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111 lines
4.7 KiB
Python
111 lines
4.7 KiB
Python
#!/usr/bin/env python
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#
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# A library that provides a Python interface to the Telegram Bot API
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# Copyright (C) 2015-2022
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# Leandro Toledo de Souza <devs@python-telegram-bot.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser Public License for more details.
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#
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# You should have received a copy of the GNU Lesser Public License
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# along with this program. If not, see [http://www.gnu.org/licenses/].
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"""This module contains the ChatMemberHandler class."""
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from typing import ClassVar, TypeVar
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from telegram import Update
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from telegram._utils.defaultvalue import DEFAULT_TRUE
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from telegram._utils.types import DVInput
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from telegram.ext._handler import BaseHandler
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from telegram.ext._utils.types import CCT, HandlerCallback
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RT = TypeVar("RT")
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class ChatMemberHandler(BaseHandler[Update, CCT]):
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"""BaseHandler class to handle Telegram updates that contain a chat member update.
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Warning:
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When setting :paramref:`block` to :obj:`False`, you cannot rely on adding custom
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attributes to :class:`telegram.ext.CallbackContext`. See its docs for more info.
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Examples:
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:any:`Chat Member Bot <examples.chatmemberbot>`
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.. versionadded:: 13.4
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Args:
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callback (:term:`coroutine function`): The callback function for this handler. Will be
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called when :meth:`check_update` has determined that an update should be processed by
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this handler. Callback signature::
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async def callback(update: Update, context: CallbackContext)
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The return value of the callback is usually ignored except for the special case of
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:class:`telegram.ext.ConversationHandler`.
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chat_member_types (:obj:`int`, optional): Pass one of :attr:`MY_CHAT_MEMBER`,
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:attr:`CHAT_MEMBER` or :attr:`ANY_CHAT_MEMBER` to specify if this handler should handle
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only updates with :attr:`telegram.Update.my_chat_member`,
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:attr:`telegram.Update.chat_member` or both. Defaults to :attr:`MY_CHAT_MEMBER`.
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block (:obj:`bool`, optional): Determines whether the return value of the callback should
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be awaited before processing the next handler in
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:meth:`telegram.ext.Application.process_update`. Defaults to :obj:`True`.
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.. seealso:: `Concurrency <https://github.com/\
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python-telegram-bot/python-telegram-bot/wiki/Concurrency>`_
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Attributes:
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callback (:term:`coroutine function`): The callback function for this handler.
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chat_member_types (:obj:`int`): Optional. Specifies if this handler should handle
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only updates with :attr:`telegram.Update.my_chat_member`,
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:attr:`telegram.Update.chat_member` or both.
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block (:obj:`bool`): Determines whether the return value of the callback should be
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awaited before processing the next handler in
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:meth:`telegram.ext.Application.process_update`.
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"""
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__slots__ = ("chat_member_types",)
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MY_CHAT_MEMBER: ClassVar[int] = -1
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""":obj:`int`: Used as a constant to handle only :attr:`telegram.Update.my_chat_member`."""
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CHAT_MEMBER: ClassVar[int] = 0
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""":obj:`int`: Used as a constant to handle only :attr:`telegram.Update.chat_member`."""
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ANY_CHAT_MEMBER: ClassVar[int] = 1
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""":obj:`int`: Used as a constant to handle both :attr:`telegram.Update.my_chat_member`
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and :attr:`telegram.Update.chat_member`."""
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def __init__(
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self,
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callback: HandlerCallback[Update, CCT, RT],
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chat_member_types: int = MY_CHAT_MEMBER,
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block: DVInput[bool] = DEFAULT_TRUE,
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):
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super().__init__(callback, block=block)
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self.chat_member_types = chat_member_types
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def check_update(self, update: object) -> bool:
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"""Determines whether an update should be passed to this handler's :attr:`callback`.
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Args:
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update (:class:`telegram.Update` | :obj:`object`): Incoming update.
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Returns:
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:obj:`bool`
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"""
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if isinstance(update, Update):
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if not (update.my_chat_member or update.chat_member):
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return False
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if self.chat_member_types == self.ANY_CHAT_MEMBER:
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return True
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if self.chat_member_types == self.CHAT_MEMBER:
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return bool(update.chat_member)
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return bool(update.my_chat_member)
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return False
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