handler-example.sh

#!/usr/bin/env bash

# Note: keep stdout clean, as it may be used to pass data back in the future,
# and it is used to signal NotImplemented.
# Inspiration taken from: https://github.com/marcan/letsencrypt-external

set -e
cmd="$1"
shift

case "$cmd" in
    pre-perform)
        echo "-----BEGIN PRE-PERFORM-----" 1>&2
        echo "-----END PRE-PERFORM-----" 1>&2
        ;;
    perform)
        echo "-----BEGIN PERFORM-----" 1>&2
        echo "cmd: ${cmd}" 1>&2
        echo "type: ${type}" 1>&2
        echo "domain: ${domain}" 1>&2
        echo "uri: ${uri}" 1>&2
        echo "validation: ${validation}" 1>&2
        echo "key-auth: ${key_auth}" 1>&2
        echo "z_domain: ${z_domain}" 1>&2
        echo "cert_path: ${cert_path}" 1>&2
        echo "key_path: ${key_path}" 1>&2
        echo "port: ${port}" 1>&2
        echo "json: ${cbot_json}" 1>&2
        # the json below is from dynu's API you will need to change accordingly
        curl -X POST https://api.dynu.com/v2/dns/<DNS-ID>/record -H "accept: application/json" -H "API-Key: <API-KEY>" \
        -H "Content-Type: application/json" -d "{\"nodeName\":\"_acme-challenge\",\"recordType\":\"TXT\",\"ttl\":90,\"state\":true,\"group\":\"\",\"textData\":\"${validation}\"}"
        
        # wait for the record to actually show up (the builtin time out is WAY too sort)
        while true
        do
            recordset=$(dig _acme-challenge.<DOMAIN> TXT +short | tr -d "\"")
            if [[ $recordset == ${validation} ]]
            then
                sleep 10s
                break
            else
                sleep 1m
            fi
        done
        echo "-----END PERFORM-----" 1>&2
        ;;
    post-perform)
        echo "-----BEGIN POST-PERFORM-----" 1>&2
        echo "-----END POST-PERFORM-----" 1>&2
        ;;
    pre-cleanup)
        echo "-----BEGIN PRE-CLEANUP-----" 1>&2
        echo "-----END PRE-CLEANUP-----" 1>&2
        ;;
    cleanup)
        echo "-----BEGIN CLEANUP-----" 1>&2
        echo "cmd: ${cmd}" 1>&2
        echo "type: ${type}" 1>&2
        echo "domain: ${domain}" 1>&2
        echo "status: ${status}" 1>&2
        echo "token: ${token}" 1>&2
        echo "error: ${error}" 1>&2
        echo "json: ${cbot_json}" 1>&2
        recordset=$(curl -s -X GET  https://api.dynu.com/v2/dns/<DNS-ID>/record -H "accept: application/json" -H "API-Key: <API-KEY>")
        temp=$(echo "$recordset" | sed 's+{+\n+g' | grep "${validation}" | cut -d ":" -f 2 | cut -d "," -f 1)
        curl -s -X DELETE https://api.dynu.com/v2/dns/<DNS-ID>/record/"${records[0]}" -H "accept: application/json" -H "API-Key: <API-KEY>"
        echo "-----END CLEANUP-----" 1>&2
        ;;
    post-cleanup)
        echo "-----BEGIN POST-CLEANUP-----" 1>&2
        echo "-----END POST-CLEANUP-----" 1>&2
        ;;
    *)
        # Signalizing the given command is not implemented
        echo "NotImplemented"
        exit 1
        ;;
esac