server.js

const path = require('path')
const fp = require('fastify-plugin')
const autoLoad = require('@fastify/autoload')
const cors = require('@fastify/cors')

/**
 * Configure and starts Fastify server with all required plugins and routes
 * @async
 * @param {Fastify.Server} server - Fastify server instance
 * @param {Object} config - optional configuration options (default to ./config module)
 *                          May contain a key per plugin (key is plugin name), and an extra
 *                          'fastify' key containing the server configuration object
 * @returns {Fastify.Server} started Fastify server instance
 */

async function plugin (server, config) {
  server
    .register(cors, {})
    .register(autoLoad, {
      dir: path.join(__dirname, 'plugins'),
      options: config
    })
    .register(autoLoad, {
      dir: path.join(__dirname, 'services'),
      options: config
    })
    .register(autoLoad, {
      dir: path.join(__dirname, 'routes'),
      options: config,
      dirNameRoutePrefix: false
    })

  server.setErrorHandler((err, req, res) => {
    req.log.error({ req, res, err }, err && err.message)
    err.message = 'An error has occurred'
    res.send(err)
  })

  // Trick to handle empty body on POST
  // because POST {{APIURL}}/articles/{{slug}}/favorite will be done without a body
  server.addHook('onRequest', async (req, res) => {
    if (req.headers['content-type'] === 'application/json' && req.headers['content-length'] === '0') {
      req.headers['content-type'] = 'empty'
    }
  })
  server.addContentTypeParser('empty', (request, body, done) => {
    done(null, {})
  })
}

module.exports = fp(plugin)