You are totally right and it can be done using ActiveStorage (ActiveStorage::Previewer that use libreoffice as well). My context was a little bit different it was an old ruby api, no ActiveStorage context available. I should have mention it in the title.
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I would imagine most people looking to do this in 2020 and beyond will be looking for a way to do it through ActiveStorage.
You are totally right and it can be done using ActiveStorage (ActiveStorage::Previewer that use libreoffice as well). My context was a little bit different it was an old ruby api, no ActiveStorage context available. I should have mention it in the title.