python-telegram-bot/examples/arbitrarycallbackdatabot.py

#!/usr/bin/env python
# pylint: disable=unused-argument
# This program is dedicated to the public domain under the CC0 license.

"""This example showcases how PTBs "arbitrary callback data" feature can be used.

For detailed info on arbitrary callback data, see the wiki page at
https://github.com/python-telegram-bot/python-telegram-bot/wiki/Arbitrary-callback_data
"""
import logging
from typing import List, Tuple, cast

from telegram import InlineKeyboardButton, InlineKeyboardMarkup, Update
from telegram.ext import (
    Application,
    CallbackContext,
    CallbackQueryHandler,
    CommandHandler,
    InvalidCallbackData,
    PicklePersistence,
)

# Enable logging
logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s', level=logging.INFO
)
logger = logging.getLogger(__name__)


async def start(update: Update, context: CallbackContext.DEFAULT_TYPE) -> None:
    """Sends a message with 5 inline buttons attached."""
    number_list: List[int] = []
    await update.message.reply_text('Please choose:', reply_markup=build_keyboard(number_list))


async def help_command(update: Update, context: CallbackContext.DEFAULT_TYPE) -> None:
    """Displays info on how to use the bot."""
    await update.message.reply_text(
        "Use /start to test this bot. Use /clear to clear the stored data so that you can see "
        "what happens, if the button data is not available. "
    )


async def clear(update: Update, context: CallbackContext.DEFAULT_TYPE) -> None:
    """Clears the callback data cache"""
    context.bot.callback_data_cache.clear_callback_data()
    context.bot.callback_data_cache.clear_callback_queries()
    await update.effective_message.reply_text('All clear!')


def build_keyboard(current_list: List[int]) -> InlineKeyboardMarkup:
    """Helper function to build the next inline keyboard."""
    return InlineKeyboardMarkup.from_column(
        [InlineKeyboardButton(str(i), callback_data=(i, current_list)) for i in range(1, 6)]
    )


async def list_button(update: Update, context: CallbackContext.DEFAULT_TYPE) -> None:
    """Parses the CallbackQuery and updates the message text."""
    query = update.callback_query
    await query.answer()
    # Get the data from the callback_data.
    # If you're using a type checker like MyPy, you'll have to use typing.cast
    # to make the checker get the expected type of the callback_data
    number, number_list = cast(Tuple[int, List[int]], query.data)
    # append the number to the list
    number_list.append(number)

    await query.edit_message_text(
        text=f"So far you've selected {number_list}. Choose the next item:",
        reply_markup=build_keyboard(number_list),
    )

    # we can delete the data stored for the query, because we've replaced the buttons
    context.drop_callback_data(query)


async def handle_invalid_button(update: Update, context: CallbackContext.DEFAULT_TYPE) -> None:
    """Informs the user that the button is no longer available."""
    await update.callback_query.answer()
    await update.effective_message.edit_text(
        'Sorry, I could not process this button click 😕 Please send /start to get a new keyboard.'
    )


def main() -> None:
    """Run the bot."""
    # We use persistence to demonstrate how buttons can still work after the bot was restarted
    persistence = PicklePersistence(filepath='arbitrarycallbackdatabot')
    # Create the Application and pass it your bot's token.
    application = (
        Application.builder()
        .token("TOKEN")
        .persistence(persistence)
        .arbitrary_callback_data(True)
        .build()
    )

    application.add_handler(CommandHandler('start', start))
    application.add_handler(CommandHandler('help', help_command))
    application.add_handler(CommandHandler('clear', clear))
    application.add_handler(
        CallbackQueryHandler(handle_invalid_button, pattern=InvalidCallbackData)
    )
    application.add_handler(CallbackQueryHandler(list_button))

    # Run the bot until the user presses Ctrl-C
    application.run_polling()


if __name__ == '__main__':
    main()