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111 lines
4.6 KiB
Python
111 lines
4.6 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) 2015-2024
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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 MessageHandler class."""
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from typing import TYPE_CHECKING, Any, Dict, List, Optional, TypeVar, Union
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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 DVType
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from telegram.ext import filters as filters_module
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from telegram.ext._handlers.basehandler import BaseHandler
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from telegram.ext._utils.types import CCT, HandlerCallback
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if TYPE_CHECKING:
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from telegram.ext import Application
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RT = TypeVar("RT")
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class MessageHandler(BaseHandler[Update, CCT]):
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"""Handler class to handle Telegram messages. They might contain text, media or status
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updates.
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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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Args:
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filters (:class:`telegram.ext.filters.BaseFilter`): A filter inheriting from
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:class:`telegram.ext.filters.BaseFilter`. Standard filters can be found in
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:mod:`telegram.ext.filters`. Filters can be combined using bitwise
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operators (& for and, | for or, ~ for not). Passing :obj:`None` is a shortcut
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to passing :class:`telegram.ext.filters.ALL`.
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.. seealso:: :wiki:`Advanced Filters <Extensions---Advanced-Filters>`
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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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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:: :wiki:`Concurrency`
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Attributes:
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filters (:class:`telegram.ext.filters.BaseFilter`): Only allow updates with these Filters.
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See :mod:`telegram.ext.filters` for a full list of all available filters.
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callback (:term:`coroutine function`): The callback function for this handler.
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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__ = ("filters",)
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def __init__(
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self,
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filters: Optional[filters_module.BaseFilter],
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callback: HandlerCallback[Update, CCT, RT],
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block: DVType[bool] = DEFAULT_TRUE,
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):
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super().__init__(callback, block=block)
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self.filters: filters_module.BaseFilter = (
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filters if filters is not None else filters_module.ALL
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)
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def check_update(self, update: object) -> Optional[Union[bool, Dict[str, List[Any]]]]:
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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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return self.filters.check_update(update) or False
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return None
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def collect_additional_context(
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self,
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context: CCT,
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update: Update,
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application: "Application[Any, CCT, Any, Any, Any, Any]",
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check_result: Optional[Union[bool, Dict[str, object]]],
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) -> None:
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"""Adds possible output of data filters to the :class:`CallbackContext`."""
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if isinstance(check_result, dict):
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context.update(check_result)
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