Getting redirect URL

index.js

const getUrlDomainPart = (url) => {
  const [part] = url.match(/^https?:\/\/[^\/]+\//) || [];

  return part;
};

export const getCurrentUrl = () => {
  const url = window.location.href;
  const part = getUrlDomainPart(url);

  return part ? url.substr(part.length - 1) : '';
};

export const isAcceptableUrl = (url) => {
  if (url.charAt() === '/') {
    return true;
  }

  const part = getUrlDomainPart(url);

  return Boolean(part && window.location.href.indexOf(part) === 0);
};