#!/bin/sh -e
#
# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
# 2020 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist 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.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#

quote() {
	if test $# -gt 0
	then
		printf '%s' "$*"
	else
		cat -
	fi | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/'/"
}

case $(cat "${__global:?}/explorer/os")
in
	(netbsd)
		postgres_user='pgsql'
		;;
	(openbsd)
		postgres_user='_postgresql'
		;;
	(*)
		postgres_user='postgres'
		;;
esac


rolename=${__object_id:?}
state_is=$(cat "${__object:?}/explorer/state")
state_should=$(cat "${__object:?}/parameter/state")

if test "${state_is}" = "${state_should}"
then
	exit 0
fi

psql_query() {
	printf 'su -l %s -c %s\n' \
		"$(quote "${postgres_user}")" \
		"$(quote "psql postgres -q -w -c $(quote "$1")")"
}

psql_set_password() {
	# NOTE: Always make sure that the password does not end up in psql_history!
	# NOTE: Never set an empty string as the password, because they can be
	#       interpreted differently by different tooling.
	if test -s "${__object:?}/parameter/password"
	then
		cat <<-EOF
		exec 3< "\${__object:?}/parameter/password"
		su -l '${postgres_user}' -c 'psql -q -w postgres' <<'SQL'
		\set HISTFILE /dev/null
		\set pw \`cat <&3\`
		ALTER ROLE "${rolename}" WITH PASSWORD :'pw';
		SQL
		exec 3<&-
		EOF
	else
		psql_query "ALTER ROLE \"${rolename}\" WITH PASSWORD NULL;"
	fi
}

role_properties_should() {
	_props=
	for _prop in login createdb createrole superuser
	do
		_props="${_props}${_props:+ }$(
			if test -f "${__object:?}/parameter/${_prop}"
			then
				echo "${_prop}"
			else
				echo "no${_prop}"
			fi \
			| tr '[:lower:]' '[:upper:]')"
	done
	printf '%s\n' "${_props}"
	unset _prop _props
}

case ${state_should}
in
	(present)
		case ${state_is}
		in
			(absent)
				psql_query "CREATE ROLE \"${rolename}\" WITH $(role_properties_should);"
				psql_set_password
				;;
			(different*)
				if expr "${state_is}" : 'different.*properties' >/dev/null
				then
					psql_query "ALTER ROLE \"${rolename}\" WITH $(role_properties_should);"
				fi

				if expr "${state_is}" : 'different.*password' >/dev/null
				then
					psql_set_password
				fi
				;;
			(*)
				printf 'Invalid state reported by state explorer: %s\n' "${state_is}" >&2
				exit 1
				;;
		esac
		;;
	(absent)
		printf 'su -l %s -c %s\n' \
			"$(quote "${postgres_user}")" \
			"$(quote "dropuser $(quote "${rolename}")")"
		;;
esac
