chef/cookbooks/fail2ban/templates/slack_notify.sh.erb

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#!/bin/bash
# message first command argument
MESSAGE=$1
HOOK_URL=<%= @slack_webhook %>
HOST=$(hostname)
CHANNEL="#<%= @slack_channel %>"
USERNAME="fail2ban"
ICON=":cop:"
# ip second command argument
IP=$2
# lets find out from what country we have our hacker
COUNTRY=$(curl ipinfo.io/${IP}/country)
# converting country to lover case. I love you bash script =\
COUNTRY=$(echo "$COUNTRY" | tr -s '[:upper:]' '[:lower:]')
# slack emoji
COUNTRY=":flag-$COUNTRY:"
# replace _country_ template to the country emoji
MESSAGE="${MESSAGE/_country_/$COUNTRY}"
curl -X POST --data-urlencode "payload={\"channel\": \"${CHANNEL}\", \"username\": \"${USERNAME}\", \"text\": \"[${HOST}] ${MESSAGE}\", \"icon_emoji\": \"${ICON}\"}" ${HOOK_URL}
exit 0