feat: show session timeout modal and redirect on 401 responses

src/components/auth/SessionTimeoutModal.tsx

@@ -1,4 +1,4 @@
-import { useEffect, useState, useCallback } from 'react';
+import { useEffect, useState, useCallback, useRef } from 'react';
 import { useNavigate } from 'react-router-dom';
 import {
   Dialog,
@@ -10,23 +10,51 @@ import {
 import { Button } from '@/components/ui/button';
 import { tokenManager } from '@/lib/api';
 
+const AUTO_REDIRECT_SECONDS = 5;
+
 export default function SessionTimeoutModal() {
   const [open, setOpen] = useState(false);
+  const [secondsLeft, setSecondsLeft] = useState(AUTO_REDIRECT_SECONDS);
   const navigate = useNavigate();
+  const timerRef = useRef<ReturnType<typeof setInterval>>();
 
-  const handleOpenChange = useCallback((isOpen: boolean) => {
-    if (!isOpen) {
-      tokenManager.clearToken();
-      navigate('/login', { replace: true });
-    }
+  const redirectToLogin = useCallback(() => {
+    tokenManager.clearToken();
+    navigate('/login', { replace: true });
   }, [navigate]);
 
   useEffect(() => {
-    const onSessionExpired = () => setOpen(true);
+    const onSessionExpired = () => {
+      setOpen(true);
+      setSecondsLeft(AUTO_REDIRECT_SECONDS);
+    };
     window.addEventListener('session:expired', onSessionExpired);
     return () => window.removeEventListener('session:expired', onSessionExpired);
   }, []);
 
+  useEffect(() => {
+    if (open) {
+      timerRef.current = setInterval(() => {
+        setSecondsLeft((prev) => {
+          if (prev <= 1) {
+            clearInterval(timerRef.current);
+            redirectToLogin();
+            return 0;
+          }
+          return prev - 1;
+        });
+      }, 1000);
+    }
+    return () => clearInterval(timerRef.current);
+  }, [open, redirectToLogin]);
+
+  const handleOpenChange = useCallback((isOpen: boolean) => {
+    if (!isOpen) {
+      clearInterval(timerRef.current);
+      redirectToLogin();
+    }
+  }, [redirectToLogin]);
+
   return (
     <Dialog open={open} onOpenChange={handleOpenChange}>
       <DialogContent
@@ -39,8 +67,11 @@ export default function SessionTimeoutModal() {
             Your session has timed out. Please sign in again to continue.
           </DialogDescription>
         </DialogHeader>
-        <div className="flex justify-end">
-          <Button onClick={() => { tokenManager.clearToken(); navigate('/login', { replace: true }); }}>
+        <div className="flex items-center justify-between">
+          <p className="text-sm text-muted-foreground">
+            Redirecting in {secondsLeft}s...
+          </p>
+          <Button onClick={redirectToLogin}>
             Sign In
           </Button>
         </div>

src/lib/api.ts

@@ -421,27 +421,42 @@ async function request<T>(
     cache: 'no-store',
   });
 
+  // Handle HTTP 401 before parsing JSON — catches non-JSON responses and
+  // unknown body shapes that would otherwise bypass the session-expired logic
+  if (response.status === 401) {
+    let errorType = 'UNAUTHORIZED';
+    try {
+      const errBody = await response.json();
+      errorType = errBody.error?.type || 'UNAUTHORIZED';
+    } catch {
+      // Non-JSON body (HTML error page, plain text, etc.) — use default
+    }
+
+    if (clearTokenOn401 !== false) {
+      tokenManager.clearToken();
+      window.dispatchEvent(new CustomEvent('session:expired'));
+      if (import.meta.env.DEV) {
+        console.log(`[API] Token cleared on 401 (type: ${errorType}, endpoint: ${endpoint})`);
+      }
+    }
+    throw new ApiError('Unauthorized', 401, errorType, {});
+  }
+
   const json: ApiResponse<T> = await response.json();
 
   if (!json.success) {
     const errorType = json.error?.type || 'UNKNOWN_ERROR';
 
-    // Handle 401 token clearing based on configuration
+    // Handle 401 in JSON body (backstop for servers that return 200 with code:401)
     if (json.code === 401) {
-      const shouldClearToken =
-        clearTokenOn401 === true ||
-        (clearTokenOn401 === 'auto' && SESSION_INVALID_ERROR_TYPES.includes(errorType));
-
-      if (shouldClearToken) {
+      if (clearTokenOn401 !== false) {
         tokenManager.clearToken();
-        // Dispatch event so the UI can show a session timeout modal
         window.dispatchEvent(new CustomEvent('session:expired'));
         if (import.meta.env.DEV) {
           console.log(`[API] Token cleared on 401 (type: ${errorType}, endpoint: ${endpoint})`);
         }
-      } else if (import.meta.env.DEV) {
-        console.log(`[API] 401 received but token preserved (type: ${errorType}, endpoint: ${endpoint})`);
       }
+      throw new ApiError(json.message || 'Unauthorized', 401, errorType, json.error?.details || {});
     }
 
     // Handle 403 authorization errors
@@ -772,6 +787,11 @@ export const api = {
       const res = await fetch(`${config.api.baseUrl}/superadmin/users/${userId}/audit-logs/export${qs}`, {
         headers: { 'Authorization': `Bearer ${token}` },
       });
+      if (res.status === 401) {
+        tokenManager.clearToken();
+        window.dispatchEvent(new CustomEvent('session:expired'));
+        throw new ApiError('Unauthorized', 401, 'UNAUTHORIZED');
+      }
       if (!res.ok) throw new ApiError('Export failed', res.status, 'EXPORT_ERROR');
       const blob = await res.blob();
       const url = URL.createObjectURL(blob);
@@ -865,6 +885,11 @@ export const api = {
         },
       });
       if (!response.ok) {
+        if (response.status === 401) {
+          tokenManager.clearToken();
+          window.dispatchEvent(new CustomEvent('session:expired'));
+          throw new ApiError('Unauthorized', 401, 'UNAUTHORIZED');
+        }
         const error = await response.json();
         throw new ApiError(
           error.message || 'Failed to begin registration',
@@ -893,6 +918,11 @@ export const api = {
         body: JSON.stringify({ email }),
       });
       if (!response.ok) {
+        if (response.status === 401) {
+          tokenManager.clearToken();
+          window.dispatchEvent(new CustomEvent('session:expired'));
+          throw new ApiError('Unauthorized', 401, 'UNAUTHORIZED');
+        }
         const error = await response.json();
         throw new ApiError(
           error.message || 'No passkeys found for this account',
@@ -916,6 +946,12 @@ export const api = {
         body: JSON.stringify(assertion),
       });
       
+      if (response.status === 401) {
+        tokenManager.clearToken();
+        window.dispatchEvent(new CustomEvent('session:expired'));
+        throw new ApiError('Unauthorized', 401, 'UNAUTHORIZED');
+      }
+      
       const json: ApiResponse<WebAuthnLoginCompleteResponse> = await response.json();
       
       if (!json.success) {