PlantUML is incompatible with image authentication

[cotto]

When Extension:PlantUML detects that plantuml.jar has created an image, it doesn't create the proper database entries for that file. This means that if someone is attempting to use PlantUML from a wiki where image authentication is enabled, img_auth.php will see a request for a file that's not listed in the image table and will return a 404.

The code looks like it's a pain to implement but Extension:GraphViz seems to get it right and is licensed under the same terms as this extension. Extension:PlantUML might even be able to use GraphViz::uploadImages() directly though I haven't tested this.

I'd love to be able to deploy this extension. If I don't have time to come up with a fix, I will at least commit to testing potential fixes.

[samwilson]

I'm experimenting with working around this by using an external (to MediaWiki) service to render and serve the images: https://www.mediawiki.org/wiki/Extension:Diagrams