405 lines
12 KiB
Python
405 lines
12 KiB
Python
# Pyrogram - Telegram MTProto API Client Library for Python
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# Copyright (C) 2017-2018 Dan Tès <https://github.com/delivrance>
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#
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# This file is part of Pyrogram.
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#
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# Pyrogram is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Pyrogram is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.
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import logging
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import platform
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import threading
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from datetime import timedelta, datetime
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from hashlib import sha1, sha256
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from io import BytesIO
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from os import urandom
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from queue import Queue
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from threading import Event, Thread
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import pyrogram
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from pyrogram import __copyright__, __license__, __version__
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from pyrogram.api import functions, types, core
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from pyrogram.api.all import layer
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from pyrogram.api.core import Message, Object, MsgContainer, Long, FutureSalt, Int
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from pyrogram.api.errors import Error
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from pyrogram.connection import Connection
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from pyrogram.crypto import IGE, KDF
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from .internals import MsgId, MsgFactory, DataCenter
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log = logging.getLogger(__name__)
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class Result:
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def __init__(self):
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self.value = None
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self.event = Event()
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class Session:
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VERSION = __version__
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APP_VERSION = "Pyrogram \U0001f525 {}".format(VERSION)
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DEVICE_MODEL = "{} {}".format(
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platform.python_implementation(),
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platform.python_version()
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)
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SYSTEM_VERSION = "{} {}".format(
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platform.system(),
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platform.release()
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)
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INITIAL_SALT = 0x616e67656c696361
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WAIT_TIMEOUT = 10
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MAX_RETRIES = 5
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ACKS_THRESHOLD = 8
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PING_INTERVAL = 5
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notice_displayed = False
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def __init__(self,
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dc_id: int,
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test_mode: bool,
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proxy: type,
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auth_key: bytes,
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api_id: str,
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is_cdn: bool = False,
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net_workers: int = 2):
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if not Session.notice_displayed:
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print("Pyrogram v{}, {}".format(__version__, __copyright__))
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print("Licensed under the terms of the " + __license__, end="\n\n")
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Session.notice_displayed = True
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self.is_cdn = is_cdn
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self.net_workers = net_workers
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self.connection = Connection(DataCenter(dc_id, test_mode), proxy)
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self.api_id = api_id
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self.auth_key = auth_key
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self.auth_key_id = sha1(auth_key).digest()[-8:]
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self.msg_id = MsgId()
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self.session_id = Long(self.msg_id())
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self.msg_factory = MsgFactory(self.msg_id)
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self.current_salt = None
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self.pending_acks = set()
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self.recv_queue = Queue()
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self.results = {}
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self.ping_thread = None
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self.ping_thread_event = Event()
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self.next_salt_thread = None
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self.next_salt_thread_event = Event()
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self.is_connected = Event()
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self.client = None
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self.update_handler = None
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self.total_connections = 0
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self.total_messages = 0
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self.total_bytes = 0
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def start(self):
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terms = None
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while True:
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try:
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self.connection.connect()
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for i in range(self.net_workers):
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Thread(target=self.net_worker, name="NetWorker#{}".format(i + 1)).start()
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Thread(target=self.recv, name="RecvThread").start()
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self.current_salt = FutureSalt(0, 0, self.INITIAL_SALT)
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self.current_salt = FutureSalt(0, 0, self._send(functions.Ping(0)).new_server_salt)
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self.current_salt = self._send(functions.GetFutureSalts(1)).salts[0]
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self.next_salt_thread = Thread(target=self.next_salt, name="NextSaltThread")
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self.next_salt_thread.start()
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if not self.is_cdn:
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terms = self._send(
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functions.InvokeWithLayer(
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layer,
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functions.InitConnection(
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self.api_id,
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self.DEVICE_MODEL,
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self.SYSTEM_VERSION,
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self.APP_VERSION,
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"en", "", "en",
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functions.help.GetTermsOfService(),
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)
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)
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).text
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self.ping_thread = Thread(target=self.ping, name="PingThread")
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self.ping_thread.start()
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log.info("Connection inited: Layer {}".format(layer))
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except (OSError, TimeoutError):
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self.stop()
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else:
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break
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self.is_connected.set()
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self.total_connections += 1
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log.debug("Session started")
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return terms
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def stop(self):
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self.is_connected.clear()
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self.ping_thread_event.set()
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self.next_salt_thread_event.set()
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if self.ping_thread is not None:
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self.ping_thread.join()
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if self.next_salt_thread is not None:
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self.next_salt_thread.join()
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self.ping_thread_event.clear()
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self.next_salt_thread_event.clear()
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self.connection.close()
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for i in range(self.net_workers):
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self.recv_queue.put(None)
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log.debug("Session stopped")
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def restart(self):
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self.stop()
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self.start()
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def pack(self, message: Message):
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data = Long(self.current_salt.salt) + self.session_id + message.write()
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# MTProto 2.0 requires a minimum of 12 padding bytes.
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# I don't get why it says up to 1024 when what it actually needs after the
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# required 12 bytes is just extra 0..15 padding bytes for aes
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# TODO: It works, but recheck this. What's the meaning of 12..1024 padding bytes?
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padding = urandom(-(len(data) + 12) % 16 + 12)
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# 88 = 88 + 0 (outgoing message)
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msg_key_large = sha256(self.auth_key[88: 88 + 32] + data + padding).digest()
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msg_key = msg_key_large[8:24]
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aes_key, aes_iv = KDF(self.auth_key, msg_key, True)
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return self.auth_key_id + msg_key + IGE.encrypt(data + padding, aes_key, aes_iv)
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def unpack(self, b: BytesIO) -> Message:
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assert b.read(8) == self.auth_key_id, b.getvalue()
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msg_key = b.read(16)
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aes_key, aes_iv = KDF(self.auth_key, msg_key, False)
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data = BytesIO(IGE.decrypt(b.read(), aes_key, aes_iv))
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data.read(8)
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# https://core.telegram.org/mtproto/security_guidelines#checking-session-id
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assert data.read(8) == self.session_id
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message = Message.read(data)
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# https://core.telegram.org/mtproto/security_guidelines#checking-sha256-hash-value-of-msg-key
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# https://core.telegram.org/mtproto/security_guidelines#checking-message-length
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# 96 = 88 + 8 (incoming message)
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assert msg_key == sha256(self.auth_key[96:96 + 32] + data.getvalue()).digest()[8:24]
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# https://core.telegram.org/mtproto/security_guidelines#checking-msg-id
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# TODO: check for lower msg_ids
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assert message.msg_id % 2 != 0
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return message
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def net_worker(self):
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name = threading.current_thread().name
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log.debug("{} started".format(name))
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while True:
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packet = self.recv_queue.get()
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if packet is None:
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break
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try:
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self.unpack_dispatch_and_ack(packet)
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except Exception as e:
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log.error(e, exc_info=True)
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log.debug("{} stopped".format(name))
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def set_update_handler(self, client: pyrogram, update_handler: callable):
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self.client = client
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self.update_handler = update_handler
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def unpack_dispatch_and_ack(self, packet: bytes):
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data = self.unpack(BytesIO(packet))
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messages = (
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data.body.messages
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if isinstance(data.body, MsgContainer)
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else [data]
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)
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log.debug(data)
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for msg in messages:
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if msg.seq_no % 2 != 0:
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if msg.msg_id in self.pending_acks:
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continue
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else:
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self.pending_acks.add(msg.msg_id)
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if isinstance(msg.body, (types.MsgDetailedInfo, types.MsgNewDetailedInfo)):
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self.pending_acks.add(msg.body.answer_msg_id)
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continue
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if isinstance(msg.body, types.NewSessionCreated):
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continue
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msg_id = None
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if isinstance(msg.body, (types.BadMsgNotification, types.BadServerSalt)):
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msg_id = msg.body.bad_msg_id
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elif isinstance(msg.body, (core.FutureSalts, types.RpcResult)):
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msg_id = msg.body.req_msg_id
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elif isinstance(msg.body, types.Pong):
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msg_id = msg.body.msg_id
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else:
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if self.update_handler:
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self.update_handler(self.client, msg.body)
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if msg_id in self.results:
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self.results[msg_id].value = getattr(msg.body, "result", msg.body)
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self.results[msg_id].event.set()
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if len(self.pending_acks) >= self.ACKS_THRESHOLD:
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log.info("Send {} acks".format(len(self.pending_acks)))
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try:
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self._send(types.MsgsAck(list(self.pending_acks)), False)
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except (OSError, TimeoutError):
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pass
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else:
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self.pending_acks.clear()
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def ping(self):
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log.debug("PingThread started")
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while True:
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self.ping_thread_event.wait(self.PING_INTERVAL)
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if self.ping_thread_event.is_set():
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break
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try:
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self._send(functions.Ping(0), False)
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except (OSError, TimeoutError):
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pass
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log.debug("PingThread stopped")
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def next_salt(self):
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log.debug("NextSaltThread started")
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while True:
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now = datetime.now()
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# Seconds to wait until middle-overlap, which is
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# 15 minutes before/after the current/next salt end/start time
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dt = (self.current_salt.valid_until - now).total_seconds() - 900
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log.debug("Current salt: {} | Next salt in {:.0f}m {:.0f}s ({})".format(
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self.current_salt.salt,
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dt // 60,
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dt % 60,
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now + timedelta(seconds=dt)
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))
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self.next_salt_thread_event.wait(dt)
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if self.next_salt_thread_event.is_set():
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break
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try:
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self.current_salt = self._send(functions.GetFutureSalts(1)).salts[0]
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except (OSError, TimeoutError):
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self.connection.close()
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break
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log.debug("NextSaltThread stopped")
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def recv(self):
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log.debug("RecvThread started")
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while True:
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packet = self.connection.recv()
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if packet is None or (len(packet) == 4 and Int.read(BytesIO(packet)) == -404):
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if self.is_connected.is_set():
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Thread(target=self.restart, name="RestartThread").start()
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break
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self.recv_queue.put(packet)
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log.debug("RecvThread stopped")
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def _send(self, data: Object, wait_response: bool = True):
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message = self.msg_factory(data)
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msg_id = message.msg_id
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if wait_response:
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self.results[msg_id] = Result()
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payload = self.pack(message)
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try:
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self.connection.send(payload)
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except OSError as e:
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self.results.pop(msg_id, None)
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raise e
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if wait_response:
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self.results[msg_id].event.wait(self.WAIT_TIMEOUT)
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result = self.results.pop(msg_id).value
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if result is None:
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raise TimeoutError
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elif isinstance(result, types.RpcError):
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Error.raise_it(result, type(data))
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else:
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return result
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def send(self, data: Object):
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for i in range(self.MAX_RETRIES):
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self.is_connected.wait()
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try:
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return self._send(data)
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except (OSError, TimeoutError):
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log.warning("Retrying {}".format(type(data)))
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continue
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else:
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return None
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