const MODULE_NAME = 'APISERVER';
  
  const express = require('express');
  const config = require('komodo-sdk/config');
  const logger = require('komodo-sdk/logger');
  
  const validApikey = require('./valid-apikey');
  
  const middlewareCommon = require('../middlewares/common');
  const routerMatrix = require('./routers/matrix');
  
  const app = express();
  
  app.use((req, res, next) => {
      res.locals.httpgetx_subsystem = MODULE_NAME;
      next();
  });
  
  const apikeyChecker = (req, res, next) => {
      if (validApikey(req.params.apikey)) {
          next();
      } else {
          res.status(403).end('Invalid APIKEY');
      }
  };
  
  app.use(middlewareCommon);
  
  app.use('/apikey/:apikey', apikeyChecker);
  app.use('/apikey/:apikey/matrix', routerMatrix);
  
  app.use((req, res) => {
      const { xid } = res.locals;
      res.status(404).end(`KOMODO-HTTP-GET-X CENTER (APISERVER).
  404: Method not found.
  
  XID: ${xid}.
  `);
  });
  
  const listenPort = config.listener && config.listener.apiserver && config.listener.apiserver.port;
  if (
      listenPort
      && config.listener && config.listener.apiserver && config.listener.apiserver.apikey
  ) {
      app.listen(listenPort, () => {
          logger.info(`${MODULE_NAME} FAEE1E47: Listening`, { port: listenPort });
      });
  } else {
      logger.info(`${MODULE_NAME}: Disabled because of missing configuration`);
  }