add feb_meta method to application controller to allow setting custom…

… meta tags

app/controllers/front_end_builds/application_controller.rb

@@ -21,5 +21,21 @@ def error!(errors, status = :unprocessable_entity)
       respond_with_json({ errors: errors }, status: status)
     end
 
+    # Override this method using a decorator to customize what meta tags are 
+    # injected into index.html. Most uses cases will probably want to copy
+    # these default values into their method and add to them rather than
+    # just replace them.
+    def feb_meta(app)
+      {
+        csrf_param: request_forgery_protection_token,
+        csrf_token: form_authenticity_token,
+        front_end_build_version: app.id,
+        front_end_build_params: use_params(:build_search_params).to_query,
+        front_end_build_url: front_end_builds_best_path(
+            use_params(:build_search_params).merge(format: :json)
+          )
+      }
+    end
+
   end
 end

app/controllers/front_end_builds/bests_controller.rb

@@ -29,15 +29,7 @@ def show
     private
 
     def meta_tags
-      tags = {
-        csrf_param: request_forgery_protection_token,
-        csrf_token: form_authenticity_token,
-        front_end_build_version: @front_end.id,
-        front_end_build_params: use_params(:build_search_params).to_query,
-        front_end_build_url: front_end_builds_best_path(
-            use_params(:build_search_params).merge(format: :json)
-          )
-      }
+      tags = feb_meta(@front_end)
 
       tags
         .map { |name, content|

spec/controllers/front_end_builds/bests_controller_spec.rb

@@ -62,7 +62,7 @@ module FrontEndBuilds
         expect(response.body).to match(latest.html)
       end
 
-      context "meta tags" do
+      context "default meta tags" do
         before(:each) do
           get :show, app_name: app.name, branch: 'master'
           expect(response).to be_success
@@ -76,6 +76,19 @@ module FrontEndBuilds
         it { should match(/front-end-build-url/) }
       end
 
+      context "custom meta tags" do
+        before(:each) do
+          allow(controller).to receive(:feb_meta)
+            .and_return({ fake_meta_tag: 'custom' })
+          get :show, app_name: app.name, branch: 'master'
+          expect(response).to be_success
+        end
+
+        subject { response.body }
+
+        it { should match(/fake-meta-tag/) }
+      end
+
       it "should be 404 when nothing is found" do
         get :show, app_name: 'does-not-exist', branch: 'master'
         expect(response).to_not be_success