pages/api/pusher/auth.js

auth.js

import {pusher} from '../../../../lib/pusher'

export default async function handler( req, res ) {
  // see https://pusher.com/docs/channels/server_api/authenticating-users
  const { socket_id, channel_name, username, userLocation } = req.body;

  // use JWTs here to authenticate users before continuing

  const randomString = Math.random().toString(36).slice(2);

  const presenceData = {
    user_id: randomString,
    user_info: {
      username: "@" + username,
      userLocation
    },
  };

  try {
    const auth = pusher.authenticate(socket_id, channel_name, presenceData);
    res.send(auth);    
  } catch (error) {
      console.error(error)
  }
  
}