PTT over 18 cookie detection

ptt.over18.js

(() => {
  const set = new Set(['gossiping', 'sex']);

  const pathname = location.pathname;
  const tokens = pathname.split('/');

  if (tokens.length < 3) {
    return;
  }

  const kind = tokens[1];

  if (kind !== 'bbs' && kind !== 'man') {
    return;
  }

  const board = tokens[2].toLocaleLowerCase();

  if (set.has(board) === false) {
    return;
  }

  if (document.cookie.indexOf('over18=1') !== -1) {
    return;
  }

  location.replace('/ask/over18?from=' + encodeURIComponent(pathname));
})();