From 3328979f28732dfe1d92b677354bd588f267b77b Mon Sep 17 00:00:00 2001
From: Oleg A <t0rr@mail.ru>
Date: Thu, 5 Nov 2020 18:45:10 +0300
Subject: [PATCH] AIOG-T-77 Added the method unpinAllChatMessages, which can be
 used to unpin all pinned messages in a chat.

---
 aiogram/bot/api.py    |  1 +
 aiogram/bot/bot.py    | 23 +++++++++++++++++++++++
 aiogram/types/chat.py | 16 ++++++++++++++++
 3 files changed, 40 insertions(+)

diff --git a/aiogram/bot/api.py b/aiogram/bot/api.py
index a4379334..ba4bd2b1 100644
--- a/aiogram/bot/api.py
+++ b/aiogram/bot/api.py
@@ -200,6 +200,7 @@ class Methods(Helper):
     SET_CHAT_DESCRIPTION = Item()  # setChatDescription
     PIN_CHAT_MESSAGE = Item()  # pinChatMessage
     UNPIN_CHAT_MESSAGE = Item()  # unpinChatMessage
+    UNPIN_ALL_CHAT_MESSAGES = Item()  # unpinAllChatMessages
     LEAVE_CHAT = Item()  # leaveChat
     GET_CHAT = Item()  # getChat
     GET_CHAT_ADMINISTRATORS = Item()  # getChatAdministrators
diff --git a/aiogram/bot/bot.py b/aiogram/bot/bot.py
index fda35703..9ccf0c5f 100644
--- a/aiogram/bot/bot.py
+++ b/aiogram/bot/bot.py
@@ -1512,6 +1512,29 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         result = await self.request(api.Methods.UNPIN_CHAT_MESSAGE, payload)
         return result
 
+    async def unpin_all_chat_messages(self,
+                                      chat_id: typing.Union[base.Integer, base.String],
+                                      ) -> base.Boolean:
+        """
+        Use this method to clear the list of pinned messages in a chat. If the chat
+        is not a private chat, the bot must be an administrator in the chat for this
+        to work and must have the 'can_pin_messages' admin right in a supergroup or
+        'can_edit_messages' admin right in a channel. Returns True on success.
+
+        Source: https://core.telegram.org/bots/api#unpinallchatmessages
+
+        :param chat_id: Unique identifier for the target chat or username of the
+            target channel (in the format @channelusername)
+        :type chat_id: :obj:`typing.Union[base.Integer, base.String]`
+
+        :return: Returns True on success
+        :rtype: :obj:`base.Boolean`
+        """
+        payload = generate_payload(**locals())
+
+        result = await self.request(api.Methods.UNPIN_ALL_CHAT_MESSAGES, payload)
+        return result
+
     async def leave_chat(self, chat_id: typing.Union[base.Integer, base.String]) -> base.Boolean:
         """
         Use this method for your bot to leave a group, supergroup or channel.
diff --git a/aiogram/types/chat.py b/aiogram/types/chat.py
index 0380fbed..901e2052 100644
--- a/aiogram/types/chat.py
+++ b/aiogram/types/chat.py
@@ -409,6 +409,22 @@ class Chat(base.TelegramObject):
             message_id=message_id,
         )
 
+    async def unpin_all_messages(self):
+        """
+        Use this method to clear the list of pinned messages in a chat. If the chat
+        is not a private chat, the bot must be an administrator in the chat for this
+        to work and must have the 'can_pin_messages' admin right in a supergroup or
+        'can_edit_messages' admin right in a channel. Returns True on success.
+
+        Source: https://core.telegram.org/bots/api#unpinallchatmessages
+
+        :return: Returns True on success
+        :rtype: :obj:`base.Boolean`
+        """
+        return await self.bot.unpin_all_chat_messages(
+            chat_id=self.id,
+        )
+
     async def leave(self) -> base.Boolean:
         """
         Use this method for your bot to leave a group, supergroup or channel.