#!/usr/local/bin/python3
# -*- coding: UTF-8 -*-
import pycurl
from io import BytesIO
import json
import pprint
import urllib.parse

apikey  = 'sxxxxxxxxxxxxx'
buffer  = BytesIO()
buffer1 = BytesIO()

curl = pycurl.Curl()

# Requete chez Gandi pour avoir l'ip du DNS
curl.setopt(pycurl.HTTPHEADER, [ "X-Api-Key: " + apikey ]);
curl.setopt(pycurl.WRITEDATA, buffer)
curl.setopt(pycurl.URL, "https://dns.api.gandi.net/api/v5/domains/funambule.org/records/@/A")
curl.perform()
data = buffer.getvalue().decode('utf-8')
datajs = json.loads(data)
old_ip = datajs['rrset_values'][0]

# Requete chez ifconfig pour avoir l'ip, la vraie
curl.setopt(pycurl.URL, "https://ifconfig.me/all.json")
curl.setopt(pycurl.HTTPHEADER, [ "X-Api-Key: " + apikey ]);
curl.setopt(pycurl.WRITEDATA, buffer1)
curl.perform()
data1js = json.loads(buffer1.getvalue().decode('utf-8'))
new_ip  = data1js['ip_addr']

# Les deux sont-elles les memes ?
if old_ip != new_ip:
    # NON - Je supprime l'ancienne adresse
    buffer2 = BytesIO()    
    curl.setopt(pycurl.HTTPHEADER, [ "Content-Type: application/json", "X-Api-Key: " + apikey ])
    curl.setopt(pycurl.CUSTOMREQUEST,'DELETE')
    curl.setopt(pycurl.WRITEDATA, buffer2)
    curl.setopt(pycurl.URL, "https://dns.api.gandi.net/api/v5/domains/funambule.org/records/@/A")
    curl.perform()
    print("DELETE -> " + buffer2.getvalue().decode('utf-8'))
    
    # Je remets new_ip
    post_data = {}
    post_data["rrset_ttl"]    = 10800
    post_data["rrset_values"] = [ new_ip ]
    postfields = json.dumps(post_data)

    buffer3 = BytesIO()   
    curl.setopt(pycurl.HTTPHEADER, [ "Content-Type: application/json", "X-Api-Key: " + apikey ])
    curl.setopt(pycurl.CUSTOMREQUEST,'PUT')
    curl.setopt(pycurl.POSTFIELDS, postfields)
    curl.setopt(pycurl.WRITEDATA, buffer3)
    curl.setopt(pycurl.URL, "https://dns.api.gandi.net/api/v5/domains/funambule.org/records/@/A")
    curl.perform()
    print("PUT -> " + buffer3.getvalue().decode('utf-8'))//
    
     # Modification de la configuration du serveur turn
    old_ip_ech = old_ip.replace('.','\.')

    cmd = "sed -e 's/^external-ip={}/external-ip={}/' /etc/turnserver.conf >{}".format(old_ip_ech,new_ip,'/etc/turnserver.conf.new')
    subprocess.run(cmd,shell=True, check=True)

    cmd = "mv /etc/turnserver.conf /etc/turnserver.conf.bkp"
    subprocess.run(cmd,shell=True, check=True)

    cmd = "mv /etc/turnserver.conf.new /etc/turnserver.conf"
    subprocess.run(cmd,shell=True, check=True)

    cmd = "systemctl restart coturn"
    subprocess.run(cmd,shell=True, check=True)