text: import dottie from 'dottie';
  import path from 'path';
  
  /**
   * Main handler for serving client views.
   *
   * @param {Object} ctx Server-side application context
   * @param {Object} req Express request object
   * @param {Object} res Express response object
   */
  function handler(ctx, req, res) {
    // If the client IP is blacklisted, we'll serve a dedicated page with no client-side logic for
    // accessing the login API endpoints.
    const ip = dottie.get(req, 'headers.x-forwarded-for') ||
      dottie.get(req, 'connection.remoteAddress');
    if (ctx.blacklist.isBlacklisted(ip)) {
      return res.render(path.resolve(__dirname, '../../client/templates/blacklist'));
    }
  
    return res.render(path.resolve(__dirname, '../../client/templates/index'));
  }
  
  export default handler;
  