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105 lines
4.3 KiB
Python
105 lines
4.3 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 MessageHandler class."""
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from typing import TYPE_CHECKING, Callable, Dict, Optional, TypeVar, Union
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from telegram import Update
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from telegram.ext import filters as filters_module, Handler
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from telegram._utils.defaultvalue import DefaultValue, DEFAULT_FALSE
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from telegram.ext._utils.types import CCT
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if TYPE_CHECKING:
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from telegram.ext import Dispatcher
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RT = TypeVar('RT')
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class MessageHandler(Handler[Update, CCT]):
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"""Handler class to handle telegram messages. They might contain text, media or status updates.
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Warning:
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When setting :paramref:`run_async` to :obj:`True`, 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). This defaults to all message updates
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being: :attr:`telegram.Update.message`, :attr:`telegram.Update.edited_message`,
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:attr:`telegram.Update.channel_post` and :attr:`telegram.Update.edited_channel_post`.
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If you don't want or need any of those pass ``~filters.UpdateType.*`` in the filter
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argument.
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callback (:obj:`callable`): The callback function for this handler. Will be called when
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:attr:`check_update` has determined that an update should be processed by this handler.
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Callback signature: ``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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run_async (:obj:`bool`): Determines whether the callback will run asynchronously.
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Defaults to :obj:`False`.
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Raises:
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ValueError
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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 (:obj:`callable`): The callback function for this handler.
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run_async (:obj:`bool`): Determines whether the callback will run asynchronously.
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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: filters_module.BaseFilter,
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callback: Callable[[Update, CCT], RT],
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run_async: Union[bool, DefaultValue] = DEFAULT_FALSE,
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):
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super().__init__(callback, run_async=run_async)
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self.filters = filters if filters is not None else filters_module.ALL
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def check_update(self, update: object) -> Optional[Union[bool, Dict[str, list]]]:
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"""Determines whether an update should be passed to this handlers :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)
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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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dispatcher: 'Dispatcher',
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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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