Node.jsとExpressを使ってReact NativeアプリにSMS認証を追加する

NEXMO_NUMBER=5555555555

// app.js
const express = require('express')
const bodyParser = require('body-parser')
const app = express()
const port = process.env.PORT || 3000

app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json())

app.get('/', (req, res) => {
    res.send({message: "Hello, world!"});
});

app.listen(port, () => console.log(`Example app listening at http://localhost:${port}`))

npm i nexmo

const Nexmo = require('nexmo');

const nexmo = new Nexmo({
    apiKey: process.env.NEXMO_API_KEY,
    apiSecret: process.env.NEXMO_API_SECRET,
});

app.post('/request', (req, res) => {
    // We verify that the client has included the `number` property in their JSON body
    if (!req.body.number) {
        res.status(400).send({message: "You must supply a `number` prop to send the request to"})
        return;
    }
    // Send the request to Vonage's servers
    nexmo.verify.request({
        number: req.body.number,
        // You can customize this to show the name of your company
        brand: 'Vonage Demo App',
        // We could put `'6'` instead of `'4'` if we wanted a longer verification code
        code_length: '4'
    }, (err, result) => {
        if (err) {
            // If there was an error, return it to the client
            res.status(500).send(err.error_text);
            return;
        }
        // Otherwise, send back the request id. This data is integral to the next step
        const requestId = result.request_id;
        res.send({requestId});
    });
})

app.post('/verify', (req, res) => {
    // We require clients to submit a request id (for identification) and a code (to check)
    if (!req.body.requestId || !req.body.code) {
        res.status(400).send({message: "You must supply a `code` and `request_id` prop to send the request to"})
        return;
    }
    // Run the check against Vonage's servers
    nexmo.verify.check({
        request_id: req.body.requestId,
        code: req.body.code
    }, (err, result) => {
        if (err) {
            res.status(500).send(err.error_text);
            return;
        }
        res.send(result);
    });
})

// services.js
// Using the npm package `ngrok`, we can temporarily "deploy" our local server to test against 
const SERVER_BASE = 'http://test.ngrok.io'

export const request = ({ phoneNumber }) => {
  return fetch(`${SERVER_BASE}/request`, {
    method: 'post',
    // Tell our server we're sending JSON
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      number: phoneNumber,
    }),
  })
}

export const verify = ({ requestId, code }) => {
  return fetch(`${SERVER_BASE}/verify`, {
    method: 'post',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      requestId,
      code,
    }),
  })
}

// app.js
// We need the phone number now to send an SMS
const nexmoNumber = process.env.NEXMO_NUMBER;

app.post('/invite', (req, res) => {
    if (!req.body.number) {
        res.status(400).send({message: "You must supply a `number` prop to send the request to"})
        return;
    }
    // Customize this text to your liking!
    const text = 'You\'re invited to use the hot new app! Details here:';
    const from = nexmoNumber;
    // This regex removes any non-decimal characters. 
    // This allows users to pass numbers like "(555) 555-5555" instead of "5555555555"
    const to = req.body.number.replace(/[^\d]/g, '');

    nexmo.message.sendSms(
        from,
        to,
        text,
        {},
        (err, data) => {
            if (err) {
                const message = err.message || err;
                res.status(500).send({message});
                return;
            }
            res.send(data);
        }
    );
})

export const invite = ({ phoneNumber }) => {
  return fetch(`${SERVER_BASE}/invite`, {
    method: 'post',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      number: phoneNumber,
    }),
  })
}