SASL EXTERNAL Client certificate based authorization using node-xmpp

echo_bot_sasl_external.js

#!/usr/bin/env node

/**
 * Echo Bot - the XMPP Hello World
 * 
 * Copied from the echo_bot.js example from node-xmpp.
 **/
var xmpp = require('../lib/node-xmpp');
var argv = require('optimist').argv;
var fs = require('fs');

var argv = require('optimist')
    .usage('Usage: echo_bot_sasl_external.js --jid=<my-jid> [--host=<host>] [--port=<port>] [--legacy_ssl]')
    .demand(['jid'])
    .boolean('legacy_ssl')
    .argv;
    
var credentials = { 
    // These are necessary only if using the client certificate authentication
    key: fs.readFileSync('key.pem'),
    cert: fs.readFileSync('cert.pem'),
    
    // You might want to put the passphrase of the key file here. You'll be prompted otherwise.
    // passphrase: 'YOUR_PASSPHRASE'
}; 

var options = { jid: argv.jid, 'credentials': credentials };

if (argv.host) options['host'] = argv.host;
if (argv.port) options['port'] = argv.port;
if (argv.legacy_ssl) options['legacySSL'] = argv.legacy_ssl;

var cl = new xmpp.Client(options);

cl.on('online', function() {
    console.log('online');
	cl.send(new xmpp.Element('presence', { }).
	    c('show').t('chat').up().
        c('status').t('Happily echoing your <message/> stanzas')
	);
});

cl.on('stanza', function(stanza) {
    if (stanza.is('message') &&
        // Important: never reply to errors!
        stanza.attrs.type !== 'error') {

        // Swap addresses...
        stanza.attrs.to = stanza.attrs.from;
        delete stanza.attrs.from;
        // and send back.
        cl.send(stanza);
    }
});

cl.on('error', function(e) {
    console.error(e);
});