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
There is something to be said for the immediacy of using Bash scripts, especially when dealing with relatively simple system operations; however, parsing command line arguments has always been rather cumbersome and usually done along the lines of painful if [[ ${1} == ‘–build’ ]]; then …. On the other hand, Python is pretty convenient … More Parse Args in Bash Scripts
Merkle Trees store a hash of the sub-tree in each of the Nodes, so that the whole tree’s contents can be validated against tampering.They are used, for example, in Bitcoin’s blockchain, and in Cassandra to validate replicas.In this article, we will show how to implement a generic Merkle Tree using features of Modern C++. Previous … More Modern C++: Implementing a Merkle Tree
The STL provides a high-performance queue class in std::queue<T>; however, the API is not very intuitive, or easy, to use and it is not safe to access from multiple threads.In this article, we will show how to wrap it in a more convenient, and thread-safe, API. The C++ Standard Template Library (STL) offers a template-class … More Modern C++: Writing a thread-safe Queue
Honestly, it should be easier – then again, it’s Gnome, nothing really is easy. Collecting a combination of various pages (this one finally yielded the right directions) it turns out one has to install imwheel and then adjust the ~/.imwheelrc file: The magic incantation is in the first couple of lines and the value (3 … More Ubuntu: adjust mouse scroll wheel sensitivity
