feat(cluster): implement cloudflare-ddns cronjob in networking namespace

Signed-off-by: Devin Buhl <devin@buhl.casa>

cluster/apps/networking/cloudflare-ddns/cloudflare-ddns.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+set -o nounset
+set -o errexit
+
+current_ipv4="$(curl -s https://ipv4.icanhazip.com/)"
+zone_id=$(curl -s -X GET \
+    "https://api.cloudflare.com/client/v4/zones?name=${CLOUDFLARE_RECORD_NAME#*.}&status=active" \
+    -H "X-Auth-Email: ${CLOUDFLARE_EMAIL}" \
+    -H "X-Auth-Key: ${CLOUDFLARE_APIKEY}" \
+    -H "Content-Type: application/json" \
+        | jq --raw-output ".result[0] | .id"
+)
+record_ipv4=$(curl -s -X GET \
+    "https://api.cloudflare.com/client/v4/zones/${zone_id}/dns_records?name=${CLOUDFLARE_RECORD_NAME}&type=A" \
+    -H "X-Auth-Email: ${CLOUDFLARE_EMAIL}" \
+    -H "X-Auth-Key: ${CLOUDFLARE_APIKEY}" \
+    -H "Content-Type: application/json" \
+)
+old_ip4=$(echo "$record_ipv4" | jq --raw-output '.result[0] | .content')
+if [[ "${current_ipv4}" == "${old_ip4}" ]]; then
+    printf "%s - IP Address '%s' has not changed" "$(date -u)" "${current_ipv4}"
+    exit 0
+fi
+record_ipv4_identifier="$(echo "$record_ipv4" | jq --raw-output '.result[0] | .id')"
+update_ipv4=$(curl -s -X PUT \
+    "https://api.cloudflare.com/client/v4/zones/${zone_id}/dns_records/${record_ipv4_identifier}" \
+    -H "X-Auth-Email: ${CLOUDFLARE_EMAIL}" \
+    -H "X-Auth-Key: ${CLOUDFLARE_APIKEY}" \
+    -H "Content-Type: application/json" \
+    --data "{\"id\":\"${zone_id}\",\"type\":\"A\",\"proxied\":true,\"name\":\"${CLOUDFLARE_RECORD_NAME}\",\"content\":\"${current_ipv4}\"}" \
+)
+if [[ "$(echo "$update_ipv4" | jq --raw-output '.success')" == "true" ]]; then
+    printf "%s - Success - IP Address '%s' has been updated" "$(date -u)" "${current_ipv4}"
+    exit 0
+else
+    printf "%s - Yikes - Updating IP Address '%s' has failed" "$(date -u)" "${current_ipv4}"
+    exit 1
+fi