Remove deprecated legacy CI project status badge

app/controllers/ci/projects_controller.rb

-module Ci
-  class ProjectsController < ::ApplicationController
-    before_action :project
-    before_action :no_cache, only: [:badge]
-    before_action :authorize_read_project!, except: [:badge, :index]
-    skip_before_action :authenticate_user!, only: [:badge]
-    protect_from_forgery
-
-    def index
-      redirect_to root_path
-    end
-
-    def show
-      # Temporary compatibility with CI badges pointing to CI project page
-      redirect_to namespace_project_path(project.namespace, project)
-    end
-
-    # Project status badge
-    # Image with build status for sha or ref
-    #
-    # This action in DEPRECATED, this is here only for backwards compatibility
-    # with projects migrated from GitLab CI.
-    #
-    def badge
-      return render_404 unless @project
-
-      image = Ci::ImageForBuildService.new.execute(@project, params)
-      send_file image.path, filename: image.name, disposition: 'inline', type: "image/svg+xml"
-    end
-
-    protected
-
-    def project
-      @project ||= Project.find_by(ci_id: params[:id].to_i)
-    end
-
-    def no_cache
-      response.headers["Cache-Control"] = "no-cache, no-store, max-age=0, must-revalidate"
-      response.headers["Pragma"] = "no-cache"
-      response.headers["Expires"] = "Fri, 01 Jan 1990 00:00:00 GMT"
-    end
-
-    def authorize_read_project!
-      return access_denied! unless can?(current_user, :read_project, project)
-    end
-  end
-end

app/services/ci/image_for_build_service.rb

-module Ci
-  class ImageForBuildService
-    def execute(project, opts)
-      ref = opts[:ref]
-      sha = opts[:sha] || ref_sha(project, ref)
-      pipelines = project.pipelines.where(sha: sha)
-
-      image_name = image_for_status(pipelines.latest_status(ref))
-      image_path = Rails.root.join('public/ci', image_name)
-
-      OpenStruct.new(path: image_path, name: image_name)
-    end
-
-    private
-
-    def ref_sha(project, ref)
-      project.commit(ref).try(:sha) if ref
-    end
-
-    def image_for_status(status)
-      status ||= 'unknown'
-      'build-' + status + ".svg"
-    end
-  end
-end

config/routes/ci.rb

@@ -5,11 +5,5 @@ namespace :ci do
 
   resource :lint, only: [:show, :create]
 
-  resources :projects, only: [:index, :show] do
-    member do
-      get :status, to: 'projects#badge'
-    end
-  end
-
-  root to: 'projects#index'
+  root to: redirect('/')
 end

spec/controllers/ci/projects_controller_spec.rb

-require 'spec_helper'
-
-describe Ci::ProjectsController do
-  let(:visibility) { :public }
-  let!(:project) { create(:empty_project, visibility, ci_id: 1) }
-  let(:ci_id) { project.ci_id }
-
-  describe '#index' do
-    context 'user signed in' do
-      before do
-        sign_in(create(:user))
-        get(:index)
-      end
-
-      it 'redirects to /' do
-        expect(response).to redirect_to(root_path)
-      end
-    end
-
-    context 'user not signed in' do
-      before { get(:index) }
-
-      it 'redirects to sign in page' do
-        expect(response).to redirect_to(new_user_session_path)
-      end
-    end
-  end
-
-  ##
-  # Specs for *deprecated* CI badge
-  #
-  describe '#badge' do
-    shared_examples 'badge provider' do
-      it 'shows badge' do
-        expect(response.status).to eq 200
-        expect(response.headers)
-          .to include('Content-Type' => 'image/svg+xml')
-      end
-    end
-
-    context 'user not signed in' do
-      before { get(:badge, id: ci_id) }
-
-      context 'project has no ci_id reference' do
-        let(:ci_id) { 123 }
-
-        it 'returns 404' do
-          expect(response.status).to eq 404
-        end
-      end
-
-      context 'project is public' do
-        let(:visibility) { :public }
-        it_behaves_like 'badge provider'
-      end
-
-      context 'project is private' do
-        let(:visibility) { :private }
-        it_behaves_like 'badge provider'
-      end
-    end
-
-    context 'user signed in' do
-      let(:user) { create(:user) }
-      before { sign_in(user) }
-      before { get(:badge, id: ci_id) }
-
-      context 'private is internal' do
-        let(:visibility) { :internal }
-        it_behaves_like 'badge provider'
-      end
-    end
-  end
-end