feat: implement web session handling and enhance token management

src/handlers/identity.ts

@@ -18,6 +18,7 @@ import {
 const TWO_FACTOR_REMEMBER_TTL_MS = 30 * 24 * 60 * 60 * 1000;
 const TWO_FACTOR_PROVIDER_AUTHENTICATOR = 0;
 const TWO_FACTOR_PROVIDER_REMEMBER = 5;
+const WEB_REFRESH_COOKIE = 'nodewarden_web_refresh';
 // Android client (2026.2.x) deserializes TwoFactorProviders2 keys with -1 for recovery code.
 // Keep request parsing backward-compatible with historical provider values (8 / 100).
 const TWO_FACTOR_PROVIDER_RECOVERY_CODE_RESPONSE = '-1';
@@ -31,6 +32,54 @@ function resolveTotpSecret(userSecret: string | null): string | null {
   return null;
 }
 
+function shouldUseWebSession(request: Request): boolean {
+  return String(request.headers.get('X-NodeWarden-Web-Session') || '').trim() === '1';
+}
+
+function parseCookieValue(request: Request, name: string): string | null {
+  const rawCookie = String(request.headers.get('Cookie') || '').trim();
+  if (!rawCookie) return null;
+  for (const part of rawCookie.split(';')) {
+    const [key, ...rest] = part.trim().split('=');
+    if (key !== name) continue;
+    const value = rest.join('=').trim();
+    return value ? decodeURIComponent(value) : null;
+  }
+  return null;
+}
+
+function buildRefreshCookie(request: Request, refreshToken: string, maxAgeSeconds: number): string {
+  const isHttps = new URL(request.url).protocol === 'https:';
+  const parts = [
+    `${WEB_REFRESH_COOKIE}=${encodeURIComponent(refreshToken)}`,
+    'Path=/identity/connect',
+    'HttpOnly',
+    'SameSite=Strict',
+    `Max-Age=${Math.max(0, Math.floor(maxAgeSeconds))}`,
+  ];
+  if (isHttps) parts.push('Secure');
+  return parts.join('; ');
+}
+
+function buildClearedRefreshCookie(request: Request): string {
+  return buildRefreshCookie(request, '', 0);
+}
+
+function withWebRefreshCookie(request: Request, response: Response, refreshToken: string | null): Response {
+  const headers = new Headers(response.headers);
+  headers.append(
+    'Set-Cookie',
+    refreshToken
+      ? buildRefreshCookie(request, refreshToken, Math.floor(LIMITS.auth.refreshTokenTtlMs / 1000))
+      : buildClearedRefreshCookie(request)
+  );
+  return new Response(response.body, {
+    status: response.status,
+    statusText: response.statusText,
+    headers,
+  });
+}
+
 function buildPreloginResponse(
   email: string,
   kdfType: number,
@@ -283,7 +332,7 @@ export async function handleToken(request: Request, env: Env): Promise<Response>
       access_token: accessToken,
       expires_in: LIMITS.auth.accessTokenTtlSeconds,
       token_type: 'Bearer',
-      refresh_token: refreshToken,
+      ...(shouldUseWebSession(request) ? { web_session: true } : { refresh_token: refreshToken }),
       ...(trustedTwoFactorTokenToReturn ? { TwoFactorToken: trustedTwoFactorTokenToReturn } : {}),
       Key: user.key,
       PrivateKey: user.privateKey,
@@ -305,7 +354,10 @@ export async function handleToken(request: Request, env: Env): Promise<Response>
       userDecryptionOptions: buildUserDecryptionOptions(user),
     };
 
-    return jsonResponse(response);
+    const baseResponse = jsonResponse(response);
+    return shouldUseWebSession(request)
+      ? withWebRefreshCookie(request, baseResponse, refreshToken)
+      : baseResponse;
 
   } else if (grantType === 'send_access') {
     const sendAccessLimit = await rateLimit.consumeBudget(`${clientIdentifier}:public`, LIMITS.rateLimit.publicRequestsPerMinute);
@@ -371,14 +423,21 @@ export async function handleToken(request: Request, env: Env): Promise<Response>
     }
 
     // Refresh token
-    const refreshToken = body.refresh_token;
+    const refreshToken = String(body.refresh_token || '').trim() || (
+      shouldUseWebSession(request)
+        ? parseCookieValue(request, WEB_REFRESH_COOKIE)
+        : null
+    );
     if (!refreshToken) {
       return identityErrorResponse('Refresh token is required', 'invalid_request', 400);
     }
 
     const result = await auth.refreshAccessToken(refreshToken);
     if (!result) {
-      return identityErrorResponse('Invalid refresh token', 'invalid_grant', 400);
+      const invalidResponse = identityErrorResponse('Invalid refresh token', 'invalid_grant', 400);
+      return shouldUseWebSession(request)
+        ? withWebRefreshCookie(request, invalidResponse, null)
+        : invalidResponse;
     }
 
     // Keep a short overlap window for old refresh token to absorb
@@ -395,7 +454,7 @@ export async function handleToken(request: Request, env: Env): Promise<Response>
       access_token: accessToken,
       expires_in: LIMITS.auth.accessTokenTtlSeconds,
       token_type: 'Bearer',
-      refresh_token: newRefreshToken,
+      ...(shouldUseWebSession(request) ? { web_session: true } : { refresh_token: newRefreshToken }),
       Key: user.key,
       PrivateKey: user.privateKey,
       AccountKeys: buildAccountKeys(user),
@@ -416,7 +475,10 @@ export async function handleToken(request: Request, env: Env): Promise<Response>
       userDecryptionOptions: buildUserDecryptionOptions(user),
     };
 
-    return jsonResponse(response);
+    const baseResponse = jsonResponse(response);
+    return shouldUseWebSession(request)
+      ? withWebRefreshCookie(request, baseResponse, newRefreshToken)
+      : baseResponse;
   }
 
   return identityErrorResponse('Unsupported grant type', 'unsupported_grant_type', 400);
@@ -470,10 +532,17 @@ export async function handleRevocation(request: Request, env: Env): Promise<Resp
     return new Response(null, { status: 200 });
   }
 
-  const token = String(body.token || '').trim();
+  const token = String(body.token || '').trim() || (
+    shouldUseWebSession(request)
+      ? (parseCookieValue(request, WEB_REFRESH_COOKIE) || '')
+      : ''
+  );
   if (token) {
     await storage.deleteRefreshToken(token);
   }
 
-  return new Response(null, { status: 200 });
+  const baseResponse = new Response(null, { status: 200 });
+  return shouldUseWebSession(request)
+    ? withWebRefreshCookie(request, baseResponse, null)
+    : baseResponse;
 }

src/types/index.ts

@@ -346,7 +346,8 @@ export interface TokenResponse {
   access_token: string;
   expires_in: number;
   token_type: string;
-  refresh_token: string;
+  refresh_token?: string;
+  web_session?: boolean;
   TwoFactorToken?: string;
   Key: string;
   PrivateKey: string | null;

src/utils/response.ts

@@ -15,12 +15,42 @@ const DEFAULT_CORS_HEADERS = [
   'X-Request-Email',
   'X-Device-Identifier',
   'X-Device-Name',
+  'X-NodeWarden-Web-Session',
 ];
 
-function getAllowedOrigin(request: Request): string | null {
+function isExtensionOrigin(origin: string): boolean {
+  return (
+    origin.startsWith('chrome-extension://')
+    || origin.startsWith('moz-extension://')
+    || origin.startsWith('safari-web-extension://')
+  );
+}
+
+function isWildcardCorsPath(path: string): boolean {
+  return (
+    path.startsWith('/icons/')
+    || path === '/config'
+    || path === '/api/config'
+    || path === '/api/version'
+  );
+}
+
+function getCorsPolicy(request: Request): { allowOrigin: string | null; allowCredentials: boolean } {
+  const url = new URL(request.url);
   const origin = request.headers.get('Origin');
-  if (!origin) return '*';
-  return origin;
+  if (isWildcardCorsPath(url.pathname)) {
+    return { allowOrigin: '*', allowCredentials: false };
+  }
+  if (!origin) {
+    return { allowOrigin: null, allowCredentials: false };
+  }
+  if (origin === url.origin) {
+    return { allowOrigin: origin, allowCredentials: true };
+  }
+  if (isExtensionOrigin(origin)) {
+    return { allowOrigin: origin, allowCredentials: false };
+  }
+  return { allowOrigin: null, allowCredentials: false };
 }
 
 function buildCorsHeaders(request: Request): Record<string, string> {
@@ -35,13 +65,14 @@ function buildCorsHeaders(request: Request): Record<string, string> {
     'Access-Control-Allow-Headers': allowHeaders.join(', '),
     'Access-Control-Expose-Headers': '*',
     'Access-Control-Max-Age': String(LIMITS.cors.preflightMaxAgeSeconds),
-    'Access-Control-Allow-Private-Network': 'true',
   };
 
-  const allowedOrigin = getAllowedOrigin(request);
-  if (allowedOrigin) {
-    headers['Access-Control-Allow-Origin'] = allowedOrigin;
+  const corsPolicy = getCorsPolicy(request);
+  if (corsPolicy.allowOrigin) {
+    headers['Access-Control-Allow-Origin'] = corsPolicy.allowOrigin;
+    if (corsPolicy.allowCredentials) {
       headers['Access-Control-Allow-Credentials'] = 'true';
+    }
     headers['Vary'] = 'Origin, Access-Control-Request-Headers';
   }
 

webapp/src/App.tsx

@@ -10,8 +10,12 @@ import JwtWarningPage from '@/components/JwtWarningPage';
 import {
   createAuthedFetch,
   getAuthorizedDevices,
+  clearProfileSnapshot,
   getCurrentDeviceIdentifier,
   getPasswordHint,
+  loadProfileSnapshot,
+  saveProfileSnapshot,
+  revokeCurrentSession,
   getTotpStatus,
   saveSession,
 } from '@/lib/api/auth';
@@ -39,6 +43,7 @@ import {
   performRecoverTwoFactorLogin,
   performRegistration,
   performTotpLogin,
+  hydrateLockedSession,
   performUnlock,
   type JwtUnsafeReason,
   type PendingTotp,
@@ -135,11 +140,12 @@ function resolveSystemTheme(): 'light' | 'dark' {
 export default function App() {
   const initialBootstrap = useMemo(() => readInitialAppBootstrapState(), []);
   const initialInviteCode = useMemo(() => readInviteCodeFromUrl(), []);
+  const initialProfileSnapshot = useMemo(() => loadProfileSnapshot(initialBootstrap.session?.email), [initialBootstrap]);
   const [pendingAuthAction, setPendingAuthAction] = useState<'login' | 'register' | 'unlock' | null>(null);
   const [location, navigate] = useLocation();
   const [phase, setPhase] = useState<AppPhase>(initialBootstrap.phase);
   const [session, setSessionState] = useState<SessionState | null>(initialBootstrap.session);
-  const [profile, setProfile] = useState<Profile | null>(null);
+  const [profile, setProfile] = useState<Profile | null>(initialProfileSnapshot);
   const [defaultKdfIterations, setDefaultKdfIterations] = useState(initialBootstrap.defaultKdfIterations);
   const [jwtWarning, setJwtWarning] = useState<{ reason: JwtUnsafeReason; minLength: number } | null>(initialBootstrap.jwtWarning);
 
@@ -172,6 +178,7 @@ export default function App() {
   const [recoverValues, setRecoverValues] = useState({ email: '', password: '', recoveryCode: '' });
   const [themePreference, setThemePreference] = useState<ThemePreference>(() => readThemePreference());
   const [systemTheme, setSystemTheme] = useState<'light' | 'dark'>(() => resolveSystemTheme());
+  const [unlockPreparing, setUnlockPreparing] = useState(() => initialBootstrap.phase === 'locked' && !initialProfileSnapshot?.key);
 
   const [confirm, setConfirm] = useState<AppConfirmState | null>(null);
   const [mobileLayout, setMobileLayout] = useState(false);
@@ -273,6 +280,16 @@ export default function App() {
     window.localStorage.setItem(THEME_STORAGE_KEY, themePreference);
   }, [themePreference]);
 
+  useEffect(() => {
+    saveProfileSnapshot(profile);
+  }, [profile]);
+
+  useEffect(() => {
+    if (phase === 'locked' && profile?.key && session) {
+      setUnlockPreparing(false);
+    }
+  }, [phase, profile, session]);
+
   useEffect(() => installMagneticUiFeedback(), []);
 
   function handleToggleTheme() {
@@ -334,6 +351,7 @@ export default function App() {
       setSession(boot.session);
       setProfile(boot.profile);
       setPhase(boot.phase);
+      setUnlockPreparing(boot.phase === 'locked' && !boot.profile?.key);
     })();
 
     return () => {
@@ -341,9 +359,34 @@ export default function App() {
     };
   }, [initialBootstrap]);
 
+  useEffect(() => {
+    if (phase !== 'locked' || !session) return;
+    let cancelled = false;
+    void (async () => {
+      const result = await hydrateLockedSession(session, profile);
+      if (cancelled) return;
+      if (!result.session) {
+        setSession(null);
+        setProfile(null);
+        setUnlockPreparing(false);
+        setPhase('login');
+        if (location !== '/login') navigate('/login');
+        return;
+      }
+      setSession(result.session);
+      if (result.profile) {
+        setProfile(result.profile);
+      }
+    })();
+    return () => {
+      cancelled = true;
+    };
+  }, [phase, session?.email, location, navigate]);
+
   async function finalizeLogin(login: CompletedLogin) {
     setSession(login.session);
     setProfile(login.profile);
+    setUnlockPreparing(false);
     setPendingTotp(null);
     setTotpCode('');
     setPhase('app');
@@ -528,6 +571,7 @@ export default function App() {
       const nextSession = await performUnlock(session, profile, unlockPassword, defaultKdfIterations);
       setSession(nextSession);
       setUnlockPassword('');
+      setUnlockPreparing(false);
       setPhase('app');
       if (location === '/' || location === '/lock') navigate('/vault');
       pushToast('success', t('txt_unlocked'));
@@ -544,14 +588,18 @@ export default function App() {
     delete nextSession.symEncKey;
     delete nextSession.symMacKey;
     setSession(nextSession);
+    setUnlockPreparing(false);
     setPhase('locked');
     navigate('/lock');
   }
 
   function logoutNow() {
+    void revokeCurrentSession(sessionRef.current);
     setConfirm(null);
     setSession(null);
+    clearProfileSnapshot();
     setProfile(null);
+    setUnlockPreparing(false);
     setPendingTotp(null);
     setPhase('login');
     navigate('/login');
@@ -882,9 +930,11 @@ export default function App() {
 
     const connect = () => {
       if (disposed) return;
+      const accessToken = session.accessToken;
+      if (!accessToken) return;
       try {
         const hubUrl = new URL('/notifications/hub', window.location.origin);
-        hubUrl.searchParams.set('access_token', session.accessToken);
+        hubUrl.searchParams.set('access_token', accessToken);
         hubUrl.protocol = hubUrl.protocol === 'https:' ? 'wss:' : 'ws:';
         socket = new WebSocket(hubUrl.toString());
       } catch {
@@ -1198,7 +1248,8 @@ export default function App() {
         <AuthViews
           mode={phase}
           pendingAction={pendingAuthAction}
-          unlockReady={!!profile}
+          unlockReady={!!profile?.key && !!session}
+          unlockPreparing={unlockPreparing}
           loginValues={loginValues}
           registerValues={registerValues}
           unlockPassword={unlockPassword}

webapp/src/components/AuthViews.tsx

@@ -21,6 +21,7 @@ interface AuthViewsProps {
   mode: 'login' | 'register' | 'locked';
   pendingAction: 'login' | 'register' | 'unlock' | null;
   unlockReady: boolean;
+  unlockPreparing: boolean;
   loginValues: LoginValues;
   registerValues: RegisterValues;
   unlockPassword: string;
@@ -97,14 +98,17 @@ export default function AuthViews(props: AuthViewsProps) {
                 type="button"
                 className="auth-link-btn"
                 onClick={props.onShowLockedPasswordHint}
-                disabled={unlockBusy}
+                disabled={unlockBusy || props.unlockPreparing}
               >
                 {t('txt_show_password_hint')}
               </button>
             </div>
-            <button type="submit" className="btn btn-primary full" disabled={unlockBusy || !props.unlockReady}>
+            {props.unlockPreparing ? (
+              <p className="muted standalone-muted">{t('txt_loading')}</p>
+            ) : null}
+            <button type="submit" className="btn btn-primary full" disabled={unlockBusy || props.unlockPreparing || !props.unlockReady}>
               <Unlock size={16} className="btn-icon" />
-              {unlockBusy ? t('txt_unlocking') : t('txt_unlock')}
+              {unlockBusy ? t('txt_unlocking') : props.unlockPreparing ? t('txt_loading') : t('txt_unlock')}
             </button>
             <div className="or">{t('txt_or')}</div>
             <button type="button" className="btn btn-secondary full" onClick={props.onLogout} disabled={unlockBusy}>

webapp/src/lib/api/auth.ts

@@ -10,8 +10,10 @@ import type {
 import { parseJson, type AuthedFetch, type SessionSetter } from './shared';
 
 const SESSION_KEY = 'nodewarden.web.session.v4';
+const PROFILE_SNAPSHOT_KEY = 'nodewarden.web.profile-snapshot.v1';
 const DEVICE_IDENTIFIER_KEY = 'nodewarden.web.device.identifier.v1';
 const TOTP_REMEMBER_TOKEN_KEY = 'nodewarden.web.totp.remember-token.v1';
+const WEB_SESSION_HEADER = 'X-NodeWarden-Web-Session';
 
 export interface PreloginResult {
   hash: string;
@@ -26,6 +28,24 @@ export interface PreloginKdfConfig {
   kdfParallelism: number | null;
 }
 
+interface PersistedSessionState {
+  email: string;
+  authMode: 'token' | 'web-cookie';
+}
+
+interface RefreshFailure {
+  ok: false;
+  transient: boolean;
+  error: string;
+}
+
+interface RefreshSuccess {
+  ok: true;
+  token: TokenSuccess;
+}
+
+type RefreshResult = RefreshFailure | RefreshSuccess;
+
 function randomHex(length: number): string {
   const bytes = crypto.getRandomValues(new Uint8Array(Math.max(1, Math.ceil(length / 2))));
   return Array.from(bytes).map((b) => b.toString(16).padStart(2, '0')).join('').slice(0, length);
@@ -66,12 +86,19 @@ export function loadSession(): SessionState | null {
   try {
     const raw = localStorage.getItem(SESSION_KEY);
     if (!raw) return null;
-    const parsed = JSON.parse(raw) as SessionState;
-    if (!parsed.accessToken || !parsed.refreshToken) return null;
+    const parsed = JSON.parse(raw) as Partial<SessionState> & Partial<PersistedSessionState>;
+    if (parsed.authMode === 'web-cookie' && parsed.email) {
+      return {
+        email: parsed.email,
+        authMode: 'web-cookie',
+      };
+    }
+    if (!parsed.accessToken || !parsed.refreshToken || !parsed.email) return null;
     return {
       accessToken: parsed.accessToken,
       refreshToken: parsed.refreshToken,
       email: parsed.email,
+      authMode: 'token',
     };
   } catch {
     return null;
@@ -83,14 +110,35 @@ export function saveSession(session: SessionState | null): void {
     localStorage.removeItem(SESSION_KEY);
     return;
   }
-  const persisted: SessionState = {
-    accessToken: session.accessToken,
-    refreshToken: session.refreshToken,
+  const persisted: PersistedSessionState = {
     email: session.email,
+    authMode: session.authMode === 'token' ? 'token' : 'web-cookie',
   };
   localStorage.setItem(SESSION_KEY, JSON.stringify(persisted));
 }
 
+export function loadProfileSnapshot(email?: string | null): Profile | null {
+  try {
+    const raw = localStorage.getItem(PROFILE_SNAPSHOT_KEY);
+    if (!raw) return null;
+    const parsed = JSON.parse(raw) as Profile;
+    if (!parsed?.email || !parsed?.key) return null;
+    if (email && parsed.email !== email) return null;
+    return parsed;
+  } catch {
+    return null;
+  }
+}
+
+export function saveProfileSnapshot(profile: Profile | null): void {
+  if (!profile) return;
+  localStorage.setItem(PROFILE_SNAPSHOT_KEY, JSON.stringify(profile));
+}
+
+export function clearProfileSnapshot(): void {
+  localStorage.removeItem(PROFILE_SNAPSHOT_KEY);
+}
+
 export function getCurrentDeviceIdentifier(): string {
   return (localStorage.getItem(DEVICE_IDENTIFIER_KEY) || '').trim();
 }
@@ -170,7 +218,10 @@ export async function loginWithPassword(
   }
   const resp = await fetch('/identity/connect/token', {
     method: 'POST',
-    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+    headers: {
+      'Content-Type': 'application/x-www-form-urlencoded',
+      [WEB_SESSION_HEADER]: '1',
+    },
     body: body.toString(),
   });
   const json = (await parseJson<TokenSuccess & TokenError>(resp)) || {};
@@ -183,18 +234,60 @@ export async function loginWithPassword(
   return json;
 }
 
-export async function refreshAccessToken(refreshToken: string): Promise<TokenSuccess | null> {
+function isTransientRefreshStatus(status: number): boolean {
+  return status === 0 || status === 429 || status >= 500;
+}
+
+export async function refreshAccessToken(session: SessionState): Promise<RefreshResult> {
   const body = new URLSearchParams();
   body.set('grant_type', 'refresh_token');
-  body.set('refresh_token', refreshToken);
+  if (session.authMode !== 'web-cookie' && session.refreshToken) {
+    body.set('refresh_token', session.refreshToken);
+  }
+  try {
     const resp = await fetch('/identity/connect/token', {
       method: 'POST',
-    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
+      headers: {
+        'Content-Type': 'application/x-www-form-urlencoded',
+        ...(session.authMode === 'web-cookie' ? { [WEB_SESSION_HEADER]: '1' } : {}),
+      },
       body: body.toString(),
     });
-  if (!resp.ok) return null;
+    if (!resp.ok) {
+      const json = await parseJson<TokenError>(resp);
+      return {
+        ok: false,
+        transient: isTransientRefreshStatus(resp.status),
+        error: json?.error_description || json?.error || 'Session refresh failed',
+      };
+    }
     const json = await parseJson<TokenSuccess>(resp);
-  return json || null;
+    if (!json?.access_token) {
+      return { ok: false, transient: false, error: 'Session refresh failed' };
+    }
+    return { ok: true, token: json };
+  } catch (error) {
+    return {
+      ok: false,
+      transient: true,
+      error: error instanceof Error ? error.message : 'Network error',
+    };
+  }
+}
+
+export async function revokeCurrentSession(session: SessionState | null): Promise<void> {
+  const body = new URLSearchParams();
+  if (session?.authMode !== 'web-cookie' && session?.refreshToken) {
+    body.set('token', session.refreshToken);
+  }
+  await fetch('/identity/connect/revocation', {
+    method: 'POST',
+    headers: {
+      'Content-Type': 'application/x-www-form-urlencoded',
+      ...(session?.authMode === 'web-cookie' ? { [WEB_SESSION_HEADER]: '1' } : {}),
+    },
+    body: body.toString(),
+  }).catch(() => undefined);
 }
 
 export async function registerAccount(args: {
@@ -279,18 +372,22 @@ export function createAuthedFetch(getSession: () => SessionState | null, setSess
     headers.set('Authorization', `Bearer ${session.accessToken}`);
 
     let resp = await fetch(input, { ...init, headers });
-    if (resp.status !== 401 || !session.refreshToken) return resp;
+    if (resp.status !== 401 || (!session.refreshToken && session.authMode !== 'web-cookie')) return resp;
 
-    const refreshed = await refreshAccessToken(session.refreshToken);
-    if (!refreshed?.access_token) {
+    const refreshed = await refreshAccessToken(session);
+    if (!refreshed.ok) {
+      if (refreshed.transient) {
+        throw new Error(refreshed.error || 'Session refresh temporarily unavailable');
+      }
       setSession(null);
       throw new Error('Session expired');
     }
 
     const nextSession: SessionState = {
       ...session,
-      accessToken: refreshed.access_token,
-      refreshToken: refreshed.refresh_token || session.refreshToken,
+      accessToken: refreshed.token.access_token,
+      refreshToken: refreshed.token.refresh_token || session.refreshToken,
+      authMode: refreshed.token.web_session ? 'web-cookie' : (session.authMode || 'token'),
     };
     setSession(nextSession);
     saveSession(nextSession);

webapp/src/lib/api/send.ts

@@ -152,6 +152,7 @@ export async function createSend(
   const uploadInfo = await parseJson<{ url?: string; sendResponse?: Send; fileUploadType?: number }>(fileResp);
   const uploadUrl = uploadInfo?.url;
   if (!uploadUrl) throw new Error('Create file send failed: missing upload URL');
+  if (!session.accessToken) throw new Error('Unauthorized');
   const payload = new ArrayBuffer(encryptedFileBytes.byteLength);
   new Uint8Array(payload).set(encryptedFileBytes);
   const uploadResp = await uploadDirectEncryptedPayload({

webapp/src/lib/api/vault.ts

@@ -240,6 +240,7 @@ export async function uploadCipherAttachment(
   const attachmentId = String(meta.attachmentId || '').trim();
   const uploadUrl = String(meta.url || '').trim();
   if (!attachmentId || !uploadUrl) throw new Error('Create attachment failed');
+  if (!session.accessToken) throw new Error('Unauthorized');
 
   const payload = new ArrayBuffer(encryptedBytes.byteLength);
   new Uint8Array(payload).set(encryptedBytes);

webapp/src/lib/app-auth.ts

@@ -2,6 +2,7 @@ import {
   createAuthedFetch,
   deriveLoginHashLocally,
   getProfile,
+  loadProfileSnapshot,
   loadSession,
   loginWithPassword,
   refreshAccessToken,
@@ -26,6 +27,7 @@ export interface BootstrapAppResult {
   session: SessionState | null;
   profile: Profile | null;
   phase: AppPhase;
+  needsBackgroundHydration?: boolean;
 }
 
 export interface InitialAppBootstrapState {
@@ -51,8 +53,9 @@ export interface RecoverTwoFactorResult {
   newRecoveryCode: string | null;
 }
 
-function decodeJwtExp(accessToken: string): number | null {
+function decodeJwtExp(accessToken: string | undefined): number | null {
   try {
+    if (!accessToken) return null;
     const parts = accessToken.split('.');
     if (parts.length < 2) return null;
     const payload = parts[1].replace(/-/g, '+').replace(/_/g, '/');
@@ -66,23 +69,24 @@ function decodeJwtExp(accessToken: string): number | null {
 }
 
 async function maybeRefreshSession(session: SessionState): Promise<SessionState | null> {
-  if (!session.refreshToken) return session;
+  if (!session.refreshToken && session.authMode !== 'web-cookie') return session.accessToken ? session : null;
   const exp = decodeJwtExp(session.accessToken);
   const nowSeconds = Math.floor(Date.now() / 1000);
 
-  if (exp !== null && exp - nowSeconds > 60) {
+  if (session.accessToken && exp !== null && exp - nowSeconds > 60) {
     return session;
   }
 
-  const refreshed = await refreshAccessToken(session.refreshToken);
-  if (!refreshed?.access_token) {
-    return exp !== null && exp > nowSeconds ? session : null;
+  const refreshed = await refreshAccessToken(session);
+  if (!refreshed.ok) {
+    return session.accessToken && exp !== null && exp > nowSeconds ? session : null;
   }
 
   return {
     ...session,
-    accessToken: refreshed.access_token,
-    refreshToken: refreshed.refresh_token || session.refreshToken,
+    accessToken: refreshed.token.access_token,
+    refreshToken: refreshed.token.refresh_token || session.refreshToken,
+    authMode: refreshed.token.web_session ? 'web-cookie' : (session.authMode || 'token'),
   };
 }
 
@@ -197,31 +201,51 @@ export async function bootstrapAppSession(initial: InitialAppBootstrapState = re
     };
   }
 
-  try {
-    const session = await maybeRefreshSession(loaded);
-    if (!session) {
-      throw new Error('Session expired');
+  const cachedProfile = loadProfileSnapshot(loaded.email);
+  if (cachedProfile) {
+    return {
+      defaultKdfIterations,
+      jwtWarning: null,
+      session: loaded,
+      profile: cachedProfile,
+      phase: 'locked',
+      needsBackgroundHydration: true,
+    };
   }
+
+  return {
+    defaultKdfIterations,
+    jwtWarning: null,
+    session: loaded,
+    profile: null,
+    phase: 'locked',
+    needsBackgroundHydration: true,
+  };
+}
+
+export async function hydrateLockedSession(
+  session: SessionState,
+  fallbackProfile: Profile | null = null
+): Promise<{ session: SessionState | null; profile: Profile | null }> {
+  const refreshedSession = await maybeRefreshSession(session);
+  if (!refreshedSession?.accessToken) {
+    return { session: null, profile: null };
+  }
+  try {
     const profile = await getProfile(
       createAuthedFetch(
-        () => session,
+        () => refreshedSession,
         () => {}
       )
     );
     return {
-      defaultKdfIterations,
-      jwtWarning: null,
-      session,
+      session: refreshedSession,
       profile,
-      phase: 'locked',
     };
   } catch {
     return {
-      defaultKdfIterations,
-      jwtWarning: null,
-      session: null,
-      profile: null,
-      phase: initial.phase === 'register' ? 'register' : 'login',
+      session: refreshedSession,
+      profile: fallbackProfile,
     };
   }
 }
@@ -236,6 +260,7 @@ export async function completeLogin(
     accessToken: token.access_token,
     refreshToken: token.refresh_token,
     email: normalizedEmail,
+    authMode: token.web_session ? 'web-cookie' : 'token',
   };
   const tempFetch = createAuthedFetch(
     () => baseSession,

webapp/src/lib/types.ts

@@ -1,9 +1,10 @@
 export type AppPhase = 'register' | 'login' | 'locked' | 'app';
 
 export interface SessionState {
-  accessToken: string;
-  refreshToken: string;
+  accessToken?: string;
+  refreshToken?: string;
   email: string;
+  authMode?: 'token' | 'web-cookie';
   symEncKey?: string;
   symMacKey?: string;
 }
@@ -265,7 +266,8 @@ export interface WebBootstrapResponse {
 
 export interface TokenSuccess {
   access_token: string;
-  refresh_token: string;
+  refresh_token?: string;
+  web_session?: boolean;
   expires_in?: number;
   token_type?: string;
   TwoFactorToken?: string;