feat: add client subscription startup policy

apps/api/views.py

@@ -1,5 +1,6 @@
 import logging
 
+from config.client_subscription_policy import get_client_subscription_policy
 from django.http import HttpResponse
 from django.utils import timezone
 from django.utils.decorators import method_decorator
@@ -651,11 +652,12 @@ class MigrationRequestDetailView(ExternalApiView):
         )
 
 
-def _release_unpublished_response(platform: str) -> dict:
+def _release_unpublished_response(platform: str, client_policy: dict) -> dict:
     return {
         "platform": platform,
         "release": None,
         "message": "暂未发布",
+        "client_policy": client_policy,
     }
 
 
@@ -673,15 +675,18 @@ class ClientLatestReleaseView(APIView):
     permission_classes = (AllowAny,)
 
     def get(self, request):
+        client_policy = get_client_subscription_policy()
         platform = (
             request.query_params.get("platform")
             or DownloadRelease.Platform.WINDOWS
         ).strip().lower()
         if platform not in DownloadRelease.Platform.values:
-            return Response(
+            response = Response(
                 api_error("bad_request", "参数错误"),
                 status=status.HTTP_400_BAD_REQUEST,
             )
+            response["Cache-Control"] = "no-store"
+            return response
 
         release = (
             DownloadRelease.objects.filter(platform=platform, is_current=True)
@@ -689,19 +694,23 @@ class ClientLatestReleaseView(APIView):
             .first()
         )
         if release is None:
-            return Response(
-                _release_unpublished_response(platform),
+            response = Response(
+                _release_unpublished_response(platform, client_policy),
                 status=status.HTTP_200_OK,
             )
+            response["Cache-Control"] = "no-store"
+            return response
 
         download_url = _absolute_download_url(request, release)
         if not download_url:
-            return Response(
-                _release_unpublished_response(platform),
+            response = Response(
+                _release_unpublished_response(platform, client_policy),
                 status=status.HTTP_200_OK,
             )
+            response["Cache-Control"] = "no-store"
+            return response
 
-        return Response(
+        response = Response(
             {
                 "platform": platform,
                 "release": {
@@ -713,9 +722,12 @@ class ClientLatestReleaseView(APIView):
                     "size_bytes": release.size_bytes,
                     "published_at": timezone.localtime(release.updated_at).isoformat(),
                 },
+                "client_policy": client_policy,
             },
             status=status.HTTP_200_OK,
         )
+        response["Cache-Control"] = "no-store"
+        return response
 
 
 class PortalSessionApiView(APIView):