API Key Proxy - approov proxy checking

modified fragment for index.js

// load and check approov token checking

const approov = require(`${__dirname}/approov`);

if (config.approov_header == null) {
  throw new Error(`approov_header not found; please set in ${__dirname}/config.js`);
}
const approovHdr = config.approov_header;

// preprocess all proxy requests

app.use((req, res, next) => {
  // check and delete approov token

  //log_req(req);

  var token = req.headers[approovHdr];
  delete req.headers[approovHdr];

  if (!approov.isValid(token)) {
    console.log(chalk.red('Unauthorized: invalid Approov token'));
    res.status(401).send('Unauthorized');
    return;
  }

  next();
});