Implementing Auto-Logout Functionality for Suspended Users in a React Native App with Node.js Backend and Socket.IO

To implement this functionality with Socket.IO in your React Native app, you can follow these steps:

1. Create a Socket.IO server in your Node.js backend that listens for events related to user suspension.

2. When an admin suspends a user from the admin panel, emit a Socket.IO event from the server to the client app that includes the user ID of the suspended user.

3. In the client-side code of your React Native app, you can add a Socket.IO listener that listens for the suspension event. When the event is received, check whether the user ID in the event matches the ID of the currently logged-in user. If it does, log out the user by clearing their authentication token.

Here is some sample code to help you get started:

Backend Socket.IO server code:

const io = require('socket.io')(server);

io.on('connection', (socket) => {
  // listen for suspension events
  socket.on('user-suspended', (userId) => {
    // emit suspension event to all connected clients
    io.emit('user-suspended', userId);
  });
});

Admin panel code to emit suspension event:

import io from 'socket.io-client';

const socket = io('http://localhost:3000');

function suspendUser(userId) {
  // suspend user in backend API
  socket.emit('user-suspended', userId);
}

Frontend code to listen for suspension event:

import io from 'socket.io-client';

const socket = io('http://localhost:3000');

function App() {
  const [loggedInUser, setLoggedInUser] = useState(null);

  useEffect(() => {
    // set up Socket.IO listener for suspension events
    socket.on('user-suspended', (suspendedUserId) => {
      if (loggedInUser && loggedInUser.id === suspendedUserId) {
        // clear user's authentication token to log them out
        localStorage.removeItem('authToken');
        setLoggedInUser(null);
      }
    });
  }, [loggedInUser]);

  // render app components and handle user authentication
}

Note that this is just a basic example, and you may need to modify the code to fit your specific use case. Also, make sure to secure your Socket.IO server and API endpoints to prevent unauthorized access.