Hi to All.
I want follow-up to the earlier message of Florian H. and let you know that I have created a fork of his great Multiuser proxy project.
His project is no longer maintained and has been archived. I have done major update to it and now it fully supports the MainUI of openHAB 3 and 4, granular filtering of user access at the level of individual Items, Pages and Sitemaps. I’m now using it in production for my quite sizable OH instance. It has been tested with both OpenHAB 3 and 4.
Feel free to look at it and test it. The documentation is fully updated as well and shall be quite self-explanatory.
GitHub - Davek145/openhab-multiuser-proxy: openHAB Multi-User support for the REST API v 2.0.2