Add unpin_chat_message method

pyrogram/client/methods/chats/__init__.py

@@ -30,6 +30,7 @@ from .set_chat_description import SetChatDescription
 from .set_chat_photo import SetChatPhoto
 from .set_chat_title import SetChatTitle
 from .unban_chat_member import UnbanChatMember
+from .unpin_chat_message import UnpinChatMessage
 
 
 class Chats(
@@ -46,6 +47,7 @@ class Chats(
     DeleteChatPhoto,
     SetChatTitle,
     SetChatDescription,
-    PinChatMessage
+    PinChatMessage,
+    UnpinChatMessage
 ):
     pass

pyrogram/client/methods/chats/unpin_chat_message.py

@@ -0,0 +1,40 @@
+# Pyrogram - Telegram MTProto API Client Library for Python
+# Copyright (C) 2017-2018 Dan Tès <https://github.com/delivrance>
+#
+# This file is part of Pyrogram.
+#
+# Pyrogram is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Pyrogram is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with Pyrogram.  If not, see <http://www.gnu.org/licenses/>.
+
+from pyrogram.api import functions, types
+from ...ext import BaseClient
+
+
+class UnpinChatMessage(BaseClient):
+    def unpin_chat_message(self, chat_id: int or str):
+        # TODO: Docstrings
+        peer = self.resolve_peer(chat_id)
+
+        if isinstance(peer, types.InputPeerChannel):
+            self.send(
+                functions.channels.UpdatePinnedMessage(
+                    channel=peer,
+                    id=0
+                )
+            )
+        elif isinstance(peer, types.InputPeerChat):
+            raise ValueError("The chat_id \"{}\" belongs to a basic group".format(chat_id))
+        else:
+            raise ValueError("The chat_id \"{}\" belongs to a user".format(chat_id))
+
+        return True