#!/usr/bin/env bash

set -o pipefail

if [[ "$(uname -r)" =~ ^4\.15\.0-60 ]]; then
  echo "DO NOT RUN mailcow ON THIS UBUNTU KERNEL!";
  echo "Please update to 5.x or use another distribution."
  exit 1
fi

if [[ "$(uname -r)" =~ ^4\.4\. ]]; then
  if grep -q Ubuntu <<< $(uname -a); then
    echo "DO NOT RUN mailcow ON THIS UBUNTU KERNEL!";
    echo "Please update to linux-generic-hwe-16.04 by running \"apt-get install --install-recommends linux-generic-hwe-16.04\""
    exit 1
  fi
fi

if grep --help 2>&1 | grep -q -i "busybox"; then
  echo "BusyBox grep detected, please install gnu grep, \"apk add --no-cache --upgrade grep\""
  exit 1
fi
if cp --help 2>&1 | grep -q -i "busybox"; then
  echo "BusyBox cp detected, please install coreutils, \"apk add --no-cache --upgrade coreutils\""
  exit 1
fi

for bin in openssl curl docker-compose docker git awk sha1sum; do
  if [[ -z $(which ${bin}) ]]; then echo "Cannot find ${bin}, exiting..."; exit 1; fi
done

if [ -f mailcow.conf ]; then
  read -r -p "A config file exists and will be overwritten, are you sure you want to continue? [y/N] " response
  case $response in
    [yY][eE][sS]|[yY])
      mv mailcow.conf mailcow.conf_backup
      chmod 600 mailcow.conf_backup
      ;;
    *)
      exit 1
    ;;
  esac
fi

echo "Press enter to confirm the detected value '[value]' where applicable or enter a custom value."
while [ -z "${MAILCOW_HOSTNAME}" ]; do
  read -p "Mail server hostname (FQDN) - this is not your mail domain, but your mail servers hostname: " -e MAILCOW_HOSTNAME
  DOTS=${MAILCOW_HOSTNAME//[^.]};
  if [ ${#DOTS} -lt 2 ] && [ ! -z ${MAILCOW_HOSTNAME} ]; then
    echo "${MAILCOW_HOSTNAME} is not a FQDN"
    MAILCOW_HOSTNAME=
  fi
done

if [ -a /etc/timezone ]; then
  DETECTED_TZ=$(cat /etc/timezone)
elif [ -a /etc/localtime ]; then
  DETECTED_TZ=$(readlink /etc/localtime|sed -n 's|^.*zoneinfo/||p')
fi

while [ -z "${MAILCOW_TZ}" ]; do
  if [ -z "${DETECTED_TZ}" ]; then
    read -p "Timezone: " -e MAILCOW_TZ
  else
    read -p "Timezone [${DETECTED_TZ}]: " -e MAILCOW_TZ
    [ -z "${MAILCOW_TZ}" ] && MAILCOW_TZ=${DETECTED_TZ}
  fi
done

MEM_TOTAL=$(awk '/MemTotal/ {print $2}' /proc/meminfo)

if [ ${MEM_TOTAL} -le "2621440" ]; then
  echo "Installed memory is <= 2.5 GiB. It is recommended to disable ClamAV to prevent out-of-memory situations."
  echo "ClamAV can be re-enabled by setting SKIP_CLAMD=n in mailcow.conf."
  read -r -p  "Do you want to disable ClamAV now? [Y/n] " response
  case $response in
    [nN][oO]|[nN])
      SKIP_CLAMD=n
      ;;
    *)
      SKIP_CLAMD=y
    ;;
  esac
else
  SKIP_CLAMD=n
fi

if [ ${MEM_TOTAL} -le "2097152" ]; then
  echo "Disabling Xapian (full text search, build in Dovecot) on low-memory system."
  SKIP_XAPIAN=y
elif [ ${MEM_TOTAL} -le "3670016" ]; then
  echo "Installed memory is <= 3.5 GiB. We suggest you to disable Xapian (full text search, build in Dovecot) to prevent out-of-memory situations."
  echo "The default Xapian heap size is 1024 MiB and should be set in mailcow.conf according to your expected load."
  echo "Xapian can be re-enabled by setting SKIP_XAPIAN=n in mailcow.conf but will refuse to start with less than 2 GB total memory."
  read -r -p  "Do you want to disable the FTS Xapian now? [Y/n] " response
  case $response in
    [nN][oO]|[nN])
      SKIP_XAPIAN=n
      ;;
    *)
      SKIP_XAPIAN=y
    ;;
  esac
else
  SKIP_XAPIAN=n
fi

[ ! -f ./data/conf/rspamd/override.d/worker-controller-password.inc ] && echo '# Placeholder' > ./data/conf/rspamd/override.d/worker-controller-password.inc

cat << EOF > mailcow.conf
# ------------------------------
# mailcow web ui configuration
# ------------------------------
# example.org is _not_ a valid hostname, use a fqdn here.
# Default admin user is "admin"
# Default password is "moohoo"

MAILCOW_HOSTNAME=${MAILCOW_HOSTNAME}

# Password hash algorithm
# Only certain password hash algorithm are supported. For a fully list of supported schemes,
# see https://mailcow.github.io/mailcow-dockerized-docs/models/model-passwd/
MAILCOW_PASS_SCHEME=BLF-CRYPT

# ------------------------------
# SQL database configuration
# ------------------------------

DBNAME=mailcow
DBUSER=mailcow

# Please use long, random alphanumeric strings (A-Za-z0-9)

DBPASS=$(LC_ALL=C </dev/urandom tr -dc A-Za-z0-9 | head -c 28)
DBROOT=$(LC_ALL=C </dev/urandom tr -dc A-Za-z0-9 | head -c 28)

# ------------------------------
# HTTP/S Bindings
# ------------------------------

# You should use HTTPS, but in case of SSL offloaded reverse proxies:
# Might be important: This will also change the binding within the container.
# If you use a proxy within Docker, point it to the ports you set below.
# Do _not_ use IP:PORT in HTTP(S)_BIND or HTTP(S)_PORT
# IMPORTANT: Do not use port 8081, 9081 or 65510!
# Example: HTTP_BIND=1.2.3.4
# For IPv4 and IPv6 leave it empty: HTTP_BIND= & HTTPS_PORT=
# For IPv6 see https://mailcow.github.io/mailcow-dockerized-docs/post_installation/firststeps-ip_bindings/

HTTP_PORT=80
HTTP_BIND=

HTTPS_PORT=443
HTTPS_BIND=

# ------------------------------
# Other bindings
# ------------------------------
# You should leave that alone
# Format: 11.22.33.44:25 or 12.34.56.78:465 etc.

SMTP_PORT=25
SMTPS_PORT=465
SUBMISSION_PORT=587
IMAP_PORT=143
IMAPS_PORT=993
POP_PORT=110
POPS_PORT=995
SIEVE_PORT=4190
DOVEADM_PORT=127.0.0.1:19991
SQL_PORT=127.0.0.1:13306
REDIS_PORT=127.0.0.1:7654

# Your timezone
# See https://en.wikipedia.org/wiki/List_of_tz_database_time_zones for a list of timezones
# Use the row named 'TZ database name' + pay attention for 'Notes' row

TZ=${MAILCOW_TZ}

# Fixed project name
# Please use lowercase letters only

COMPOSE_PROJECT_NAME=mailcowdockerized

# Set this to "allow" to enable the anyone pseudo user. Disabled by default.
# When enabled, ACL can be created, that apply to "All authenticated users"
# This should probably only be activated on mail hosts, that are used exclusivly by one organisation.
# Otherwise a user might share data with too many other users.
ACL_ANYONE=disallow

# Garbage collector cleanup
# Deleted domains and mailboxes are moved to /var/vmail/_garbage/timestamp_sanitizedstring
# How long should objects remain in the garbage until they are being deleted? (value in minutes)
# Check interval is hourly

MAILDIR_GC_TIME=7200

# Additional SAN for the certificate
#
# You can use wildcard records to create specific names for every domain you add to mailcow.
# Example: Add domains "example.com" and "example.net" to mailcow, change ADDITIONAL_SAN to a value like:
#ADDITIONAL_SAN=imap.*,smtp.*
# This will expand the certificate to "imap.example.com", "smtp.example.com", "imap.example.net", "smtp.example.net"
# plus every domain you add in the future.
#
# You can also just add static names...
#ADDITIONAL_SAN=srv1.example.net
# ...or combine wildcard and static names:
#ADDITIONAL_SAN=imap.*,srv1.example.com
#

ADDITIONAL_SAN=

# Additional server names for mailcow UI
#
# Specify alternative addresses for the mailcow UI to respond to
# This is useful when you set mail.* as ADDITIONAL_SAN and want to make sure mail.maildomain.com will always point to the mailcow UI.
# If the server name does not match a known site, Nginx decides by best-guess and may redirect users to the wrong web root.
# You can understand this as server_name directive in Nginx.
# Comma separated list without spaces! Example: ADDITIONAL_SERVER_NAMES=a.b.c,d.e.f

ADDITIONAL_SERVER_NAMES=

# Skip running ACME (acme-mailcow, Let's Encrypt certs) - y/n

SKIP_LETS_ENCRYPT=n

# Create seperate certificates for all domains - y/n
# this will allow adding more than 100 domains, but some email clients will not be able to connect with alternative hostnames
# see https://wiki.dovecot.org/SSL/SNIClientSupport
ENABLE_SSL_SNI=n

# Skip IPv4 check in ACME container - y/n

SKIP_IP_CHECK=n

# Skip HTTP verification in ACME container - y/n

SKIP_HTTP_VERIFICATION=n

# Skip ClamAV (clamd-mailcow) anti-virus (Rspamd will auto-detect a missing ClamAV container) - y/n

SKIP_CLAMD=${SKIP_CLAMD}

# Skip SOGo: Will disable SOGo integration and therefore webmail, DAV protocols and ActiveSync support (experimental, unsupported, not fully implemented) - y/n

SKIP_SOGO=n

# Skip Xapian (FTS) on low-memory systems or if you do not want to store a readable index of your mails in vmail-index-vol-1.

SKIP_XAPIAN=${SKIP_XAPIAN}

# Xapian heap size in MB, there is no recommendation, please see Xapians docs.
# Xapian is replacing solr completely. It is supposed to be much more efficient in CPU and RAM consumption.

XAPIAN_HEAP=1024

# Allow admins to log into SOGo as email user (without any password)

ALLOW_ADMIN_EMAIL_LOGIN=n

# Enable watchdog (watchdog-mailcow) to restart unhealthy containers

USE_WATCHDOG=y

# Send watchdog notifications by mail (sent from watchdog@MAILCOW_HOSTNAME)
# CAUTION:
# 1. You should use external recipients
# 2. Mails are sent unsigned (no DKIM)
# 3. If you use DMARC, create a separate DMARC policy ("v=DMARC1; p=none;" in _dmarc.MAILCOW_HOSTNAME)
# Multiple rcpts allowed, NO quotation marks, NO spaces

#WATCHDOG_NOTIFY_EMAIL=a@example.com,b@example.com,c@example.com
#WATCHDOG_NOTIFY_EMAIL=

# Notify about banned IP (includes whois lookup)
WATCHDOG_NOTIFY_BAN=n

# Subject for watchdog mails. Defaults to "Watchdog ALERT" followed by the error message.
#WATCHDOG_SUBJECT=

# Checks if mailcow is an open relay. Requires a SAL. More checks will follow.
# https://www.servercow.de/mailcow?lang=en
# https://www.servercow.de/mailcow?lang=de
# No data is collected. Opt-in and anonymous.
# Will only work with unmodified mailcow setups.
WATCHDOG_EXTERNAL_CHECKS=n

# Enable watchdog verbose logging
WATCHDOG_VERBOSE=n

# Max log lines per service to keep in Redis logs

LOG_LINES=9999

# Internal IPv4 /24 subnet, format n.n.n (expands to n.n.n.0/24)
# Use private IPv4 addresses only, see https://en.wikipedia.org/wiki/Private_network#Private_IPv4_addresses

IPV4_NETWORK=172.22.1

# Internal IPv6 subnet in fc00::/7
# Use private IPv6 addresses only, see https://en.wikipedia.org/wiki/Private_network#Private_IPv6_addresses

IPV6_NETWORK=fd4d:6169:6c63:6f77::/64

# Use this IPv4 for outgoing connections (SNAT)

#SNAT_TO_SOURCE=

# Use this IPv6 for outgoing connections (SNAT)

#SNAT6_TO_SOURCE=

# Create or override an API key for the web UI
# You _must_ define API_ALLOW_FROM, which is a comma separated list of IPs
# An API key defined as API_KEY has read-write access
# An API key defined as API_KEY_READ_ONLY has read-only access
# Allowed chars for API_KEY and API_KEY_READ_ONLY: a-z, A-Z, 0-9, -
# You can define API_KEY and/or API_KEY_READ_ONLY

#API_KEY=
#API_KEY_READ_ONLY=
#API_ALLOW_FROM=172.22.1.1,127.0.0.1

# mail_home is ~/Maildir
MAILDIR_SUB=Maildir

# SOGo session timeout in minutes
SOGO_EXPIRE_SESSION=480

# DOVECOT_MASTER_USER and DOVECOT_MASTER_PASS must both be provided. No special chars.
# Empty by default to auto-generate master user and password on start.
# User expands to DOVECOT_MASTER_USER@mailcow.local
# LEAVE EMPTY IF UNSURE
DOVECOT_MASTER_USER=
# LEAVE EMPTY IF UNSURE
DOVECOT_MASTER_PASS=

# Let's Encrypt registration contact information
# Optional: Leave empty for none
# This value is only used on first order!
# Setting it at a later point will require the following steps:
# https://mailcow.github.io/mailcow-dockerized-docs/troubleshooting/debug-reset_tls/
ACME_CONTACT=

# WebAuthn device manufacturer verification
# After setting WEBAUTHN_ONLY_TRUSTED_VENDORS=y only devices from trusted manufacturers are allowed
# root certificates can be placed for validation under mailcow-dockerized/data/web/inc/lib/WebAuthn/rootCertificates
WEBAUTHN_ONLY_TRUSTED_VENDORS=n

EOF

mkdir -p data/assets/ssl

chmod 600 mailcow.conf

# copy but don't overwrite existing certificate
echo "Generating snake-oil certificate..."
# Making Willich more popular
openssl req -x509 -newkey rsa:4096 -keyout data/assets/ssl-example/key.pem -out data/assets/ssl-example/cert.pem -days 365 -subj "/C=DE/ST=NRW/L=Willich/O=mailcow/OU=mailcow/CN=${MAILCOW_HOSTNAME}" -sha256 -nodes
echo "Copying snake-oil certificate..."
cp -n -d data/assets/ssl-example/*.pem data/assets/ssl/

# Set app_info.inc.php
mailcow_git_version=$(git describe --tags `git rev-list --tags --max-count=1`)
if [ $? -eq 0 ]; then
  mailcow_git_url=$(git config --get remote.origin.url)
  echo '<?php' > data/web/inc/app_info.inc.php
  echo '  $MAILCOW_GIT_VERSION="'$mailcow_git_version'";' >> data/web/inc/app_info.inc.php
  echo '  $MAILCOW_GIT_URL="'$mailcow_git_url'";' >> data/web/inc/app_info.inc.php
  echo '?>' >> data/web/inc/app_info.inc.php
else
  echo '<?php' > data/web/inc/app_info.inc.php
  echo '  $MAILCOW_GIT_VERSION="";' >> data/web/inc/app_info.inc.php
  echo '  $MAILCOW_GIT_URL="";' >> data/web/inc/app_info.inc.php
  echo '?>' >> data/web/inc/app_info.inc.php
  echo -e "\e[33mCannot determine current git repository version...\e[0m"
fi