From 3e2bb49efc35039d9510ea0f9d11b5446b53c923 Mon Sep 17 00:00:00 2001
From: David Vazgenovich Shakaryan <dvshakaryan@gmail.com>
Date: Fri, 9 Dec 2022 05:14:07 -0800
Subject: automatically tokenise domain

---
 linode-ddns.sh | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)

(limited to 'linode-ddns.sh')

diff --git a/linode-ddns.sh b/linode-ddns.sh
index d3a9923..cd0cd76 100755
--- a/linode-ddns.sh
+++ b/linode-ddns.sh
@@ -2,12 +2,12 @@
 #
 # Copyright 2022 David Vazgenovich Shakaryan
 #
-# LINODE_TOKEN=<token> linode-ddns.sh <domain> <record name>
+# LINODE_TOKEN=<token> linode-ddns.sh <domain>
 
 IP_RESOLVER='https://ifconfig.co'
+TARGET="${1}"
 
-DOMAIN="${1}"
-RECORD="${2}"
+shopt -s extglob
 
 die() {
 	[[ -n "${@}" ]] && echo "${@}" >&2
@@ -22,18 +22,25 @@ lincurl() {
 
 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'
+dom_re="${TARGET}"
+while [[ "${dom_re}" =~ ^([^\\]*)\.(.*)$ ]]; do
+	dom_re="(${BASH_REMATCH[1]}\\.)?${BASH_REMATCH[2]}"
+done
 
-res=$(lincurl "${domain_id}/records") || die 'Records lookup failed'
-record_id="$(jq -er --arg name "${RECORD}" \
+res="$(lincurl)" || die 'Domains lookup failed'
+IFS='|' read dom_id dom_name < <(jq -er --arg re "${dom_re}" \
+	'[.data[] | select(.domain | test("\\A" + $re + "\\z"))] |
+		if . == [] then (null | halt_error) else . end |
+		max_by(.domain | length) | [.id, .domain] | join("|")' \
+	<<< "${res}") || die 'Domain not found'
+rec_name="${TARGET%%?(.)${dom_name}}"
+
+res=$(lincurl "${dom_id}/records") || die 'Records lookup failed'
+rec_id="$(jq -er --arg name "${rec_name}" \
 	'first(.data[] | select(.type == "A" and .name == $name)) | .id' \
 	<<< "${res}")" || die 'Record not found'
 
-res="$(lincurl "${domain_id}/records/${record_id}")" \
-	|| die 'Record lookup failed'
+res="$(lincurl "${dom_id}/records/${rec_id}")" || die 'Record lookup failed'
 old_ip="$(jq -r '.target' <<< "${res}")"
 
 if [[ "${old_ip}" == "${ip}" ]]; then
@@ -41,7 +48,7 @@ if [[ "${old_ip}" == "${ip}" ]]; then
 	exit
 fi
 
-res="$(lincurl "${domain_id}/records/${record_id}" \
+res="$(lincurl "${dom_id}/records/${rec_id}" \
 	-H 'Content-Type: application/json' \
 	-X PUT -d "{\"target\":\"${ip}\"}")" || die 'Record update failed'
 new_ip="$(jq -r '.target' <<< "${res}")"
-- 
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