How to extract email after google login?

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I tried the official google API website but most of the work is already done. I know after user grants permission, we send a request and get their contact. Where is this present in the code?

I would like to auto fill the email address. Any clue as to where I should be looking in the code? I tried looking in deps/django_authopenid/util.py and deps/django_authopenid/forms.py.

It would be great if I could get pointers for facebook as well.