fix: coerce telnet config values to numbers

String telnet config (e.g. quoted '1500' in /etc/prosody-muc-rest.js or
string env-var overrides) reached net.Socket.setTimeout via telnet-client
and crashed the pool on connect with ERR_INVALID_ARG_TYPE. Coerce port,
timeout, and poolSize to numbers with fallbacks before use.

Part-of: <http://gitlab.vnc.biz/uxf/prosody-muc-rest/-/merge_requests/3>

app/routes/index.js

@@ -7,15 +7,20 @@ var config = require('../../config/prosody-muc-rest.js')[env];
 var Pool = require('pg-pool');
 var createTelnetPool = require('../telnet-pool');
 
+function asNumber(value, fallback) {
+  var n = typeof value === 'number' ? value : parseInt(value, 10);
+  return Number.isFinite(n) ? n : fallback;
+}
+
 var telnetParams = {
   host: config.telnet.host,
-  port: config.telnet.port,
+  port: asNumber(config.telnet.port, 5582),
   negotiationMandatory: config.telnet.negotiationMandatory,
-  timeout: config.telnet.timeout,
+  timeout: asNumber(config.telnet.timeout, 5000),
   debug: false
 }
 
-var telnetPool = createTelnetPool(telnetParams, config.telnet.poolSize);
+var telnetPool = createTelnetPool(telnetParams, asNumber(config.telnet.poolSize, 4));
 
 async function doesMucExist(jid) {
   return new Promise((resolve, reject) => {