get user tg ID of connected client

Hello

it is possible to get telegram ID of my mtproxy "customer"? - to filter, to allow then connection to my mtproxy only for one defined telegramID?
I mean - it's telegramID-variable available somewhere in the code of mtproxy? Then I could just add tgID-checking of connection and compile mtproxy.
Or could I get telegramID-variable somehow in somewhere of mtproxy code?

thanks