store cookies in kv

Read cookies from a request and store in a KV

info

CF documentation: https://developers.cloudflare.com/workers/runtime-apis/kv/

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event))
})

/**
 * Respond to the request
 * @param {Request} request
 */
async function handleRequest(event) {
  const response = await fetch(event.request);
  event.waitUntil(logNewCookies(event.request, response));
  return response;
}

async function logNewCookies(thisrequest, thisresponse) {
  //get request cookies and log them
  console.log(thisrequest.url)
  const cookiestring = thisrequest.headers.get('cookie');
  //Check there are cookies present and log them if they are
  var cookies = {};
  if (cookiestring && cookiestring != '') {
    var split = cookiestring.split('; ')
    //loop through the cookie list
    for (var i = 0; i < split.length; i++) {
      var name_value = split[i].split("=");
      cookies[decodeURIComponent(name_value[0])] = decodeURIComponent(name_value[1]);
      //console.log('name:', )
      await addCookieIfNotLogged(name_value[0], thisrequest.url)
    }

  } else { console.log('no cookies with this request') }
}

async function addCookieIfNotLogged(cookieName, path) {
  console.log(cookieName + path)
  if (cookieName != undefined && path != undefined
    && !cookieName.includes(".AspNetCore.Antiforgery.")
    && !cookieName.includes(".AspNetCore.Correlation.")) {
    console.log(cookieName)
    var currentValue = await COOKIES.get(cookieName)
    console.log(currentValue)
    if (currentValue === null) {
      await COOKIES.put(cookieName, path)
    }
  }
}

note

Within the Worker > Settings > Variables a KV Namespace Binding called COOKIES will need to be created and bound.