Github support for checking if a user is part of a team

[ffurrer]

I suggest adding something like this to check if a github user is part of a team (similar to check if a user is part of an organization.

GITHUB_TEAM_MEMBER_OF_URL = 'https://api.github.com/teams/{team_id}/members/{username}'

And then something like this:

# If we have a github team id defined, test that the current user
# is a member of that team.
if data and self.GITHUB_TEAM_ID:
    member_url = GITHUB_TEAM_MEMBER_OF_URL.format(
        username=data.get('login'),
        team_id=self.GITHUB_TEAM_ID,
    ) + '?' + urlencode({
        'access_token': access_token
    })
    try:
        response = dsa_urlopen(member_url)
    except HTTPError:
        raise AuthFailed(self, 'User doesn\'t belong to the team')
    else:
        if response.code != 204:
            raise AuthFailed('User doesn\'t belong to the team')

I created a working solution with the above code for django-social-auth==0.7.28. If there are more 0.7.* versions planned please add it there as well.

[ffurrer]

And here's my branch, I'm not super happy with the implementation but I just adapted from the other code.
https://github.com/ffurrer/django-social-auth/tree/feature/github_team_support

[omab]

@ffurrer, I've added an extra github backend, similar to the github-for-organizations backend, but that checks by team instead, the code was so similar that I've added a class to deal with the common code.

Thanks

[ffurrer]

nice, thanks :)