Add ISO standard validators

config/locales/en.yml

@@ -235,6 +235,8 @@ en:
       unimplemented_command: 'Unimplemented command'
       domain_exists_but_belongs_to_other_registrar: 'Domain exists but belongs to other registrar'
       required_ident_attribute_missing: "Required ident attribute missing: %{key}"
+      invalid_iso31661_alpha2: does not conform to ISO 3166-1 alpha-2 standard
+      invalid_iso8601: does not conform to ISO 8601 standard
 
   code: 'Code'
   value: 'Value'

lib/validators/iso31661_alpha2_validator.rb

@@ -0,0 +1,11 @@
+class Iso31661Alpha2Validator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    record.errors.add(attribute, :invalid_iso31661_alpha2) unless valid_country_code?(value)
+  end
+
+  private
+
+  def valid_country_code?(country_code)
+    Country.new(country_code)
+  end
+end

lib/validators/iso8601_validator.rb

@@ -0,0 +1,13 @@
+class Iso8601Validator < ActiveModel::EachValidator
+  def validate_each(record, attribute, value)
+    if options[:date_only]
+      record.errors.add(attribute, :invalid_iso8601) unless value =~ date_format
+    end
+  end
+
+  private
+
+  def date_format
+    /\d{4}-\d{2}-\d{2}/
+  end
+end

spec/lib/validators/iso31661_alpha2.rb

@@ -0,0 +1,17 @@
+# https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2
+
+RSpec.shared_examples 'iso31661_alpha2' do
+  describe 'validation' do
+    it 'rejects invalid' do
+      model.send("#{attribute}=", 'invalid')
+      model.validate
+      expect(model.errors).to be_added(attribute, :invalid_iso31661_alpha2)
+    end
+
+    it 'accepts valid' do
+      model.send("#{attribute}=", 'US')
+      model.validate
+      expect(model.errors).to_not be_added(attribute, :invalid_iso31661_alpha2)
+    end
+  end
+end

spec/lib/validators/iso8601.rb

@@ -0,0 +1,17 @@
+# https://en.wikipedia.org/wiki/ISO_8601
+
+RSpec.shared_examples 'iso8601' do
+  describe 'validation' do
+    it 'rejects invalid' do
+      model.send("#{attribute}=", '2010-07-0')
+      model.validate
+      expect(model.errors).to be_added(attribute, :invalid_iso8601)
+    end
+
+    it 'accepts valid' do
+      model.send("#{attribute}=", '2010-07-05')
+      model.validate
+      expect(model.errors).to_not be_added(attribute, :invalid_iso8601)
+    end
+  end
+end