#!/bin/bash
# This is the entry point for configuring the system.
#####################################################

source setup/functions.sh # load our functions

# Check system setup: Are we running as root on Ubuntu 18.04 on a
# machine with enough memory? Is /tmp mounted with exec.
# If not, this shows an error and exits.
source setup/preflight.sh

# Ensure Python reads/writes files in UTF-8. If the machine
# triggers some other locale in Python, like ASCII encoding,
# Python may not be able to read/write files. This is also
# in the management daemon startup script and the cron script.

if ! locale -a | grep en_US.utf8 >/dev/null; then
	# Generate locale if not exists
	hide_output locale-gen en_US.UTF-8
fi

export LANGUAGE=en_US.UTF-8
export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8
export LC_TYPE=en_US.UTF-8

# Fix so line drawing characters are shown correctly in Putty on Windows. See #744.
export NCURSES_NO_UTF8_ACS=1

# Recall the last settings used if we're running this a second time.
if [ -f /etc/mailinabox.conf ]; then
	# Run any system migrations before proceeding. Since this is a second run,
	# we assume we have Python already installed.
	setup/migrate.py --migrate || exit 1

	# Load the old .conf file to get existing configuration options loaded
	# into variables with a DEFAULT_ prefix.
	cat /etc/mailinabox.conf | sed s/^/DEFAULT_/ >/tmp/mailinabox.prev.conf
	source /tmp/mailinabox.prev.conf
	rm -f /tmp/mailinabox.prev.conf

	# Since this is a second run, attempt to read overridden settings from $STORAGE_ROOT/mailinabox.conf
	if [ -f $DEFAULT_STORAGE_ROOT/mailinabox.conf ]; then
		cat $DEFAULT_STORAGE_ROOT/mailinabox.conf | sed s/^/DEFAULT_/ >/tmp/mailinabox.prev.conf
		source /tmp/mailinabox.prev.conf
		rm -f /tmp/mailinabox.prev.conf
	fi
else
	FIRST_TIME_SETUP=1
fi

# Put a start script in a global location. We tell the user to run 'mailinabox'
# in the first dialog prompt, so we should do this before that starts.
cat >/usr/local/bin/mailinabox <<EOF
#!/bin/bash
cd $PWD
source setup/start.sh
EOF
chmod +x /usr/local/bin/mailinabox

# Ask the user for the PRIMARY_HOSTNAME, PUBLIC_IP, and PUBLIC_IPV6,
# if values have not already been set in environment variables. When running
# non-interactively, be sure to set values for all! Also sets STORAGE_USER and
# STORAGE_ROOT.
source setup/questions.sh

# Run some network checks to make sure setup on this machine makes sense.
# Skip on existing installs since we don't want this to block the ability to
# upgrade, and these checks are also in the control panel status checks.
if [ -z "${DEFAULT_PRIMARY_HOSTNAME:-}" ]; then
	if [ -z "${SKIP_NETWORK_CHECKS:-}" ]; then
		source setup/network-checks.sh
	fi
fi

# Create the STORAGE_USER and STORAGE_ROOT directory if they don't already exist.
#
# Set the directory and all of its parent directories' permissions to world
# readable since it holds files owned by different processes.
#
# If the STORAGE_ROOT is missing the mailinabox.version file that lists a
# migration (schema) number for the files stored there, assume this is a fresh
# installation to that directory and write the file to contain the current
# migration number for this version of Mail-in-a-Box.
if ! id -u "$STORAGE_USER" >/dev/null 2>&1; then
	useradd -m "$STORAGE_USER"
fi
if [ ! -d "$STORAGE_ROOT" ]; then
	mkdir -p "$STORAGE_ROOT"
fi
f=$STORAGE_ROOT
while [[ $f != / ]]; do
	chmod a+rx "$f"
	f=$(dirname "$f")
done
if [ ! -f "$STORAGE_ROOT/mailinabox.version" ]; then
	setup/migrate.py --current >"$STORAGE_ROOT/mailinabox.version"
	chown "$STORAGE_USER:$STORAGE_USER" "$STORAGE_ROOT/mailinabox.version"
fi

# Save the global options in /etc/mailinabox.conf so that standalone
# tools know where to look for data. The default MTA_STS_MODE setting
# is blank unless set by an environment variable, but see web.sh for
# how that is interpreted.
cat >/etc/mailinabox.conf <<EOF
STORAGE_USER=$STORAGE_USER
STORAGE_ROOT=$STORAGE_ROOT
PRIMARY_HOSTNAME=$PRIMARY_HOSTNAME
PUBLIC_IP=$PUBLIC_IP
PUBLIC_IPV6=$PUBLIC_IPV6
PRIVATE_IP=$PRIVATE_IP
PRIVATE_IPV6=$PRIVATE_IPV6
MTA_STS_MODE=${DEFAULT_MTA_STS_MODE:-enforce}
EOF

# Start service configuration.
source setup/system.sh
source setup/ssl.sh
source setup/dns.sh
source setup/mail-postfix.sh
source setup/mail-dovecot.sh
source setup/mail-users.sh
source setup/dkim.sh
source setup/spamassassin.sh
source setup/web.sh
source setup/webmail.sh
source setup/nextcloud.sh
source setup/zpush.sh
source setup/management.sh
source setup/munin.sh

# Wait for the management daemon to start...
until nc -z -w 4 127.0.0.1 10222; do
	echo "Waiting for the Mail-in-a-Box management daemon to start..."
	sleep 2
done

# ...and then have it write the DNS and nginx configuration files and start those
# services.
tools/dns_update
tools/web_update

# Give fail2ban another restart. The log files may not all have been present when
# fail2ban was first configured, but they should exist now.
restart_service fail2ban

# If there aren't any mail users yet, create one.
source setup/firstuser.sh

# Register with Let's Encrypt, including agreeing to the Terms of Service.
# We'd let certbot ask the user interactively, but when this script is
# run in the recommended curl-pipe-to-bash method there is no TTY and
# certbot will fail if it tries to ask.
if [ ! -d "$STORAGE_ROOT/ssl/lets_encrypt/accounts/acme-v02.api.letsencrypt.org/" ]; then
	echo
	echo "-----------------------------------------------"
	echo "Mail-in-a-Box uses Let's Encrypt to provision free SSL/TLS certificates"
	echo "to enable HTTPS connections to your box. We're automatically"
	echo "agreeing you to their subscriber agreement. See https://letsencrypt.org."
	echo
	certbot register --register-unsafely-without-email --agree-tos --config-dir "$STORAGE_ROOT/ssl/lets_encrypt"
fi

# Done.
echo
echo "-----------------------------------------------"
echo
echo "Your Mail-in-a-Box is running."
echo
echo "Please log in to the control panel for further instructions at:"
echo
if management/status_checks.py --check-primary-hostname; then
	# Show the nice URL if it appears to be resolving and has a valid certificate.
	echo "https://$PRIMARY_HOSTNAME/admin"
	echo
	echo "If you have a DNS problem put the box's IP address in the URL"
	echo "(https://$PUBLIC_IP/admin) but then check the TLS fingerprint:"
	openssl x509 -in "$STORAGE_ROOT/ssl/ssl_certificate.pem" -noout -fingerprint -sha256 | sed "s/SHA256 Fingerprint=//i"
else
	echo "https://$PUBLIC_IP/admin"
	echo
	echo "You will be alerted that the website has an invalid certificate. Check that"
	echo "the certificate fingerprint matches:"
	echo
	openssl x509 -in "$STORAGE_ROOT/ssl/ssl_certificate.pem" -noout -fingerprint -sha256 | sed "s/SHA256 Fingerprint=//i"
	echo
	echo "Then you can confirm the security exception and continue."
	echo
fi