Tilman Kranz – Personal Blog

Disabling external Emojis in the WordPress Admin GUI

29. Juli 2025 in Technology.

In a previous article i mentioned that the “Disable Emojis” plugin removes requests to external servers for downloading Emoji graphics on a WordPress site. This works in the frontend (the part the user/customer visits). In the backend (the part the admin visits) there are hardcoded references to external emoji graphics., for example here:

https://github.com/WordPress/WordPress/blob/3d3e104908f875a0df3d5f7692feeb8874780b2a/wp-admin/about.php#L146

There also does not appear to be a suitable administrative filter that could be used to patch the unwanted HTML image references out of the effective HTML sent to the browser:

https://developer.wordpress.org/apis/hooks/filter-reference/#administrative-filters

However, the user browser suppresses the loading of such external graphics if the Content-Security-Policy (CSP) header sent by the webserver includes this statement:

img-src 'self' data:;

Now, user browsers will refuse to load any images that are not from the same site or are provided as “data” attributes (i.e. inline):

New Music Archive

18. Juli 2025 in Multimedia, Programming.

Since i sporadically make electronic compositions and master them to “tracks” in MP3 format, over the years a bunch of such files have accumulated. Until recently i was using a software i had named MyPlayer, based on mediaelement.js (“mejs”) with a 3rd-party playlist plugin and some extension for parsing an M3U playlist. As it goes, mejs published a new version containing breaking changes and an integrated playlist … For a while i tried to port my existing code to that new version, encountered many bugs and tried to fix them, but i realized that, since web development is not my main job anymore, i found insufficient time for the depth and complexity of such work, and my attempts lead nowhere.

In my new, latest iteration of the Music Archive i have changed the technology stack and implemented a more conventional backend/frontend architecture.

Summer House

20. Juli 2025 in Music.

I got a French digisynth, and out came this:

Professional Courtesy

20. Juli 2025 in Music.

Match-Resumption in case…esac of Bourne Again Shell

28. Juni 2025 in GNU/Linux, Programming.

This article describes the impact of using the lesser discussed alternative code block terminators ;;& and ;& which control the “match-resuming” behavior of Bash’s case…esac.

An Introduction to Programmable Completion in Bash

25. Juli 2025 in Administration, GNU/Linux, Programming.

I am using the terminal a lot on Linux. For my project “pulseaudio-tcp” (see here for more information) i wanted to have more comfortable command line completion in Bourne Again Shell (“Bash”). After having typed in the command name pulseaudio-tcp, when pressing the Tabulator key, i would like to see a list of all possible arguments to that command.

In this article i demonstrate how to leverage the “Programmable Completion” feature of Bash for such purposes. A reasonably recent version of Bash (4.2 or later) is assumed. You should have a basic understanding of control flow, variables, functions and arrays in Bash. In the article, we will make use of some advanced Bash features such as array expansion with pattern matching; these will be explained “on the go” as required.

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Release of pulseaudio-tcp

28. Mai 2025 in Administration, GNU/Linux, Multimedia, Programming.

pulseaudio-tcp now has its first official release. The initial release features the following changes:

GUI support with zenity for setup and other user interaction
Debian packaging

Project information not readable.

Swallowed By The Machine

20. Juli 2025 in Music.