airpay-correlationid-middleware/index.js

correlationid middleware

const { v1: uuidV1 } = require('uuid');

const isValidUUID = (uuid) => {
  const expression = /^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$/;

  if (expression.test(uuid)) {
    return true;
  }

  return false;
};

const middleware = (req, res, next) => {
  const { headers: { 'x-coreplatform-correlationid': correlationid } } = req;

  if (correlationid && isValidUUID(correlationid)) {
    next();

    return true;
  }

  const newCorrelationid = uuidV1();

  req.headers['x-coreplatform-correlationid'] = newCorrelationid;

  next();

  return true;
};

module.exports = middleware;