How to use publicsuffixlist - 5 common examples

def is_email_blacklisted(address):
    """
    Determines if a supplied email address is present in the 'emailblacklist' table.
    Parameters:
        address: The email address to split out the domain from.
    Returns:
        Boolean True if present on the blacklist, or False otherwise.
    """
    _, domain = address.rsplit("@", 1)
    psl = PublicSuffixList()
    private_suffix = psl.privatesuffix(domain=domain)

    # Check the disposable email address list
    if private_suffix in DISPOSABLE_DOMAINS:
        return True

    # Check the explicitly defined/blacklisted domains.
    return d.engine.scalar(
        "SELECT EXISTS (SELECT FROM emailblacklist WHERE domain_name = %(domain)s)",
        domain=private_suffix,
    )

def check_for_public_suffixes(filename):
    lines = files[filename]
    suffix_detected = False
    psl = None
    download_suffixes()
    with open("public_suffix_list.dat", "r") as latest:
        psl = PublicSuffixList(latest)
    for i, line in enumerate(lines):
        current_line = line.strip()
        public_suffix = psl.publicsuffix(current_line)
        if public_suffix == current_line:
            print(
                f"The line number {i+1} contains just a public suffix: {current_line}"
            )
            suffix_detected = True
    if suffix_detected:
        print(
            "At least one valid public suffix found in {!r}, please "
            "remove it. See https://publicsuffix.org for details on why this "
            "shouldn't be blocklisted.".format(filename)
        )
        sys.exit(1)

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

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

# Track to see if any scripts were on foreign TLDs
        scripts_on_foreign_origin = False

        # Get all the scripts
        scripts = soup.find_all('script')
        for script in scripts:
            if script.has_attr('src'):
                # Script tag parameters
                src = urlparse(script['src'])
                integrity = script.get('integrity')
                crossorigin = script.get('crossorigin')

                # Check to see if they're on the same second-level domain
                # TODO: update the PSL list on startup
                psl = PublicSuffixList()
                samesld = True if (psl.privatesuffix(urlparse(response.url).netloc) ==
                                   psl.privatesuffix(src.netloc)) else False

                if src.scheme == '':
                    if src.netloc == '':
                        # Relative URL (src="/path")
                        relativeorigin = True
                        relativeprotocol = False
                    else:
                        # Relative protocol (src="//host/path")
                        relativeorigin = False
                        relativeprotocol = True
                else:
                    relativeorigin = False
                    relativeprotocol = False