From 21908739e977a5a43807222fad70f13eab68b094 Mon Sep 17 00:00:00 2001
From: Alex Root Junior <jroot.junior@gmail.com>
Date: Sun, 28 Oct 2018 17:42:21 +0200
Subject: [PATCH] Backward compatibility - implemented 'func' filter

---
 aiogram/dispatcher/dispatcher.py       |  5 ++++-
 aiogram/dispatcher/filters/__init__.py |  3 ++-
 aiogram/dispatcher/filters/builtin.py  | 17 +++++++++++++++++
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/aiogram/dispatcher/dispatcher.py b/aiogram/dispatcher/dispatcher.py
index 3c1506f8..6247f211 100644
--- a/aiogram/dispatcher/dispatcher.py
+++ b/aiogram/dispatcher/dispatcher.py
@@ -5,7 +5,7 @@ import logging
 import time
 import typing
 
-from .filters import Command, ContentTypeFilter, ExceptionsFilter, FiltersFactory, HashTag, Regexp, \
+from .filters import Command, ContentTypeFilter, ExceptionsFilter, FiltersFactory, FuncFilter, HashTag, Regexp, \
     RegexpCommandsFilter, StateFilter, Text
 from .handler import Handler
 from .middlewares import MiddlewareManager
@@ -108,6 +108,9 @@ class Dispatcher(DataMixin, ContextInstanceMixin):
         filters_factory.bind(ExceptionsFilter, event_handlers=[
             self.errors_handlers
         ])
+        filters_factory.bind(FuncFilter, exclude_event_handlers=[
+            self.errors_handlers
+        ])
 
     def __del__(self):
         self.stop_polling()
diff --git a/aiogram/dispatcher/filters/__init__.py b/aiogram/dispatcher/filters/__init__.py
index 138174cc..489e7c76 100644
--- a/aiogram/dispatcher/filters/__init__.py
+++ b/aiogram/dispatcher/filters/__init__.py
@@ -1,5 +1,5 @@
 from .builtin import Command, CommandHelp, CommandPrivacy, CommandSettings, CommandStart, ContentTypeFilter, \
-    ExceptionsFilter, HashTag, Regexp, RegexpCommandsFilter, StateFilter, Text
+    ExceptionsFilter, FuncFilter, HashTag, Regexp, RegexpCommandsFilter, StateFilter, Text
 from .factory import FiltersFactory
 from .filters import AbstractFilter, BoundFilter, Filter, FilterNotPassed, FilterRecord, check_filter, check_filters
 
@@ -14,6 +14,7 @@ __all__ = [
     'ContentTypeFilter',
     'ExceptionsFilter',
     'HashTag',
+    'FuncFilter',
     'Filter',
     'FilterNotPassed',
     'FilterRecord',
diff --git a/aiogram/dispatcher/filters/builtin.py b/aiogram/dispatcher/filters/builtin.py
index f5234472..8b739989 100644
--- a/aiogram/dispatcher/filters/builtin.py
+++ b/aiogram/dispatcher/filters/builtin.py
@@ -7,6 +7,7 @@ from typing import Any, Dict, Iterable, Optional, Union
 from aiogram import types
 from aiogram.dispatcher.filters.filters import BoundFilter, Filter
 from aiogram.types import CallbackQuery, Message
+from aiogram.utils.deprecated import warn_deprecated
 
 
 class Command(Filter):
@@ -369,6 +370,22 @@ class StateFilter(BoundFilter):
         return False
 
 
+class FuncFilter(BoundFilter):
+    key = 'func'
+
+    def __init__(self, dispatcher, func):
+        self.dispatcher = dispatcher
+        self.func = func
+
+        warn_deprecated('"func" filter will be removed in 2.1 version.\n'
+                        'Read mode: https://aiogram.readthedocs.io/en/dev-2.x/migration_1_to_2.html#custom-filters',
+                        stacklevel=8)
+
+    async def check(self, obj) -> bool:
+        from .filters import check_filter
+        return await check_filter(self.dispatcher, self.func, (obj,))
+
+
 class ExceptionsFilter(BoundFilter):
     """
     Filter for exceptions