"""
The tool to check the availability or syntax of domain, IP or URL.
::
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Provides the subdomain syntax checker.
Author:
Nissar Chababy, @funilrys, contactTATAfunilrysTODTODcom
Special thanks:
https://pyfunceble.github.io/#/special-thanks
Contributors:
https://pyfunceble.github.io/#/contributors
Project link:
https://github.com/funilrys/PyFunceble
Project documentation:
https://pyfunceble.readthedocs.io/en/latest/
Project homepage:
https://pyfunceble.github.io/
License:
::
Copyright 2017, 2018, 2019, 2020, 2022, 2023 Nissar Chababy
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""
from PyFunceble.checker.syntax.domain_base import DomainSyntaxCheckerBase
from PyFunceble.helpers.regex import RegexHelper
[docs]class SubDomainSyntaxChecker(DomainSyntaxCheckerBase):
"""
Provides an interface to check the syntax of a subdomain.
:param str subject:
Optional, The subject to work with.
"""
# pylint: disable=line-too-long
REGEX_VALID_SUBDOMAIN: str = r"^(?=.{0,253}$)(([a-z0-9_][a-z0-9-_]{0,61}[a-z0-9_-]|[a-z0-9])\.)+((?=.*)([a-z0-9][a-z0-9-]{0,61}[a-z0-9](?:\.)?|[a-z0-9](?:\.)?))$"
[docs] @DomainSyntaxCheckerBase.ensure_subject_is_given
def is_valid(self) -> bool:
"""
Validate the given subject if exists.
"""
extension = self.get_extension()
if (
not extension
or extension not in self.iana_dataset
and extension not in self.SPECIAL_USE_DOMAIN_NAMES_EXTENSIONS
):
return False
subject_without_extension = self.idna_subject[: self.last_point_index]
subject_without_suffix, suffix = self.get_subject_without_suffix(
self.idna_subject, extension
)
if subject_without_suffix:
if suffix.count(".") >= 2:
return RegexHelper(self.REGEX_VALID_SUBDOMAIN).match(
subject_without_extension, return_match=False
)
if "." in subject_without_suffix:
return RegexHelper(self.REGEX_VALID_SUBDOMAIN).match(
self.idna_subject, return_match=False
)
return False
if "." in subject_without_extension:
return RegexHelper(self.REGEX_VALID_SUBDOMAIN).match(
subject_without_extension, return_match=False
)
return False