ejabberd 18.01-2 / config

#!/bin/sh

set -e

get_passwd()
{
	db_get ejabberd/user
	if [ -n "$RET" ]; then
		db_input medium ejabberd/password || true
		db_input medium ejabberd/verify || true
		db_go || true
		db_get ejabberd/password
		PASSWORD="$RET"
		db_get ejabberd/verify
		VERIFY="$RET"
		if [ -z "$PASSWORD" ] || [ "$PASSWORD" != "$VERIFY" ]; then
			db_input medium ejabberd/nomatch || true
			db_go || true
			get_passwd
		fi
	fi
}

validate_hostname()
{
	HOST="$1"
	if [ -z "$HOST" ] || echo "$HOST" | grep -Evq '(^[a-z0-9]+$)|^([a-z0-9]*\.)+([a-z0-9]|[a-z0-9][a-z0-9_-]*[a-z0-9]\.)*([a-z0-9]+)$'; then
		echo 1
	else
		echo 0
	fi
}

get_hostname()
{
	# If there is no hostname registered in the debconf database (new install)
	# or if invoked by dpkg-reconfigure
	db_get ejabberd/hostname
	if [ -z "$RET" ] || [ -z "$2" ] || ( [ -n "$RET" ] && [ "$1" = "reconfigure" ] ); then
		db_input medium ejabberd/hostname || true
		db_go || true

		db_get ejabberd/hostname
		# Convert hostname to lowercase if user entered in uppercase alphabets,
		# save it back to the debconf database, and read it back
		db_set ejabberd/hostname "$(echo "$RET" | sed -e 's/\(.*\)/\L\1/')" && \
			db_get ejabberd/hostname && \
			HOST="$RET"

		# Check hostname for invalid characters
		# If there were invalid characters, show error and ask again
		# Check for .postinst.flag as well - it means that the upgrade
		# failed. If so, we don't want to force a user to change config
		if [ "$(validate_hostname "$HOST")" != 0 ] && [ ! -f /var/lib/ejabberd/.postinst.flag ]; then
			db_reset ejabberd/hostname
			db_input medium ejabberd/invalidhostname || true
			db_go || true
			get_hostname "$1" "$2"
		fi
	# If this is an upgrade but the previous values of hostname registerd in
	# debconf database are invalid according to the validation standards at the
	# time of writing, we show a warning to the user if it hasn't been shown
	# already and continue the upgrade
	elif [ -n "$RET" ] && [ "$(validate_hostname "$RET")" != 0 ] && [ -n "$2" ]; then
		if [ ! -f /var/lib/ejabberd/.invalid_hostname_reported ]; then
			db_subst ejabberd/invalidpreseed preseed "hostname"
			db_input medium ejabberd/invalidpreseed || true
			db_go || true
			touch /var/lib/ejabberd/.invalid_hostname_reported && chmod 644 /var/lib/ejabberd/.invalid_hostname_reported
		fi
	fi
}

validate_username()
{
	USER="$1"
	if [ -z "$USER" ] || echo "$USER" | grep -Evq '^[[:alnum:]_\.-]+$'; then
		echo 1
	else
		echo 0
	fi
}

get_username()
{
	db_get ejabberd/hostname
	HOST="$RET"
	db_get ejabberd/user
	USER="$RET"

	# If there is no username registered in the debconf database (new install)
	# or if invoked by dpkg-reconfigure
	if [ -z "$USER" ] || [ -z "$2" ] || ( [ -n "$USER" ] && [ "$1" = "reconfigure" ] ); then
		db_input medium ejabberd/user || true
		db_go || true

		db_get ejabberd/user

		# If username is not empty, check it for invalid characters
		if [ -n "$RET" ]; then
			# Strip the hostname if user entered it as a JID
			USER=$(echo "$RET" | sed -e "s/\(.*\)@$HOST/\1/")
			db_set ejabberd/user "$USER"

			# Check for invalid characters
			# Check for .postinst.flag as well - it means that the upgrade
			# failed. If so, we don't want to force a user to change config
			if [ "$(validate_username "$USER")" != 0 ] && [ ! -f /var/lib/ejabberd/.postinst.flag ]; then
				db_reset ejabberd/user
				db_reset ejabberd/password
				db_reset ejabberd/verify
				db_input medium ejabberd/invaliduser || true
				db_go || true
				get_username "$1" "$2"
			fi
		fi
	# If this is an upgrade but the previous values of username registerd in
	# debconf database are invalid according to the validation standards at the
	# time of writing, we show a warning to the user if we haven't already
	# and continue the upgrade
	elif [ -n "$RET" ] && [ "$(validate_username "$USER")" != 0 ] && [ -n "$2" ]; then
		if [ ! -f /var/lib/ejabberd/.invalid_username_reported ]; then
			db_subst ejabberd/invalidpreseed preseed "username"
			db_input medium ejabberd/invalidpreseed || true
			db_go || true
			touch /var/lib/ejabberd/.invalid_username_reported && chmod 644 /var/lib/ejabberd/.invalid_username_reported
		fi
	fi
}

get_credentials()
{
	db_get ejabberd/user
	USER=${RET:-admin}
	db_subst ejabberd/user user "$USER"
	db_get ejabberd/hostname
	HOST=${RET:-hostname}
	db_subst ejabberd/user hostname "$HOST"

	get_username "$1" "$2"
	get_passwd
}

get_erlang_options() {
	db_get ejabberd/erlangopts

	db_input medium ejabberd/erlangopts || true
	db_go || true
	db_get ejabberd/erlangopts
}

# Source debconf library.
. /usr/share/debconf/confmodule

# https://manpages.debian.org/unstable/debconf-doc/debconf-devel.7.en.html#THE_CONFIG_SCRIPT
# $1 - configure/reconfigure
# $2 - version number
action="$1"
previous_version="$2"

get_hostname "$action" "$previous_version"

FLAG="/var/lib/ejabberd/.admin_registered"
if [ ! -f $FLAG ]; then
	get_credentials "$action" "$previous_version"
fi

get_erlang_options "$action" "$previous_version"

# If the config has an old node configuration (pre ejabberd/nodenamechanges),
# use a flag so that debian/config may alert the user of a change and how to
# deal with the change
# Here, the nodename changes were introduced in 17.08
# If the nodename was modified by the user, show it as a medium priority rather
#   than a high priority
nodenamechanges_shown="$(debconf-show ejabberd | grep -E 'ejabberd/nodenamechanges' | sed 's/.//2g')"
if [ -n "$2" ] && dpkg --compare-versions "$2" lt 17.08; then
	if [ -z "$nodenamechanges_shown" ] || [ "$nodenamechanges_shown" != "*" ]; then
		priority=""
		if grep -Eq '^#?ERLANG_NODE=ejabberd$' /etc/default/ejabberd; then
			priority="high"
		else
			priority="medium"
		fi
		db_input "$priority" ejabberd/nodenamechanges || true
		db_go || true
	fi
fi

exit 0