#!/bin/bash
# Workaround to reload Jitsi VideoBridge configuration after
# unnoticed public IP address change when jitsi is self hosted
# and connected to the internet via private DSL connection.
# This happens approximately every 24 hours and is often forced
# by the ISP.
#
# Author: C. von Thuelen

wan_ip_logfile=/tmp/last_wan_ip.log
wan_ip_changelog=/tmp/wan_ip_change.log

# read last public IP from logfile:
if [ -e $wan_ip_logfile ]; then
   source $wan_ip_logfile
fi

# get actual public IP:
new_wan_ip=`curl -s ifconfig.me/ip`

# at first start "$lastip" is empty
if [ -z $last_wan_ip ]; then
   echo "last_wan_ip=\"$new_wan_ip\"" > $wan_ip_logfile
fi

# compare last and actual public IPs:
if [ "$new_wan_ip" != "$last_wan_ip" ]; then
# if not equal:
   # save new public IP to logfile
   echo "last_wan_ip=\"$new_wan_ip\"" > $wan_ip_logfile
   daytime=`date +%Y%m%d_-_%H:%M`
   echo "Last IP update: $daytime, IP changes from $last_wan_ip to $new_wan_ip" >> $wan_ip_changelog
   # and reload jitsi videobridge
   /etc/init.d/jitsi-videobridge2 restart
else
# do nothing ;-)
   :
fi