app.js

require('dotenv/config')
require('mongodb')
const express = require('express')
const Vonage = require('@vonage/server-sdk')
const bodyParser = require('body-parser')
const mongoose = require('mongoose')

let app = express()
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({
    extended: true
}))
app.use(express.static('public'))

mongoose.connect(process.env.MONGO_URL, {
    useNewUrlParser: true,
    useUnifiedTopology: true
})
const contactsSchema = new mongoose.Schema({
    name: String,
    number: Number
})
const Contacts = mongoose.model('Contacts', contactsSchema)

const vonage = new Vonage({
    apiKey: process.env.API_KEY,
    apiSecret: process.env.API_SECRET,
    applicationId: process.env.APPLICATION_ID,
    privateKey: process.env.PRIVATE_KEY
})

app.get('/', function(req, res){
    res.sendFile('index.html')
})

app.post('/contacts', function(req, res) {
    const contact = new Contacts({
        name: req.body.name
    })
    contact.save()
    res.redirect('/')
})

app.get('/contacts', function(req, res) {
    Contacts.find({}, function(err, contacts) {
        if (err) {
            console.log(err)
        } else {
            res.json(contacts)
        }
    })
})

app.post('/alert', function(req, res) {
    let long = req.body['coordinates']['long']
    let lat = req.body['coordinates']['lat']
    let contacts = req.body['contacts']
    for (let i = 0; i <= contacts.length; i++) {
        vonage.channel.send({
                'type': 'sms',
                "number": contacts[i].number
            }, {
                'type': 'sms',
                "number": process.env.FROM_NUMBER
            }, {
                'content': {
                    'type': 'text',
                    'text': `SOS! Your friend is in an emergency! Their latitude is ${lat} and` +
                        `their longitude is ${long}!`
                }
            },
            (err, data) => {
                if (err) {
                    console.error(err)
                } else {
                    console.log(data.message_uuid)
                }
            }
        )
    }
})

app.listen(process.env.PORT)