Created by M. Massenzio, 2021-12-26 Motivation Publishing one’s own source code under an Open Source license (Apache 2 being my favorite one) and making the code publicly available on GitHub is only half the story, these days, in ensuring that your open source project will reach a wide audience. A critical part is also packaging … More Publishing a Java Library to Maven Central
Created by M. Massenzio, 2021-12-24 GitHub has a set of detailed instructions, however, if you know your way around a Linux shell and basic understanding of how keys work, this is a condensed TL;DR version. Also, with minimal effort it could be automated in a shell script (even uploading the key to GitHub via API). … More How to Make Verified GitHub Commits
By holding the “Windows” key on a Microsoft keyboard, in Ubuntu, you get a MacOS-like view where you can move apps across workspaces; this is a super-useful features (and complements well the Shift-Alt-Up/Down combination to move windows across workspaces), however it does miss the ability to also move workspaces around. There is an excellent extension … More Reorder Workspaces in Ubuntu
When using multiple accounts with GitHub, it may be necessary to commit changes to private repositories which may not accessible by all accounts. This is how to generate the key and add it to the SSH agent; then add it to the GitHub account too. The original solution was here.
This is something I keep forgetting, so I figure I’ll write it down so it’s here for future reference. General rule: use the exec form of ENTRYPOINT, in other words do this: As expected, this will run apache in the foreground, with PID 1 (unless you’re being a complete idiot and using hostPID – see … More Docker ENTRYPOINT (and a note about $@)
The process is relatively straightforward, but I want to keep it here so I’ll remember it next time. The first step is to start from a relatively high-resolution PNG logo: Once you have the PNG, you need to generate the entire set of icons that are required for various devices/resolution; this can be done at … More How to create an iOS App Icon set
A simple utility to generate and decode JSON Web Tokens (JWTs) that can be used to authenticate against web applications. The code is released under the Apache 2 Open Source License. See JWT-OPA for an example of how JWTs can be used to authenticate/authorize access to protected online resources/applications. Usage Use –help (or -h) for … More JSON Web Tokens (JWT) utilities
We present a Java library that simplifies adopting the Open Policy Agent server to manage user authorization for a Spring Boot microservice, while also managing API Token (JWT) authentication. Motivation Spring Security assumes a fairly simplistic Role-Based access control (RBAC) where the service authenticates the user (via some credentials, typically username/password) and returns a UserDetails … More Integrating Open Policy Agent with Spring Security Reactive and JSON Web Tokens
The Envelope Wrapper pattern This pattern, described in “Enterprise Integration Patterns” (Ch. 8, “The Envelope Wrapper”), is used typically in messaging systems, when a number of metadata fields (for routing, security, etc.) are kept in a header, while the data used by service endpoints is serialized in a payload. For the system to be generically … More Implement the Envelope Wrapper Pattern in C++ using Google Protocol Buffers
With the relatively recent change in the frequency of Java releases (every six months) it has become pretty much required to be able to have multiple JDKs on one’s development machine, and being able to run/test them at different times, for different projects, or even for the same project. Motivation While some wizardry with symlinks … More Support multiple JDKs in Debian Linux
Code Trips & Tips 