packet_with_padding) % 4
+        if pad_size > 0:
+            return packet_with_padding[:-pad_size]
+        return packet_with_padding
+
+
+class ConnectionTcpIntermediate(Connection):
+    """
+    Intermediate mode between `ConnectionTcpFull` and `ConnectionTcpAbridged`.
+    Always sends 4 extra bytes for the packet length.
+    """
+    packet_codec = IntermediatePacketCodec