Integrate auction

Closes #874

app/controllers/api/v1/auctions_controller.rb

@@ -0,0 +1,47 @@
+module Api
+  module V1
+    class AuctionsController < BaseController
+      before_action :authenticate, except: :index
+
+      def index
+        render json: Auction.started.map { |auction| serializable_hash(auction) }
+      end
+
+      def show
+        auction = Auction.find_by(uuid: params[:uuid])
+        render json: serializable_hash(auction)
+      end
+
+      def update
+        auction = Auction.find_by(uuid: params[:uuid])
+
+        case params[:status]
+        when Auction.statuses[:awaiting_payment]
+          auction.awaiting_payment!
+        when Auction.statuses[:no_bids]
+          auction.mark_as_no_bids
+        when Auction.statuses[:payment_received]
+          auction.mark_as_payment_received
+        when Auction.statuses[:payment_not_received]
+          auction.mark_as_payment_not_received
+        else
+          raise "Invalid status #{params[:status]}"
+        end
+
+        render json: serializable_hash_for_update_action(auction)
+      end
+
+      private
+
+      def serializable_hash(auction)
+        { id: auction.uuid, domain: auction.domain, status: auction.status }
+      end
+
+      def serializable_hash_for_update_action(auction)
+        hash = serializable_hash(auction)
+        hash[:registration_code] = auction.registration_code if auction.payment_received?
+        hash
+      end
+    end
+  end
+end