implement guild stickers

discord/client.py

@@ -60,6 +60,7 @@ from .appinfo import AppInfo
 from .ui.view import View
 from .stage_instance import StageInstance
 from .threads import Thread
+from .sticker import GuildSticker, StandardSticker, StickerPack, _sticker_factory
 
 if TYPE_CHECKING:
     from .abc import SnowflakeTime, PrivateChannel, GuildChannel, Snowflake
@@ -277,6 +278,14 @@ class Client:
         """List[:class:`.Emoji`]: The emojis that the connected client has."""
         return self._connection.emojis
 
+    @property
+    def stickers(self) -> List[GuildSticker]:
+        """List[:class:`GuildSticker`]: The stickers that the connected client has.
+
+        .. versionadded:: 2.0
+        """
+        return self._connection.stickers
+
     @property
     def cached_messages(self) -> Sequence[Message]:
         """Sequence[:class:`.Message`]: Read-only list of messages the connected client has cached.
@@ -777,6 +786,23 @@ class Client:
         """
         return self._connection.get_emoji(id)
 
+    def get_sticker(self, id: int) -> Optional[GuildSticker]:
+        """Returns a guild sticker with the given ID.
+
+        .. versionadded:: 2.0
+
+        .. note::
+
+            To retrieve standard stickers, use :meth:`.fetch_sticker`.
+            or :meth:`.fetch_nitro_sticker_packs`.
+
+        Returns
+        --------
+        Optional[:class:`.GuildSticker`]
+            The sticker or ``None`` if not found.
+        """
+        return self._connection.get_sticker(id)
+
     def get_all_channels(self) -> Generator[GuildChannel, None, None]:
         """A generator that retrieves every :class:`.abc.GuildChannel` the client can 'access'.
 
@@ -1443,6 +1469,49 @@ class Client:
         data = await self.http.get_webhook(webhook_id)
         return Webhook.from_state(data, state=self._connection)
 
+    async def fetch_sticker(self, sticker_id: int) -> Union[StandardSticker, GuildSticker]:
+        """|coro|
+
+        Retrieves a :class:`.Sticker` with the specified ID.
+
+        .. versionadded:: 2.0
+
+        Raises
+        --------
+        :exc:`.HTTPException`
+            Retrieving the sticker failed.
+        :exc:`.NotFound`
+            Invalid sticker ID.
+
+        Returns
+        --------
+        Union[:class:`.StandardSticker`, :class:`.GuildSticker`]
+            The sticker you requested.
+        """
+        data = await self.http.get_sticker(sticker_id)
+        cls, _ = _sticker_factory(data['type'])  # type: ignore
+        return cls(state=self._connection, data=data) # type: ignore
+
+    async def fetch_nitro_sticker_packs(self) -> List[StickerPack]:
+        """|coro|
+
+        Retrieves all available nitro sticker packs.
+
+        .. versionadded:: 2.0
+
+        Raises
+        -------
+        :exc:`.HTTPException`
+            Retrieving the sticker packs failed.
+
+        Returns
+        ---------
+        List[:class:`.StickerPack`]
+            All available nitro sticker packs.
+        """
+        data = await self.http.list_nitro_sticker_packs()
+        return [StickerPack(state=self._connection, data=pack) for pack in data['sticker_packs']]
+
     async def create_dm(self, user: Snowflake) -> DMChannel:
         """|coro|