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https://github.com/python-telegram-bot/python-telegram-bot.git
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185 lines
7.6 KiB
Python
185 lines
7.6 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) 2015-2022
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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 PrefixHandler class."""
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import itertools
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from typing import TYPE_CHECKING, Dict, List, Optional, Tuple, 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 SCT, DVInput
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from telegram.ext import filters as filters_module
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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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if TYPE_CHECKING:
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from telegram.ext import Application
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RT = TypeVar("RT")
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class PrefixHandler(BaseHandler[Update, CCT]):
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"""BaseHandler class to handle custom prefix commands.
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This is an intermediate handler between :class:`MessageHandler` and :class:`CommandHandler`.
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It supports configurable commands with the same options as :class:`CommandHandler`. It will
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respond to every combination of :paramref:`prefix` and :paramref:`command`.
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It will add a :obj:`list` to the :class:`CallbackContext` named :attr:`CallbackContext.args`,
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containing a list of strings, which is the text following the command split on single or
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consecutive whitespace characters.
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Examples:
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Single prefix and command:
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.. code:: python
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PrefixHandler("!", "test", callback) # will respond to '!test'.
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Multiple prefixes, single command:
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.. code:: python
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PrefixHandler(["!", "#"], "test", callback) # will respond to '!test' and '#test'.
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Multiple prefixes and commands:
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.. code:: python
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PrefixHandler(
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["!", "#"], ["test", "help"], callback
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) # will respond to '!test', '#test', '!help' and '#help'.
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By default, the handler listens to messages as well as edited messages. To change this behavior
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use :attr:`~filters.UpdateType.EDITED_MESSAGE <telegram.ext.filters.UpdateType.EDITED_MESSAGE>`
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Note:
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* :class:`PrefixHandler` does *not* handle (edited) channel posts.
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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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.. versionchanged:: 20.0
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* :class:`PrefixHandler` is no longer a subclass of :class:`CommandHandler`.
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* Removed the attributes ``command`` and ``prefix``. Instead, the new :attr:`commands`
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contains all commands that this handler listens to as a :class:`frozenset`, which
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includes the prefixes.
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* Updating the prefixes and commands this handler listens to is no longer possible.
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Args:
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prefix (:obj:`str` | Collection[:obj:`str`]):
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The prefix(es) that will precede :paramref:`command`.
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command (:obj:`str` | Collection[:obj:`str`]):
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The command or list of commands this handler should listen for. Case-insensitive.
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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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filters (:class:`telegram.ext.filters.BaseFilter`, optional): 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 :keyword:`and`, ``|`` for :keyword:`or`, ``~`` for :keyword:`not`)
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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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Attributes:
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commands (FrozenSet[:obj:`str`]): The commands that this handler will listen for, i.e. the
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combinations of :paramref:`prefix` and :paramref:`command`.
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callback (:term:`coroutine function`): The callback function for this handler.
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filters (:class:`telegram.ext.filters.BaseFilter`): Optional. Only allow updates with these
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Filters.
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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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# 'prefix' is a class property, & 'command' is included in the superclass, so they're left out.
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__slots__ = ("commands", "filters")
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def __init__(
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self,
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prefix: SCT[str],
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command: SCT[str],
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callback: HandlerCallback[Update, CCT, RT],
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filters: filters_module.BaseFilter = None,
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block: DVInput[bool] = DEFAULT_TRUE,
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):
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super().__init__(callback=callback, block=block)
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if isinstance(prefix, str):
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prefixes = {prefix.lower()}
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else:
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prefixes = {x.lower() for x in prefix}
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if isinstance(command, str):
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commands = {command.lower()}
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else:
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commands = {x.lower() for x in command}
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self.commands = frozenset(p + c for p, c in itertools.product(prefixes, commands))
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self.filters = filters if filters is not None else filters_module.UpdateType.MESSAGES
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def check_update(
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self, update: object
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) -> Optional[Union[bool, Tuple[List[str], Optional[Union[bool, Dict]]]]]:
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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:`list`: The list of args for the handler.
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"""
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if isinstance(update, Update) and update.effective_message:
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message = update.effective_message
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if message.text:
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text_list = message.text.split()
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if text_list[0].lower() not in self.commands:
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return None
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filter_result = self.filters.check_update(update)
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if filter_result:
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return text_list[1:], filter_result
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return 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",
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check_result: Optional[Union[bool, Tuple[List[str], Optional[bool]]]],
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) -> None:
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"""Add text after the command to :attr:`CallbackContext.args` as list, split on single
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whitespaces and add output of data filters to :attr:`CallbackContext` as well.
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"""
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if isinstance(check_result, tuple):
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context.args = check_result[0]
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if isinstance(check_result[1], dict):
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context.update(check_result[1])
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