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# Pyrogram - Telegram MTProto API Client Library for Python

# This file is part of Pyrogram.

# Pyrogram is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# Pyrogram is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public License

# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.

from typing import Union

import pyrogram

from pyrogram import raw

from pyrogram import types

from pyrogram import utils

class GetChat:

async def get_chat(

self: "pyrogram.Client",

chat_id: Union[int, str]

) -> Union["types.Chat", "types.ChatPreview"]:

"""Get up to date information about a chat.

Information include current name of the user for one-on-one conversations, current username of a user, group or

channel, etc.

.. include:: /_includes/usable-by/users-bots.rst

Parameters:

chat_id (``int`` | ``str``):

Unique identifier (int) or username (str) of the target chat.

Unique identifier for the target chat in form of a *t.me/joinchat/* link, identifier (int) or username

of the target channel/supergroup (in the format @username).

Returns:

:obj:`~pyrogram.types.Chat` | :obj:`~pyrogram.types.ChatPreview`: On success, if you've already joined the chat, a chat object is returned,

otherwise, a chat preview object is returned.

Raises:

ValueError: In case the chat invite link points to a chat you haven't joined yet.

Example:

.. code-block:: python

chat = await app.get_chat("pyrogram")

print(chat)

"""

match = self.INVITE_LINK_RE.match(str(chat_id))

if match:

r = await self.invoke(

raw.functions.messages.CheckChatInvite(

hash=match.group(1)

)

if isinstance(r, raw.types.ChatInvite):

return types.ChatPreview._parse(self, r)

await self.fetch_peers([r.chat])

if isinstance(r.chat, raw.types.Chat):

chat_id = -r.chat.id

if isinstance(r.chat, raw.types.Channel):

chat_id = utils.get_channel_id(r.chat.id)

peer = await self.resolve_peer(chat_id)

if isinstance(peer, raw.types.InputPeerChannel):

r = await self.invoke(raw.functions.channels.GetFullChannel(channel=peer))

elif isinstance(peer, (raw.types.InputPeerUser, raw.types.InputPeerSelf)):

r = await self.invoke(raw.functions.users.GetFullUser(id=peer))

else:

r = await self.invoke(raw.functions.messages.GetFullChat(chat_id=peer.chat_id))

return await types.Chat._parse_full(self, r)

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