Feature request/Help request: Restrict Google-OAuth2 to specific domain

[DeltaLima]

What is the expected result?

Authentication should be possible only from allowed domain.

I haven't found the specific point to define it in HumHum / Yii Framework. that should be possible with the "hd" parameter for OAuth. Regarding to this Document:

https://developers.google.com/identity/protocols/OpenIDConnect#hd-param

Should it be already possible to define it, could you maybe help me to find the right place for it? Or is there a Code change necessary?

Thanks and best regards! :)

Additional info

Q	A
HumHub version	1.3.7?
PHP version	7
Operating system	Debian 9

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