CloudFlare Worker Google Workspace Redirects

worker.js

const redirectStatusCode = 302;
const workspaceDomain = "example.com";

export default {
  async fetch(request, env, ctx) {
    var host = request.headers.get("Host").toLowerCase();
    var prefix = host.split(".")[0];
    
    var redir_continue="";
    switch(prefix) {
      case "mail":
        redir_continue="mail.google.com";
        break;
      case "drive":
        redir_continue="drive.google.com";
        break;
      case "meet":
        redir_continue="meet.google.com";
        break;
      case "calendar":
        redir_continue="calendar.google.com";
        break;
      case "groups":
        redir_continue="groups.google.com";
        break;
      default:
        return new Response(`Unknown Prefix: ${prefix}`);
    }

    return Response.redirect(`https://www.google.com/a/${workspaceDomain}/ServiceLogin?continue=https://${redir_continue}`, redirectStatusCode);
    
  },
};