xyz_root.js

// Set jsrender module for server-side templates.
const jsr = require('jsrender');

module.exports = {route, view};

function route(fastify) {

  fastify.route({
    method: 'GET',
    url: '/',
    preValidation: fastify.auth([
      (req, res, next) => fastify.authToken(req, res, next, {
        public: global.public,
        login: true
      })
    ]),
    handler: view
  });

  fastify.route({
    method: 'POST',
    url: '/',
    handler: (req, res) => fastify.login.post(req, res, {
      view: view
    })
  });

};

function view(req, res, token = { access: 'public' }) {

  // Build the template with jsrender and send to client.
  res
    .type('text/html')
    .send(
      jsr
        .templates('./public/views/desktop.html')
        .render({ token: token.signed || '""' })
    );
};