feat: add ChatType builtin filter

aiogram/dispatcher/filters/builtin.py

@@ -1,6 +1,7 @@
 import inspect
 import re
 import typing
+from collections import Container
 from contextvars import ContextVar
 from dataclasses import dataclass, field
 from typing import Any, Dict, Iterable, Optional, Union
@@ -694,14 +695,17 @@ async def check(self, message: Message):
 
 
 class ChatTypeFilter(BoundFilter):
-    key = 'chat_types'
+    key = 'chat_type'
 
-    def __init__(self, chat_types: typing.List[ChatType]):
-        self.chat_types = chat_types
+    def __init__(self, chat_type: typing.Container[ChatType]):
+        if isinstance(chat_type, str):
+            chat_type = {chat_type}
+
+        self.chat_type: typing.Set[str] = set(chat_type)
 
     async def check(self, obj: Union[Message, CallbackQuery]):
         if isinstance(obj, Message):
             obj = obj.chat
         if isinstance(obj, CallbackQuery):
             obj = obj.message.chat
-        return obj.type in self.chat_types
+        return obj.type in self.chat_type

examples/chat_types_filter.py → examples/chat_type_filter.py

@@ -6,6 +6,7 @@
 import logging
 
 from aiogram import Bot, Dispatcher, executor, types
+from aiogram.dispatcher.handler import SkipHandler
 from aiogram.types import ChatType
 
 API_TOKEN = 'BOT TOKEN HERE'
@@ -18,13 +19,24 @@
 dp = Dispatcher(bot)
 
 
-@dp.message_handler(chat_types=[ChatType.PRIVATE, ChatType.CHANNEL])
+@dp.message_handler(chat_type=[ChatType.PRIVATE, ChatType.CHANNEL])
 async def send_welcome(message: types.Message):
     """
     This handler will be called when user sends `/start` or `/help` command
     """
     await message.reply("Hi!\nI'm hearing your messages in private chats and channels")
 
+    # propagate message to the next handler
+    raise SkipHandler
+
+
+@dp.message_handler(chat_type=ChatType.PRIVATE)
+async def send_welcome(message: types.Message):
+    """
+    This handler will be called when user sends `/start` or `/help` command
+    """
+    await message.reply("Hi!\nI'm hearing your messages only in private chats")
+
 
 if __name__ == '__main__':
     executor.start_polling(dp, skip_updates=True)