A node script to get forwarded private internet access port, write it to your transmission settings, and restart transmission

updatePort.js

#!/usr/bin/env node
var os = require('os');
var fs = require('fs');
var curl = require('curlrequest');  // Required via npm
var shelljs = require('shelljs');   // Required via npm
var jsonfile = require('jsonfile'); // Required via npm

// Transmission-daemon settings.json file
var transFile = '/etc/transmission-daemon/settings.json';
// Private internet access username
var username = 'username';
// Private internet access password
var password = 'password';
// Location of cliend id file, see pia docs for generating one
var clientId = "location of client id file"

var options = {
        url: 'https://www.privateinternetaccess.com/vpninfo/port_forward_assignment',
        data: {
                local_ip: os.networkInterfaces()['tun0'][0].address,
                client_id: fs.readFileSync(clientId, 'utf8'),
                user: username,
                pass: password
        }
};

curl.request(options, function(err, response) {
        var json = JSON.parse(response);
        jsonfile.readFile(transFile, function(err, transConfig) {
                transConfig['peer-port'] = json.port;
                shelljs.exec('systemctl stop transmission-daemon', function(code, output) {
                        jsonfile.writeFileSync(transFile, transConfig,{spaces:5});
                        shelljs.exec('systemctl start transmission-daemon');
                });
        });

        console.log('Updated to port', json.port);
});