fix: Sync jsonrpc and rest implementation of authenticated agent card

src/a2a/server/request_handlers/jsonrpc_handler.py

@@ -1,55 +1,53 @@
 import logging
-
 from collections.abc import AsyncIterable, Callable
 
 from a2a.server.context import ServerCallContext
 from a2a.server.request_handlers.request_handler import RequestHandler
 from a2a.server.request_handlers.response_helpers import prepare_response_object
 from a2a.types import (
     AgentCard,
     AuthenticatedExtendedCardNotConfiguredError,
     CancelTaskRequest,
     CancelTaskResponse,
     CancelTaskSuccessResponse,
     DeleteTaskPushNotificationConfigRequest,
     DeleteTaskPushNotificationConfigResponse,
     DeleteTaskPushNotificationConfigSuccessResponse,
     GetAuthenticatedExtendedCardRequest,
     GetAuthenticatedExtendedCardResponse,
     GetAuthenticatedExtendedCardSuccessResponse,
     GetTaskPushNotificationConfigRequest,
     GetTaskPushNotificationConfigResponse,
     GetTaskPushNotificationConfigSuccessResponse,
     GetTaskRequest,
     GetTaskResponse,
     GetTaskSuccessResponse,
     InternalError,
     JSONRPCErrorResponse,
     ListTaskPushNotificationConfigRequest,
     ListTaskPushNotificationConfigResponse,
     ListTaskPushNotificationConfigSuccessResponse,
     Message,
     SendMessageRequest,
     SendMessageResponse,
     SendMessageSuccessResponse,
     SendStreamingMessageRequest,
     SendStreamingMessageResponse,
     SendStreamingMessageSuccessResponse,
     SetTaskPushNotificationConfigRequest,
     SetTaskPushNotificationConfigResponse,
     SetTaskPushNotificationConfigSuccessResponse,
     Task,
     TaskArtifactUpdateEvent,
     TaskNotFoundError,
     TaskPushNotificationConfig,
     TaskResubscriptionRequest,
     TaskStatusUpdateEvent,
 )
 from a2a.utils.errors import ServerError
 from a2a.utils.helpers import validate
 from a2a.utils.telemetry import SpanKind, trace_class
 
-
 logger = logging.getLogger(__name__)
 
 
@@ -425,14 +423,10 @@
         Returns:
             A `GetAuthenticatedExtendedCardResponse` object containing the config or a JSON-RPC error.
         """
-        if (
-            self.extended_agent_card is None
-            and self.extended_card_modifier is None
-        ):
-            return GetAuthenticatedExtendedCardResponse(
-                root=JSONRPCErrorResponse(
-                    id=request.id,
-                    error=AuthenticatedExtendedCardNotConfiguredError(),
+        if not self.agent_card.supports_authenticated_extended_card:
+            raise ServerError(
+                error=AuthenticatedExtendedCardNotConfiguredError(
+                    message='Authenticated card not supported'
                 )
             )