#!/bin/bash

echo "========================================="
echo "    Asterisk container starting up       "
echo "========================================="

if [[ ! -f /etc/asterisk/asterisk.conf ]]
then
	# extract default distro config in volume
	echo " -- No asterisk.conf found, unpacking distribution config for production"
	cd /etc/asterisk
	tar zxf /etc/ast-conf.tgz

	# (also) extract default distro config in dpkg-dist for easy reference
	rm -rf dpkg-dist
	mkdir dpkg-dist
	cd dpkg-dist
	tar zxf /etc/ast-conf.tgz
else
	# extract default distro config in dpkg-dist for easy reference
	echo " -- Existing asterisk.conf found, unpacking distribution config in reference folder"
	cd /etc/asterisk
	rm -rf dpkg-dist
	mkdir dpkg-dist
	cd dpkg-dist
	tar zxf /etc/ast-conf.tgz
fi

# ensure cdr-csv subdir exists
mkdir -p /var/log/asterisk/cdr-csv

# fix permissions
chown -R asterisk:asterisk /etc/asterisk
chmod -R o+r /etc/asterisk
chown -R asterisk:asterisk /var/spool/asterisk
chmod -R o+r /var/spool/asterisk
chown -R asterisk:asterisk /var/log/asterisk
chmod -R o+r /var/log/asterisk

# detect public IPv4 address and configure for sip
if [ -z "$IP4" ]; then
  IP4=`curl -4 -s http://icanhazip.com/`
  echo " -- Detected external (public) IPv4 address $IP4 (requested from icanhazip)"
  echo " -- You can override this by passing the IP4 environment variable with the desired address"
else
  echo " -- Detected external (public) IPv4 address $IP4 (set from environment)"
fi
sed -ri "s/external_media_address=(([0-9]{1,3}\.){3}[0-9]{1,3})/external_media_address=$IP4/g" /etc/asterisk/pjsip.conf
sed -ri "s/external_signaling_address=(([0-9]{1,3}\.){3}[0-9]{1,3})/external_signaling_address=$IP4/g" /etc/asterisk/pjsip.conf

# configure msmtp
echo "account default" > /etc/msmtprc
if [ -n "$SMARTHOST" ]; then
  IFS=: read -r SMARTHOST_HOST SMARTHOST_PORT <<< "$SMARTHOST"
  echo " -- Expanding '$SMARTHOST' as default SMTP relay"
fi
if [ -n "$SMARTHOST_HOST" ]; then
  echo "host $SMARTHOST_HOST" >> /etc/msmtprc
  echo " -- Set '$SMARTHOST_HOST' as default SMTP relay host"
else 
  echo "host mail" >> /etc/msmtprc
  echo " -- Using 'mail' as default SMTP relay host"
fi
if [ -n "$SMARTHOST_PORT" ]; then
  echo "port $SMARTHOST_PORT" >> /etc/msmtprc
  echo " -- Set $SMARTHOST_PORT as default SMTP relay port"
else 
  echo "port 587" >> /etc/msmtprc
  echo " -- Using 587 as default SMTP relay port"
fi
echo "from msmtp@asterisk" >> /etc/msmtprc
# create symlink for asterisk to use
ln -s /usr/bin/msmtp /usr/sbin/sendmail

# go live
echo " -- Launching Asterisk"
/usr/sbin/asterisk -f -p -U asterisk