I successfully implemented Google Sign-in button where I log in using Gmail accounts from a hosted domain (HD) of mine: with Javascript I retrieve user's data, but the only infos about his/her HD is just the name (by using getHostedDomain()).
So I made a Service Account in order to get more infos about my HD (using Python API): by using HD name, I retrieve groups and members of the HD.
So far so good, but the process of information collection is not one: it is splitted in two different files executed at different times. For now, I sign-in with a Gmail account on a web page and I take note of the HD returned to which the logged user belongs; then I run my Python script in a terminal that examines the given HD name in order to retrieve groups and members.
I'm trying to implement a single execution collector where only a file is executed and possibly only one language is used: the web page is the file I cannot give up since I'd like to offer Google Sign-in, so I'm trying to access other HD infos (besides its name) from the web page with Javascript, without using my other Python script.
Is it possible to retrieve everything only using Javascript?
I think what you are looking for is to retrieve all groups for a domain or the account. Also to retrieve the data you needed for a specific user, you can use the method Users: get.