routes.js

const express = require('express');
const router = express.Router();
const axios = require('axios');
const trafficFinesEndpoint = 'https://www.karnatakaone.gov.in/PoliceCollectionOfFine/FineDetails';
const regPattern = RegExp(/^ka(?!00)([0-6][0-9]|70)[a-z]{0,2}[0-9]{4}$/i);

router.get('/', (req, res) => {
  res.send({
    status: 'ok',
    message: 'Why say hello world!, when you can say HELLO UNIVERSE!'
  });
});

router.get('/fines', (req, res) => {
  const registration = req.query.registration;

  if(!registration || !regPattern.test(registration)){
    return res.status(400).send({
      status: 'error',
      message: 'A valid \'registration\' param in \'KAXX(AZ)XXXX\' format is required.'
    });
  }

  const options = {
    params: {
      SearchBy: 'REGNO',
      ServiceCode: 'BPS',
      SearchValue: registration
    }
  };
  return axios.post(trafficFinesEndpoint, null, options).then(extResponse => {
    res.send(extResponse.data);
  }).catch(err => {
    console.error(err);
    res.status(400).send(err);
  });
});

router.get('**', (req, res) => {
  res.status(400).send({
    status: 'error',
    message: 'use \'/fines\' endpoint with \'registration\' query param in \'KAXX(AZ)XXXX\' format to check fines.'
  });
});

module.exports = router;