Resetting utils subtree.
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"""
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AUTHOR:
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Khushal P Soonderji
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DATE:
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Friday, 30th May, 2025
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OBJECTIVE:
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To provide a base class for common behaviour of Google's APIs.
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REFERENCES:
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1. Quickstart: https://developers.google.com/gmail/api/quickstart/python
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DOWNLOADS:
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N/A
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"""
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# *****************************************************************************************************************
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# ***** ****
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# *** IMPORT ***
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# ***** ****
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# *****************************************************************************************************************
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# To make sibling directories accessible for imports:
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import sys
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sys.path.append(".")
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sys.path.append("..")
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# System-level activities:
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import io
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# To check certs through cryptographic algorithms:
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from cryptography import x509
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from cryptography.hazmat.backends import default_backend
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# To fetch remote certs:
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import ssl
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import socket
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from urllib.parse import urlparse
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# To work with date and time:
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import datetime
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import humanize
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# For debugging:
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from icecream import IceCreamDebugger
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# *****************************************************************************************************************
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# ***** ****
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# *** MACROS / ONE-TIME INIT ***
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# ***** ****
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# *****************************************************************************************************************
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# --- Nothing Yet
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# *****************************************************************************************************************
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# ***** ****
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# *** VARIABLES ***
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# ***** ****
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# *****************************************************************************************************************
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# --- Nothing Yet
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# *****************************************************************************************************************
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# ***** ****
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# *** FUNCTIONS ***
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# ***** ****
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# *****************************************************************************************************************
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# --- Nothing Yet
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# *****************************************************************************************************************
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# ***** ****
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# *** CLASSES ***
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# ***** ****
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# *****************************************************************************************************************
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class CertExpiryCheck:
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# Certificate variables:
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certificate: str | None = None
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not_valid_before: datetime.datetime | None = None
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not_valid_after: datetime.datetime | None = None
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exception: Exception | None = None
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exception_str: str | None = None
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# ┏┓
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# ┃ ┏┓┏┓╋┏┓┓┏┏╋┏┓┏┓
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# ┗┛┗┛┛┗┗┛ ┗┻┗┗┗┛┛
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def __init__(
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self,
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debug: bool = False,
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debug_prefix: str = "Certs Exp. | "
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):
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"""
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This simple class just checks if a provided certificate is valid or not and what is the date range in which it
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is valid.
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"""
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# Prepare the debugging utility:
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self._debug_prefix = debug_prefix
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self._printer = IceCreamDebugger(prefix = debug_prefix, includeContext = True)
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if not debug: self._printer.disable()
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# ┓┏ ┓
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# ┣┫┏┓┃┏┓┏┓┏┓┏
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# ┛┗┗ ┗┣┛┗ ┛ ┛
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# ┛
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def enable_debug(self):
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self._printer.enable()
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def disable_debug(self):
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self._printer.disable()
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def _clear(self):
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self.not_valid_before = None
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self.not_valid_after = None
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self.exception = None
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self.exception_str = None
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# ┏┓ •
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# ┃┃┏┓┏┓┏┓┏┓┏┓╋┓┏┓┏
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# ┣┛┛ ┗┛┣┛┗ ┛ ┗┗┗ ┛
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# ┛
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@property
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def is_valid(self) -> bool | None:
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"""
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Quickly tests if a loaded certificate is valid or not.
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:return: True if the certificate is valid, False if it isn't. Returns None if no certificate was loaded.
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"""
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# Check if the certificate was loaded correctly:
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if self.not_valid_after is None or self.not_valid_before is None:
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self._printer("Please load a certificate first.")
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return None
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# Check if the cert is within the given time limits:
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now = datetime.datetime.now(datetime.timezone.utc)
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if self.not_valid_before <= now <= self.not_valid_after: return True
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else: return False
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@property
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def ttl(self) -> float | None:
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"""
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Gives the time for which the certificate is valid in seconds.
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:return: Time for which the certificate is valid in seconds. None if the certificate was not loaded.
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"""
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# Check if the certificate was loaded correctly:
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if self.not_valid_after is None or self.not_valid_before is None:
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self._printer("Please load a certificate first.")
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return None
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# Calculate the no. of seconds left till expiry:
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now = datetime.datetime.now(datetime.timezone.utc)
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ttl_seconds = (self.not_valid_after - now).total_seconds()
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return ttl_seconds
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@property
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def ttl_human_readable(self) -> str | None:
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"""
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Gives human-readable validity period for certificates.
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e.g.: 1. valid for a month
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2. expired 3 days ago
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3. valid for 2 months
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:return: Human-readable validity period for certificates. None if the certificate was not loaded.
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"""
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# Check if the certificate was loaded correctly:
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if self.not_valid_after is None or self.not_valid_before is None:
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self._printer("Please load a certificate first.")
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return None
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# Calculate the no. of seconds left till expiry:
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now = datetime.datetime.now(datetime.timezone.utc)
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ttl_seconds = (self.not_valid_after - now).total_seconds()
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ttl_readable = humanize.naturaldelta(datetime.timedelta(seconds = ttl_seconds))
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if ttl_seconds <= 0: ttl_readable = f"expired {ttl_readable} ago"
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else: ttl_readable = f"valid for {ttl_readable}"
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return ttl_readable
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# ┓ ┓ ┏┓
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# ┃ ┏┓┏┏┓┃ ┃ ┏┓┏┓╋┏
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# ┗┛┗┛┗┗┻┗ ┗┛┗ ┛ ┗┛
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def load_local(self, path: str | io.BytesIO) -> bool:
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"""
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Loads a certificate stored on a local file path and checks for its validity.
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:param path: local file path where the certificate is stored.
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:return: True if the certificate was loaded correctly, False if the certificate wasn't loaded.
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"""
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# Note down the certificate that is being tested:
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self.certificate = path
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# Clear any previous assessment:
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self._clear()
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try:
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# Read the contents of the certificate file:
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if isinstance(path, str):
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with open(path, 'rb') as f:
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cert_data = f.read()
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elif isinstance(path, io.BytesIO):
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path.seek(0)
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cert_data = path.read()
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else: cert_data = None
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# Load the certificate:
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cert = x509.load_pem_x509_certificate(cert_data, default_backend())
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# Get the not valid before and not valid after dates:
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self.not_valid_before = cert.not_valid_before_utc
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self.not_valid_after = cert.not_valid_after_utc
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# All done successfully:
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return True
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except Exception as exception:
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self._printer(path, exception)
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self.exception = exception
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self.exception_str = str(exception)
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return False
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# ┳┓ ┏┓
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# ┣┫┏┓┏┳┓┏┓╋┏┓ ┃ ┏┓┏┓╋┏
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# ┛┗┗ ┛┗┗┗┛┗┗ ┗┛┗ ┛ ┗┛
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def load_remote(self, hostname: str, port: int = 443) -> bool:
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"""
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Loads the certificate of a remote host and checks for its validity.
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:param hostname: The remote host URL.
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:param port: The remote host's port on which the service is running.
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:return: True if the certificate was loaded correctly, False if the certificate wasn't loaded.
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"""
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# Parse the URL's hostname:
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hostname = urlparse(hostname).hostname or hostname
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# Note down the certificate that is being tested:
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self.certificate = f"{hostname}:{port}"
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# Clear any previous assessment:
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self._clear()
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try:
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# Fetch the remote certificate:
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context = ssl.create_default_context()
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with socket.create_connection((hostname, port)) as sock:
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with context.wrap_socket(sock, server_hostname = hostname) as ssock:
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# Attempt to retrieve the certificate in DER format
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try:
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der_cert = ssock.getpeercert(binary_form = True)
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cert = x509.load_der_x509_certificate(der_cert, default_backend())
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# If DER parsing fails, retrieve the certificate in PEM format:
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except ValueError:
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pem_cert = ssl.DER_cert_to_PEM_cert(ssock.getpeercert(binary_form = True))
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cert = x509.load_pem_x509_certificate(pem_cert.encode(), default_backend())
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# Get the not valid before and not valid after dates:
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self.not_valid_before = cert.not_valid_before_utc
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self.not_valid_after = cert.not_valid_after_utc
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# All done successfully:
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return True
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except Exception as exception:
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self._printer(hostname, port, exception)
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self.exception = exception
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self.exception_str = str(exception)
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return False
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# *****************************************************************************************************************
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# ***** ****
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# *** MAIN PROGRAM ***
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# ***** ****
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# *****************************************************************************************************************
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if __name__ == "__main__":
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def show_details(my_cert: CertExpiryCheck):
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print("\n---\n")
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print("Certificate :", my_cert.certificate)
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print("Not Before :", my_cert.not_valid_before)
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print("Not After :", my_cert.not_valid_after)
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print("Is Valid :", my_cert.is_valid)
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print("TTL (seconds) :", my_cert.ttl)
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print("TTL (human) :", my_cert.ttl_human_readable)
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print("Exception :", my_cert.exception_str)
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# Create an instance:
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my_cert = CertExpiryCheck(debug = False)
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# Test a local path:
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my_cert.load_local(r"C:\Users\Khushal P Soonderji\Desktop\Dktp Files\certs\mongo\mongo_data_cert.pem")
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show_details(my_cert)
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# Test a local path:
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my_cert.load_local(r"C:\Users\Khushal P Soonderji\Desktop\Dktp Files\certs\kafka\privkey.pem")
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show_details(my_cert)
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# Test a local path:
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my_cert.load_local(r"C:\Users\Khushal P Soonderji\Desktop\Dktp Files\certs\kafka\fullchain.pem")
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show_details(my_cert)
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# Test a remote path:
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my_cert.load_remote("https://thecaoffice.com/", port = 443)
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show_details(my_cert)
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