adding the ability to save the Compose YAML representation of an app …

…as an anonymous Gist

app/controllers/apps_controller.rb

@@ -65,6 +65,14 @@ def compose_yml
     end
   end
 
+  def compose_gist
+    app = App.find(params[:id])
+    gist = Converters::AppConverter.new(app).to_compose_gist
+    html_url = gist[:html_url]
+    raw_url = gist[:files][Converters::AppConverter::DOCKER_COMPOSE_FILENAME][:raw_url]
+    render json: { links: { gist: { href: html_url, raw_url: raw_url } } }, status: 201
+  end
+
   private
 
   def app_update_params

app/models/converters/app_converter.rb

@@ -1,5 +1,6 @@
 module Converters
   class AppConverter
+    DOCKER_COMPOSE_FILENAME = 'docker-compose.yml'
 
     attr_reader :app
 
@@ -19,8 +20,18 @@ def to_compose_yaml
       compose_hash.to_yaml
     end
 
+    def to_compose_gist(filename=DOCKER_COMPOSE_FILENAME)
+      github_client.create_gist(description: 'created by Panamax',
+                                public: true,
+                                files: { filename => { content: to_compose_yaml } })
+    end
+
     private
 
+    def github_client
+      @github_client ||= Octokit::Client.new
+    end
+
     def service_to_image(service)
       ServiceConverter.new(service).to_image
     end

config/routes.rb

@@ -15,6 +15,7 @@
       put :rebuild
       post :template
       get :compose_yml
+      post :compose_gist
     end
 
     resources :categories, only: [:index, :show, :create, :update, :destroy]

spec/controllers/apps_controller_spec.rb

@@ -324,4 +324,37 @@
       expect(response.body).to eq('{"compose_yaml":"---\\\\n"}')
     end
   end
+
+  describe '#compose_gist' do
+    fixtures :services
+
+    let(:app) { App.first }
+    let(:converter_response) do
+      {
+        html_url: 'html',
+        files: { 'docker-compose.yml' => { raw_url: 'raw' } }
+      }
+    end
+    let(:converter) { double('converter', to_compose_gist: converter_response) }
+    let(:expected_response) { { links: { gist: { href: 'html', raw_url: 'raw' } } } }
+
+    before do
+      allow(Converters::AppConverter).to receive(:new).with(app).and_return(converter)
+    end
+
+    it 'invokes the app converter' do
+      expect(Converters::AppConverter).to receive(:new).with(app)
+      post :compose_gist, id: app.id, format: :json
+    end
+
+    it 'returns a created status' do
+      post :compose_gist, id: app.id, format: :json
+      expect(response.status).to eq(201)
+    end
+
+    it 'returns the gist URIs' do
+      post :compose_gist, id: app.id, format: :json
+      expect(response.body).to eq expected_response.to_json
+    end
+  end
 end

spec/models/converters/app_converter_spec.rb

@@ -29,4 +29,26 @@
       expect(rb.keys).to match_array apps(:app1).services.map(&:name)
     end
   end
+
+  context '#to_compose_gist' do
+    fixtures :apps, :services
+
+    let(:github_client) { double('github_client', create_gist: {}) }
+    let(:create_params) do
+      {
+        description: 'created by Panamax',
+        public: true,
+        files: { 'docker-compose.yml' => { content: subject.to_compose_yaml } }
+      }
+    end
+
+    before do
+      allow(Octokit::Client).to receive(:new).and_return(github_client)
+    end
+
+    it 'uses Octokit to create a new gist' do
+      expect(github_client).to receive(:create_gist).with(create_params)
+      subject.to_compose_gist
+    end
+  end
 end