427e7578-d7bf-49c8-aee9-2dd999e25316/server/middleware/uuid.ts

import { v4 as uuidv4 } from 'uuid';

export default defineEventHandler((event) => {
  // 1. Check if the cookie already exists
  const cookie = getCookie(event, 'user_guid');

  // 2. If it doesn't exist, generate and set it
  if (!cookie) {
    const newUuid = uuidv4();
    
    setCookie(event, 'user_guid', newUuid, {
      maxAge: 60 * 60 * 24 * 7, // 1 week
      path: '/',
      // httpOnly: true, // Set to true if you DON'T need to read it in Vue/JS
      sameSite: 'lax',
    });

    // 3. Inject it into the context so it's available 
    // to other server routes/plugins during this same request
    event.context.userGuid = newUuid;
  } else {
    event.context.userGuid = cookie;
  }
});