Is hydronium an electrophile, nucleophile, both or neither?

**Is hydronium an electrophile or a nucleophile**? I expected $\ce{H3O+}$ to be a nucleophile due to the presence of electrons in the $\ce{2p}$ orbitals of $\ce{O}$. But the answer key of the test states that its none of them. 


I can rationalise it this way: If $\ce{O}$ donates its 2 electrons then there would be 2 positive charges on $\ce{O}$ leading to instability. 


But I am not too sure of my reasoning either. Isn't hydronium serving as a nucleophile in its reaction with $\ce{OH-}$ ? Why is it then neither an electrophile nor a nucleophile? 


[Google books](https://www.google.co.in/search?q=is%20hydronium%20ion%20electrophile&rlz=1C1CHBF_enIN788IN788&source=lnms&tbm=bks&sa=X&ved=0ahUKEwir2a-12_7ZAhWKM48KHZLTBJkQ_AUIDygA&biw=1366&bih=637) results show that its mentioned as an electrophile in some books. While there's disagreement on other sides on the internet? What's the true classification? 


