python腳本檢查ssl證書過期時間

#! /usr/bin/python
# -*- coding:utf-8 -*-
# Author: panb

##此腳本用來獲取https證書過期時間，需要先執行pip3 install pyopenssl
import argparse;
from urllib3.contrib import pyopenssl as reqs;
from datetime import datetime;

#命令行參數
parser = argparse.ArgumentParser(description='本腳本獲取https證書到期時間');
parser.add_argument('-w', '-www', metavar='https網站，如www.jcici.com',required=True, dest='sites', nargs='+', help='輸入監控的https網站')
args = parser.parse_args()

#公網驗證
def get_notafter(www):
    cert = reqs.OpenSSL.crypto.load_certificate(reqs.OpenSSL.crypto.FILETYPE_PEM, reqs.ssl.get_server_certificate((www, 443)));

    notafter = datetime.strptime(cert.get_notAfter().decode()[0:-1], '%Y%m%d%H%M%S');
    remain_days = notafter - datetime.now();
    print(www, '證書到期天數是：', remain_days.days);

#輸出結果
try:
    for site in args.sites:
        get_notafter(site);
except Exception as e:
    print("出現錯誤，請檢查域名是否正確或者可達性");