Thursday, November 30, 2017 - the small tool I use to enable SSH public/private key login

I am just dropping that here. This is - a small tool I use to enable SSH login to a remote host.

I use it the same way I use ssh:

./ delian@remote-host

The code:

[ -f ~/.ssh/ ] || ssh-keygen -t rsa -b 2048; ssh $* "(mkdir -p ~/.ssh; echo \"$(cat ~/.ssh/\" >> ~/.ssh/authorized_keys)"

Monday, May 29, 2017

File deduplication written in bash

Once there was this guy asking me would I be able to write a file deduplication script in shell.

It is not very hard and it is a curious problem, so I am publishing my code here:

[ ! -d $1 ] && echo "$1 is not a directory! exit" &&  exit 1
cd $1
find . -type f -ls | awk '{ print $7":"$11 }' | sort -k 1,1 -n -r | while read line; do
  if [ "$oldsize" == "$size" -a -f "$name" -a -f "$oldname" ] && diff -s "$oldname" "$name"; then
      rm -f "$name"
      ln "$oldname" "$name"
I am wondering, would it be possible to be made even simpler...

Monday, April 3, 2017

UNIFICli - a CLI tool to manage Ubiquiti's Unifi Controller

As mentioned earlier, I made a nodejs library interface to the Ubiquiti Unifi Controller's REST API which is available here -

Now I am introducing a small, demo, CLI interface, which uses that same library to remotely connect and configure Ubiquiti Unifi Controller (or Ubiquiti UC-CK Cloud Key).

This software is available on GitHub here - and its main goal for me is to be able to test the node-unifiapi library. The calls and parameters are almost 1:1 with the library and this small code provides great example how such tools could be built.

This tool is able to connect to a controller either via direct HTTPS connection or via WebRTC trough Ubiquiti's Unifi Clould network (they name it SDN). And also you have a command you could use to connect to wireless access point via SSH over WebRTC.

The tool is not completed, neither have any goal. Feel free to fix bugs, extend it with features or provide suggestions. Any help with the development will be appreciated.

Commands can be executed via the cli too:
npm start connectSSH 00:01:02:03:04:05 -l unifikeylocation

Tuesday, March 14, 2017

node-unifiapi - NodeJS API to access Ubiquiti Unifi Controller API

I have completed the initial rewrite of the PHP based UniFi-API-Browser to JavaScript for NodeJS.
The module and some auto generated documentation with some basic examples is available here:

The supported features includes all of the UniFi-API-Browser calls via the direct REST http calls or via WebRTC (using Ubiquiti Unifi Cloud) as well as SSH access to Unifi Access Points via WebRTC.

Tuesday, January 17, 2017

Private Properties with JavaScript (prototypes)

Some are saying that JavaScript does not have private properties with prototypes and it is not like TypeScript or Python.

However, that is not fully correct, especially with this comparison.

Python doesn't have anything private. All the scopes are globally addressable and all the variables, properties and methods are accessible globally (as long as you know the scope path, which could be easily traced from within the software itself).

TypeScript is just a pre-processor. It will do extra semantic checks during compilation, but no enforcement of anything on runtime. 

However, it is generally untrue that you have no private properties available in JavaScript.

You do have scope inheritance and you don't have global access to any scope from outside. Therefore you can make private properties easily.

For example, if you have:

function F1() {
  var XXX = 0;
  return function () {
     return XXX;

F1()() will respond with the value of XXX but there is no way to access XXX from outside.

So what about prototyping?
You can do this there too.

function F1() {
  var XXX = 'yyy'; // Private property
  function F1() {
     // You constructor is here
     this.YYY = 'xxx'; // public property
  F1.prototype.method1 = function() {
    return XXX + this.YYY;
  return new F1();

Then if you do:

x = F1();
x = new F1();  // Both works the same way
and check:
console.log(x.YYY); // output 'xxx'
console.log(x.XXX); // output Error
console.log(x.method1()); // output 'yyyxxx'

So everything works! You have prototyping with private and public properties.
The same way you can do private and public methods.

The only thing that will not work with this method is instanceof
x instanceof F1 will respond with false, because x is not an instance of the upper F1, but the inner F1

The current ES6 standard have classes, but they are essentially a wrapper on top of prototype. So this technique still apply. Additionally with Object.defineProperty you could apply extra protection on top of a property.

There is another approach to the problem. Without prototypes.

function F1() {
  if (!this instanceof F1) return; // Protect against global scope polution
  var XXX = 'yyy'; // Private property
  this.YYY = 'xxx'; // Public property
  function PrivateMethod() {
    return XXX + this.YYY;
  this.method1 = function() {
    return PrivateMethod();

With the shown above approach you have both private and public methods and properties, with workable instanceof

Monday, January 2, 2017

Python UniFI API for management of Ubiquity UniFI infrastructure

I am porting to Python the UniFi Browser API (PHP) which could be used to manage the UniFI AP infrastructure from external application to the UniCK Controller.

The port is completed, however, the work is ongoing, the API is updated (adding new calls and support for HotSpot 2.0) and changes may happen.

Documentation will come a bit later, but I guess the code is self explanatory.

For those who are interested, you could find it here: