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#!/usr/bin/env python
#
# _tld.py
"""
Functions for parsing top-level domains (TLDs).
A stripped back version of https://github.com/john-kurkowski/tldextract
"""
#
# Copyright © 2020-2021 Dominic Davis-Foster <dominic@davis-foster.co.uk>
#
# Adapted from https://github.com/john-kurkowski/tldextract
# Licensed under the BSD 3-Clause License
#
# Copyright (c) 2020, John Kurkowski
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# stdlib
import functools
import re
import socket
from typing import List, Tuple
from urllib.parse import scheme_chars
# 3rd party
import idna
from domdf_python_tools.compat import importlib_resources
__all__ = [
"determine_suffix_index",
"extract_tld",
"extract_tlds_from_suffix_list",
"load_suffix_list",
"looks_like_ip"
]
PUBLIC_SUFFIX_RE = re.compile(r"^(?P<suffix>[.*!]*\w[\S]*)", re.UNICODE | re.MULTILINE)
PUBLIC_PRIVATE_SUFFIX_SEPARATOR: str = "// ===BEGIN PRIVATE DOMAINS==="
IP_RE = re.compile(r'^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$') # pylint: disable=line-too-long
SCHEME_RE = re.compile(fr'^([{scheme_chars}]+:)?//')
def extract_tlds_from_suffix_list(suffix_list_text: str) -> Tuple[List[str], List[str]]:
"""
Parse the raw suffix list text for its different designations of suffixes.
:param suffix_list_text:
:returns: A two element tuple of ``(public TLDs, private TLDs)``.
"""
public_text, _, private_text = suffix_list_text.partition(PUBLIC_PRIVATE_SUFFIX_SEPARATOR)
public_tlds = [m.group("suffix") for m in PUBLIC_SUFFIX_RE.finditer(public_text)]
private_tlds = [m.group("suffix") for m in PUBLIC_SUFFIX_RE.finditer(private_text)]
return public_tlds, private_tlds
@functools.lru_cache(1)
def load_suffix_list() -> Tuple[List[str], List[str]]:
"""
Load the public suffix list from disk.
:returns: A two element tuple of ``(public TLDs, private TLDs)``.
"""
return extract_tlds_from_suffix_list(importlib_resources.read_text("apeye_core", "public_suffix_list.dat"))
def _decode_punycode(label: str) -> str:
lowered = label.lower()
looks_like_puny = lowered.startswith("xn--")
if looks_like_puny:
try:
return idna.decode(label.encode("ascii")).lower()
except (UnicodeError, IndexError):
pass
return lowered
def determine_suffix_index(tlds: List[str], elements: List[str]) -> int:
"""
Returns the index of the first suffix label, or ``len(elements)`` if no suffix is found.
:param tlds: The list of public TLDs.
:param elements: The elements of the domain, e.g. ``['forums', 'bbc', 'co', 'uk']``.
"""
length = len(elements)
for i in range(length):
maybe_tld = '.'.join(elements[i:])
exception_tld = '!' + maybe_tld
if exception_tld in tlds:
return i + 1
if maybe_tld in tlds:
return i
wildcard_tld = "*." + '.'.join(elements[i + 1:])
if wildcard_tld in tlds:
return i
return length
def looks_like_ip(maybe_ip: str) -> bool:
"""
Returns whether the given string looks like an IP address.
:param maybe_ip:
"""
if not maybe_ip[0].isdigit():
return False
try:
socket.inet_aton(maybe_ip)
return True
except (AttributeError, UnicodeError):
if IP_RE.match(maybe_ip):
return True
return False
except OSError:
return False
def extract_tld(url: str) -> Tuple[str, str, str]:
"""
Takes a string URL and splits it into its subdomain, domain, and suffix
(effective TLD, gTLD, ccTLD, etc.) component.
.. versionadded:: 1.0.0 (undocumented)
.. code-block:: python
>>> Domain._make(extract_tld('https://forums.news.cnn.com/'))
Domain(subdomain='forums.news', domain='cnn', suffix='com')
>>> Domain._make(extract_tld('https://forums.bbc.co.uk/')
Domain(subdomain='forums', domain='bbc', suffix='co.uk')
""" # noqa: D400
netloc_ = SCHEME_RE.sub('', url).partition('/')[0].partition('?')[0].partition('#')[0]
netloc = netloc_.split('@')[-1].partition(':')[0].strip().rstrip('.')
labels = netloc.split('.')
translations = [_decode_punycode(label) for label in labels]
tlds, _ = load_suffix_list()
suffix_index = determine_suffix_index(tlds, translations)
suffix = '.'.join(labels[suffix_index:])
if not suffix and netloc and looks_like_ip(netloc):
return '', netloc, ''
subdomain = '.'.join(labels[:suffix_index - 1]) if suffix_index else ''
domain = labels[suffix_index - 1] if suffix_index else ''
return subdomain, domain, suffix
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