[Enhancement]: Customizable cookie domain

[rajvatsal]

Imagine a case where you are hosting LibreChat on a sub-domain and another service in another sub-domain. You want synchronize login and logout between those to services. Say if user logs into x and then he should also be logged into y.

One step of achieving this is set domain for cookies in AuthService to a root domain. I would like a way of changing domain of the cookie without changing the source code.

It has a very simple solution. Allow us to set an env variable which accepts the value of the cookie domain.

...

COOKIE_DOMAIN=example.com

...

In AuthService we could use a constant variable COOKIE_DOMAIN = process.env('COOKIE_DOMAIN') ?? ''

Empty string would be equivalent to setting no domain (which is the current scenario)

We can also log it out in the backend for debugging.

logger.info([AuthService] cookies are set to domain ${COOKIE_DOMAIN || domains.server});