ddns-scripts: add support for Scaleway DNS

Signed-off-by: Lars Kaiser <lars@kaiser.yt>

net/ddns-scripts/files/usr/lib/ddns/update_scaleway_com.sh

@@ -0,0 +1,108 @@
+#!/bin/sh
+
+# This script sends DNS updates using the Scaleway DNS API.
+# See https://www.scaleway.com/en/developers/api/domains-and-dns/
+#
+# This script uses an API token created in the Scaleway Console.
+# The user is responsible for creating the token, ensuring it has the
+# DomainsDNSFullAccess permission set. The records to be updated
+# may already exist, but will be created if not.
+#
+# Arguments:
+#
+# - $username: The zone in which the RR is to be set.
+#   Example: example.org
+#
+# - $password: The API token.
+#
+# - $domain: The domain to update.
+#
+# - $param_opt: Optional TTL for the records, in seconds. Defaults to 300 (5m).
+#
+# Dependencies:
+# - ddns-scripts  (for the base functionality)
+# - curl          (for the Scaleway DNS API)
+
+. /usr/share/libubox/jshn.sh
+
+format_record_set() {
+	local domain="$1"
+	local record_type="$2"
+	local ttl="$3"
+	shift 3 # The remaining arguments are the IP addresses for this record set.
+
+	json_init
+	json_add_array "changes"
+	json_add_object ""
+	json_add_object "set"
+
+	json_add_object "id_fields"
+	json_add_string "name" "${domain}"
+	json_add_string "type" "${record_type}"
+	json_close_object
+
+	json_add_array "records"
+	for value in "$@"; do
+		json_add_object ""
+		json_add_string "data" "${value}"
+		json_add_string "name" "${domain}"
+		json_add_string "type" "${record_type}"
+		json_add_int "ttl" "${ttl}"
+		json_close_object
+	done
+	json_close_array
+
+	json_close_object
+	json_close_object
+	json_close_array
+	json_dump
+}
+
+patch_record_set() {
+	local access_token="$1"
+	local zone="$2"
+	local domain="$3"
+	local record_type="$4"
+	local ttl="$5"
+	shift 5 # The remaining arguments are the IP addresses for this record set.
+
+	local url="https://api.scaleway.com/domain/v2beta1/dns-zones/${zone}/records"
+	local payload
+	payload=$(format_record_set ${domain} ${record_type} ${ttl} "$@")
+	write_log 7 "cURL request payload: ${payload}"
+
+	${CURL} ${url} \
+		--show-error --silent --fail-with-body \
+		--request   PATCH \
+		--header    "X-Auth-Token: ${access_token}" \
+		--json      "${payload}" \
+		--write-out "%{response_code}" \
+		--output $DATFILE 2> $ERRFILE
+
+	if [ $? -ne 0 ]; then
+		write_log 3 "cURL failed: $(cat $ERRFILE) \nscaleway.com response: $(cat $DATFILE)"
+		return 1
+	fi
+}
+
+main() {
+	local ttl record_type
+
+	# Dependency checking
+	[ -z "${CURL_SSL}" ] && write_log 13 "Scaleway DNS requires cURL with SSL support"
+
+	# Argument parsing
+	[ -z ${param_opt} ] && ttl=300 || ttl="${param_opt}"
+	[ ${use_ipv6} -ne 0 ] && record_type="AAAA" || record_type="A"
+
+	# Sanity checks
+	[ -z "${password}" ] && write_log 13 "Config is missing 'password' (API token)"
+	[ -z "${domain}" ] && write_log 13 "Config is missing 'domain'"
+	[ -z "${username}" ] && write_log 13 "Config is missing 'username' (DNS zone)"
+	[ -z "${ttl}" ] && write_log 13 "Could not parse TTL"
+	[ -z "${record_type}" ] && write_log 13 "Could not determine the record type"
+
+	patch_record_set "${password}" "${username}" "${domain}" "${record_type}" "${ttl}" "${__IP}"
+}
+
+main "$@"