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72bc9df683
This will allow you to, for example, send requests when you get an update (if someone tells you something, you can automatically reply something else). Beware, this may lead to an infinite loop so add conditions!
312 lines
12 KiB
Python
Executable File
312 lines
12 KiB
Python
Executable File
# This file is based on TLSharp
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# https://github.com/sochix/TLSharp/blob/master/TLSharp.Core/Network/MtProtoSender.cs
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import gzip
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from errors import *
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from time import sleep
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from threading import Thread, Lock
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import utils
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from crypto import AES
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from utils import BinaryWriter, BinaryReader
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from tl.types import MsgsAck
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from tl.all_tlobjects import tlobjects
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class MtProtoSender:
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"""MTProto Mobile Protocol sender (https://core.telegram.org/mtproto/description)"""
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def __init__(self, transport, session, check_updates=True):
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self.transport = transport
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self.session = session
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self.need_confirmation = [] # Message IDs that need confirmation
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self.on_update_handlers = []
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# Store a Lock instance to make this class safely multi-threaded
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self.lock = Lock()
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if check_updates:
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self.updates_thread = Thread(target=self.updates_thread_method, name='Updates thread')
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self.updates_thread_running = True
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self.updates_thread_receiving = False
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self.updates_thread.start()
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def disconnect(self):
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"""Disconnects and **stops all the running threads** if any"""
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self.updates_thread_running = False
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self.transport.cancel_receive()
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self.transport.close()
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def add_update_handler(self, handler):
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"""Adds an update handler (a method with one argument, the received
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TLObject) that is fired when there are updates available"""
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self.on_update_handlers.append(handler)
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def generate_sequence(self, confirmed):
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"""Generates the next sequence number, based on whether it
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was confirmed yet or not"""
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if confirmed:
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result = self.session.sequence * 2 + 1
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self.session.sequence += 1
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return result
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else:
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return self.session.sequence * 2
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# region Send and receive
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def send(self, request):
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"""Sends the specified MTProtoRequest, previously sending any message
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which needed confirmation. This also pauses the updates thread"""
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# Only cancel the receive *if* it was the
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# updates thread who was receiving. We do
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# not want to cancel other pending requests!
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if self.updates_thread_receiving:
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self.transport.cancel_receive()
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# Now only us can be using this method
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self.lock.acquire()
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# If any message needs confirmation send an AckRequest first
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if self.need_confirmation:
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msgs_ack = MsgsAck(self.need_confirmation)
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with BinaryWriter() as writer:
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msgs_ack.on_send(writer)
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self.send_packet(writer.get_bytes(), msgs_ack)
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del self.need_confirmation[:]
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# Finally send our packed request
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with BinaryWriter() as writer:
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request.on_send(writer)
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self.send_packet(writer.get_bytes(), request)
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# And update the saved session
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self.session.save()
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# Don't resume the updates thread yet,
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# since every send() is preceded by a receive()
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def receive(self, request):
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"""Receives the specified MTProtoRequest ("fills in it"
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the received data). This also restores the updates thread"""
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try:
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# Don't stop trying to receive until we get the request we wanted
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while not request.confirm_received:
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seq, body = self.transport.receive()
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message, remote_msg_id, remote_sequence = self.decode_msg(body)
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with BinaryReader(message) as reader:
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self.process_msg(remote_msg_id, remote_sequence, reader, request)
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finally:
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# Once we are done trying to get our request,
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# restore the updates thread and release the lock
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self.lock.release()
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# endregion
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# region Low level processing
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def send_packet(self, packet, request):
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"""Sends the given packet bytes with the additional
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information of the original request. This does NOT lock the threads!"""
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request.msg_id = self.session.get_new_msg_id()
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# First calculate plain_text to encrypt it
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with BinaryWriter() as plain_writer:
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plain_writer.write_long(self.session.salt, signed=False)
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plain_writer.write_long(self.session.id, signed=False)
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plain_writer.write_long(request.msg_id)
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plain_writer.write_int(self.generate_sequence(request.confirmed))
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plain_writer.write_int(len(packet))
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plain_writer.write(packet)
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msg_key = utils.calc_msg_key(plain_writer.get_bytes())
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key, iv = utils.calc_key(self.session.auth_key.key, msg_key, True)
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cipher_text = AES.encrypt_ige(plain_writer.get_bytes(), key, iv)
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# And then finally send the encrypted packet
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with BinaryWriter() as cipher_writer:
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cipher_writer.write_long(self.session.auth_key.key_id, signed=False)
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cipher_writer.write(msg_key)
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cipher_writer.write(cipher_text)
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self.transport.send(cipher_writer.get_bytes())
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def decode_msg(self, body):
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"""Decodes an received encrypted message body bytes"""
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message = None
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remote_msg_id = None
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remote_sequence = None
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with BinaryReader(body) as reader:
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if len(body) < 8:
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raise BufferError("Can't decode packet ({})".format(body))
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# TODO Check for both auth key ID and msg_key correctness
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remote_auth_key_id = reader.read_long()
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msg_key = reader.read(16)
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key, iv = utils.calc_key(self.session.auth_key.key, msg_key, False)
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plain_text = AES.decrypt_ige(reader.read(len(body) - reader.tell_position()), key, iv)
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with BinaryReader(plain_text) as plain_text_reader:
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remote_salt = plain_text_reader.read_long()
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remote_session_id = plain_text_reader.read_long()
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remote_msg_id = plain_text_reader.read_long()
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remote_sequence = plain_text_reader.read_int()
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msg_len = plain_text_reader.read_int()
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message = plain_text_reader.read(msg_len)
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return message, remote_msg_id, remote_sequence
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def process_msg(self, msg_id, sequence, reader, request, only_updates=False):
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"""Processes and handles a Telegram message. Optionally, this
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function will only check for updates (hence the request can be None)"""
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# TODO Check salt, session_id and sequence_number
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self.need_confirmation.append(msg_id)
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code = reader.read_int(signed=False)
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reader.seek(-4)
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# The following codes are "parsed manually" (and do not refer to an update)
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if not only_updates:
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if code == 0xf35c6d01: # rpc_result
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return self.handle_rpc_result(msg_id, sequence, reader, request)
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if code == 0x73f1f8dc: # msg_container
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return self.handle_container(msg_id, sequence, reader, request)
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if code == 0x3072cfa1: # gzip_packed
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return self.handle_gzip_packed(msg_id, sequence, reader, request)
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if code == 0xedab447b: # bad_server_salt
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return self.handle_bad_server_salt(msg_id, sequence, reader, request)
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if code == 0xa7eff811: # bad_msg_notification
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return self.handle_bad_msg_notification(msg_id, sequence, reader)
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# If the code is not parsed manually, then it was parsed by the code generator!
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# In this case, we will simply treat the incoming TLObject as an Update,
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# if we can first find a matching TLObject
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if code in tlobjects.keys():
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return self.handle_update(msg_id, sequence, reader)
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print('Unknown message: {}'.format(hex(code)))
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return False
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# endregion
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# region Message handling
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def handle_update(self, msg_id, sequence, reader):
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tlobject = reader.tgread_object()
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for handler in self.on_update_handlers:
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handler(tlobject)
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return False
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def handle_container(self, msg_id, sequence, reader, request):
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code = reader.read_int(signed=False)
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size = reader.read_int()
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for _ in range(size):
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inner_msg_id = reader.read_long(signed=False)
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inner_sequence = reader.read_int()
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inner_length = reader.read_int()
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begin_position = reader.tell_position()
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if not self.process_msg(inner_msg_id, sequence, reader, request):
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reader.set_position(begin_position + inner_length)
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return False
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def handle_bad_server_salt(self, msg_id, sequence, reader, mtproto_request):
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code = reader.read_int(signed=False)
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bad_msg_id = reader.read_long(signed=False)
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bad_msg_seq_no = reader.read_int()
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error_code = reader.read_int()
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new_salt = reader.read_long(signed=False)
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self.session.salt = new_salt
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# Resend
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self.send(mtproto_request)
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return True
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def handle_bad_msg_notification(self, msg_id, sequence, reader):
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code = reader.read_int(signed=False)
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request_id = reader.read_long(signed=False)
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request_sequence = reader.read_int()
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error_code = reader.read_int()
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raise BadMessageError(error_code)
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def handle_rpc_result(self, msg_id, sequence, reader, request):
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code = reader.read_int(signed=False)
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request_id = reader.read_long(signed=False)
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inner_code = reader.read_int(signed=False)
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if not request:
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raise ValueError('Cannot handle RPC results if no request was specified. '
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'This should only happen when the updates thread does not work properly.')
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if request_id == request.msg_id:
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request.confirm_received = True
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if inner_code == 0x2144ca19: # RPC Error
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error = RPCError(code=reader.read_int(), message=reader.tgread_string())
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if error.must_resend:
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request.confirm_received = False
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if error.message.startswith('FLOOD_WAIT_'):
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print('Should wait {}s. Sleeping until then.'.format(error.additional_data))
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sleep(error.additional_data)
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elif error.message.startswith('PHONE_MIGRATE_'):
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raise InvalidDCError(error.additional_data)
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else:
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raise error
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else:
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if inner_code == 0x3072cfa1: # GZip packed
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unpacked_data = gzip.decompress(reader.tgread_bytes())
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with BinaryReader(unpacked_data) as compressed_reader:
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request.on_response(compressed_reader)
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else:
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reader.seek(-4)
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request.on_response(reader)
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def handle_gzip_packed(self, msg_id, sequence, reader, mtproto_request):
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code = reader.read_int(signed=False)
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packed_data = reader.tgread_bytes()
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unpacked_data = gzip.decompress(packed_data)
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with BinaryReader(unpacked_data) as compressed_reader:
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self.process_msg(msg_id, sequence, compressed_reader, mtproto_request)
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# endregion
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def updates_thread_method(self):
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"""This method will run until specified and listen for incoming updates"""
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while self.updates_thread_running:
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with self.lock:
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try:
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self.updates_thread_receiving = True
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seq, body = self.transport.receive()
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message, remote_msg_id, remote_sequence = self.decode_msg(body)
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with BinaryReader(message) as reader:
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self.process_msg(remote_msg_id, remote_sequence, reader, request=None, only_updates=True)
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except ReadCancelledError:
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pass
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self.updates_thread_receiving = False
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# If we are here, it is because the read was cancelled
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# Sleep a bit just to give enough time for the other thread
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# to acquire the lock. No need to sleep if we're not running anymore
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if self.updates_thread_running:
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sleep(0.1)
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