fix: serialize HWID top-up validity dates

backend/bot/app/web/webapp/billing.py

@@ -4,6 +4,29 @@ from ._runtime import *  # noqa: F403,F405
 from bot.app.web.webapp.cache_helpers import invalidate_webapp_user_caches
 
 
+def _billing_iso_datetime(value: Optional[Any]) -> Optional[str]:
+    if not value:
+        return None
+    if isinstance(value, datetime):
+        normalized = value if value.tzinfo else value.replace(tzinfo=timezone.utc)
+        return normalized.isoformat()
+    return str(value)
+
+
+def _billing_datetime_text(value: Optional[Any]) -> Optional[str]:
+    if not value:
+        return None
+    if isinstance(value, datetime):
+        normalized = value if value.tzinfo else value.replace(tzinfo=timezone.utc)
+        return normalized.strftime("%d.%m.%Y %H:%M")
+    text = str(value)
+    try:
+        normalized = datetime.fromisoformat(text.replace("Z", "+00:00"))
+        return normalized.strftime("%d.%m.%Y %H:%M")
+    except Exception:
+        return text
+
+
 async def apply_promo_route(request: web.Request) -> web.Response:
     user_id = _require_user_id(request)
     payload = await _read_json(request)
@@ -619,6 +642,12 @@ async def device_topup_options_route(request: web.Request) -> web.Response:
         lang = db_user.language_code or settings.DEFAULT_LANGUAGE
         active = await subscription_service.get_active_subscription_details(session, user_id)
         renewal_available = bool(active and active.get("device_topup_renewal_available"))
+        extra_hwid_valid_until = (
+            active.get("extra_hwid_devices_valid_until") if active else None
+        )
+        extra_hwid_valid_until_text = (
+            active.get("extra_hwid_devices_valid_until_text") if active else None
+        ) or _billing_datetime_text(extra_hwid_valid_until)
         packages = tariff.hwid_device_packages
         rub_counts = {int(package.count) for package in (packages.rub if packages else [])}
         stars_counts = {int(package.count) for package in (packages.stars if packages else [])}
@@ -687,14 +716,10 @@ async def device_topup_options_route(request: web.Request) -> web.Response:
                 "extra_hwid_devices": int(active.get("extra_hwid_devices") or 0)
                 if active
                 else int(sub.extra_hwid_devices or 0),
-                "extra_hwid_devices_valid_until": active.get("extra_hwid_devices_valid_until")
-                if active
-                else None,
-                "extra_hwid_devices_valid_until_text": active.get(
-                    "extra_hwid_devices_valid_until_text"
-                )
-                if active
-                else None,
+                "extra_hwid_devices_valid_until": _billing_iso_datetime(
+                    extra_hwid_valid_until
+                ),
+                "extra_hwid_devices_valid_until_text": extra_hwid_valid_until_text,
                 "renewal_available": renewal_available,
                 "renewal_recommended_count": int(active.get("extra_hwid_devices") or 0)
                 if active and renewal_available

tests/test_webapp_device_topup_options.py

@@ -0,0 +1,96 @@
+import json
+from datetime import datetime, timezone
+from types import SimpleNamespace
+from unittest import IsolatedAsyncioTestCase
+from unittest.mock import AsyncMock, patch
+
+import bot.app.web.subscription_webapp  # noqa: F401
+from bot.app.web.webapp import billing as billing_module
+
+
+class _SessionFactory:
+    def __call__(self):
+        return self
+
+    async def __aenter__(self):
+        return SimpleNamespace()
+
+    async def __aexit__(self, exc_type, exc, tb):
+        return False
+
+
+class WebAppDeviceTopupOptionsTests(IsolatedAsyncioTestCase):
+    async def test_serializes_active_hwid_validity_window(self):
+        active_until = datetime(2099, 1, 2, 3, 4, tzinfo=timezone.utc)
+        valid_from = datetime(2099, 1, 1, 3, 4, tzinfo=timezone.utc)
+        tariff = SimpleNamespace(
+            key="standard",
+            billing_model="period",
+            hwid_device_packages=SimpleNamespace(
+                rub=[SimpleNamespace(count=1)],
+                stars=[],
+            ),
+            name=lambda lang: "Standard",
+        )
+        settings = SimpleNamespace(
+            MY_DEVICES_SECTION_ENABLED=True,
+            tariffs_config=SimpleNamespace(require=lambda key: tariff),
+            DEFAULT_LANGUAGE="en",
+            DEFAULT_CURRENCY_SYMBOL="RUB",
+        )
+        subscription_service = SimpleNamespace(
+            get_active_subscription_details=AsyncMock(
+                return_value={
+                    "max_devices": 4,
+                    "extra_hwid_devices": 1,
+                    "extra_hwid_devices_valid_until": active_until,
+                    "device_topup_renewal_available": True,
+                }
+            ),
+            quote_hwid_device_topup=AsyncMock(
+                return_value={
+                    "price": 50,
+                    "valid_from": valid_from,
+                    "valid_until": active_until,
+                    "proration_ratio": 0.5,
+                }
+            ),
+        )
+        request = SimpleNamespace(
+            app={
+                "settings": settings,
+                "async_session_factory": _SessionFactory(),
+                "subscription_service": subscription_service,
+            }
+        )
+        db_user = SimpleNamespace(
+            is_banned=False,
+            panel_user_uuid="panel-user",
+            language_code="en",
+        )
+        sub = SimpleNamespace(
+            tariff_key="standard",
+            extra_hwid_devices=1,
+        )
+
+        with (
+            patch.object(billing_module, "_require_user_id", return_value=42),
+            patch.object(
+                billing_module.user_dal,
+                "get_user_by_id",
+                AsyncMock(return_value=db_user),
+            ),
+            patch.object(
+                billing_module.subscription_dal,
+                "get_active_subscription_by_user_id",
+                AsyncMock(return_value=sub),
+            ),
+        ):
+            response = await billing_module.device_topup_options_route(request)
+
+        self.assertEqual(response.status, 200)
+        payload = json.loads(response.text)
+        self.assertEqual(payload["extra_hwid_devices_valid_until"], active_until.isoformat())
+        self.assertEqual(payload["extra_hwid_devices_valid_until_text"], "02.01.2099 03:04")
+        self.assertEqual(payload["plans"][0]["valid_from"], valid_from.isoformat())
+        self.assertEqual(payload["plans"][0]["valid_until"], active_until.isoformat())