simple aiogram middleware for bans

from typing import Callable, Dict, Any, Awaitable

from aiogram import BaseMiddleware
from aiogram.types import TelegramObject

from bot.db.requests import Database  # your class with database queries


class IsBanedMiddleware(BaseMiddleware):
    async def __call__(
        self,
        handler: Callable[[TelegramObject, Dict[str, Any]], Awaitable[Any]],
        event: TelegramObject,
        data: Dict[str, Any],
    ) -> Any:
        user_id = data['event_from_user'].id
        db: Database = data['db']
        banned = await db.get_ban_user(user_id)
        if banned:
            return
        return await handler(event, data)