Paste Service - Cloudflare Workers

const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
const url = 'https://cf-paste.walshy.dev/';

addEventListener('fetch', event => {
  try {
    event.respondWith(handleRequest(event.request))
  } catch (e) {
    return new Response(JSON.stringify(e), { 'Content-Type': 'application/json' });
  }
})

async function handleRequest(request) {
  const { pathname } = new URL(request.url);

  if (pathname === '' || pathname === '/') {
    return new Response('Send a POST to /documents in order to paste!');
  } else if (pathname === '/documents' && request.method === 'POST') {
    const content = await request.text();

    if (content.trim().length === 0) {
      return new Response('{"error": "Please provide a body!"}', { 'Content-Type': 'application/json' });
    }

    const id = getRandomString();

    await KV.put(id, content, { expirationTtl: 86400 });

    return new Response(JSON.stringify({
      key: id, url: url + id,
      note: 'It may take up to 60 seconds for the paste to become available!'
    }), { 'Content-Type': 'application/json'});
  } else {
    const data = await KV.get(pathname.substring(1));

    if (data === null) {
      return new Response('Not found!', { status: 404 });
    } else {
      return new Response(data);
    }
  }

  function getRandomString() {
    // Pick characers randomly
    let str = '';
    for (let i = 0; i < 12; i++) {
        str += chars.charAt(Math.floor(Math.random() * chars.length));
    }

    return str;
  }
}