feat: ForwardedMessage filter (#355)

* feat: ForwardedMessage filter
* fix: add tests
* fix: attr name

aiogram/dispatcher/dispatcher.py

@@ -10,7 +10,7 @@ from aiohttp.helpers import sentinel
 
 from aiogram.utils.deprecated import renamed_argument
 from .filters import Command, ContentTypeFilter, ExceptionsFilter, FiltersFactory, HashTag, Regexp, \
-    RegexpCommandsFilter, StateFilter, Text, IDFilter, AdminFilter, IsReplyFilter
+    RegexpCommandsFilter, StateFilter, Text, IDFilter, AdminFilter, IsReplyFilter, ForwardedMessageFilter
 from .filters.builtin import IsSenderContact
 from .handler import Handler
 from .middlewares import MiddlewareManager
@@ -160,6 +160,12 @@ class Dispatcher(DataMixin, ContextInstanceMixin):
             self.channel_post_handlers,
             self.edited_channel_post_handlers,
         ])
+        filters_factory.bind(ForwardedMessageFilter, event_handlers=[
+            self.message_handlers,
+            self.edited_channel_post_handlers,
+            self.channel_post_handlers,
+            self.edited_channel_post_handlers
+        ])
 
     def __del__(self):
         self.stop_polling()

aiogram/dispatcher/filters/__init__.py

@@ -1,6 +1,6 @@
 from .builtin import Command, CommandHelp, CommandPrivacy, CommandSettings, CommandStart, ContentTypeFilter, \
     ExceptionsFilter, HashTag, Regexp, RegexpCommandsFilter, StateFilter, \
-    Text, IDFilter, AdminFilter, IsReplyFilter, IsSenderContact
+    Text, IDFilter, AdminFilter, IsReplyFilter, IsSenderContact, ForwardedMessageFilter
 from .factory import FiltersFactory
 from .filters import AbstractFilter, BoundFilter, Filter, FilterNotPassed, FilterRecord, execute_filter, \
     check_filters, get_filter_spec, get_filters_spec
@@ -32,4 +32,5 @@ __all__ = [
     'get_filters_spec',
     'execute_filter',
     'check_filters',
+    'ForwardedMessageFilter',
 ]

aiogram/dispatcher/filters/builtin.py

@@ -681,3 +681,13 @@ class IsReplyFilter(BoundFilter):
             return {'reply': msg.reply_to_message}
         elif not msg.reply_to_message and not self.is_reply:
             return True
+
+
+class ForwardedMessageFilter(BoundFilter):
+    key = 'is_forwarded'
+
+    def __init__(self, is_forwarded: bool):
+        self.is_forwarded = is_forwarded
+
+    async def check(self, message: Message):
+        return bool(getattr(message, "forward_date")) is self.is_forwarded