mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-26 11:23:46 +03:00
532 lines
20 KiB
Python
532 lines
20 KiB
Python
import logging
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from datetime import timedelta
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from hashlib import md5
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from io import BytesIO
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from os import path
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from threading import Lock
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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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)
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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
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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.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__ = '0.13.5'
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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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process_updates=False,
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timeout=timedelta(seconds=5)):
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"""Initializes the Telegram client with the specified API ID and Hash.
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Session must always be a Session instance, and an optional proxy
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can also be specified to be used on the connection.
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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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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._connect_lock = Lock()
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# Cache "exported" senders 'dc_id: TelegramBareClient' and
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# their corresponding sessions not to recreate them all
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# the time since it's a (somewhat expensive) process.
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self._cached_clients = {}
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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(process_updates)
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# endregion
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# region Connecting
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def connect(self, exported_auth=None):
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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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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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"""
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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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else:
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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:
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TelegramBareClient._dc_options = \
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self(GetConfigRequest()).dc_options
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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(exported_auth=exported_auth)
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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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self._sender.disconnect()
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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._connect_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 Data Centers
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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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init_connection=False,
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bypass_cache=False):
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"""Gets a cached exported TelegramBareClient for the desired DC.
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If it's the first time retrieving the TelegramBareClient, the
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current authorization is exported to the new DC so that
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it can be used there, and the connection is initialized.
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If after using the sender a ConnectionResetError is raised,
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this method should be called again with init_connection=True
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in order to perform the reconnection.
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If bypass_cache is True, a new client will be exported and
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it will not be cached.
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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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client = self._cached_clients.get(dc_id)
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if client and not bypass_cache:
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if init_connection:
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client.reconnect()
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return client
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else:
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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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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)
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if not bypass_cache:
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# Don't go through this expensive process every time.
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self._cached_clients[dc_id] = client
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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, request, call_receive=True, retries=5):
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"""Invokes (sends) a MTProtoRequest and returns (receives) its result.
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If 'updates' is not None, all read update object will be put
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in such list. Otherwise, update objects will be ignored.
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If 'call_receive' is set to False, then there should be another
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thread calling to 'self._sender.receive()' running or this method
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will lock forever.
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"""
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if not isinstance(request, TLObject) and not request.content_related:
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raise ValueError('You can only invoke requests, not types!')
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if retries <= 0:
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raise ValueError('Number of retries reached 0.')
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try:
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# Ensure that we start with no previous errors (i.e. resending)
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request.confirm_received.clear()
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request.rpc_error = None
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self._sender.send(request)
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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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request.confirm_received.wait(
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self._sender.connection.get_timeout()
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)
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else:
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while not request.confirm_received.is_set():
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self._sender.receive(update_state=self.updates)
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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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self._logger.debug('Server disconnected us. Reconnecting and '
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'resending request...')
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self._reconnect()
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except FloodWaitError:
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self.disconnect()
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raise
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if request.rpc_error:
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raise request.rpc_error
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if request.result is None:
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return self.invoke(
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request, call_receive=call_receive, retries=(retries - 1)
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)
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else:
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return request.result
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# Let people use client(SomeRequest()) instead client.invoke(...)
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__call__ = invoke
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# endregion
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# region Uploading media
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def upload_file(self,
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file,
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part_size_kb=None,
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file_name=None,
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progress_callback=None):
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"""Uploads the specified file and returns a handle (an instance
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of InputFile or InputFileBig, as required) which can be later used.
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Uploading a file will simply return a "handle" to the file stored
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remotely in the Telegram servers, which can be later used on. This
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will NOT upload the file to your own chat.
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'file' may be either a file path, a byte array, or a stream.
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Note that if the file is a stream it will need to be read
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entirely into memory to tell its size first.
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If 'progress_callback' is not None, it should be a function that
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takes two parameters, (bytes_uploaded, total_bytes).
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Default values for the optional parameters if left as None are:
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part_size_kb = get_appropriated_part_size(file_size)
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file_name = path.basename(file_path)
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"""
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if isinstance(file, str):
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file_size = path.getsize(file)
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elif isinstance(file, bytes):
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file_size = len(file)
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else:
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file = file.read()
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file_size = len(file)
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if not part_size_kb:
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part_size_kb = get_appropriated_part_size(file_size)
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if part_size_kb > 512:
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raise ValueError('The part size must be less or equal to 512KB')
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part_size = int(part_size_kb * 1024)
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if part_size % 1024 != 0:
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raise ValueError('The part size must be evenly divisible by 1024')
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# Determine whether the file is too big (over 10MB) or not
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# Telegram does make a distinction between smaller or larger files
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is_large = file_size > 10 * 1024 * 1024
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part_count = (file_size + part_size - 1) // part_size
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file_id = utils.generate_random_long()
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hash_md5 = md5()
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stream = open(file, 'rb') if isinstance(file, str) else BytesIO(file)
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try:
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for part_index in range(part_count):
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# Read the file by in chunks of size part_size
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part = stream.read(part_size)
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# The SavePartRequest is different depending on whether
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# the file is too large or not (over or less than 10MB)
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if is_large:
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request = SaveBigFilePartRequest(file_id, part_index,
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part_count, part)
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else:
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request = SaveFilePartRequest(file_id, part_index, part)
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result = self(request)
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if result:
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if not is_large:
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# No need to update the hash if it's a large file
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hash_md5.update(part)
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if progress_callback:
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progress_callback(stream.tell(), file_size)
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else:
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raise ValueError('Failed to upload file part {}.'
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.format(part_index))
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finally:
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stream.close()
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# Set a default file name if None was specified
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if not file_name:
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if isinstance(file, str):
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file_name = path.basename(file)
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else:
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file_name = str(file_id)
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if is_large:
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return InputFileBig(file_id, part_count, file_name)
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else:
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return InputFile(file_id, part_count, file_name,
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md5_checksum=hash_md5.hexdigest())
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# endregion
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# region Downloading media
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def download_file(self,
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input_location,
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file,
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part_size_kb=None,
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file_size=None,
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progress_callback=None):
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"""Downloads the given InputFileLocation to file (a stream or str).
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If 'progress_callback' is not None, it should be a function that
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takes two parameters, (bytes_downloaded, total_bytes). Note that
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'total_bytes' simply equals 'file_size', and may be None.
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"""
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if not part_size_kb:
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if not file_size:
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part_size_kb = 64 # Reasonable default
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else:
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part_size_kb = get_appropriated_part_size(file_size)
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part_size = int(part_size_kb * 1024)
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# https://core.telegram.org/api/files says:
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# > part_size % 1024 = 0 (divisible by 1KB)
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#
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# But https://core.telegram.org/cdn (more recent) says:
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# > limit must be divisible by 4096 bytes
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# So we just stick to the 4096 limit.
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if part_size % 4096 != 0:
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raise ValueError('The part size must be evenly divisible by 4096.')
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if isinstance(file, str):
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# Ensure that we'll be able to download the media
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utils.ensure_parent_dir_exists(file)
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f = open(file, 'wb')
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else:
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f = file
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# The used client will change if FileMigrateError occurs
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client = self
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cdn_decrypter = None
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try:
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offset_index = 0
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while True:
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offset = offset_index * part_size
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try:
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if cdn_decrypter:
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result = cdn_decrypter.get_file()
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else:
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result = client(GetFileRequest(
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input_location, offset, part_size
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))
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if isinstance(result, FileCdnRedirect):
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cdn_decrypter, result = \
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CdnDecrypter.prepare_decrypter(
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client, TelegramBareClient, result
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)
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except FileMigrateError as e:
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client = self._get_exported_client(e.new_dc)
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continue
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offset_index += 1
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# If we have received no data (0 bytes), the file is over
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# So there is nothing left to download and write
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if not result.bytes:
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# Return some extra information, unless it's a CDN file
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return getattr(result, 'type', '')
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f.write(result.bytes)
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if progress_callback:
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progress_callback(f.tell(), file_size)
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finally:
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if cdn_decrypter:
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try:
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cdn_decrypter.client.disconnect()
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except:
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pass
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if isinstance(file, str):
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f.close()
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# endregion
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