MSC2918: use attr.s instead of TypedDict

Signed-off-by: Quentin Gliech <quentingliech@gmail.com>

synapse/handlers/register.py

@@ -19,7 +19,7 @@
 from typing import TYPE_CHECKING, Iterable, List, Optional, Tuple
 
 from prometheus_client import Counter
-from typing_extensions import TypedDict
+import attr
 
 from synapse import types
 from synapse.api.constants import MAX_USERID_LENGTH, EventTypes, JoinRules, LoginType
@@ -56,15 +56,13 @@
     ["guest", "auth_provider"],
 )
 
-LoginDict = TypedDict(
-    "LoginDict",
-    {
-        "device_id": str,
-        "access_token": str,
-        "valid_until_ms": Optional[int],
-        "refresh_token": Optional[str],
-    },
-)
+
+@attr.s(frozen=True, slots=True)
+class DeviceRegistrationResult:
+    device_id = attr.ib(type=str)
+    access_token = attr.ib(type=str)
+    valid_until_ms = attr.ib(type=Optional[int])
+    refresh_token = attr.ib(type=Optional[str])
 
 
 class RegistrationHandler(BaseHandler):
@@ -710,10 +708,10 @@ async def register_device(
         ).inc()
 
         return (
-            res["device_id"],
-            res["access_token"],
-            res["valid_until_ms"],
-            res["refresh_token"],
+            res.device_id,
+            res.access_token,
+            res.valid_until_ms,
+            res.refresh_token,
         )
 
     async def register_device_inner(
@@ -724,7 +722,7 @@ async def register_device_inner(
         is_guest: bool = False,
         is_appservice_ghost: bool = False,
         should_issue_refresh_token: bool = False,
-    ) -> LoginDict:
+    ) -> DeviceRegistrationResult:
         """Helper for register_device
 
         Does the bits that need doing on the main process. Not for use outside this
@@ -769,12 +767,12 @@ class and RegisterDeviceReplicationServlet.
                 refresh_token_id=refresh_token_id,
             )
 
-        return {
-            "device_id": registered_device_id,
-            "access_token": access_token,
-            "valid_until_ms": valid_until_ms,
-            "refresh_token": refresh_token,
-        }
+        return DeviceRegistrationResult(
+            device_id=registered_device_id,
+            access_token=access_token,
+            valid_until_ms=valid_until_ms,
+            refresh_token=refresh_token,
+        )
 
     async def post_registration_actions(
         self, user_id: str, auth_result: dict, access_token: Optional[str]