Send an alert via Slack if a UPS event happens. It is usable with nut/upsmon.

upsmon_slack_alerter

#!/bin/bash

# Send an alert via Slack if a UPS event happens. It is usable with nut/upsmon.

# licence: CC0

# Slack notifier sctipz to use with nut
# configure upsmon.conf like this: 
#  NOTIFYMSG ONLINE        "1 UPS %s on line power :electric_plug:"
#  NOTIFYMSG ONBATT        "0 UPS %s on battery :battery:"
#  NOTIFYMSG LOWBATT       "0 UPS %s battery is low :low_battery:"
#  NOTIFYMSG FSD           "0 UPS %s: forced shutdown in progress :small_red_triangle_down:"
#  NOTIFYMSG COMMOK        "1 Communications with UPS %s established"
#  NOTIFYMSG COMMBAD       "0 Communications with UPS %s lost"
#  NOTIFYMSG SHUTDOWN      "0 Auto logout and shutdown proceeding"
#  NOTIFYMSG REPLBATT      "0 UPS %s battery needs to be replaced"
#  NOTIFYMSG NOCOMM        "0 UPS %s is unavailable"
#  NOTIFYMSG NOPARENT      "0 upsmon parent process died - shutdown impossible"
# if a line starts with 1 gets a green bar, otherwise red

# slack token
# more info: 
# https://api.slack.com/tutorials/tracks/posting-messages-with-curl
# https://api.slack.com/methods/chat.postMessage
# enable "icon_emoji" needs chat:write.customize permission in the oauth_config » scopes » bot path
TOKEN="xoxb-not-a-real-token-this-will-not-work" #DO NOT COMMIT A REAL TOKEN TO PUBLIC PLACE

WEBHOOOK="https://slack.com/api/chat.postMessage"
CHANNEL="#general"

TEXT=${@}

COLOR_RED="#f00"
COLOR_GREEN="#0f0"

TITLE="UPS Alert @$(hostname)" 

COLOR=${COLOR_RED}
if [[ ${TEXT} = 1* ]]
then
  COLOR=${COLOR_GREEN}
fi 

TEXT=${TEXT:2}

DATA=$(
  jq -n \
    --arg channel "${CHANNEL}" \
    --arg title "${TITLE}" \
    --arg text "${TEXT}" \
    --arg color "${COLOR}" \
    '{ 
        channel: $channel, 
        icon_emoji: ":zap:", 
        attachments: [{
          color: $color, 
          title: $title,
          text: $text,
        }]
    }'
)

curl \
  -X POST \
  -H "Authorization: Bearer ${TOKEN}" \
  -H "Content-type: application/json; charset=utf-8" \
  --data "${DATA}" \
  "${WEBHOOOK}" > /dev/null 2>&1