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#!/usr/bin/env bash
#
# Copyright 2022 David Vazgenovich Shakaryan
#
# LINODE_TOKEN=<token> linode-ddns.sh <domain> <record name>
IP_RESOLVER='https://ifconfig.co'
DOMAIN="${1}"
RECORD="${2}"
die() {
[[ -n "${@}" ]] && echo "${@}" >&2
exit 1
}
lincurl() {
curl -sfH "Authorization: Bearer ${LINODE_TOKEN}" \
"https://api.linode.com/v4/domains/${1}" \
"${@:2}"
}
ip="$(curl -sf4 "${IP_RESOLVER}")" || die 'IP lookup failed'
res="$(lincurl)" || die 'Domains lookup failed'
domain_id="$(jq -er --arg domain "${DOMAIN}" \
'first(.data[] | select(.domain == $domain)) | .id' \
<<< "${res}")" || die 'Domain not found'
res=$(lincurl "${domain_id}/records") || die 'Records lookup failed'
record_id="$(jq -er --arg name "${RECORD}" \
'first(.data[] | select(.type == "A" and .name == $name)) | .id' \
<<< "${res}")" || die 'Record not found'
res="$(lincurl "${domain_id}/records/${record_id}")" \
|| die 'Record lookup failed'
old_ip="$(jq -r '.target' <<< "${res}")"
if [[ "${old_ip}" == "${ip}" ]]; then
echo "IP unchanged from ${ip}"
exit
fi
res="$(lincurl "${domain_id}/records/${record_id}" \
-H 'Content-Type: application/json' \
-X PUT -d "{\"target\":\"${ip}\"}")" || die 'Record update failed'
new_ip="$(jq -r '.target' <<< "${res}")"
echo "IP changed from ${old_ip} to ${new_ip}"
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