pstaender · February 20, 2022 14:40 · Feb 20, 2022
diff --git a/update_hetzner_home_dns.rb b/update_hetzner_home_dns.rb
@@ -0,0 +1,70 @@
+require 'json'
+require 'httparty'
+
+class HetznerDNS
+  include HTTParty
+  base_uri 'https://dns.hetzner.com'
+
+  def initialize
+    @options = {
+      headers: {
+        'Auth-API-Token' => ENV['HETZNER_DNS']
+      }
+    }
+  end
+
+  def zones
+    self.class.get('/api/v1/zones', @options)
+  end
+
+  def zone_by_name(name)
+    zones['zones'].filter { |r| r['name'] == name }.first
+  end
+
+  def records_by_zone_id(zone_id)
+    self.class.get('/api/v1/records', @options.merge({ zone_id: zone_id }))
+  end
+
+  def create_record(zone_id:, name:, type:, value:, ttl: nil)
+    body = {
+      name: name,
+      type: type,
+      value: value,
+      ttl: ttl,
+      zone_id: zone_id
+    }
+    self.class.post('/api/v1/records', @options.merge({ body: body.to_json }))
+  end
+
+  def update_record(record_id:, zone_id:, name:, type:, value:, ttl: nil)
+    body = {
+      name: name,
+      type: type,
+      value: value,
+      ttl: ttl,
+      zone_id: zone_id
+    }
+    self.class.put("/api/v1/records/#{record_id}", @options.merge({ body: body.to_json }))
+  end
+end
+
+current_ip = HTTParty.get('https://api.ipify.org?format=json')['ip']
+subdomain = 'myhome'
+
+client = HetznerDNS.new
+zone_id = client.zone_by_name('mydomain.com')['id']
+record = client.records_by_zone_id(zone_id)['records'].filter { |r| r['name'] == subdomain && r['type'] == 'A' }.first
+
+if record
+  puts "Updating dns record with ip #{current_ip}"
+  pp client.update_record(
+      record_id: record['id'],
+      zone_id: zone_id,
+      name: subdomain,
+      type: 'A',
+      value: current_ip
+  )
+else
+  puts "Creating dns record with ip #{current_ip}"
+  pp client.create_record(zone_id: zone_id, name: subdomain, type: 'A', value: current_ip)
+end