ngrok with viber

get_public_url.js

var http = require("http");
var options = {
    hostname: '127.0.0.1',
    port: 4040,
    path: '/api/tunnels',
    method: 'GET',
    headers: {
        'Content-Type': 'application/json',
    }
};

module.exports.getPublicUrl = function() {

    return new Promise((resolve, reject) => {

        var req = http.request(options, function(res) {
            res.setEncoding('utf8');
            res.on('data', function(config) {
                config = JSON.parse(config);
                const httpsTunnel = config.tunnels.filter(t => t.proto === 'https').pop();
                resolve(httpsTunnel.public_url);
            });
        });

        req.on('error', function(e) {
            reject(e.message);
        });

        req.end();
    });
}

ngrok_example.js

const ngrok = require('./get_public_url');
const ViberBot = require('./viber-bot').Bot;

// Creating the bot with access token, name and avatar
const bot = new ViberBot(logger, {
    authToken: "YOUR_AUTH_TOKEN",
    name: "YOUR_BOT_NAME",
    avatar: "YOUR_BOT_AVATAR_URL"
});

const http = require('http');
const port = process.env.PORT || 8080;
return ngrok.getPublicUrl().then(publicUrl => {
    console.log('Set the new webhook to"', publicUrl);
    http.createServer(bot.middleware()).listen(port, () => bot.setWebhook(publicUrl));
}).catch(error => {
    console.log('Can not connect to ngrok server. Is it running?');
    console.error(error);
});