fix: keep session when refresh fails on network error or 5xx (WealthLedger/frontend#97)

A backend outage during deploy cleared the session and sent the user
to login although the refresh cookie was still valid. Only a definitive
401 ends the session now; network errors and 5xx keep it and show a
retry screen.

.ai/conventions/data.md

@@ -40,6 +40,11 @@ Authorization. Auth endpoints исключены из Bearer/retry middleware. R
 координируется single-flight; после `401` с `UNAUTHORIZED` возможен один retry.
 Не добавляй собственный refresh/retry loop в caller.
 
+Refresh, завершившийся `401`, очищает session. Сетевая ошибка и `5xx`
+(например, деплой backend) не доказывают конец session: она сохраняется,
+`unavailable` показывает retry-экран вместо login, а следующий `401` снова
+запускает refresh. Retry/backoff внутри refresh не добавляется.
+
 Cookie-writing requests упорядочены только в текущей вкладке. Cross-tab auth
 synchronization не требуется; допустим reload/re-login. Web Locks и отдельные
 token stores не добавляются.

src/app/routes/AppRoutes/AppRoutes.test.tsx

@@ -190,6 +190,30 @@ describe("AppRoutes", () => {
 		expect(document.title).toBe("Карты — WealthLedger");
 	});
 
+	it("offers a retry instead of the login form while the server is unreachable, then restores the route", async () => {
+		let isOutage = true;
+		server.use(
+			http.post("*/api/v1/auth/refresh", () =>
+				isOutage
+					? new HttpResponse(null, { status: 502 })
+					: HttpResponse.json({
+							accessToken: "test-token",
+							user: { email: "user@example.com", id: "user-1" },
+						}),
+			),
+		);
+		renderRoutes("/accounts");
+
+		expect(await screen.findByRole("alert")).toHaveTextContent("Не удалось подключиться");
+		expect(screen.queryByRole("heading", { name: "Вход" })).not.toBeInTheDocument();
+		isOutage = false;
+		fireEvent.click(screen.getByRole("button", { name: "Повторить" }));
+
+		expect(
+			await screen.findByRole("heading", { level: 2, name: "Нет инвестиционных счетов" }),
+		).toBeVisible();
+	});
+
 	it("lazy-loads the protected shell for an authenticated accounts route", async () => {
 		server.use(
 			http.post("*/api/v1/auth/refresh", () =>

src/app/routes/RouteGuards.tsx

@@ -1,4 +1,7 @@
+import { Button, Container } from "@mantine/core";
+import { StateView } from "@wealthledger/ui";
 import { type FC, type PropsWithChildren, useState } from "react";
+import { useTranslation } from "react-i18next";
 import { Navigate, useLocation } from "react-router";
 
 import { useAuth } from "@/features/auth";
@@ -7,12 +10,26 @@ import { RouteSkeleton } from "./RouteFallback";
 
 const Protected: FC<PropsWithChildren> = (props) => {
 	const { children } = props;
-	const { ready, signedOut, user } = useAuth();
+	const { ready, retry, signedOut, unavailable, user } = useAuth();
+	const { t } = useTranslation();
 	const location = useLocation();
 	const [wasAuthenticated, setWasAuthenticated] = useState(false);
 	if (user && !wasAuthenticated) setWasAuthenticated(true);
 	if (!ready) return <RouteSkeleton variant="shell" />;
 
+	// The server was unreachable (e.g. mid-deploy), so the session is unproven, not gone.
+	if (!user && unavailable)
+		return (
+			<Container py="xl" size={560}>
+				<StateView
+					action={<Button onClick={retry}>{t("auth.retry")}</Button>}
+					error
+					text={t("auth.unavailableText")}
+					title={t("auth.unavailableTitle")}
+				/>
+			</Container>
+		);
+
 	const loginState = signedOut && wasAuthenticated
 		? undefined
 		: { returnTo: `${location.pathname}${location.search}` };

src/features/auth/model/auth-context.ts

@@ -7,7 +7,12 @@ type AuthContextValue = {
 	logout: () => Promise<void>;
 	ready: boolean;
 	register: (email: string, password: string) => Promise<void>;
+	retry: () => void;
 	signedOut: boolean;
+	/**
+	Refresh failed with a network error or 5xx; the refresh cookie may still be valid.
+	*/
+	unavailable: boolean;
 	user: undefined | User;
 };
 

src/features/auth/model/auth.test.tsx

@@ -92,8 +92,10 @@ describe("AuthProvider", () => {
 		);
 	});
 
-	it("settles unauthenticated and clears cached data when cold-start refresh has a transport error", async () => {
-		server.use(http.post("*/api/v1/auth/refresh", () => HttpResponse.error()));
+	it("settles unauthenticated and clears cached data when cold-start refresh is rejected with 401", async () => {
+		server.use(http.post("*/api/v1/auth/refresh", () =>
+			HttpResponse.json({ code: "UNAUTHORIZED" }, { status: 401 }),
+		));
 		const queryClient = createTestQueryClient();
 		queryClient.setQueryData(["cached-query"], { value: "stale" });
 		queryClient.setQueryData(bankCardsKey, [{ id: "bank-card-1" }]);
@@ -103,12 +105,54 @@ describe("AuthProvider", () => {
 		await waitFor(() => expect(result.current.ready).toBe(true));
 
 		expect(result.current.user).toBeUndefined();
+		expect(result.current.unavailable).toBe(false);
 		expect(await requestAuthorization()).toBeNull();
 		expect(queryClient.getQueryData(["cached-query"])).toBeUndefined();
 		expect(queryClient.getQueryData(bankCardsKey)).toBeUndefined();
 	});
 
-	it("keeps the original protected 401 when serialized refresh has a transport error", async () => {
+	it.each([
+		["a transport error", () => HttpResponse.error()],
+		["a 502 from the proxy", () => new HttpResponse(null, { status: 502 })],
+		["a 503 problem", () => HttpResponse.json({ code: "INTERNAL_SERVER_ERROR" }, { status: 503 })],
+	])("settles as unavailable and keeps cached data when cold-start refresh gets %s", async (_name, failure) => {
+		server.use(http.post("*/api/v1/auth/refresh", failure));
+		const queryClient = createTestQueryClient();
+		queryClient.setQueryData(["cached-query"], { value: "kept" });
+		const wrapper: FC<PropsWithChildren> = createAuthWrapper(queryClient);
+		const { result } = renderHook(() => useAuth(), { wrapper });
+
+		await waitFor(() => expect(result.current.ready).toBe(true));
+
+		expect(result.current.user).toBeUndefined();
+		expect(result.current.unavailable).toBe(true);
+		expect(queryClient.getQueryData(["cached-query"])).toEqual({ value: "kept" });
+	});
+
+	it("restores the session when retry succeeds after an outage", async () => {
+		let isOutage = true;
+		server.use(http.post("*/api/v1/auth/refresh", () =>
+			isOutage
+				? new HttpResponse(null, { status: 502 })
+				: HttpResponse.json({
+						accessToken: "restored-token",
+						user: { email: "user@example.com", id: "user-1" },
+					}),
+		));
+		const queryClient = createTestQueryClient();
+		const wrapper: FC<PropsWithChildren> = createAuthWrapper(queryClient);
+		const { result } = renderHook(() => useAuth(), { wrapper });
+
+		await waitFor(() => expect(result.current.unavailable).toBe(true));
+		isOutage = false;
+		act(() => result.current.retry());
+
+		await waitFor(() => expect(result.current.user?.id).toBe("user-1"));
+		expect(result.current.unavailable).toBe(false);
+		expect(await requestAuthorization()).toBe("Bearer restored-token");
+	});
+
+	it("keeps the original protected 401 and the session when serialized refresh has a transport error", async () => {
 		let refreshCalls = 0;
 		server.use(
 			http.post("*/api/v1/auth/refresh", () => {
@@ -137,10 +181,11 @@ describe("AuthProvider", () => {
 		const response = await apiClient.GET("/api/v1/brokerage-accounts");
 
 		expect(response.response.status).toBe(401);
-		await waitFor(() => expect(result.current.user).toBeUndefined());
-		expect(await requestAuthorization()).toBeNull();
-		expect(queryClient.getQueryData(["cached-query"])).toBeUndefined();
-		expect(queryClient.getQueryData(bankCardsKey)).toBeUndefined();
+		// An unreachable server does not prove the session ended; the next 401 refreshes again.
+		await waitFor(() => expect(result.current.unavailable).toBe(true));
+		expect(result.current.user?.id).toBe("user-1");
+		expect(queryClient.getQueryData(["cached-query"])).toEqual({ value: "stale" });
+		expect(queryClient.getQueryData(bankCardsKey)).toEqual([{ id: "bank-card-1" }]);
 	});
 
 	it("clears connection status and financial cache independently on logout", async () => {

src/features/auth/model/auth.vm.ts

@@ -5,6 +5,9 @@ import { apiClient, configureAuthClient, type paths } from "@/shared/api";
 
 import { type User } from "./auth-context";
 
+// A 5xx or network error means the server is unreachable, not that the session ended.
+const HTTP_SERVER_ERROR = 500;
+
 type Authentication
 	= paths["/api/v1/auth/login"]["post"]["responses"][200]["content"]["application/json"];
 
@@ -32,6 +35,8 @@ function useAuthProviderVm() {
 	const accessTokenRef = useRef<string | undefined>(undefined);
 	const [ready, setReady] = useState(false);
 	const [signedOut, setSignedOut] = useState(false);
+	const [unavailable, setUnavailable] = useState(false);
+	const unavailableRef = useRef(false);
 
 	const generationRef = useRef(0);
 	const userRef = useRef<undefined | User>(undefined);
@@ -49,12 +54,18 @@ function useAuthProviderVm() {
 		return next;
 	}, []);
 
+	const markUnavailable = useCallback((isUnavailable: boolean) => {
+		unavailableRef.current = isUnavailable;
+		setUnavailable(isUnavailable);
+	}, []);
+
 	const applyAuthentication = useCallback(
 		(authentication: Authentication) => {
 			const changedIdentity
 				= userRef.current && userRef.current.id !== authentication.user.id;
 
 			setSignedOut(false);
+			markUnavailable(false);
 			accessTokenRef.current = authentication.accessToken;
 
 			if (changedIdentity) {
@@ -67,16 +78,17 @@ function useAuthProviderVm() {
 			userRef.current = authentication.user;
 			setUser(authentication.user);
 		},
-		[queryClient],
+		[markUnavailable, queryClient],
 	);
 
 	const clearSession = useCallback(() => {
+		markUnavailable(false);
 		generationRef.current += 1;
 		userRef.current = undefined;
 		setUser(undefined);
 		accessTokenRef.current = undefined;
 		queryClient.clear();
-	}, [queryClient]);
+	}, [markUnavailable, queryClient]);
 
 	const refresh = useCallback((): Promise<boolean> => {
 		if (refreshPromiseRef.current) return refreshPromiseRef.current;
@@ -86,11 +98,12 @@ function useAuthProviderVm() {
 			if (started !== generationRef.current) return false;
 
 			try {
-				const { data } = await apiClient.POST("/api/v1/auth/refresh");
+				const { data, response } = await apiClient.POST("/api/v1/auth/refresh");
 				if (started !== generationRef.current) return false;
 
 				if (!data) {
-					clearSession();
+					if (response.status >= HTTP_SERVER_ERROR) markUnavailable(true);
+					else clearSession();
 
 					return false;
 				}
@@ -100,7 +113,7 @@ function useAuthProviderVm() {
 				return true;
 			}
 			catch {
-				if (started === generationRef.current) clearSession();
+				if (started === generationRef.current) markUnavailable(true);
 
 				return false;
 			}
@@ -112,7 +125,7 @@ function useAuthProviderVm() {
 		refreshPromiseRef.current = pending;
 
 		return pending;
-	}, [applyAuthentication, clearSession, serialize]);
+	}, [applyAuthentication, clearSession, markUnavailable, serialize]);
 
 	useEffect(() => {
 		void refresh().finally(() => setReady(true));
@@ -146,6 +159,7 @@ function useAuthProviderVm() {
 			clear: clearSession,
 			generation: () => generationRef.current,
 			refresh,
+			unavailable: () => unavailableRef.current,
 		});
 	});
 	useEffect(() => () => configureAuthClient(), []);
@@ -157,7 +171,9 @@ function useAuthProviderVm() {
 		ready,
 		register: (email: string, password: string) =>
 			authenticate("/api/v1/auth/register", email, password),
+		retry: () => void refresh(),
 		signedOut,
+		unavailable,
 		user,
 	};
 

src/shared/api/client.test.ts

@@ -67,6 +67,25 @@ describe("apiClient authentication", () => {
 		expect(clear).toHaveBeenCalledOnce();
 	});
 
+	it("keeps the session when refresh failed because the server was unreachable", async () => {
+		const clear = vi.fn();
+		server.use(
+			http.get("*/api/v1/brokerage-accounts", () =>
+				HttpResponse.json({ code: "UNAUTHORIZED" }, { status: 401 }),
+			),
+		);
+		configureAuthClient({
+			accessToken: () => "expired",
+			clear,
+			refresh: () => Promise.resolve(false),
+			unavailable: () => true,
+		});
+
+		await apiClient.GET("/api/v1/brokerage-accounts");
+
+		expect(clear).not.toHaveBeenCalled();
+	});
+
 	it("does not attach Bearer auth to authentication endpoints", async () => {
 		let authorization: null | string
 

src/shared/api/client.ts

@@ -32,6 +32,10 @@ type AuthHandlers = {
 	clear: () => void;
 	generation?: () => number;
 	refresh: () => Promise<boolean>;
+	/**
+	True after a refresh failed transiently (network/5xx): the session is not proven gone.
+	*/
+	unavailable?: () => boolean;
 };
 
 type ReadAttempt = {
@@ -100,7 +104,8 @@ async function authenticatedFetch(request: Request): Promise<Response> {
 	if (!isCurrent()) throw new DOMException("Session changed", "AbortError");
 
 	if (!(await sessionState.handlers.refresh())) {
-		if (isCurrent()) sessionState.handlers.clear();
+		if (isCurrent() && !sessionState.handlers.unavailable?.())
+			sessionState.handlers.clear();
 
 		return response;
 	}

src/shared/i18n/locales/ru.ts

@@ -53,6 +53,9 @@ const ru = {
 			passwordConfirmation: "Подтвердите пароль",
 			register: "Регистрация",
 			requestError: "Не удалось выполнить запрос. Попробуйте ещё раз.",
+			retry: "Повторить",
+			unavailableText: "Сервер временно недоступен. Ваш вход сохранён, попробуйте через минуту.",
+			unavailableTitle: "Не удалось подключиться",
 			validation: {
 				invalidEmail: "Некорректный email",
 				invalidPasswordLength: "Пароль: от 8 до 72 символов, только латинские буквы, цифры, спецсимволы и пробел",