Combining two numbers into a unique one: pairing functions

Over the past couple of years I’ve grown my interest in image and data compression — it’s a very interesting field, with a lot of interesting solutions to important and lucrative problems (think Dropbox).

Over the past few days I was running some experiments and bumped into an interesting concept: pairing positive integers into a “unique” number, with the ability to reverse the operation.

Now, in the context of compression, pairing would only be useful when the resulting integer can be consistently represented with less bits than the original ones, and that’s where I’m still stuck at (more on this on a later post), but I still wanted to share a couple interesting approaches I’ve bumped into.

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Running CI tests in Kubernetes through Github Actions

Remember me? At the end of last decade I shared a post on a simple way to run a Kubernetes cluster for local development.

Today I’d like to show the other side of the medal — running your CI environment on Kubernetes (through Github Actions).

It’s simple, mimics your production environment and it’s automated — let’s get to it!

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I’ve decided to make the WASEC ebook free during these trying times

Short post for the day to address an hopefully even shorter-lived situation we’re all in.

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Local k8s development in 2020

This decade’s about to wrap up, so I decided to spend some time describing my development workflow as the year nears its end.

What I find interesting in my setup is that it entertains working on a local k8s cluster — mainly to keep in touch with the systems that run in production.

Running k8s locally isn’t what you’d want to do to begin with, but rather a natural path once you start wanting to replicate the environment that runs your live applications. Again, you don’t need a local k8s cluster just ‘cause, so make sure you have a good reason before going through the rest of this article.

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WASEC, a book about Web Application Security, is now available for sale

I’m pleased to announce (even though you might have already heard about this on my Twitter stream) that the ebook on web application security I’ve been working on over the past year is now officially available for sale, at the hopefully-reasonable price of $6.99 $9.99.

You can now buy the book at leanpub.com/wasec, while Kindle enthusiasts will have to wait a few more days for it to become available there: it is currently available for pre-order and should be generally available in the next few days.

WASEC is the culmination of over a year of thoughts regarding my experience with web application security from the point of view of a software engineer, rather than the one of a security researcher. I believe software engineers might find it extremely interesting as it approaches defensive security from the point of view of someone who has to build an app and needs to keep security into consideration among other things.

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Web application security: what to do when…

    This post is part of the ”WASEC: Web Application SECurity” series, which is a portion of the content of WASEC, an e-book on web application security I’ve written.

    Here is a list of all the articles in this series:

  1. Web security demystified: WASEC
  2. Introduction
  3. Understanding the browser
  4. Security at the HTTP level
  5. HTTP headers to secure your application
  6. Hardening HTTP cookies
  7. Situationals

  8. If you’ve enjoyed the content of this article, consider buying the complete ebook on either the Kindle store or Leanpub.

Often times, we’re challenged with decisions that have a direct impact on the security of our applications, and the consequences of those decisions could potentially be disastrous. This article aims to present a few scenarios you might be faced with, and offer advice on how to handle each and every single of them.

This is by no means an exhaustive list of security considerations you will have to make in your day to day as a software engineer, but rather an inspiration to keep security at the centre of your attention by offering a few examples.

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Command line spinners: the magic tale of modern typewriters and terminal movies

In the latest release of ABS, we introduced a package manager that fetches an archive from GitHub and installs it locally: like in many other command-line interfaces, we decided to add a “loader” to accompany the process, something that looks like this:

I want to take a moment to reflect on how we implemented the simple spinner you see in the video, a process that derives from typewriters and movies — let’s get to it!

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My last day at Namshi: goodbye folks!

Today, I wave goodbye to the company I supported for the past 7 and a half years, Namshi.

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ABS 1.7.0: ctrl+r and other optimizations

A few days ago I released a new minor version of the ABS programming language, 1.7.0, which adds some syntactic sugar as well as improvments to the REPL — let’s get to them!

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ABS 1.6.0: the convenience of index ranges and default return values

Here we are with a new release of ABS, the elegant programming language for all of your scripting needs!

Even though small, 1.6 (with 1.6.0 and 1.6.1) introduces a couple interesting features, so let’s check them out!

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