#!/usr/bin/env bash
# Fill in the following variables
domain=             #www.google.com
mailver=            #latest/stable

# Exit on any error
set -e

# Check for subdomain
if [ $(echo ${domain} | awk -F . '{print $3}') ]
then
    _subdomain=$(echo ${domain} | awk -F . '{print $1}')
    _domain="$(echo ${domain} | awk -F . '{print $2}').$(echo ${domain} | awk -F . '{print $3}')"
else
    echo "Invalid \${domain} variable, exiting"
    exit 1
fi

# Variable check
if [ -z ${domain} ]
then
    echo "Missing variable, exiting..."
    exit 1
fi

# Certbot
sudo certbot certonly --nginx --non-interactive --agree-tos --no-eff-email \
    --staple-ocsp --hsts --no-redirect --renew-hook 'docker exec myvemailbackup postfix reload' \
     -m eff@${_domain} -d ${domain}

# Log
[ -d ./data/log/ ] || install --directory ./data/log/
echo | tee ./data/log/{mail,downtime}

# SSL
[ -d ./data/ssl/ ] || install --directory ./data/ssl/
sudo ln -s -f /etc/letsencrypt/live/${domain}/fullchain.pem ./data/ssl/tls.pem
sudo ln -s -f /etc/letsencrypt/live/${domain}/privkey.pem ./data/ssl/tls.key

# Environment file
[ -f ./.env ] || \
cat >./.env <<- gen-env
# Required
# Mail domain
MYVEMAIL_SUBDOMAIN=${_subdomain}
MYVEMAIL_DOMAIN=${_domain}

# Webmail port
MYVEMAIL_PORT=${proxyport}

# Optional
# Version: latest or stable (defaults to latest)
MYVEMAIL_VERSION=${mailver}

# Additional mail domains separated by commas
MYVEMAIL_ADDMX=${_domain}

# Backup mail servers separated by commas
MYVEMAIL_PRIMARYMX=

# Volumes
MYVEMAIL_VOLUME_SSL=
MYVEMAIL_VOLUME_LOG=
gen-env

# Cleanup
rm -r ${0} ./build/ ./README.md -f

# Create a downtime log
echo >./data/log/downtime

# Add postqueue check systemd service
sudo tee /etc/systemd/system/postqueue-check.service >/dev/null <<'POSTQ-SERVICE'
[Unit]
Description=Check postfix mail queue

[Service]
ExecStart=docker exec myvemailbackup postqueue-check
Type=oneshot

[Install]
WantedBy=basic.target
POSTQ-SERVICE
sudo tee /etc/systemd/system/postqueue-check.timer >/dev/null <<'POSTQ-TIMER'
[Unit]
Description=Run postqueue-check every 5 seconds

[Timer]
OnCalendar=*:*:0/5
Persistent=true

[Install]
WantedBy=timers.target
POSTQ-TIMER
sudo systemctl enable --now postqueue-check.timer

# Log downtimes
sudo install /dev/stdin /usr/local/bin/downtime-check >/dev/null <<MAILSERVER
#!/usr/bin/env bash
if ping -q -c 1 -W 15 1.1.1.1 >/dev/null && ping -q -c 1 -W 15 google.com >/dev/null
then
    if [[ \$(ssh ${domain} docker container inspect -f '{{.State.Running}}' myvemail) == true ]]
    then
        exit 0
    else
        echo "${domain} was inaccessible on \$(date)" >>$(pwd)/data/log/downtime
        exit 1
    fi
else
    exit 1
fi
MAILSERVER
sudo tee /etc/systemd/system/downtime-check.service >/dev/null <<'MAILSERVER-SERVICE'
[Unit]
Description=Log downtimes

[Service]
ExecStart=/usr/local/bin/downtime-check
Type=oneshot

[Install]
WantedBy=basic.target
MAILSERVER-SERVICE
sudo tee /etc/systemd/system/downtime-check.timer >/dev/null <<'MAILSERVER-TIMER'
[Unit]
Description=Run primary mail server check every minute

[Timer]
OnCalendar=*:0/1
Persistent=true

[Install]
WantedBy=timers.target
MAILSERVER-TIMER

sudo tee /etc/systemd/system/downtime-send.service >/dev/null <<'POSTQ-SERVICE'
[Unit]
Description=Send downtime log

[Service]
ExecStart=docker exec myvemailbackup downtime-send
Type=oneshot

[Install]
WantedBy=basic.target
POSTQ-SERVICE
sudo tee /etc/systemd/system/downtime-send.timer >/dev/null <<'POSTQ-TIMER'
[Unit]
Description=Send downtime log monthly

[Timer]
OnCalendar=monthly
AccuracySec=1h
Persistent=true

[Install]
WantedBy=timers.target
POSTQ-TIMER
sudo systemctl enable --now downtime-check.timer downtime-send.timer

# fail2ban postfix
sudo tee /etc/fail2ban/jail.d/postfix.local >/dev/null <<POSTFIX-FLOOD-ATTACK
[postfix-flood-attack]
enabled  = true
bantime  = 12h
filter   = postfix-flood-attack
action   = iptables-multiport[name=postfix, port="http,https,smtp,submission,pop3,pop3s,imap,imaps,sieve", protocol=tcp]
logpath  = $(pwd)/data/log/mail

[postfix]
enabled = true
maxretry = 3
bantime = 12h
filter = postfix
logpath = $(pwd)/data/log/mail
POSTFIX-FLOOD-ATTACK
sudo tee /etc/fail2ban/filter.d/postfix-flood-attack.conf >/dev/null <<'POSTFIX-FLOOD-ATTACK'
[Definition]
failregex = lost connection after AUTH from (.*)\[<HOST>\]
ignoreregex =
POSTFIX-FLOOD-ATTACK