Registrant confirms: Poll domain change application

app/controllers/api/v1/registrant/confirms_controller.rb

@@ -0,0 +1,55 @@
+require 'serializers/registrant_api/domain'
+
+module Api
+  module V1
+    module Registrant
+      class ConfirmsController < ::Api::V1::Registrant::BaseController
+        skip_before_action :authenticate, :set_paper_trail_whodunnit
+        before_action :set_domain, only: %i[index update]
+        before_action :verify_updateable, only: %i[index update]
+
+        def index
+          render json: {
+            domain_name: @domain.name,
+            current_registrant: serialized_registrant(@domain.registrant),
+            new_registrant: serialized_registrant(@domain.pending_registrant)
+          }
+        end
+
+        def update
+        end
+
+        private
+
+        def serialized_registrant(registrant)
+          {
+            name: registrant.try(:name),
+            ident: registrant.try(:ident),
+            country: registrant.try(:ident_country_code)
+          }
+        end
+
+        def confirmation_params
+          params do |p|
+            p.require(:name)
+            p.require(:token)
+          end
+        end
+
+        def set_domain
+          @domain = Domain.find_by(name: confirmation_params[:name])
+          return if @domain
+
+          render json: { error: 'Domain not found' }, status: :not_found
+        end
+
+        def verify_updateable
+          return if @domain.registrant_update_confirmable?(confirmation_params[:token])
+
+          render json: { error: 'Application expired or not found' },
+          status: :unauthorized
+        end
+      end
+    end
+  end
+end