mirror of
https://github.com/LonamiWebs/Telethon.git
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332 lines
13 KiB
Python
Executable File
332 lines
13 KiB
Python
Executable File
import gzip
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from telethon.errors import *
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from time import sleep
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from threading import Thread, Lock
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import telethon.helpers as utils
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from telethon.crypto import AES
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from telethon.utils import BinaryWriter, BinaryReader
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from telethon.tl.types import MsgsAck
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from telethon.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):
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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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self.updates_thread = Thread(target=self.updates_thread_method, name='Updates thread')
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self.updates_thread_running = False
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self.updates_thread_receiving = False
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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.set_listen_for_updates(enabled=False)
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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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first_handler = not self.on_update_handlers
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self.on_update_handlers.append(handler)
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# If this is the first added handler,
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# we must start the thread to receive updates
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if first_handler:
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self.set_listen_for_updates(enabled=True)
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def remove_update_handler(self, handler):
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self.on_update_handlers.remove(handler)
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# If there are no more update handlers, stop the thread
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if not self.on_update_handlers:
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self.set_listen_for_updates(False)
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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, resend=False):
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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 if we're not resending
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if not resend:
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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=None):
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"""Processes and handles a Telegram message"""
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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"
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if code == 0xf35c6d01: # rpc_result, (response of an RPC call, i.e., we sent a request)
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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, 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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if request is None:
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raise ValueError('Tried to handle a bad server salt with no request specified')
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# Resend
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self.send(request, resend=True)
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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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if not request:
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raise ValueError('RPC results should only happen after a request was sent')
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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 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, 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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return self.process_msg(msg_id, sequence, compressed_reader, request)
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# endregion
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def set_listen_for_updates(self, enabled):
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if enabled:
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if not self.updates_thread_running:
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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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else:
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self.updates_thread_running = False
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if self.updates_thread_receiving:
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self.transport.cancel_receive()
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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)
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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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