Allow EPP contact:update with the same ident data as current one

#569

app/models/epp/contact.rb

@@ -158,7 +158,11 @@ class Epp::Contact < Contact
     # https://github.com/internetee/registry/issues/576
     if ident_frame
       if identifier.valid?
-        report_valid_ident_error
+        submitted_ident = Ident.new(code: ident_frame.text,
+                                    type: ident_frame.attr('type'),
+                                    country_code: ident_frame.attr('cc'))
+
+        report_valid_ident_error if submitted_ident != identifier
       else
         ident_update_attempt = ident_frame.text.present? && (ident_frame.text != ident)
         report_ident_update_error if ident_update_attempt

spec/requests/epp/contact/update/ident_spec.rb

@@ -34,7 +34,23 @@ RSpec.describe 'EPP contact:update' do
   end
 
   context 'when contact ident is valid' do
-    let!(:contact) { create(:contact, code: 'TEST', ident: 'test', ident_type: 'priv', ident_country_code: 'US') }
+    context 'when submitted ident matches current one' do
+      let!(:contact) { create(:contact, code: 'TEST',
+                              ident: 'test',
+                              ident_type: 'priv',
+                              ident_country_code: 'US') }
+
+      specify do
+        request
+        expect(epp_response).to have_result(:success)
+      end
+    end
+
+    context 'when submitted ident does not match current one' do
+      let!(:contact) { create(:contact, code: 'TEST',
+                              ident: 'another-test',
+                              ident_type: 'priv',
+                              ident_country_code: 'US') }
 
       it 'does not update code' do
         expect do
@@ -64,6 +80,7 @@ RSpec.describe 'EPP contact:update' do
                                             t('epp.contacts.errors.valid_ident'))
       end
     end
+  end
 
   context 'when contact ident is invalid' do
     let(:contact) { build(:contact, code: 'TEST', ident: 'test', ident_type: nil, ident_country_code: nil) }