show action returns current version

app/controllers/moab_storage_controller.rb

@@ -10,6 +10,17 @@ def index
     end
   end
 
+  def show
+    version_metadata_file = Stanford::StorageServices.version_metadata(params['id'])
+    vm = Moab::VersionMetadata.parse(version_metadata_file.read)
+    # FIXME: moab gem likely has a better way to get the latest version (github issue #24)
+    @output = { current_version: vm.versions.last.version_id }
+    respond_to do |format|
+      format.xml { render xml: @output }
+      format.all { render json: @output, content_type: 'application/json' }
+    end
+  end
+
   private
 
   def druids_from_storage_root

config/routes.rb

@@ -1,5 +1,7 @@
 Rails.application.routes.draw do
   get 'moab_storage/index'
 
+  get 'moab_storage/show/:id', to: 'moab_storage#show'
+
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
 end

spec/controllers/moab_storage_controller_spec.rb

@@ -39,4 +39,34 @@
       expect(response.content_type).to eq "application/xml"
     end
   end
+
+  describe "GET #show" do
+    let(:fixture_druid) { 'ct764fs4485' }
+    it "returns http success status code" do
+      get :show, params: { id: fixture_druid }
+      expect(response).to have_http_status(:success)
+    end
+    context 'assigns @output correctly' do
+      it 'Hash' do
+        get :show, params: { id: fixture_druid }
+        expect(assigns(:output)).to be_an_instance_of Hash
+      end
+      it 'current_version' do
+        get :show, params: { id: fixture_druid }
+        expect(assigns(:output)[:current_version]).to eq 10
+      end
+    end
+    it 'returns json by default' do
+      get :show, params: { id: fixture_druid }
+      expect(response.content_type).to eq "application/json"
+    end
+    it 'returns json when requested' do
+      get :show, params: { id: fixture_druid, format: :json }
+      expect(response.content_type).to eq "application/json"
+    end
+    it 'returns xml when requested' do
+      get :show, params: { id: fixture_druid, format: :xml }
+      expect(response.content_type).to eq "application/xml"
+    end
+  end
 end