Bash script to send notifications from Nagios to MS Teams

nagios-teams.sh

#!/bin/bash
#
# It is what it is.  Might be some better ways to do some things, but
# I never claimed to be a proficient at shell scripts.
#
# Enjoy.
# 

NAGIOS_URL="undefined"
WEBHOOK_URL="undefined"

usage() { echo "Usage: $0 -w <WEBHOOK_URL> -h <NAGIOS_URL>" 1>&2; exit 1; }

while getopts ":h:w:t" o; do
	case "${o}" in
		w)
			WEBHOOK_URL=${OPTARG}
			;;
		h)
			NAGIOS_URL=${OPTARG}
			;;
		t)
			TEST_MODE=1
			;;
		*)
			usage
			;;
	esac
done

# Declare some colors to use.

declare -A THEME

THEME[ACK]="0275d8"
THEME[OK]="5cb85c"
THEME[WARNING]="f0ad4e"
THEME[UNKNOWN]="f7f7f7"
THEME[CRITICAL]="d9534f"
THEME[UP]="5cb85c"
THEME[DOWN]="d9534f"
THEME[UNREACHABLE]="f7f7f7"

# Move some informatino around in case this is a host alert

if [ -z ${NAGIOS_SERVICESTATE} ]; then
	NAGIOS_SERVICEDESC="Host Status"
	NAGIOS_SERVICESTATE="${NAGIOS_HOSTSTATE}"
	NAGIOS_SERVICEOUTPUT="${NAGIOS_HOSTOUTPUT}"
	NAGIOS_SERVICEINFOURL="${NAGIOS_HOSTINFOURL}"
fi

# Don't know enough to even comment on this, but it works.

if [ -z ${NAGIOS_SERVICEINFOURL} ]; then
	NAGIOS_SERVICEINFOURL="${NAGIOS_URL}/nagios/"
fi

# I don't need this, but you might...

if [ -z ${NAGIOS_HOSTALIAS} ]; then
	NAGIOS_HOSTALIAS="${NAGIOS_HOSTNAME}"
fi

# The whole reason I wrote this, was to handle Ack notices.  The
# perl script I was using didn't do ACks for some reason.

echo "TYPE: ${NAGIOS_NOTIFICATIONTYPE}"

if [ ${NAGIOS_NOTIFICATIONTYPE} == "ACKNOWLEDGEMENT" ]; then
	COLOR=${THEME[ACK]}
	NAGIOS_NOTIFICATIONTYPE="ACK"
else
	COLOR=${THEME[${NAGIOS_SERVICESTATE}]}
	NAGIOS_NOTIFICATIONTYPE=${NAGIOS_SERVICESTATE}
fi


TITLE="${NAGIOS_NOTIFICATIONTYPE} - ${NAGIOS_HOSTALIAS} / ${NAGIOS_SERVICEDESC}"
TEXT="${NAGIOS_SERVICESTATE} - ${NAGIOS_SERVICEOUTPUT}"

FACTS="{\"name\":\"Host Address\",\"value\":\"${NAGIOS_HOSTADDRESS}\"}"

# Add some more facts...
#
# FACTS="${FACTS},{\"name\":\"Host Address\",\"value\":\"${NAGIOS_HOSTADDRESS}\"}"
#

SECTIONS="\"sections\":[{\"facts\":[${FACTS}]}]"

# Create some buttons.  You can only have 4 I think.
#
# I'm using Apache's Redirect directive so that I can make URI's that point
# to things that MS doesn't like.
#
# 	Redirect RedirectMatch "^/ssh/(.+)" "ssh://$1"
#	RedirectMatch "^/https/(.+)" "https://$1"
#

BUTTONS="{\"@type\":\"OpenUri\",\"name\":\"View in Nagios\",\"targets\":[{\"os\":\"default\",\"uri\":\"${NAGIOS_SERVICEINFOURL}\"}]}"
BUTTONS="${BUTTONS},{\"@type\":\"OpenUri\",\"name\":\"Host WebUI\",\"targets\":[{\"os\":\"default\",\"uri\":\"${NAGIOS_URL}/https/${NAGIOS_HOSTADDRESS}\"}]}"
BUTTONS="${BUTTONS},{\"@type\":\"OpenUri\",\"name\":\"Host SSH\",\"targets\":[{\"os\":\"default\",\"uri\":\"${NAGIOS_URL}/ssh/${NAGIOS_HOSTADDRESS}\"}]}"

ACTIONS="\"potentialAction\":[${BUTTONS}]"

# Convert formating.
MESSAGE=$( echo "${TEXT}" | sed 's/"/\"/g' | sed "s/'/\'/g" )

# Create the JSON blob
JSON="{\"Summary\":\"${TITLE}\",\"title\":\"${TITLE}\",\"text\":\"${MESSAGE}\",\"themeColor\":\"${COLOR}\",${SECTIONS},${ACTIONS}}"

# Post to Microsoft Teams.

echo "${JSON}" >> /tmp/json.tmp.$(date +%Y%m%d-%H%M%S)

if [ ${TEST_MODE} ]; then
	echo ${JSON}
else
	curl -H "Content-Type: application/json" -d "${JSON}" "${WEBHOOK_URL}"
fi