You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: catalog_controller.rb
    path of file: ./repos/gitlabhq/app/controllers/explore
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Explore
  class CatalogController < Explore::ApplicationController
    include ProductAnalyticsTracking

    feature_category :pipeline_composition
    before_action :check_resource_access, only: :show
    track_internal_event :index, name: 'unique_users_visiting_ci_catalog', conditions: :current_user

    def show; end


    
    def show; end

    def index
      render 'show'
    end

    private

    def check_resource_access
      render_404 unless catalog_resource.present?
    end

    def catalog_resource
      ::Ci::Catalog::Listing.new(current_user).find_resource(full_path: params[:full_path])
    end

    def tracking_namespace_source
      current_user.namespace
    end

    def tracking_project_source
      nil
    end
  end