#! /Library/Frameworks/Python.framework/Versions/3.6/bin/python3
import smtplib
from email.message import EmailMessage as Em
#https://stackoverflow.com/questions/16683732/python-smtplib-security

import requests
from bs4 import BeautifulSoup as bs

def emailer(usr, pwd, mailserv, port, msg):
    server = smtplib.SMTP(mailserv, port)
    server.ehlo()
    server.starttls()
    server.ehlo()
    server.login(usr,pwd)
    server.sendmail(msg['From'], msg['To'], msg.as_string())
    server.close()

def tester(url):
    try:
        s=requests.Session()
        checker=s.get(url)
        if not checker.ok:
            returncode = checker.status_code
            #returns integer of server status code https://www.w3.org/Protocols/HTTP/HTRESP.html
            print(returncode)
            soup = bs(page.text, 'html.parser')

            if returncode != 200 and str(returncode).startswith('2'):
                content = '{} returned status which is not code 200 (OK): {}'.format(URL, returncode)

            elif str(returncode).startswith('3'):
                content = '{} returned a redirect status: {}/'.format(URL, returncode)

            elif str(returncode).startswith('4'):
                content = '{} returned a not found status: {}.'.format(URL, returncode)

            elif str(returncode).startswith('5'):
                content = '{} returned an internal error: {}.'.format(URL, returncode)

            elif str(soup.title) != titletest:
                    content = '{} title string has changed. Possible hacking attempt.'.format(URL)
        else:
                content = 'OK'
        return content


    except:
        content = 'Server {} appears to be down.'.format(URL)
        return content




if __name__ == '__main__':


    USER = 'user@example.invalid'
    PASS = 'passwordabc123notreally'
    MAILSERVER = 'smtp.example.invalid'
    PORT = 587
    URL='https://example.invalid'
    message = Em()
    message['Subject'] = '{} status warning'.format(URL)
    message['From'] = user
    message['To'] = 'recipient1@example.invalid, recipient2@example.invalid'
    titletest='<title>Website Title</title>'

    try:
        content=tester(URL)
    except:
        content = 'Server {} appears to be down.'.format(URL)
        #pass

    message.set_content(content)

    if content !='OK':
        emailer(USER, PASS, MAILSERVER, PORT, message)