#! /bin/sh
#
# notify-by-matrix
# Copyright (C) 2021 Vintage Salt <rehashedsalt@cock.li>
#
# Distributed under terms of the MIT license.
#

set -e

# Set our Matrix-related vars here
MX_TOKEN="{{ nagios_matrix_token }}"
MX_SERVER="{{ nagios_matrix_server }}"
MX_ROOM="{{ nagios_matrix_room }}"

# Get a TXN to prefix this particular message with
MX_TXN="$(date "+%s")$(( RANDOM % 9999 ))"

# Read the first line from STDIN
# This is supposed to be the NOTIFICATIONTYPE
read notiftype
prefix=""
# https://assets.nagios.com/downloads/nagioscore/docs/nagioscore/3/en/macrolist.html#notificationtype
case "$notiftype" in
	PROBLEM)
		# Large Red Circle (U+1F534)
		prefix="🔴"
		;;
	RECOVERY)
		# Large Green Circle (U+1F7E2)
		prefix="🟢"
		;;
	ACKNOWLEDGEMENT)
		# Symbol For Acknowledge (U+2406)
		prefix="␆"
		;;
	FLAPPINGSTART)
		# Large Orange Circle (U+1F7E0)
		prefix="🟠"
		;;
	FLAPPINGSTOP)
		# Large Green Circle (U+1F7E2)
		prefix="🟢"
		;;
	FLAPPINGDISABLED)
		# Bell with Cancellation Stroke (U+1F515)
		prefix="🔕"
		;;
	DOWNTIMESTART)
		# Bell with Cancellation Stroke (U+1F515)
		prefix="🔕"
		;;
	DOWNTIMEEND)
		# Bell (U+1F514)
		prefix="🔔"
		;;
	DOWNTIMECANCELLED)
		# Bell (U+1F514)
		prefix="🔔"
		;;
	*)
		prefix="$notiftype - "
		;;
esac

# Read a message from STDIN
# NOTE: This is dangerous and stupid and unsanitized
read message
while read line; do
	message="${message}\n${line}"
done

# Push it to the channel
curl -X PUT \
	--header 'Content-Type: application/json' \
	--header 'Accept: application/json' \
	-d "{
		\"msgtype\": \"m.text\",
		\"body\": \"$prefix $message\"
	}" \
	"$MX_SERVER/_matrix/client/unstable/rooms/$MX_ROOM/send/m.room.message/$MX_TXN?access_token=$MX_TOKEN"