Generate email content from ninja2 templates

files/change_notification.j2

@@ -0,0 +1,9 @@
+Your dynamic DNS entry has changed.
+
+Hostname: {{fqdn}}
+{% if ipv4_changed %}
+IPv4 address: {{ipv4}} (changed at: {{last_ipv4_update}})
+{% endif %}
+{% if ipv6_changed %}
+IPv6 address: {{ipv6}} (changed at: {{last_ipv6_update}})
+{% endif %}

files/config.example.toml

@@ -30,6 +30,8 @@ path = "/var/lib/ddns-service/ddns.db"  # required for sqlite
 # dns_timeout = 5  # default, seconds
 # ddns_default_key_file = "/etc/ddns-service/ddns.key"  # optional, BIND TSIG key
 # cleanup_interval = 60  # default, seconds
+# change_notification_template = "/etc/ddns-service/change_notification.j2"  # optional
+# expiry_notification_template = "/etc/ddns-service/expiry_notification.j2"  # optional
 
 # Per-zone TSIG key overrides (optional)
 # [dns_service.zone_keys]

files/ddns-service-9999.ebuild

@@ -55,6 +55,7 @@ python_install_all() {
 
 	dodir /etc/${PN}
 	insinto /etc/${PN}
+	doins files/*.j2
 	insopts -m640
 	newins files/config.example.toml config.toml
 	fowners -R ddns:ddns /etc/${PN}

files/expiry_notification.j2

@@ -0,0 +1,12 @@
+Your dynamic DNS entry has expired due to inactivity.
+
+Hostname: {{fqdn}}
+{% if ipv4_expired %}
+IPv4 address: {{last_ipv4}} (last update: {{last_ipv4_update}})
+{% endif %}
+{% if ipv6_expired %}
+IPv6 address: {{last_ipv6}} (last update: {{last_ipv6_update}})
+{% endif %}
+Expiry TTL: {{expiry_ttl}} seconds
+
+The DNS records have been removed. Update your client to restore them.