adding scripts

scripts/auth.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+[[ "$(curl -s "https://www.duckdns.org/update?domains=${CERTBOT_DOMAIN%.duckdns.org}&token=${DUCKDNS_TOKEN}&txt=${CERTBOT_VALIDATION}")" = "OK" ]]
+

scripts/cert.sh

@@ -0,0 +1,16 @@
+#!/bin/sh
+
+# Initial check for certificates
+#TODO check if `certbot certonly` can automatically skip renewal (eliminated need for document here operator)
+certbot certonly --manual --preferred-challenges dns --manual-auth-hook /scripts/auth \
+	--manual-cleanup-hook /scripts/cleanup -m "${LETSENCRYPT_EMAIL}" --no-eff-email \
+	-d "${LETSENCRYPT_DOMAIN}" --agree-tos --manual-public-ip-logging-ok << EOF
+1
+EOF
+
+# Loop generation at a random time every 12 hours
+while :; do
+	# Generate random delay within 12 hours of seconds
+	# sleep the required time
+	# Run renew command
+done

scripts/cleanup.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+[[ "$(curl -s "https://www.duckdns.org/update?domains=${CERTBOT_DOMAIN%.duckdns.org}&token=${DUCKDNS_TOKEN}&txt=${CERTBOT_VALIDATION}&clear=true")" = "OK" ]]

scripts/start.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+# Check variables DUCKDNS_TOKEN, DUCKDNS_DOMAIN, LETSENCRYPT_EMAIL
+if [ -z "$DUCKDNS_TOKEN" ]; then
+	echo ERROR: Variable DUCKDNS_TOKEN is unset
+	exit 1
+fi
+
+if [ -z "$DUCKDNS_DOMAIN" ]; then
+	echo ERROR: Variable DUCKDNS_DOMAIN is unset
+	exit 1
+fi
+
+if [ -z "$LETSENCRYPT_EMAIL" ]; then
+	echo ERROR: Variable LETSENCRYPT_EMAIL is unset
+	exit 1
+fi
+
+# Print variables
+echo DUCKDNS_TOKEN: $DUCKDNS_TOKEN
+echo DUCKDNS_DOMAIN: $DUCKDNS_DOMAIN
+echo LETSENCRYPT_EMAIL: $LETSENCRYPT_EMAIL
+
+# Start automatic ssl certificate generation
+/bin/sh /scripts/cert.sh