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# SPDX-FileCopyrightText: 2026 Dennis Fink <me+coding@dennisfink.me>
#
# SPDX-License-Identifier: BSD-3-Clause
import ipaddress
from urllib.parse import urlsplit
import dns.exception
import dns.resolver
class AddressResolutionError(Exception):
pass
def is_public_url(url: str) -> bool:
"""
Check whether a URL resolves exclusively to public IP addresses.
:param url: URL whose hostname should be resolved.
:return: Whether all resolved addresses are globally routable.
:raises ValueError: If the URL does not contain a hostname.
:raises AddressResolutionError: If the hostname cannot be resolved.
"""
hostname = urlsplit(url).hostname
if hostname is None:
raise ValueError("No hostname was specified")
try:
answers = dns.resolver.resolve_name(hostname)
except dns.exception.DNSException as exc:
raise AddressResolutionError(
f"Could not resolve hostname {hostname!r}"
) from exc
else:
for address in answers.addresses():
if not ipaddress.ip_address(address).is_global:
return False
return True
def is_http_url(url: str) -> bool:
"""
Check whether a URL is an absolute HTTP or HTTPS URL.
:param url: URL to validate.
:return: Whether the URL uses HTTP or HTTPS and contains a hostname.
"""
try:
parsed = urlsplit(url)
except ValueError:
return False
return parsed.scheme.lower() in {"http", "https"} and parsed.hostname is not None
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