def associate_by_email(details, user=None, *args, **kwargs):
"""Return user entry with same email address as one returned on details."""
if user:
return None
email = details.get('email')
if email:
# try to associate accounts registered with the same email address,
# only if it's a single object. AuthException is raised if multiple
# objects are returned
try:
return {'user': UserSocialAuth.get_user_by_email(email=email)}
except MultipleObjectsReturned:
raise AuthException(kwargs['backend'], 'Not unique email address.')
except ObjectDoesNotExist:
pass
