mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-09-21 19:28:54 +03:00
790 lines
30 KiB
Python
790 lines
30 KiB
Python
import logging
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import os
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import threading
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from datetime import timedelta, datetime
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from hashlib import md5
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from io import BytesIO
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from threading import Lock
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from time import sleep
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from . import helpers as utils
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from .crypto import rsa, CdnDecrypter
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from .errors import (
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RPCError, BrokenAuthKeyError,
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FloodWaitError, FileMigrateError, TypeNotFoundError,
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UnauthorizedError, PhoneMigrateError, NetworkMigrateError, UserMigrateError
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)
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from .network import authenticator, MtProtoSender, Connection, ConnectionMode
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from .tl import TLObject, Session
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from .tl.all_tlobjects import LAYER
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from .tl.functions import (
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InitConnectionRequest, InvokeWithLayerRequest, PingRequest
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)
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from .tl.functions.auth import (
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ImportAuthorizationRequest, ExportAuthorizationRequest
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)
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from .tl.functions.help import (
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GetCdnConfigRequest, GetConfigRequest
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)
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from .tl.functions.updates import GetStateRequest
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from .tl.functions.upload import (
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GetFileRequest, SaveBigFilePartRequest, SaveFilePartRequest
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)
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from .tl.types import InputFile, InputFileBig
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from .tl.types.upload import FileCdnRedirect
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from .update_state import UpdateState
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from .utils import get_appropriated_part_size
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class TelegramBareClient:
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"""Bare Telegram Client with just the minimum -
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The reason to distinguish between a MtProtoSender and a
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TelegramClient itself is because the sender is just that,
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a sender, which should know nothing about Telegram but
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rather how to handle this specific connection.
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The TelegramClient itself should know how to initialize
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a proper connection to the servers, as well as other basic
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methods such as disconnection and reconnection.
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This distinction between a bare client and a full client
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makes it possible to create clones of the bare version
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(by using the same session, IP address and port) to be
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able to execute queries on either, without the additional
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cost that would involve having the methods for signing in,
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logging out, and such.
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"""
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# Current TelegramClient version
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__version__ = '0.14.2'
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# TODO Make this thread-safe, all connections share the same DC
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_dc_options = None
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# region Initialization
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def __init__(self, session, api_id, api_hash,
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connection_mode=ConnectionMode.TCP_FULL,
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proxy=None,
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update_workers=None,
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spawn_read_thread=False,
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timeout=timedelta(seconds=5),
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**kwargs):
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"""Refer to TelegramClient.__init__ for docs on this method"""
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if not api_id or not api_hash:
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raise PermissionError(
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"Your API ID or Hash cannot be empty or None. "
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"Refer to Telethon's README.rst for more information.")
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# Determine what session object we have
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if isinstance(session, str) or session is None:
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session = Session.try_load_or_create_new(session)
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elif not isinstance(session, Session):
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raise ValueError(
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'The given session must be a str or a Session instance.'
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)
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self.session = session
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self.api_id = int(api_id)
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self.api_hash = api_hash
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if self.api_id < 20: # official apps must use obfuscated
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connection_mode = ConnectionMode.TCP_OBFUSCATED
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# This is the main sender, which will be used from the thread
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# that calls .connect(). Every other thread will spawn a new
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# temporary connection. The connection on this one is always
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# kept open so Telegram can send us updates.
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self._sender = MtProtoSender(self.session, Connection(
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self.session.server_address, self.session.port,
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mode=connection_mode, proxy=proxy, timeout=timeout
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))
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self._logger = logging.getLogger(__name__)
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# Two threads may be calling reconnect() when the connection is lost,
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# we only want one to actually perform the reconnection.
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self._reconnect_lock = Lock()
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# Cache "exported" sessions as 'dc_id: Session' not to recreate
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# them all the time since generating a new key is a relatively
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# expensive operation.
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self._exported_sessions = {}
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# This member will process updates if enabled.
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# One may change self.updates.enabled at any later point.
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self.updates = UpdateState(workers=update_workers)
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# Used on connection - the user may modify these and reconnect
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kwargs['app_version'] = kwargs.get('app_version', self.__version__)
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for name, value in kwargs.items():
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if hasattr(self.session, name):
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setattr(self.session, name, value)
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# Despite the state of the real connection, keep track of whether
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# the user has explicitly called .connect() or .disconnect() here.
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# This information is required by the read thread, who will be the
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# one attempting to reconnect on the background *while* the user
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# doesn't explicitly call .disconnect(), thus telling it to stop
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# retrying. The main thread, knowing there is a background thread
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# attempting reconnection as soon as it happens, will just sleep.
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self._user_connected = False
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# Save whether the user is authorized here (a.k.a. logged in)
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self._authorized = False
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# Uploaded files cache so subsequent calls are instant
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self._upload_cache = {}
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# Constantly read for results and updates from within the main client,
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# if the user has left enabled such option.
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self._spawn_read_thread = spawn_read_thread
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self._recv_thread = None
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# Identifier of the main thread (the one that called .connect()).
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# This will be used to create new connections from any other thread,
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# so that requests can be sent in parallel.
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self._main_thread_ident = None
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# Default PingRequest delay
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self._last_ping = datetime.now()
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self._ping_delay = timedelta(minutes=1)
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# endregion
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# region Connecting
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def connect(self, _exported_auth=None, _sync_updates=True, _cdn=False):
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"""Connects to the Telegram servers, executing authentication if
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required. Note that authenticating to the Telegram servers is
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not the same as authenticating the desired user itself, which
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may require a call (or several) to 'sign_in' for the first time.
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Note that the optional parameters are meant for internal use.
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If '_exported_auth' is not None, it will be used instead to
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determine the authorization key for the current session.
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If '_sync_updates', sync_updates() will be called and a
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second thread will be started if necessary. Note that this
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will FAIL if the client is not connected to the user's
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native data center, raising a "UserMigrateError", and
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calling .disconnect() in the process.
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If '_cdn' is False, methods that are not allowed on such data
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centers won't be invoked.
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"""
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self._main_thread_ident = threading.get_ident()
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try:
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self._sender.connect()
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if not self.session.auth_key:
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# New key, we need to tell the server we're going to use
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# the latest layer
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try:
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self.session.auth_key, self.session.time_offset = \
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authenticator.do_authentication(self._sender.connection)
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except BrokenAuthKeyError:
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return False
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self.session.layer = LAYER
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self.session.save()
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init_connection = True
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else:
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init_connection = self.session.layer != LAYER
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if init_connection:
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if _exported_auth is not None:
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self._init_connection(ImportAuthorizationRequest(
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_exported_auth.id, _exported_auth.bytes
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))
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elif not _cdn:
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TelegramBareClient._dc_options = \
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self._init_connection(GetConfigRequest()).dc_options
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elif _exported_auth is not None:
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self(ImportAuthorizationRequest(
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_exported_auth.id, _exported_auth.bytes
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))
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if TelegramBareClient._dc_options is None and not _cdn:
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TelegramBareClient._dc_options = \
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self(GetConfigRequest()).dc_options
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# Connection was successful! Try syncing the update state
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# UNLESS '_sync_updates' is False (we probably are in
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# another data center and this would raise UserMigrateError)
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# to also assert whether the user is logged in or not.
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self._user_connected = True
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if _sync_updates and not _cdn:
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try:
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self.sync_updates()
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self._set_connected_and_authorized()
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except UnauthorizedError:
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self._authorized = False
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return True
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except TypeNotFoundError as e:
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# This is fine, probably layer migration
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self._logger.debug('Found invalid item, probably migrating', e)
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self.disconnect()
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return self.connect(
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_exported_auth=_exported_auth,
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_sync_updates=_sync_updates,
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_cdn=_cdn
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)
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except (RPCError, ConnectionError) as error:
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# Probably errors from the previous session, ignore them
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self.disconnect()
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self._logger.debug(
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'Could not stabilise initial connection: {}'.format(error)
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)
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return False
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def is_connected(self):
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return self._sender.is_connected()
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def _init_connection(self, query=None):
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result = self(InvokeWithLayerRequest(LAYER, InitConnectionRequest(
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api_id=self.api_id,
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device_model=self.session.device_model,
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system_version=self.session.system_version,
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app_version=self.session.app_version,
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lang_code=self.session.lang_code,
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system_lang_code=self.session.system_lang_code,
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lang_pack='', # "langPacks are for official apps only"
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query=query
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)))
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self.session.layer = LAYER
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self.session.save()
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return result
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def disconnect(self):
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"""Disconnects from the Telegram server
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and stops all the spawned threads"""
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self._user_connected = False
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self._recv_thread = None
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# This will trigger a "ConnectionResetError", for subsequent calls
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# to read or send (from another thread) and usually, the background
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# thread would try restarting the connection but since the
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# ._recv_thread = None, it knows it doesn't have to.
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self._sender.disconnect()
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# TODO Shall we clear the _exported_sessions, or may be reused?
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pass
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def _reconnect(self, new_dc=None):
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"""If 'new_dc' is not set, only a call to .connect() will be made
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since it's assumed that the connection has been lost and the
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library is reconnecting.
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If 'new_dc' is set, the client is first disconnected from the
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current data center, clears the auth key for the old DC, and
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connects to the new data center.
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"""
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if new_dc is None:
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# Assume we are disconnected due to some error, so connect again
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with self._reconnect_lock:
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# Another thread may have connected again, so check that first
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if not self.is_connected():
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return self.connect()
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else:
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return True
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else:
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self.disconnect()
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self.session.auth_key = None # Force creating new auth_key
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dc = self._get_dc(new_dc)
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ip = dc.ip_address
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self._sender.connection.ip = self.session.server_address = ip
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self._sender.connection.port = self.session.port = dc.port
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self.session.save()
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return self.connect()
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# endregion
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# region Working with different connections/Data Centers
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def _on_read_thread(self):
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return self._recv_thread is not None and \
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threading.get_ident() == self._recv_thread.ident
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def _get_dc(self, dc_id, ipv6=False, cdn=False):
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"""Gets the Data Center (DC) associated to 'dc_id'"""
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if TelegramBareClient._dc_options is None:
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raise ConnectionError(
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'Cannot determine the required data center IP address. '
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'Stabilise a successful initial connection first.')
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try:
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if cdn:
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# Ensure we have the latest keys for the CDNs
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for pk in self(GetCdnConfigRequest()).public_keys:
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rsa.add_key(pk.public_key)
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return next(
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dc for dc in TelegramBareClient._dc_options if dc.id == dc_id
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and bool(dc.ipv6) == ipv6 and bool(dc.cdn) == cdn
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)
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except StopIteration:
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if not cdn:
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raise
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# New configuration, perhaps a new CDN was added?
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TelegramBareClient._dc_options = self(GetConfigRequest()).dc_options
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return self._get_dc(dc_id, ipv6=ipv6, cdn=cdn)
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def _get_exported_client(self, dc_id):
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"""Creates and connects a new TelegramBareClient for the desired DC.
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If it's the first time calling the method with a given dc_id,
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a new session will be first created, and its auth key generated.
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Exporting/Importing the authorization will also be done so that
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the auth is bound with the key.
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"""
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# Thanks badoualy/kotlogram on /telegram/api/DefaultTelegramClient.kt
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# for clearly showing how to export the authorization! ^^
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session = self._exported_sessions.get(dc_id)
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if session:
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export_auth = None # Already bound with the auth key
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else:
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# TODO Add a lock, don't allow two threads to create an auth key
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# (when calling .connect() if there wasn't a previous session).
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# for the same data center.
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dc = self._get_dc(dc_id)
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# Export the current authorization to the new DC.
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export_auth = self(ExportAuthorizationRequest(dc_id))
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# Create a temporary session for this IP address, which needs
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# to be different because each auth_key is unique per DC.
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#
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# Construct this session with the connection parameters
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# (system version, device model...) from the current one.
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session = Session(self.session)
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session.server_address = dc.ip_address
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session.port = dc.port
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self._exported_sessions[dc_id] = session
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client = TelegramBareClient(
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session, self.api_id, self.api_hash,
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proxy=self._sender.connection.conn.proxy,
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timeout=self._sender.connection.get_timeout()
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)
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client.connect(_exported_auth=export_auth, _sync_updates=False)
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client._authorized = True # We exported the auth, so we got auth
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return client
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def _get_cdn_client(self, cdn_redirect):
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"""Similar to ._get_exported_client, but for CDNs"""
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session = self._exported_sessions.get(cdn_redirect.dc_id)
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if not session:
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dc = self._get_dc(cdn_redirect.dc_id, cdn=True)
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session = Session(self.session)
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session.server_address = dc.ip_address
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session.port = dc.port
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self._exported_sessions[cdn_redirect.dc_id] = session
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client = TelegramBareClient(
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session, self.api_id, self.api_hash,
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proxy=self._sender.connection.conn.proxy,
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timeout=self._sender.connection.get_timeout()
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)
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# This will make use of the new RSA keys for this specific CDN.
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#
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# This relies on the fact that TelegramBareClient._dc_options is
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# static and it won't be called from this DC (it would fail).
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client.connect(_cdn=True) # Avoid invoking non-CDN specific methods
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client._authorized = self._authorized
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return client
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# endregion
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# region Invoking Telegram requests
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def invoke(self, *requests, retries=5):
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"""Invokes (sends) a MTProtoRequest and returns (receives) its result.
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The invoke will be retried up to 'retries' times before raising
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ValueError().
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"""
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if not all(isinstance(x, TLObject) and
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x.content_related for x in requests):
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raise ValueError('You can only invoke requests, not types!')
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# Determine the sender to be used (main or a new connection)
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on_main_thread = threading.get_ident() == self._main_thread_ident
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if on_main_thread or self._on_read_thread():
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sender = self._sender
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else:
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sender = self._sender.clone()
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sender.connect()
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# We should call receive from this thread if there's no background
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# thread reading or if the server disconnected us and we're trying
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# to reconnect. This is because the read thread may either be
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# locked also trying to reconnect or we may be said thread already.
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call_receive = not on_main_thread or self._recv_thread is None \
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or self._reconnect_lock.locked()
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try:
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for _ in range(retries):
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result = self._invoke(sender, call_receive, *requests)
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if result:
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return result
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raise ValueError('Number of retries reached 0.')
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finally:
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if sender != self._sender:
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sender.disconnect() # Close temporary connections
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def _invoke(self, sender, call_receive, *requests):
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try:
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# Ensure that we start with no previous errors (i.e. resending)
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for x in requests:
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x.confirm_received.clear()
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x.rpc_error = None
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sender.send(*requests)
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if not call_receive:
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# TODO This will be slightly troublesome if we allow
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# switching between constant read or not on the fly.
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# Must also watch out for calling .read() from two places,
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# in which case a Lock would be required for .receive().
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for x in requests:
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x.confirm_received.wait(
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sender.connection.get_timeout()
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)
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else:
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while not all(x.confirm_received.is_set() for x in requests):
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sender.receive(update_state=self.updates)
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except (PhoneMigrateError, NetworkMigrateError,
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UserMigrateError) as e:
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self._logger.debug(
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'DC error when invoking request, '
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'attempting to reconnect at DC {}'.format(e.new_dc)
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)
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# TODO What happens with the background thread here?
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# For normal use cases, this won't happen, because this will only
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# be on the very first connection (not authorized, not running),
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# but may be an issue for people who actually travel?
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self._reconnect(new_dc=e.new_dc)
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return self._invoke(sender, call_receive, *requests)
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except TimeoutError:
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pass # We will just retry
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except ConnectionResetError:
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if not self._authorized or self._reconnect_lock.locked():
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# Only attempt reconnecting if we're authorized and not
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# reconnecting already.
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raise
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self._logger.debug('Server disconnected us. Reconnecting and '
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'resending request...')
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if sender != self._sender:
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# TODO Try reconnecting forever too?
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sender.connect()
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else:
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while self._user_connected and not self._reconnect():
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sleep(0.1) # Retry forever until we can send the request
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except FloodWaitError:
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sender.disconnect()
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self.disconnect()
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raise
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finally:
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if sender != self._sender:
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sender.disconnect()
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try:
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raise next(x.rpc_error for x in requests if x.rpc_error)
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except StopIteration:
|
|
if any(x.result is None for x in requests):
|
|
# "A container may only be accepted or
|
|
# rejected by the other party as a whole."
|
|
return None
|
|
elif len(requests) == 1:
|
|
return requests[0].result
|
|
else:
|
|
return [x.result for x in requests]
|
|
|
|
# Let people use client(SomeRequest()) instead client.invoke(...)
|
|
__call__ = invoke
|
|
|
|
# Some really basic functionality
|
|
|
|
def is_user_authorized(self):
|
|
"""Has the user been authorized yet
|
|
(code request sent and confirmed)?"""
|
|
return self._authorized
|
|
|
|
# endregion
|
|
|
|
# region Uploading media
|
|
|
|
def upload_file(self,
|
|
file,
|
|
part_size_kb=None,
|
|
file_name=None,
|
|
progress_callback=None):
|
|
"""Uploads the specified file and returns a handle (an instance
|
|
of InputFile or InputFileBig, as required) which can be later used.
|
|
|
|
Uploading a file will simply return a "handle" to the file stored
|
|
remotely in the Telegram servers, which can be later used on. This
|
|
will NOT upload the file to your own chat.
|
|
|
|
'file' may be either a file path, a byte array, or a stream.
|
|
Note that if the file is a stream it will need to be read
|
|
entirely into memory to tell its size first.
|
|
|
|
If 'progress_callback' is not None, it should be a function that
|
|
takes two parameters, (bytes_uploaded, total_bytes).
|
|
|
|
Default values for the optional parameters if left as None are:
|
|
part_size_kb = get_appropriated_part_size(file_size)
|
|
file_name = os.path.basename(file_path)
|
|
"""
|
|
if isinstance(file, str):
|
|
file_size = os.path.getsize(file)
|
|
elif isinstance(file, bytes):
|
|
file_size = len(file)
|
|
else:
|
|
file = file.read()
|
|
file_size = len(file)
|
|
|
|
if not part_size_kb:
|
|
part_size_kb = get_appropriated_part_size(file_size)
|
|
|
|
if part_size_kb > 512:
|
|
raise ValueError('The part size must be less or equal to 512KB')
|
|
|
|
part_size = int(part_size_kb * 1024)
|
|
if part_size % 1024 != 0:
|
|
raise ValueError('The part size must be evenly divisible by 1024')
|
|
|
|
# Determine whether the file is too big (over 10MB) or not
|
|
# Telegram does make a distinction between smaller or larger files
|
|
is_large = file_size > 10 * 1024 * 1024
|
|
part_count = (file_size + part_size - 1) // part_size
|
|
|
|
file_id = utils.generate_random_long()
|
|
hash_md5 = md5()
|
|
|
|
stream = open(file, 'rb') if isinstance(file, str) else BytesIO(file)
|
|
try:
|
|
for part_index in range(part_count):
|
|
# Read the file by in chunks of size part_size
|
|
part = stream.read(part_size)
|
|
|
|
# The SavePartRequest is different depending on whether
|
|
# the file is too large or not (over or less than 10MB)
|
|
if is_large:
|
|
request = SaveBigFilePartRequest(file_id, part_index,
|
|
part_count, part)
|
|
else:
|
|
request = SaveFilePartRequest(file_id, part_index, part)
|
|
|
|
result = self(request)
|
|
if result:
|
|
if not is_large:
|
|
# No need to update the hash if it's a large file
|
|
hash_md5.update(part)
|
|
|
|
if progress_callback:
|
|
progress_callback(stream.tell(), file_size)
|
|
else:
|
|
raise ValueError('Failed to upload file part {}.'
|
|
.format(part_index))
|
|
finally:
|
|
stream.close()
|
|
|
|
# Set a default file name if None was specified
|
|
if not file_name:
|
|
if isinstance(file, str):
|
|
file_name = os.path.basename(file)
|
|
else:
|
|
file_name = str(file_id)
|
|
|
|
if is_large:
|
|
return InputFileBig(file_id, part_count, file_name)
|
|
else:
|
|
return InputFile(file_id, part_count, file_name,
|
|
md5_checksum=hash_md5.hexdigest())
|
|
|
|
# endregion
|
|
|
|
# region Downloading media
|
|
|
|
def download_file(self,
|
|
input_location,
|
|
file,
|
|
part_size_kb=None,
|
|
file_size=None,
|
|
progress_callback=None):
|
|
"""Downloads the given InputFileLocation to file (a stream or str).
|
|
|
|
If 'progress_callback' is not None, it should be a function that
|
|
takes two parameters, (bytes_downloaded, total_bytes). Note that
|
|
'total_bytes' simply equals 'file_size', and may be None.
|
|
"""
|
|
if not part_size_kb:
|
|
if not file_size:
|
|
part_size_kb = 64 # Reasonable default
|
|
else:
|
|
part_size_kb = get_appropriated_part_size(file_size)
|
|
|
|
part_size = int(part_size_kb * 1024)
|
|
# https://core.telegram.org/api/files says:
|
|
# > part_size % 1024 = 0 (divisible by 1KB)
|
|
#
|
|
# But https://core.telegram.org/cdn (more recent) says:
|
|
# > limit must be divisible by 4096 bytes
|
|
# So we just stick to the 4096 limit.
|
|
if part_size % 4096 != 0:
|
|
raise ValueError('The part size must be evenly divisible by 4096.')
|
|
|
|
if isinstance(file, str):
|
|
# Ensure that we'll be able to download the media
|
|
utils.ensure_parent_dir_exists(file)
|
|
f = open(file, 'wb')
|
|
else:
|
|
f = file
|
|
|
|
# The used client will change if FileMigrateError occurs
|
|
client = self
|
|
cdn_decrypter = None
|
|
|
|
try:
|
|
offset_index = 0
|
|
while True:
|
|
offset = offset_index * part_size
|
|
|
|
try:
|
|
if cdn_decrypter:
|
|
result = cdn_decrypter.get_file()
|
|
else:
|
|
result = client(GetFileRequest(
|
|
input_location, offset, part_size
|
|
))
|
|
|
|
if isinstance(result, FileCdnRedirect):
|
|
cdn_decrypter, result = \
|
|
CdnDecrypter.prepare_decrypter(
|
|
client, self._get_cdn_client(result), result
|
|
)
|
|
|
|
except FileMigrateError as e:
|
|
client = self._get_exported_client(e.new_dc)
|
|
continue
|
|
|
|
offset_index += 1
|
|
|
|
# If we have received no data (0 bytes), the file is over
|
|
# So there is nothing left to download and write
|
|
if not result.bytes:
|
|
# Return some extra information, unless it's a CDN file
|
|
return getattr(result, 'type', '')
|
|
|
|
f.write(result.bytes)
|
|
if progress_callback:
|
|
progress_callback(f.tell(), file_size)
|
|
finally:
|
|
if client != self:
|
|
client.disconnect()
|
|
|
|
if cdn_decrypter:
|
|
try:
|
|
cdn_decrypter.client.disconnect()
|
|
except:
|
|
pass
|
|
if isinstance(file, str):
|
|
f.close()
|
|
|
|
# endregion
|
|
|
|
# region Updates handling
|
|
|
|
def sync_updates(self):
|
|
"""Synchronizes self.updates to their initial state. Will be
|
|
called automatically on connection if self.updates.enabled = True,
|
|
otherwise it should be called manually after enabling updates.
|
|
"""
|
|
self.updates.process(self(GetStateRequest()))
|
|
|
|
def add_update_handler(self, handler):
|
|
"""Adds an update handler (a function which takes a TLObject,
|
|
an update, as its parameter) and listens for updates"""
|
|
sync = not self.updates.handlers
|
|
self.updates.handlers.append(handler)
|
|
if sync:
|
|
self.sync_updates()
|
|
|
|
def remove_update_handler(self, handler):
|
|
self.updates.handlers.remove(handler)
|
|
|
|
def list_update_handlers(self):
|
|
return self.updates.handlers[:]
|
|
|
|
# endregion
|
|
|
|
# Constant read
|
|
|
|
def _set_connected_and_authorized(self):
|
|
self._authorized = True
|
|
if self._spawn_read_thread and self._recv_thread is None:
|
|
self._recv_thread = threading.Thread(
|
|
name='ReadThread', daemon=True,
|
|
target=self._recv_thread_impl
|
|
)
|
|
self._recv_thread.start()
|
|
|
|
# By using this approach, another thread will be
|
|
# created and started upon connection to constantly read
|
|
# from the other end. Otherwise, manual calls to .receive()
|
|
# must be performed. The MtProtoSender cannot be connected,
|
|
# or an error will be thrown.
|
|
#
|
|
# This way, sending and receiving will be completely independent.
|
|
def _recv_thread_impl(self):
|
|
while self._user_connected:
|
|
try:
|
|
if datetime.now() > self._last_ping + self._ping_delay:
|
|
self._sender.send(PingRequest(
|
|
int.from_bytes(os.urandom(8), 'big', signed=True)
|
|
))
|
|
self._last_ping = datetime.now()
|
|
|
|
self._sender.receive(update_state=self.updates)
|
|
except TimeoutError:
|
|
# No problem.
|
|
pass
|
|
except ConnectionResetError:
|
|
self._logger.debug('Server disconnected us. Reconnecting...')
|
|
while self._user_connected and not self._reconnect():
|
|
sleep(0.1) # Retry forever, this is instant messaging
|
|
|
|
except Exception as error:
|
|
# Unknown exception, pass it to the main thread
|
|
self._logger.debug(
|
|
'[ERROR] Unknown error on the read thread, please report',
|
|
error
|
|
)
|
|
# If something strange happens we don't want to enter an
|
|
# infinite loop where all we do is raise an exception, so
|
|
# add a little sleep to avoid the CPU usage going mad.
|
|
sleep(0.1)
|
|
break
|
|
|
|
self._recv_thread = None
|
|
|
|
# endregion
|