synquery-redirect-service/start.js

synquery redirect talent

/**
 * [synquery.redirect] start.js
 * シンプルなリダイレクトサービスを提供する。
 */
(g=>{ // g === module.expots

  const argv = require('minimist')(process.argv.slice(2));
  // console.log('[synquery.redirect]', argv);
  // Configuration must be specified by a static json file
  // TODO this gateway will a temporary buffer for maintenance situation
  const Default = {
    Protocol: 'http',
    Port: 8080, // Assume that WELL-KNOWN PORT is supported by port-forwarding not to root execute for the redirect process
    // e.g.) ssh -L 0.0.0.0:80:127.0.0.1:8080 -i ${HOME}/.ssh/pf_rsa 0.0.0.0 -N or docker ports: 80:8080
    StatusCode: 307, // 301 Moved Permanently 307 Temporary Redirect 308 Permanent Redirect
    ResponseHeaders: { }
  };
  const config = {
    protocol: Default.Protocol,
    port: Default.Port,
    statusCode: Default.StatusCode,
    responseHeaders: Default.ResponseHeaders
  };
  try {
    const configPath = argv._[0];
    if(configPath) { Object.assign(config, require( configPath )); }
  } catch(e) {
    /*BASICALLY IGNORE*/
    // Notificate only when File Not Found or Could Not Parse
    console.log('[synquery.redirect][Warn]', e);
  }
  const ptcl = config.protocol.toLowerCase().replace(/\W/, '');
  require(ptcl).createServer(config.serverOptions || { }, (req, res) => {
    try {
      const requestedOrigin = req.headers['origin'] || [ ptcl + '://', req.headers.host ].join(''), redirectOrigin = requestedOrigin.replace(ptcl + ':', 'http' + (ptcl == 'http' ? 's': '') + ':');
      res.writeHead(config.statusCode, Object.assign(config.responseHeaders, {  // Moved Permanently
        'Location': [ redirectOrigin, req.url ].join('')
      }));
      res.end();
    } catch(e) {
      res.end(e ? e.message || e: 'redirect service error');
    }
  }).listen(config.port);
  console.log(`[synquery.redirect][Info] redirect service is working at port:${config.port}`);

})(this);