Determine from a external PHP App if a Grav user is logged in

Hi,
I want to integrate an existing PHP App into Grav, without writing a Plugin.
Therefore I need to access the current user's name and if he authenticated successfully with Grav.

Is there a way to get this data from an external PHP App?

In e.g. Joomla, it is possible to launch a minimal core instance and get the authenticated user with

$user =& JFactory::getUser();

Any similar procedure here ?

Thank you very much,
Harald

Fantastic! Yes there's nothing to fear about writing a plugin. I didn't follow exactly what you were doing here, but please consider releasing your plugin openly if you think it can be useful to others :)

I will release it after excessive testing 🙂

@hschneider I like the promise of 'excessive testing' before releasing code to the community... 👍