Fix type information on assert_*_is_admin methods (#7645)

These things don't return Deferreds.

changelog.d/7645.misc

@@ -0,0 +1 @@
+Fix type information on `assert_*_is_admin` methods.

synapse/api/auth.py

@@ -510,16 +510,16 @@ class Auth(object):
         request.authenticated_entity = service.sender
         return defer.succeed(service)
 
-    def is_server_admin(self, user):
+    async def is_server_admin(self, user: UserID) -> bool:
         """ Check if the given user is a local server admin.
 
         Args:
-            user (UserID): user to check
+            user: user to check
 
         Returns:
-            bool: True if the user is an admin
+            True if the user is an admin
         """
-        return self.store.is_server_admin(user)
+        return await self.store.is_server_admin(user)
 
     def compute_auth_events(
         self, event, current_state_ids: StateMap[str], for_verification: bool = False,

synapse/rest/admin/_base.py

@@ -15,7 +15,11 @@
 
 import re
 
+import twisted.web.server
+
+import synapse.api.auth
 from synapse.api.errors import AuthError
+from synapse.types import UserID
 
 
 def historical_admin_path_patterns(path_regex):
@@ -55,41 +59,32 @@ def admin_patterns(path_regex: str):
     return patterns
 
 
-async def assert_requester_is_admin(auth, request):
+async def assert_requester_is_admin(
+    auth: synapse.api.auth.Auth, request: twisted.web.server.Request
+) -> None:
     """Verify that the requester is an admin user
 
-    WARNING: MAKE SURE YOU YIELD ON THE RESULT!
-
     Args:
-        auth (synapse.api.auth.Auth):
-        request (twisted.web.server.Request): incoming request
-
-    Returns:
-        Deferred
+        auth: api.auth.Auth singleton
+        request: incoming request
 
     Raises:
-        AuthError if the requester is not an admin
+        AuthError if the requester is not a server admin
     """
     requester = await auth.get_user_by_req(request)
     await assert_user_is_admin(auth, requester.user)
 
 
-async def assert_user_is_admin(auth, user_id):
+async def assert_user_is_admin(auth: synapse.api.auth.Auth, user_id: UserID) -> None:
     """Verify that the given user is an admin user
 
-    WARNING: MAKE SURE YOU YIELD ON THE RESULT!
-
     Args:
-        auth (synapse.api.auth.Auth):
-        user_id (UserID):
-
-    Returns:
-        Deferred
+        auth: api.auth.Auth singleton
+        user_id: user to check
 
     Raises:
-        AuthError if the user is not an admin
+        AuthError if the user is not a server admin
     """
-
     is_admin = await auth.is_server_admin(user_id)
     if not is_admin:
         raise AuthError(403, "You are not a server admin")