#!/bin/sh

set -e

. /usr/share/debconf/confmodule

CONFFILE="/etc/dehydrated/conf.d/config.sh"

Install ()
{
	DEFAULT="${1}"
	TARGET="${2}"

	mkdir -p "${DEFAULT}" > /dev/null 2>&1 || true
	mkdir -p "${TARGET}" > /dev/null 2>&1 || true

	if [ "${TARGET}" != "${DEFAULT}" ]
	then
		if [ -h "${DEFAULT}" ]
		then
			rm -f "${DEFAULT}"
			ln -s "${TARGET}" "${DEFAULT}"
		else
			if [ -e "${DEFAULT}" ] && [ -z "$(ls -A ${DEFAULT})" ]
			then
				rmdir "${DEFAULT}"
				ln -s "${TARGET}" "${DEFAULT}"
			elif [ -n "$(ls -A ${DEFAULT})" ] && [ -z "$(ls -A ${TARGET})" ]
			then
				rmdir "${TARGET}"
				mv "${DEFAULT}" "${TARGET}"
				ln -s "${TARGET}" "${DEFAULT}"
			fi
		fi
	fi

	if ! dpkg-statoverride --list "${DEFAULT}" > /dev/null 2>&1 &&
	   ! dpkg-statoverride --list "${TARGET}" > /dev/null 2>&1
	then
		if getent group ssl-cert > /dev/null 2>&1
		then
			GROUP="ssl-cert"
		else
			GROUP="root"
		fi

		chmod 0770 "${TARGET}"
		chown root:"${GROUP}" "${TARGET}"

		chmod 0770 "${DEFAULT}"
		chown root:"${GROUP}" "${DEFAULT}"
	fi
}

case "${1}" in
	configure)
		db_get open-infrastructure-dehydrated-tools/ca
		CA="${RET}" # select

		db_get open-infrastructure-dehydrated-tools/auto-cleanup
		AUTO_CLEANUP="${RET}" # boolean

		db_get open-infrastructure-dehydrated-tools/challengetype
		CHALLENGETYPE="${RET}" # select

		db_get open-infrastructure-dehydrated-tools/contact-email
		CONTACT_EMAIL="${RET}" # string (w/ empty)

		db_get open-infrastructure-dehydrated-tools/key-algo
		KEY_ALGO="${RET}" # select

		db_get open-infrastructure-dehydrated-tools/ocsp-fetch
		OCSP_FETCH="${RET}" # boolean

		db_get open-infrastructure-dehydrated-tools/ocsp-must-staple
		OCSP_MUST_STAPLE="${RET}" # boolean

		db_get open-infrastructure-dehydrated-tools/preferred-chain
		PREFERRED_CHAIN="${RET}" # string w/ empty

		db_get open-infrastructure-dehydrated-tools/hooks
		HOOKS="${RET}" # multi-select (w/ empty)

		db_get open-infrastructure-dehydrated-tools/basedir
		NEW_BASEDIR="${RET}" # string (w/o empty)

		db_get open-infrastructure-dehydrated-tools/domains
		DOMAINS="${RET}" # string (w/ empty)

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

		db_get open-infrastructure-dehydrated-tools/register
		REGISTER="${RET}" # boolean

		db_get open-infrastructure-dehydrated-tools/run
		RUN="${RET}" # boolean

		db_stop

		case "${AUTO_CLEANUP}" in
			true)
				AUTO_CLEANUP="yes"
				;;

			false)
				AUTO_CLEANUP="no"
				;;
		esac

		case "${OCSP_FETCH}" in
			true)
				OCSP_FETCH="yes"
				;;

			false)
				OCSP_FETCH="no"
				;;
		esac

		case "${OCSP_MUST_STAPLE}" in
			true)
				OCSP_MUST_STAPLE="yes"
				;;

			false)
				OCSP_MUST_STAPLE="no"
				;;
		esac

		HOOK="/usr/bin/dehydrated-hook"

		if [ ! -e "${CONFFILE}" ]
		then

cat > "${CONFFILE}" << EOF
# /etc/dehydrated/conf.d/config.sh

AUTO_CLEANUP="${AUTO_CLEANUP}"
CA="${CA}"
CHALLENGETYPE="${CHALLENGETYPE}"
CONTACT_EMAIL="${CONTACT_EMAIL}"
HOOK="${HOOK}"
KEY_ALGO="${KEY_ALGO}"
OCSP_FETCH="${OCSP_FETCH}"
OCSP_MUST_STAPLE="${OCSP_MUST_STAPLE}"
PREFERRED_CHAIN="${PREFERRED_CHAIN}"
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 "${AUTO_CLEANUP}" || \
		grep -Eq '^ *AUTO_CLEANUP=' "${CONFFILE}" || \
		echo "AUTO_CLEANUP=" >> "${CONFFILE}"

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

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

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

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

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

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

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

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

		sed -e "s|^ *AUTO_CLEANUP=.*|AUTO_CLEANUP=\"${AUTO_CLEANUP}\"|" \
		    -e "s|^ *CA=.*|CA=\"${CA}\"|" \
		    -e "s|^ *CHALLENGETYPE=.*|CHALLENGETYPE=\"${CHALLENGETYPE}\"|" \
		    -e "s|^ *CONTACT_EMAIL=.*|CONTACT_EMAIL=\"${CONTACT_EMAIL}\"|" \
		    -e "s|^ *HOOK=.*|HOOK=\"${HOOK}\"|" \
		    -e "s|^ *KEY_ALGO=.*|KEY_ALGO=\"${KEY_ALGO}\"|" \
		    -e "s|^ *OCSP_FETCH=.*|OCSP_FETCH=\"${OCSP_FETCH}\"|" \
		    -e "s|^ *OCSP_MUST_STAPLE=.*|OCSP_MUST_STAPLE=\"${OCSP_MUST_STAPLE}\"|" \
		    -e "s|^ *PREFERRED_CHAIN=.*|PREFERRED_CHAIN=\"${PREFERRED_CHAIN}\"|" \
		< "${CONFFILE}" > "${CONFFILE}.tmp"

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

		for HOOK in $(cd /usr/share/dehydrated/hooks && find -maxdepth 1 -not -type d -printf '%P\n' | sort)
		do
			if [ -L "/etc/dehydrated/hook.d/${HOOK}" ]
			then
				rm -f "/etc/dehydrated/hook.d/${HOOK}"
			fi
		done

		if [ -n "${HOOKS}" ]
		then
			HOOKS="$(echo ${HOOKS} | sed -e 's|,| |g')"

			if echo "${HOOKS}" | grep -qs "ALL"
			then
				HOOKS="$(cd /usr/share/dehydrated/hooks && find -maxdepth 1 -not -type d -printf '%P\n' | sort)"
			fi

			for HOOK in ${HOOKS}
			do
				if [ ! -e "/etc/dehydrated/hook.d/${HOOK}" ] && [ -e "/usr/share/dehydrated/hooks/${HOOK}" ]
				then
					ln -sf "/usr/share/dehydrated/hooks/${HOOK}" "/etc/dehydrated/hook.d/${HOOK}"
				fi
			done
		fi

		for FILE in /etc/dehydrated/config /etc/dehydrated/conf.d/*.sh
		do
			if [ -e "${FILE}" ]
			then
				. ${FILE} || true
			fi
		done

		if [ -n "${NEW_BASEDIR}" ] && [ "${BASEDIR}" != "${NEW_BASEDIR}" ]
		then
			rmdir "${BASEDIR}/acme-challenges" > /dev/null 2>&1 || true
			Install "${BASEDIR}" "${NEW_BASEDIR}"
			mkdir -p "${BASEDIR}/acme-challenges"
		fi

		if [ -n "${DOMAINS}" ] && [ "${DOMAINS}" != "none" ]
		then
			rm -f /etc/dehydrated/domains.txt

			GROUPS="$(echo ${DOMAINS} | sed -e 's/ /#/g' -e 's/|/ /g')"

			for GROUP in ${GROUPS}
			do
				DOMAINS="$(echo ${GROUP} | sed -e 's/#/ /g' -e 's/^ //g')"

				echo "${DOMAINS}" >> /etc/dehydrated/domains.txt
			done
		fi

		if [ -n "${TSIG}" ]
		then
			case "${TSIG}" in
				http*)
					# tsig is a URL
					echo -n "Downloading tsig.key from '${TSIG}'..."

					if command -v wget -q "${TSIG}" -O /dev/null > /dev/null 2>&1
					then
						rm -f /etc/dehydrated/tsig.key

						wget -q "${TSIG}" -O /etc/dehydrated/tsig.key
						chmod 0600 /etc/dehydrated/tsig.key

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

						curl -s "${TSIG}" -o /etc/dehydrated/tsig.key
						chmod 0600 /etc/dehydrated/tsig.key

						TSIG_FILE="/etc/dehydrated/tsig.key"
					else
						echo
						echo "W: need wget or curl" >&2
					fi

					if [ -n "${TSIG_FILE}" ]
					then
						echo " done."
					fi
					;;

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

					TSIG_FILE="/etc/dehydrated/tsig.key"
					;;

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

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

		if [ -n "${TSIG_FILE}" ]
		then
			DEFAULT_FILE="/etc/default/dehydrated-nsupdate"

			if [ ! -e "${DEFAULT_FILE}" ]
			then

cat > "${DEFAULT_FILE}" << EOF
# ${DEFAULT_FILE}

TSIG_KEYFILE="${TSIG_FILE}"
EOF

			fi

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

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

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

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

			mv -f "${DEFAULT_FILE}.tmp" "${DEFAULT_FILE}"
		fi

		case "${REGISTER}" in
			true)
				dehydrated --register --accept-terms
				;;
		esac

		case "${RUN}" in
			true)
				dehydrated --cron --keep-going
				;;
		esac

		;;

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

		;;

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

#DEBHELPER#

exit 0