a web app to modify the text content od an .odt file

I need some inputs as to how to make a web app to modify the text content od an .odt file. I made one for word .docx as there are many infos around about it. But I would sure like to allow access to the app to Libre Office files. (java script of course)

Ok. LibreOffice/OpenOffice is open source and there is an standard for the files. So what is missing?

“Quick solution”: Let LibreOffice do the work for you. You can run LibreOffice on your web-server and send commands to the API over a port. You will need the --accept option on the command line.

https://forum.openoffice.org/en/forum/viewtopic.php?t=53657

https://wiki.documentfoundation.org/Documentation/DevGuide/Professional_UNO

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Or you may wait a bit for this ZetaOffice: