#289 Added the ability to change thumbnails of sticker sets created by the bot using the method setStickerSetThumb.

aiogram/bot/api.py

@@ -225,6 +225,7 @@ class Methods(Helper):
     ADD_STICKER_TO_SET = Item()  # addStickerToSet
     SET_STICKER_POSITION_IN_SET = Item()  # setStickerPositionInSet
     DELETE_STICKER_FROM_SET = Item()  # deleteStickerFromSet
+    SET_STICKER_SET_THUMB = Item()  # setStickerSetThumb
 
     # Inline mode
     ANSWER_INLINE_QUERY = Item()  # answerInlineQuery

aiogram/bot/bot.py

@@ -1970,6 +1970,39 @@ class Bot(BaseBot, DataMixin, ContextInstanceMixin):
         result = await self.request(api.Methods.DELETE_STICKER_FROM_SET, payload)
         return result
 
+    async def set_sticker_set_thumb(self,
+                                    name: base.String,
+                                    user_id: base.Integer,
+                                    thumb: typing.Union[base.InputFile, base.String] = None) -> base.Boolean:
+        """
+        Use this method to set the thumbnail of a sticker set.
+        Animated thumbnails can be set for animated sticker sets only.
+
+        Source: https://core.telegram.org/bots/api#setstickersetthumb
+
+        :param name: Sticker set name
+        :type name: :obj:`base.String`
+        :param user_id: User identifier of the sticker set owner
+        :type user_id: :obj:`base.Integer`
+        :param thumb: A PNG image with the thumbnail, must be up to 128 kilobytes in size and have width and height
+            exactly 100px, or a TGS animation with the thumbnail up to 32 kilobytes in size;
+            see https://core.telegram.org/animated_stickers#technical-requirements for animated sticker technical
+            requirements. Pass a file_id as a String to send a file that already exists on the Telegram servers,
+            pass an HTTP URL as a String for Telegram to get a file from the Internet, or upload a new one using
+            multipart/form-data. More info on https://core.telegram.org/bots/api#sending-files.
+            Animated sticker set thumbnail can't be uploaded via HTTP URL.
+        :type thumb: :obj:`typing.Union[base.InputFile, base.String]`
+        :return: Returns True on success
+        :rtype: :obj:`base.Boolean`
+        """
+        payload = generate_payload(**locals(), exclude=['thumb'])
+
+        files = {}
+        prepare_file(payload, files, 'thumb', thumb)
+
+        result = await self.request(api.Methods.SET_STICKER_SET_THUMB, payload, files)
+        return result
+
     async def answer_inline_query(self, inline_query_id: base.String,
                                   results: typing.List[types.InlineQueryResult],
                                   cache_time: typing.Union[base.Integer, None] = None,