implementing Facebook Login Integration in React Native App - Access Token Expiry Handling
I'm writing unit tests and I'm writing unit tests and I'm currently integrating Facebook Login in my React Native app using the `react-native-fbsdk` library. I followed the official documentation, and the login flow works perfectly in the development environment. However, I've encountered a question with handling the access token expiry when the user tries to access a protected route after the token has expired. Here’s a snippet of my login function: ```javascript import { LoginManager, AccessToken } from 'react-native-fbsdk'; async function handleFacebookLogin() { const result = await LoginManager.logInWithPermissions(['public_profile', 'email']); if (result.isCancelled) { console.log('Login cancelled'); return; } const data = await AccessToken.getCurrentAccessToken(); if (data) { console.log('Access Token:', data.accessToken); // Store token in state or secure storage } } ``` After logging in, I store the token and use it to make API calls. However, I've noticed that when the token expires, my API calls return a `401 Unauthorized` behavior, but I want to capture when this happens and prompt the user to re-login. I attempted to handle this by checking the token expiry before making requests: ```javascript async function fetchData() { const token = await getStoredToken(); // Assume this retrieves the token if (!token || isTokenExpired(token)) { console.log('Token expired, prompting login.'); await handleFacebookLogin(); } // Proceed with API call } ``` The `isTokenExpired` function checks the expiry time, but I'm not sure how to get the expiry time of the token. I’ve searched through the Facebook Graph API documentation, but I couldn't find clear guidelines on how to handle this effectively. I also tried using the `fb.api` method to get user data to check if the token is still valid, but it returns a `(#200) Permissions behavior` when the token is expired. Any advice on how to properly handle the access token expiration and re-authentication flow in a React Native app would be greatly appreciated! Is there a recommended way to check if the token is still valid before making API requests? Any feedback is welcome! This is for a CLI tool running on Ubuntu 20.04. Am I missing something obvious?