notify-discord.sh

#!/bin/bash
# Notify via Discord - Shell Script
#----This is written for CheckMK to send notifications via Discord
#There was a python version of this but in a docker container...python doesn't have some modules.  SO I wrote it for bash.
# Discord webhook URL
DISCORD_WEBHOOK_URL="$NOTIFY_PARAMETER_1"
# Discord User
USERNAME="Check_MK"

AVATARURL="https://checkmk.com/favicon-96x96.png"

getcolor() {
  case $1 in
    'CRIT' | 'DOWN' ) color=15597568;;
    'WARNING' )       color=16768256;;
    'OK' | 'UP' )     color=52224;;
    'UNKNOWN' |'UNREACHABLE' ) color=13421772;;
    'PROBLEM' )       color=16711680;;
    'RECOVERY' )      color=16711680;;
    '*' )             color=0;;
  esac
  echo $color
}
facts_service=""
case $NOTIFY_WHAT in
  'SERVICE' )
      TITLE="Check_MK Service Alert"
      state=${NOTIFY_SERVICESTATE}
      color=$(getcolor $state)
      subtitle="Service Notification: ${NOTIFY_SERVICEDESC}"
      read -r -d '' facts_service <<EOS
      {"name": "Service", "value": "${NOTIFY_SERVICEDESC}"}
EOS
      output=$NOTIFY_SERVICEOUTPUT
      ;;
  'HOST' )
      TITLE="Check_MK Host Alert"
      state=$NOTIFY_HOSTSTATE
      color=$(getcolor $state)
      subtitle="Host Notification"
      output=$NOTIFY_HOSTOUTPUT
      ;;
esac

read -r -d '' facts <<EOS
    [
        $facts_service,
      {"name": "Host", "value": "$NOTIFY_HOSTNAME"},
      {"name": "State:", "value":"$state"}
    ]
EOS

read -r -d '' MSG <<EOS
{
"username": "$USERNAME",
"avatar_url": "$AVATARURL",
"embeds": [
  {
    "title": "$subtitle",
    "color": $color,
    "fields": $facts,
    "footer": {
        "text": "$output"
    }
  }
]
}
EOS
#echo $MSG
curl -H "Content-Type: application/json" -d "$MSG" "$DISCORD_WEBHOOK_URL"