send external IP from gmail

參考 Python實戰應用]Python寄送Gmail電子郵件實作教學

要申請 GMail 應用程式密碼，需要開啟 兩步驟驗證

選取應用程式時，雖然有郵件，但要選擇 其他

#!/usr/bin/python3

import urllib.request

from ipaddress import ip_address

import smtplib

def GetExternalIP():

    try:

        ip_b = urllib.request.urlopen("https://api.ipify.org").read()

    except:

        return ''

    ip_s = ip_b.decode('utf-8')

    try:

        ip_address(ip_s)

        return ip_s

    except:

        return ''

        

def GetBackupIP():

    try:

        file = open('/tmp/ExternalIp.txt', 'r')

        ip = file.readline()

        file.close()

    except:

        return ''

    return ip

def WriteBackupIP(ip):

    try:

        file = open('/tmp/ExternalIp.txt', 'w')

        file.write(ip)

        file.close()

    except:

        return

def SendMail(ip):

    smtp = smtplib.SMTP('smtp.gmail.com', 587)

    smtp.ehlo()

    smtp.starttls()

    smtp.login('name@gmail.com', 'lkmvemxzkegzrhwqj')

    from_addr = 'name@gmail.com'

    to_addr = 'name@yahoo.com.tw'

    msg = 'Subject:External IP\n' + ip + '\n'

    status = smtp.sendmail(from_addr, to_addr, msg)

    if status == {}:

        print('SendMail success!')

    else:

        print('SendMail fail!')

    smtp.quit

external_ip = GetExternalIP()

print('external ip {}'.format(external_ip))

backup_ip = GetBackupIP()

print('backup ip {}'.format(backup_ip))

if external_ip != '':

    if external_ip != backup_ip:

        SendMail(external_ip)

WriteBackupIP(external_ip)