python-telegram-bot/telegram/ext/callbackqueryhandler.py

#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2021
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 Public License for more details.
#
# You should have received a copy of the GNU Lesser Public License
# along with this program.  If not, see [http://www.gnu.org/licenses/].
"""This module contains the CallbackQueryHandler class."""

import re
from typing import (
    TYPE_CHECKING,
    Callable,
    Dict,
    Match,
    Optional,
    Pattern,
    TypeVar,
    Union,
    cast,
)

from telegram import Update
from telegram.utils.helpers import DefaultValue, DEFAULT_FALSE

from .handler import Handler
from .utils.types import CCT

if TYPE_CHECKING:
    from telegram.ext import Dispatcher

RT = TypeVar('RT')


class CallbackQueryHandler(Handler[Update, CCT]):
    """Handler class to handle Telegram callback queries. Optionally based on a regex.

    Read the documentation of the ``re`` module for more information.

    Note:
        * :attr:`pass_user_data` and :attr:`pass_chat_data` determine whether a ``dict`` you
          can use to keep any data in will be sent to the :attr:`callback` function. Related to
          either the user or the chat that the update was sent in. For each update from the same
          user or in the same chat, it will be the same ``dict``.

          Note that this is DEPRECATED, and you should use context based callbacks. See
          https://git.io/fxJuV for more info.
        * If your bot allows arbitrary objects as ``callback_data``, it may happen that the
          original ``callback_data`` for the incoming :class:`telegram.CallbackQuery`` can not be
          found. This is the case when either a malicious client tempered with the
          ``callback_data`` or the data was simply dropped from cache or not persisted. In these
          cases, an instance of :class:`telegram.ext.InvalidCallbackData` will be set as
          ``callback_data``.

          .. versionadded:: 13.6

    Warning:
        When setting ``run_async`` to :obj:`True`, you cannot rely on adding custom
        attributes to :class:`telegram.ext.CallbackContext`. See its docs for more info.

    Args:
        callback (:obj:`callable`): The callback function for this handler. Will be called when
            :attr:`check_update` has determined that an update should be processed by this handler.
            Callback signature for context based API:

                ``def callback(update: Update, context: CallbackContext)``

            The return value of the callback is usually ignored except for the special case of
            :class:`telegram.ext.ConversationHandler`.
        pass_update_queue (:obj:`bool`, optional): If set to :obj:`True`, a keyword argument called
            ``update_queue`` will be passed to the callback function. It will be the ``Queue``
            instance used by the :class:`telegram.ext.Updater` and :class:`telegram.ext.Dispatcher`
            that contains new updates which can be used to insert updates. Default is :obj:`False`.
            DEPRECATED: Please switch to context based callbacks.
        pass_job_queue (:obj:`bool`, optional): If set to :obj:`True`, a keyword argument called
            ``job_queue`` will be passed to the callback function. It will be a
            :class:`telegram.ext.JobQueue` instance created by the :class:`telegram.ext.Updater`
            which can be used to schedule new jobs. Default is :obj:`False`.
            DEPRECATED: Please switch to context based callbacks.
        pattern (:obj:`str` | `Pattern` | :obj:`callable` | :obj:`type`, optional):
            Pattern to test :attr:`telegram.CallbackQuery.data` against. If a string or a regex
            pattern is passed, :meth:`re.match` is used on :attr:`telegram.CallbackQuery.data` to
            determine if an update should be handled by this handler. If your bot allows arbitrary
            objects as ``callback_data``, non-strings will be accepted. To filter arbitrary
            objects you may pass

                * a callable, accepting exactly one argument, namely the
                  :attr:`telegram.CallbackQuery.data`. It must return :obj:`True` or
                  :obj:`False`/:obj:`None` to indicate, whether the update should be handled.
                * a :obj:`type`. If :attr:`telegram.CallbackQuery.data` is an instance of that type
                  (or a subclass), the update will be handled.

            If :attr:`telegram.CallbackQuery.data` is :obj:`None`, the
            :class:`telegram.CallbackQuery` update will not be handled.

            .. versionchanged:: 13.6
               Added support for arbitrary callback data.
        pass_groups (:obj:`bool`, optional): If the callback should be passed the result of
            ``re.match(pattern, data).groups()`` as a keyword argument called ``groups``.
            Default is :obj:`False`
            DEPRECATED: Please switch to context based callbacks.
        pass_groupdict (:obj:`bool`, optional): If the callback should be passed the result of
            ``re.match(pattern, data).groupdict()`` as a keyword argument called ``groupdict``.
            Default is :obj:`False`
            DEPRECATED: Please switch to context based callbacks.
        pass_user_data (:obj:`bool`, optional): If set to :obj:`True`, a keyword argument called
            ``user_data`` will be passed to the callback function. Default is :obj:`False`.
            DEPRECATED: Please switch to context based callbacks.
        pass_chat_data (:obj:`bool`, optional): If set to :obj:`True`, a keyword argument called
            ``chat_data`` will be passed to the callback function. Default is :obj:`False`.
            DEPRECATED: Please switch to context based callbacks.
        run_async (:obj:`bool`): Determines whether the callback will run asynchronously.
            Defaults to :obj:`False`.

    Attributes:
        callback (:obj:`callable`): The callback function for this handler.
        pass_update_queue (:obj:`bool`): Determines whether ``update_queue`` will be
            passed to the callback function.
        pass_job_queue (:obj:`bool`): Determines whether ``job_queue`` will be passed to
            the callback function.
        pattern (`Pattern` | :obj:`callable` | :obj:`type`): Optional. Regex pattern, callback or
            type to test :attr:`telegram.CallbackQuery.data` against.

            .. versionchanged:: 13.6
               Added support for arbitrary callback data.
        pass_groups (:obj:`bool`): Determines whether ``groups`` will be passed to the
            callback function.
        pass_groupdict (:obj:`bool`): Determines whether ``groupdict``. will be passed to
            the callback function.
        pass_user_data (:obj:`bool`): Determines whether ``user_data`` will be passed to
            the callback function.
        pass_chat_data (:obj:`bool`): Determines whether ``chat_data`` will be passed to
            the callback function.
        run_async (:obj:`bool`): Determines whether the callback will run asynchronously.

    """

    __slots__ = ('pattern', 'pass_groups', 'pass_groupdict')

    def __init__(
        self,
        callback: Callable[[Update, CCT], RT],
        pass_update_queue: bool = False,
        pass_job_queue: bool = False,
        pattern: Union[str, Pattern, type, Callable[[object], Optional[bool]]] = None,
        pass_groups: bool = False,
        pass_groupdict: bool = False,
        pass_user_data: bool = False,
        pass_chat_data: bool = False,
        run_async: Union[bool, DefaultValue] = DEFAULT_FALSE,
    ):
        super().__init__(
            callback,
            pass_update_queue=pass_update_queue,
            pass_job_queue=pass_job_queue,
            pass_user_data=pass_user_data,
            pass_chat_data=pass_chat_data,
            run_async=run_async,
        )

        if isinstance(pattern, str):
            pattern = re.compile(pattern)

        self.pattern = pattern
        self.pass_groups = pass_groups
        self.pass_groupdict = pass_groupdict

    def check_update(self, update: object) -> Optional[Union[bool, object]]:
        """Determines whether an update should be passed to this handlers :attr:`callback`.

        Args:
            update (:class:`telegram.Update` | :obj:`object`): Incoming update.

        Returns:
            :obj:`bool`

        """
        if isinstance(update, Update) and update.callback_query:
            callback_data = update.callback_query.data
            if self.pattern:
                if callback_data is None:
                    return False
                if isinstance(self.pattern, type):
                    return isinstance(callback_data, self.pattern)
                if callable(self.pattern):
                    return self.pattern(callback_data)
                match = re.match(self.pattern, callback_data)
                if match:
                    return match
            else:
                return True
        return None

    def collect_optional_args(
        self,
        dispatcher: 'Dispatcher',
        update: Update = None,
        check_result: Union[bool, Match] = None,
    ) -> Dict[str, object]:
        """Pass the results of ``re.match(pattern, data).{groups(), groupdict()}`` to the
        callback as a keyword arguments called ``groups`` and ``groupdict``, respectively, if
        needed.
        """
        optional_args = super().collect_optional_args(dispatcher, update, check_result)
        if self.pattern and not callable(self.pattern):
            check_result = cast(Match, check_result)
            if self.pass_groups:
                optional_args['groups'] = check_result.groups()
            if self.pass_groupdict:
                optional_args['groupdict'] = check_result.groupdict()
        return optional_args

    def collect_additional_context(
        self,
        context: CCT,
        update: Update,
        dispatcher: 'Dispatcher',
        check_result: Union[bool, Match],
    ) -> None:
        """Add the result of ``re.match(pattern, update.callback_query.data)`` to
        :attr:`CallbackContext.matches` as list with one element.
        """
        if self.pattern:
            check_result = cast(Match, check_result)
            context.matches = [check_result]