Fix "There is no current event loop" error in auth module

Fix #1273

Author: FeodorFitsner

sdk/python/packages/flet-core/src/flet_core/locks.py

@@ -0,0 +1,14 @@
+class NopeLock(object):
+    def __enter__(self):
+        pass
+
+    def __exit__(self, *args):
+        pass
+
+
+class AsyncNopeLock(object):
+    async def __aenter__(self):
+        pass
+
+    async def __aexit__(self, *args):
+        pass

sdk/python/packages/flet-core/src/flet_core/page.py

@@ -19,6 +19,7 @@
 from flet_core.event import Event
 from flet_core.event_handler import EventHandler
 from flet_core.floating_action_button import FloatingActionButton
+from flet_core.locks import AsyncNopeLock, NopeLock
 from flet_core.navigation_bar import NavigationBar
 from flet_core.protocol import Command
 from flet_core.querystring import QueryString
@@ -64,22 +65,6 @@ def __init__(self, pubsubhub, session_id) -> None:
     from typing_extensions import Literal
 
 
-class NopeLock(object):
-    def __enter__(self):
-        pass
-
-    def __exit__(self, *args):
-        pass
-
-
-class AsyncNopeLock(object):
-    async def __aenter__(self):
-        pass
-
-    async def __aexit__(self, *args):
-        pass
-
-
 class Page(Control):
     """
     Page is a container for `View` (https://flet.dev/docs/controls/view) controls.

sdk/python/packages/flet/src/flet/auth/authorization.py

@@ -10,6 +10,8 @@
 from flet.auth.oauth_token import OAuthToken
 from flet.auth.user import User
 from flet.version import version
+from flet_core.locks import AsyncNopeLock, NopeLock
+from flet_core.utils import is_asyncio
 from oauthlib.oauth2 import WebApplicationClient
 from oauthlib.oauth2.rfc6749.tokens import OAuth2Token
 
@@ -28,8 +30,8 @@ def __init__(
         self.provider = provider
         self.__token: Optional[OAuthToken] = None
         self.user: Optional[User] = None
-        self.__lock = threading.Lock()
-        self.__async_lock = asyncio.Lock()
+        self.__lock = threading.Lock() if not is_asyncio() else NopeLock()
+        self.__async_lock = asyncio.Lock() if is_asyncio() else AsyncNopeLock()
 
         # fix scopes
         self.scope.extend(self.provider.scopes)

sdk/python/packages/flet/src/flet/pubsub.py

@@ -4,14 +4,16 @@
 from typing import Any, Callable, Dict, Iterable
 
 import flet
+from flet_core.locks import AsyncNopeLock, NopeLock
+from flet_core.utils import is_asyncio
 
 logger = logging.getLogger(flet.__name__)
 
 
 class PubSubHub:
     def __init__(self):
-        self.__lock = threading.Lock()
-        self.__async_lock = asyncio.Lock()
+        self.__lock = threading.Lock() if not is_asyncio() else NopeLock()
+        self.__async_lock = asyncio.Lock() if is_asyncio() else AsyncNopeLock()
         self.__subscribers: Dict[str, Callable] = {}  # key: session_id, value: handler
         self.__topic_subscribers: Dict[
             str, Dict[str, Callable]