feat: tune deeplink fallback page

tests/test_webapp_route_contract.py

@@ -1,5 +1,7 @@
 import asyncio
+import json
 import unittest
+from pathlib import Path
 from types import SimpleNamespace
 from unittest.mock import AsyncMock, patch
 
@@ -10,6 +12,8 @@ from bot.app.web import admin_api, subscription_webapp
 from bot.app.web.admin_api_impl import auth as admin_auth_routes
 from bot.app.web.webapp_auth import create_webapp_session_token
 
+REPO_ROOT = Path(__file__).resolve().parents[1]
+
 
 class _Request(dict):
     def __init__(self, *, path="/", app=None, headers=None, cookies=None):
@@ -31,6 +35,26 @@ class _AsyncSessionFactory:
         return False
 
 
+class _I18n:
+    locales_data = {
+        "en": {
+            "wa_app_launch_title": "Localized launch",
+            "wa_app_launch_opening_hint": "Localized opening hint",
+            "wa_app_launch_hint": "Localized manual hint",
+            "wa_app_launch_button": "Localized open",
+            "wa_app_launch_retry_button": "Localized retry",
+            "wa_app_launch_done_title": "Localized done",
+            "wa_app_launch_done_hint": "Localized done hint",
+            "wa_app_launch_close_button": "Localized close",
+            "wa_app_launch_unavailable_title": "Localized unavailable",
+            "wa_app_launch_unavailable_hint": "Localized unavailable hint",
+        }
+    }
+
+    def gettext(self, lang_code, key, **kwargs):
+        return self.locales_data.get(lang_code, {}).get(key, key)
+
+
 def _route_map(app: web.Application) -> dict[tuple[str, str], str]:
     return {
         (route.method, route.resource.canonical): route.handler.__name__
@@ -202,6 +226,7 @@ class WebAppRouteContractTests(unittest.TestCase):
                 "settings": SimpleNamespace(
                     WEBAPP_ENABLED=True,
                     WEBAPP_TITLE="/minishop",
+                    DEFAULT_LANGUAGE="en",
                 )
             }
         )
@@ -212,11 +237,53 @@ class WebAppRouteContractTests(unittest.TestCase):
         self.assertEqual(response.status, 200)
         self.assertEqual(response.headers["Cache-Control"], "no-store")
         self.assertIn('nonce="nonce-value"', response.text)
+        self.assertNotIn("__MESSAGES_JSON__", response.text)
         self.assertIn("window.location.hash", response.text)
         self.assertIn("URLSearchParams", response.text)
-        self.assertIn("The app link is unavailable.", response.text)
+        self.assertIn("Settings added", response.text)
+        self.assertIn("window.close()", response.text)
         self.assertIn(r"/^(?:javascript|data|vbscript|https?):/i", response.text)
 
+    def test_app_deeplink_gateway_uses_i18n_template(self):
+        request = _Request(
+            app={
+                "settings": SimpleNamespace(
+                    WEBAPP_ENABLED=True,
+                    WEBAPP_TITLE="/minishop",
+                    DEFAULT_LANGUAGE="en",
+                ),
+                "i18n": _I18n(),
+            }
+        )
+        request["csp_nonce"] = "nonce-value"
+
+        response = asyncio.run(subscription_webapp.app_deeplink_route(request))
+
+        self.assertEqual(response.status, 200)
+        self.assertIn("Localized launch", response.text)
+        self.assertIn("Localized done hint", response.text)
+        self.assertIn("<title>/minishop - Localized launch</title>", response.text)
+        self.assertTrue(
+            (REPO_ROOT / "backend/bot/app/web/templates/open_app_gateway.html").is_file()
+        )
+
+    def test_app_launch_i18n_keys_are_available_to_webapp_bootstrap(self):
+        required_keys = {
+            "wa_app_launch_title",
+            "wa_app_launch_opening_hint",
+            "wa_app_launch_hint",
+            "wa_app_launch_button",
+            "wa_app_launch_retry_button",
+            "wa_app_launch_done_title",
+            "wa_app_launch_done_hint",
+            "wa_app_launch_close_button",
+            "wa_app_launch_unavailable_title",
+            "wa_app_launch_unavailable_hint",
+        }
+        for locale in ("en", "ru"):
+            messages = json.loads((REPO_ROOT / f"locales/{locale}.json").read_text("utf-8"))
+            self.assertLessEqual(required_keys, set(messages))
+
 
 class AdminApiAuthContractTests(unittest.IsolatedAsyncioTestCase):
     def _settings(self):