entrypoint

#!/bin/bash

set -e

DEBUG_ADDRESS="debug@${MAILNAME}"
DEBUG_PASS="debug"
MAIL_LOCATION='/var/mail'
POSTMASTER_ADDRESS="postmaster@${MAILNAME}"
HOSTNAME="$(hostname -f)"

_add_line() {
    local check="$1"
    local line="$2"
    local file="$3"
    if ! grep -q "$check" "$file"; then
        echo "$line" >> "$file"
    fi
}

_log() {
    local logfile=/var/log/mail.log
    if [ ! -f $logfile ]; then
        touch $logfile
        chown syslog:adm $logfile
        chmod 640 $logfile
    fi
    echo "$(date '+%b %e %H:%I:%S') $(hostname) entrypoint[$$]: $1" >> $logfile
}

_stop() {
    /etc/init.d/postfix stop
    /etc/init.d/rsyslog stop
    if [ -f /var/run/dovecot/master.pid ]; then
        kill -15 $(cat /var/run/dovecot/master.pid)
        rm -rf /var/run/dovecot/master.pid
    fi
    _log "Docker entrypoint stop"
}

_account_add() {
    local login=$1
    local user=$(echo ${login} | cut -d @ -f1)
    local domain=$(echo ${login} | cut -d @ -f2)
    local pass=$(doveadm pw -s SHA512-CRYPT -u $login -p $2)

    local uid=$(cat /etc/passwd | grep $MAIL_FS_USER | cut -d':' -f3)
    local gid=$(cat /etc/passwd | grep $MAIL_FS_USER | cut -d':' -f4)

    if grep -q "${domain}/${user}" /etc/postfix/vmailbox; then
        _log "User '$login' already configured"
        return 0
    fi

    echo "${login}:${pass}:${uid}:${gid}::${MAIL_FS_HOME}/${domain}/${user}::" >> /etc/dovecot/userdb

    if [ ! -d "${MAIL_LOCATION}/${domain}" ]; then
        mkdir -p "${MAIL_LOCATION}/${domain}"
        chown ${uid}:${gid} "${MAIL_LOCATION}/${domain}"
    fi

    if [ ! -d "${MAIL_LOCATION}/${domain}/${user}" ]; then
        maildirmake.dovecot "${MAIL_LOCATION}/${domain}/${user}"
        maildirmake.dovecot "${MAIL_LOCATION}/${domain}/${user}/.Sent"
        maildirmake.dovecot "${MAIL_LOCATION}/${domain}/${user}/.Trash"
        maildirmake.dovecot "${MAIL_LOCATION}/${domain}/${user}/.Drafts"
        echo -e "INBOX\nSent\nTrash\nDrafts" >> "${MAIL_LOCATION}/${domain}/${user}/subscriptions"
        touch "${MAIL_LOCATION}/${domain}/${user}/.Sent/maildirfolder"
        chown -R ${uid}:${gid} "${MAIL_LOCATION}/${domain}/${user}"
    fi

    if ! grep -q "$domain" /etc/postfix/vhost; then
        echo "$domain" >> /etc/postfix/vhost
    fi

    echo "${login} ${domain}/${user}/" >> /etc/postfix/vmailbox
    /usr/sbin/postmap /etc/postfix/vmailbox
}

trap "_stop" SIGINT SIGTERM SIGHUP

_log "Docker entrypoint start"

# Configuring Postfix

if [ -n "$MAILNAME" ]; then
    echo $MAILNAME > /etc/mailname;
    /usr/sbin/postconf -e mydomain=$MAILNAME
    if ! grep -q "$MAILNAME" /etc/postfix/vhost; then
        echo "$MAILNAME" >> /etc/postfix/vhost
    fi
    /usr/sbin/postconf -e smtp_helo_name=\$myhostname.\$mydomain
fi

if [ -n "$HOSTNAME" ]; then
    /usr/sbin/postconf -e myhostname=$HOSTNAME
fi

routes=$(ip route | grep -v default | cut -d' ' -f1)
if [ -n "$routes" ]; then
    /usr/sbin/postconf -e mynetworks="127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 $routes"
    /usr/sbin/postconf -e inet_interfaces=all
fi

/usr/sbin/postconf -e relayhost=localhost
/usr/sbin/postconf -e mydestination=localhost
/usr/sbin/postconf -e virtual_maps='hash:/etc/postfix/virtual, regexp:/etc/postfix/virtual_regexp'
/usr/sbin/postconf -e sender_canonical_maps=regexp:/etc/postfix/sender_canonical_regexp
/usr/sbin/postconf -e virtual_transport=lmtp:unix:private/dovecot-lmtp
/usr/sbin/postconf -e mailbox_transport=lmtp:unix:private/dovecot-lmtp
/usr/sbin/postconf -e virtual_mailbox_domains=/etc/postfix/vhost
/usr/sbin/postconf -e virtual_mailbox_maps=hash:/etc/postfix/vmailbox
/usr/sbin/postconf compatibility_level=2

# Create user account
if [ -n "$MAIL_ADDRESS" ]; then
    _account_add "$MAIL_ADDRESS" "$MAIL_PASS"
    _add_line "$MAIL_ADDRESS" "/$MAIL_ADDRESS/ $MAIL_ADDRESS" /etc/postfix/virtual_regexp
fi

# Create debug account
_account_add "$DEBUG_ADDRESS" "$DEBUG_PASS"

# Force to send all emails to debug email address, no email to outside
_add_line "$DEBUG_ADDRESS" "/.+@.+/ $DEBUG_ADDRESS" /etc/postfix/virtual_regexp

/usr/sbin/postmap /etc/postfix/virtual_regexp
/usr/sbin/postmap /etc/postfix/virtual
/usr/sbin/postmap /etc/postfix/vmailbox
/usr/sbin/postmap /etc/postfix/sender_canonical_regexp

# Configuring Dovecot
cp -a /usr/share/dovecot/protocols.d /etc/dovecot/
sed -i -e 's/include_try \/usr\/share\/dovecot\/protocols\.d/include_try \/etc\/dovecot\/protocols\.d/g' /etc/dovecot/dovecot.conf
sed -i -e 's/^.*postmaster_address.*/postmaster_address = '${POSTMASTER_ADDRESS}'/g' /etc/dovecot/conf.d/15-lda.conf
sed -i -e 's/^.*postmaster_address.*/  postmaster_address = '${POSTMASTER_ADDRESS}'/g' /etc/dovecot/conf.d/20-lmtp.conf


_log "Docker entrypoint configured"

# Start syslog daemon
/etc/init.d/rsyslog start

# Start Postfix daemon
/etc/init.d/postfix start

# Start Dovecot daemon
rm -rf /var/run/dovecot/master.pid
/usr/sbin/dovecot -c /etc/dovecot/dovecot.conf

$@ & wait ${!}