#!/bin/sh

# Open Infrastructure: service-tools

# Copyright (C) 2014-2022 Daniel Baumann <daniel.baumann@open-infrastructure.net>
#
# SPDX-License-Identifier: GPL-3.0+
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

set -e

echo -n " + Creating extra certificate files..."

DIRECTORY="$(dirname "${CERTFILE}")"

if [ "$(grep -c 'BEGIN CERTIFICATE' ${FULLCHAINFILE})" -ge 3 ]
then
	# - chain.pem:     R3 | ISRG Root X1
	# - fullchain.pem: Certificate | R3 | ISRG Root X1
	CHAIN="long"
else
	# - chain.pem:     R3
	# - fullchain.pem: Certificate | R3
	CHAIN="short"
fi

case "${CHAIN}" in
	long)
		# split chain.pem
		TMPFILE="$(mktemp -p "${DIRECTORY}" -u ca.XXXXXXXXXX)"
		grep -Ev '^$' "${CHAINFILE}" | csplit -f "${TMPFILE}" -s -z - '/-----BEGIN CERTIFICATE-----/' '{*}'

		# intermediate (R3)
		mv "${TMPFILE}00" "${DIRECTORY}/intermediate-${TIMESTAMP}.pem"
		ln -sf "${DIRECTORY}/intermediate-${TIMESTAMP}.pem" "${DIRECTORY}/intermediate.pem"

		# root (ISRG Root X1)
		mv "${TMPFILE}01" "${DIRECTORY}/root-${TIMESTAMP}.pem"
		ln -sf "${DIRECTORY}/root-${TIMESTAMP}.pem" "${DIRECTORY}/root.pem"
		;;

	short)
		# intermediate (R3)
		cp "${DIRECTORY}/chain-${TIMESTAMP}.pem" "${DIRECTORY}/intermediate-${TIMESTAMP}.pem"
		ln -sf "${DIRECTORY}/intermediate-${TIMESTAMP}.pem" "${DIRECTORY}/intermediate.pem"

		# root (ISRG Root X1)
		ISSUER_URI="$(openssl x509 -in "${DIRECTORY}/chain-${TIMESTAMP}.pem" -text -noout | grep 'Authority Information Access:' -A1 | awk -FURI: '/http/ { print $2 }')"

		if [ -n "${ISSUER_URI}" ]
		then
			wget -q "${ISSUER_URI}" -O - | openssl x509 -outform PEM > "${DIRECTORY}/root-${TIMESTAMP}.pem"
			ln -sf "${DIRECTORY}/root-${TIMESTAMP}.pem" "${DIRECTORY}/root.pem"
		fi
		;;
esac

# extra certificate permutations:
#   * privkey_fullchain.pem: postfix
for EXTRA in fullchain_privkey privkey_fullchain
do
	EXTRA1="$(echo ${EXTRA} | awk -F_ '{ print $1 }')"
	EXTRA2="$(echo ${EXTRA} | awk -F_ '{ print $2 }')"

	cat "${DIRECTORY}/${EXTRA1}-${TIMESTAMP}.pem" "${DIRECTORY}/${EXTRA2}-${TIMESTAMP}.pem" > "${DIRECTORY}/${EXTRA1}_${EXTRA2}-${TIMESTAMP}.pem"
	ln -sf "${EXTRA1}_${EXTRA2}-${TIMESTAMP}.pem" "${DIRECTORY}/${EXTRA1}_${EXTRA2}.pem"
done

echo " done."