How to restrict Google Form responses to logged in users?

Question

I want to find a way to automatically find out who responded to my form (I am using Forms for quizzing and surveying students).

Is there any way to disallow the form from being filled out unless the user is logged in?

Given they are logged in, can I somehow get their Google username or Gmail address automatically through a script?

In addition, if they are logged in, can I make sure that they can only edit their own response, and not submit multiple ones? Right now, editing your response is only possible if you remember the link to your personal response.

Answer 1

I believe everything is handled by the google form. In the top part of the form there is an option to make sure that the person who is answering is logged. And it's in the same place that there is the option to collect the username