#!/bin/sh

set -e

. /usr/share/debconf/confmodule

CONFFILE="/etc/network-tools/config/ddns-client.conf"

case "${1}" in
	configure)
		db_get open-infrastructure-ddns-client/nameservers
		NAMESERVERS="${RET}" # string

		db_get open-infrastructure-ddns-client/zone
		ZONE="${RET}" # string

		db_get open-infrastructure-ddns-client/record
		RECORD="${RET}" # string

		db_get open-infrastructure-ddns-client/ttl
		TTL="${RET:-60}" # string (w/o empty)

		db_get open-infrastructure-ddns-client/tsig
		TSIG="${RET}" # string (w/ empty)

		db_stop

		if [ ! -e "${CONFFILE}" ]
		then
			mkdir -p /etc/network-tools/config

cat > "${CONFFILE}" << EOF
# /etc/network-tools/config/ddns-client.conf

NAMESERVERS="${NAMESERVERS}"
ZONE="${ZONE}"
RECORD="${RECORD}"
TTL="${TTL}"
TSIG_KEYFILE=""
EOF

		fi

		cp -a -f "${CONFFILE}" "${CONFFILE}.tmp"

		# If the admin deleted or commented some variables but then set
		# them via debconf, (re-)add them to the config file.

		test -z "${NAMESERVERS}" || \
		grep -Eq '^ *NAMESERVERS=' "${CONFFILE}" || \
		echo "NAMESERVERS=" >> "${CONFFILE}"

		test -z "${ZONE}" || \
		grep -Eq '^ *ZONE=' "${CONFFILE}" || \
		echo "ZONE=" >> "${CONFFILE}"

		test -z "${RECORD}" || \
		grep -Eq '^ *RECORD=' "${CONFFILE}" || \
		echo "RECORD=" >> "${CONFFILE}"

		test -z "${TTL}" || \
		grep -Eq '^ *TTL=' "${CONFFILE}" || \
		echo "TTL=" >> "${CONFFILE}"

		sed -e "s|^ *NAMESERVERS=.*|NAMESERVERS=\"${NAMESERVERS}\"|" \
		    -e "s|^ *ZONE=.*|ZONE=\"${ZONE}\"|" \
		    -e "s|^ *RECORD=.*|RECORD=\"${RECORD}\"|" \
		    -e "s|^ *TTL=.*|TTL=\"${TTL}\"|" \
		< "${CONFFILE}" > "${CONFFILE}.tmp"

		mv -f "${CONFFILE}.tmp" "${CONFFILE}"

		if [ -n "${TSIG}" ]
		then
			case "${TSIG}" in
				http*)
					# tsig is a URL
					if command -v wget "${TSIG}" -O /dev/null > /dev/null 2>&1
					then
						rm -f /etc/network-tools/tsig.key

						wget "${TSIG}" -O /etc/network-tools/tsig.key
						chmod 0600 /etc/network-tools/tsig.key

						TSIG_FILE="/etc/network-tools/tsig.key"
					elif command -v curl "${TSIG}" -o /dev/null > /dev/null 2>&1
					then
						rm -f /etc/network-tools/tsig.key

						curl "${TSIG}" -o /etc/network-tools/tsig.key
						chmod 0600 /etc/network-tools/tsig.key

						TSIG_FILE="/etc/network-tools/tsig.key"
					fi
					;;

				*:*)
					# tsig is a string
					echo "${TSIG}" > /etc/network-tools/tsig.key
					chmod 0600 /etc/network-tools/tsig.key

					TSIG_FILE="/etc/network-tools/tsig.key"
					;;

				*/*)
					# tsig is a path
					TSIG_FILE="${TSIG}"
					;;

				*)
					echo "'${TSIG}' is neither a valid tsig, nor a path or URL to an existing file - ignoring"
					;;
			esac
		fi

		if [ -n "${TSIG_FILE}" ]
		then
			cp -a -f "${CONFFILE}" "${CONFFILE}.tmp"

			# If the admin deleted or commented some variables but then set
			# them via debconf, (re-)add them to the config file.

			test -z "${TSIG_FILE}" || \
			grep -Eq '^ *TSIG_KEYFILE=' "${CONFFILE}" || \
			echo "TSIG_KEYFILE=" >> "${CONFFILE}"

			sed -e "s|^ *TSIG_KEYFILE=.*|TSIG_KEYFILE=\"${TSIG_FILE}\"|" \
			< "${CONFFILE}" > "${CONFFILE}.tmp"

			mv -f "${CONFFILE}.tmp" "${CONFFILE}"
		fi
		;;

	abort-upgrade|abort-remove|abort-deconfigure)

		;;

	*)
		echo "postinst called with unknown argument \`${1}'" >&2
		exit 1
		;;
esac

#DEBHELPER#

exit 0