mirror of
https://github.com/LonamiWebs/Telethon.git
synced 2024-11-11 03:56:36 +03:00
49555ad018
The old intersection method and allowing an arbitrary part size wasn't working properly. Assuming that Telegram will send a sha sum for the whole file, in the correct order, we can simply use their offsets to download the file.
518 lines
19 KiB
Python
518 lines
19 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 . 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, 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, 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.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 .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__ = '0.13.1'
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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, 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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self._connection_mode = connection_mode
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self.proxy = proxy
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self._timeout = timeout
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self._logger = logging.getLogger(__name__)
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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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# Update callbacks (functions accepting a single TLObject) go here
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#
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# Note that changing the list to which this variable points to
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# will not reflect the changes on the existing senders.
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self._update_callbacks = []
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# These will be set later
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self.dc_options = None
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self._sender = None
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# endregion
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# region Connecting
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def connect(self, exported_auth=None, initial_query=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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If 'initial_query' is not None, it will override the default
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'GetConfigRequest()', and its result will be returned ONLY
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if the client wasn't connected already.
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"""
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if self._sender and self._sender.is_connected():
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# Try sending a ping to make sure we're connected already
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# TODO Maybe there's a better way to check this
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try:
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if initial_query is None:
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self(PingRequest(utils.generate_random_long()))
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return True
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else:
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return self(initial_query)
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except:
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# If ping failed, ensure we're disconnected first
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self.disconnect()
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connection = Connection(
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self.session.server_address, self.session.port,
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mode=self._connection_mode, proxy=self.proxy, timeout=self._timeout
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)
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try:
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if not self.session.auth_key:
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self.session.auth_key, self.session.time_offset = \
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authenticator.do_authentication(connection)
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self.session.save()
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self._sender = MtProtoSender(connection, self.session)
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self._sender.unhandled_callbacks = self._update_callbacks
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self._sender.connect()
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# Now it's time to send an InitConnectionRequest
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# This must always be invoked with the layer we'll be using
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if exported_auth is None:
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query = initial_query if initial_query else GetConfigRequest()
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else:
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query = ImportAuthorizationRequest(
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exported_auth.id, exported_auth.bytes)
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request = 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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result = self(InvokeWithLayerRequest(
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layer=layer, query=request
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))
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if initial_query is None:
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if exported_auth is not None:
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result = self(GetConfigRequest())
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# We're only interested in the DC options,
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# although many other options are available!
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self.dc_options = result.dc_options
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return True
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else:
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return result
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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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initial_query=initial_query)
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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 None if initial_query else False
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def disconnect(self):
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"""Disconnects from the Telegram server"""
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if self._sender:
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self._sender.disconnect()
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self._sender = None
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def reconnect(self, new_dc=None):
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"""Disconnects and connects again (effectively reconnecting).
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If 'new_dc' is not None, the current authorization key is
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removed, the DC used is switched, and a new connection is made.
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"""
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self.disconnect()
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if new_dc is not None:
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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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self.session.server_address = dc.ip_address
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self.session.port = dc.port
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self.session.save()
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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 not self.dc_options:
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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 self.dc_options if dc.id == dc_id and
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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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self.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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timeout=self._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, updates=None, call_receive=True):
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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 not self._sender:
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raise ValueError('You must be connected to invoke 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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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() # TODO Socket's timeout here?
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else:
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while not request.confirm_received.is_set():
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self._sender.receive()
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if request.rpc_error:
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raise request.rpc_error
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return request.result
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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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return self.invoke(request)
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except FloodWaitError:
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self.disconnect()
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raise
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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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if cdn_decrypter:
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cdn_decrypter.finish_check()
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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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