#!/usr/bin/env bash
# Abort if an error is encountered
set -e

# Exit function
trap '[ "${?}" -ne 77 ] || exit 77' ERR
function die
{
    local reset="\e[0m"
    local red="\e[0m\e[0;31m"
    local yellow="\e[0m\e[0;33m"

	echo -e "${red}
Error encountered in the following init script:
${yellow}
	${@}
${red}
Aborting...
${reset}"

    exit 77
}

# Reset
echo | tee /var/log/maillog /etc/postfix/{relaydomains,transportmaps,helo_access,rbl_override}

# Postfix
echo ${MYVEMAIL_DOMAIN} >/etc/mailname
postconf -e "myhostname = ${MYVEMAIL_SUBDOMAIN}.${MYVEMAIL_DOMAIN}"
postconf -e "mydestination = \$myhostname, ${MYVEMAIL_SUBDOMAIN}.${MYVEMAIL_DOMAIN}, localhost, localhost.localdomain, localhost"
postconf -e "mydomain = ${MYVEMAIL_DOMAIN}"

# resolv.conf
[ -d /var/spool/postfix/etc/ ] || mkdir /var/spool/postfix/etc/
cp /etc/resolv.conf /var/spool/postfix/etc/resolv.conf

# Add primary mail servers to mynetworks
if [ ${MYVEMAIL_PRIMARYMX} ]
then
    primarymx+=(${MYVEMAIL_PRIMARYMX//,/ })
    postconf -e "$(postconf mynetworks)$(printf ' %s/32' ${primarymx[@]})"
fi

# Relay setup
addmx=(${MYVEMAIL_DOMAIN})
addmx+=(${MYVEMAIL_ADDMX//,/ })
printf '%s			OK\n' ${addmx[@]} >/etc/postfix/relaydomains
for domain in ${addmx[@]}
do
    echo "${domain}			smtp:mail.${domain}:25" | tee -a /etc/postfix/transportmaps >/dev/null
    echo "${domain}			OK" | tee -a /etc/postfix/{helo_access,rbl_override} >/dev/null
done

# Start postfix
postfix start
postmap /etc/postfix/relaydomains /etc/postfix/transportmaps /etc/postfix/helo_access /etc/postfix/rbl_override
postfix reload

# Downtime log
install /dev/stdin /usr/local/bin/downtime <<- downtime
#!/usr/bin/env bash
# Send downtime log to downtime email address
echo "From: ${MYVEMAIL_SUBDOMAIN}@${MYVEMAIL_DOMAIN}
To: downtime@${MYVEMAIL_DOMAIN}
Subject: Monthly downtime log

\$(cat /var/log/downtime)" | sendmail downtime@${MYVEMAIL_DOMAIN}

# Delete log to start anew
echo >/var/log/downtime
downtime

# Monitor log
echo -e "\n\e[1;32mMail service is ready\e[0m\n"
tail -f /var/log/maillog