Token Refresh Implementation

Overview

The API services now automatically handle token refresh when access tokens expire. This provides a seamless user experience without requiring manual re-authentication.

How It Works

1. userService.ts

The userService now includes:

refreshToken(): Automatically gets the refresh token from localStorage, calls the /api/user/refresh endpoint, and updates the access token
fetchWithAuth(): A wrapper around fetch() that:
1. Automatically adds the Authorization header with the access token
2. Detects 401 (Unauthorized) responses
3. Automatically refreshes the token using the refresh token
4. Retries the original request with the new access token
5. Throws an error if refresh fails (e.g., refresh token expired)

2. conversationService.ts

Now uses userService.fetchWithAuth() for all API calls:

sendQuery() - No longer needs token parameter
getMessages() - No longer needs token parameter

3. Components Updated

ChatScreen.tsx:

Removed manual token handling
Now simply calls conversationService.sendQuery(query) and conversationService.getMessages()

Benefits

✅ Automatic token refresh - Users stay logged in longer ✅ Transparent retry logic - Failed requests due to expired tokens are automatically retried ✅ Cleaner code - Components don't need to manage tokens ✅ Better UX - No interruptions when access token expires ✅ Centralized auth logic - All auth handling in one place

Error Handling

If refresh token is missing or invalid, the error is thrown
Components can catch these errors and redirect to login
LocalStorage is automatically cleared when refresh fails

Usage Example

// Old way (manual token management)
const token = localStorage.getItem("access_token");
const result = await conversationService.sendQuery(query, token);

// New way (automatic token refresh)
const result = await conversationService.sendQuery(query);

Token Storage

Access Token: localStorage.getItem("access_token")
Refresh Token: localStorage.getItem("refresh_token")

Both are automatically managed by the services.

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