Certbot hook for iwantmyname DNS verification

certbot command

/usr/local/bin/certbot-auto renew --manual-auth-hook /path/to/certbot_before.sh --renew-hook "service nginx reload"
# Note that it might take 3-4 minutes per challenge

certbot_before.sh

#!/bin/bash

DOMAIN_NS="$(dig +short SOA $CERTBOT_DOMAIN | cut -d' ' -f1)"

curl -s -S -u "your@email.com:yourpassword" "https://iwantmyname.com/basicauth/ddns?hostname=_acme-challenge.$CERTBOT_DOMAIN&type=txt&value=$CERTBOT_VALIDATION"

TXT_RECORDS=""
RESULT_LEN=0
check_txt_record () {
    TXT_RECORDS="$(dig +short txt _acme-challenge.$CERTBOT_DOMAIN @$DOMAIN_NS | grep $CERTBOT_VALIDATION)"
    RESULT_LEN="${#TXT_RECORDS}"
}

check_txt_record

until [[ "$RESULT_LEN" -gt "0" ]]; do
    check_txt_record
    sleep 1
done

printf "good\n"