def reduce_domain(domain_in):
if not PublicSuffixList().publicsuffix(domain_in, accept_unknown=False):
return None
domain = PublicSuffixList().privatesuffix(domain_in)
if domain:
domain = domain.lower()
else:
log.debug("No eTLD for {}".format(domain))
log.debug("Trimmed domain from {0} to {1}".format(domain_in, domain))
return domain
