server.js

var express = require('express');
var bodyParser = require('body-parser');
var multer = require('multer');
var upload = multer({dest: 'uploads/'});

var app = express();



app.get('/', function(req,res){

  res.send('working');
});


//get
app.get('/api/phonenumbers/parse/text/:phoneNumber', (req, res) => {

  if(req.params.phoneNumber == 'empty') {
    res.status(400).send([]);
  }
  else {
    var arr = [];
    arr.push(req.params.phoneNumber);
    var finalArr = numParser(arr, res);

    res.status(200).send(finalArr);
  }
});


//post
app.post('/api/phonenumbers/parse/file', upload.single('file'), (req, res) => {

  if(!req.file) {
    res.status(400).send('No file received');
  }
  else {
    var fs = require('fs');
    var contents = fs.readFileSync(req.file.path);
    var fileText = contents.toString('ascii');
    var buf = Buffer.from(fileText, 'base64');
    var numbers = buf.toString('ascii');
    var numArr = numbers.split('\n');

    var finalArr = numParser(numArr, res);

    res.status(200).send(finalArr);
  }
});


app.listen((process.env.PORT||8000), () => {
  console.log('The server is running on port 8000');
});



// Numbers parser
function numParser(arr, res) {

  var phoneUtil = require('google-libphonenumber').PhoneNumberUtil.getInstance();
  var PNF = require('google-libphonenumber').PhoneNumberFormat;

  try {
    var tel;
    var formattedArr = [];
    
    for (var i = 0; i < arr.length; i++) {
      tel = phoneUtil.parse(arr[i], 'CA');
      formattedArr.push(phoneUtil.format(tel, PNF.INTERNATIONAL));
    }

    
    var uniqArr = uniq(formattedArr);
    
    return uniqArr;
  
  } catch(err) {
    res.status(400).send("Exception caught: " + err);
  }
}

// Returns an array of unique phone numbers
function uniq(a) {
  return Array.from(new Set(a));
}

module.exports = app;