class Rails::Application::DefaultMiddlewareStack

def build_stack
  ActionDispatch::MiddlewareStack.new.tap do |middleware|
    if config.force_ssl
      middleware.use ::ActionDispatch::SSL, config.ssl_options
    end
    middleware.use ::Rack::Sendfile, config.action_dispatch.x_sendfile_header
    if config.public_file_server.enabled
      headers = config.public_file_server.headers || {}
      headers['Cache-Control'.freeze] = config.static_cache_control if config.static_cache_control
      middleware.use ::ActionDispatch::Static, paths["public"].first, index: config.public_file_server.index_name, headers: headers
    end
    if rack_cache = load_rack_cache
      require "action_dispatch/http/rack_cache"
      middleware.use ::Rack::Cache, rack_cache
    end
    if config.allow_concurrency == false
      # User has explicitly opted out of concurrent request
      # handling: presumably their code is not threadsafe
      middleware.use ::Rack::Lock
    end
    middleware.use ::ActionDispatch::Executor, app.executor
    middleware.use ::Rack::Runtime
    middleware.use ::Rack::MethodOverride unless config.api_only
    middleware.use ::ActionDispatch::RequestId
    # Must come after Rack::MethodOverride to properly log overridden methods
    middleware.use ::Rails::Rack::Logger, config.log_tags
    middleware.use ::ActionDispatch::ShowExceptions, show_exceptions_app
    middleware.use ::ActionDispatch::DebugExceptions, app, config.debug_exception_response_format
    middleware.use ::ActionDispatch::RemoteIp, config.action_dispatch.ip_spoofing_check, config.action_dispatch.trusted_proxies
    unless config.cache_classes
      middleware.use ::ActionDispatch::Reloader, app.reloader
    end
    middleware.use ::ActionDispatch::Callbacks
    middleware.use ::ActionDispatch::Cookies unless config.api_only
    if !config.api_only && config.session_store
      if config.force_ssl && config.ssl_options.fetch(:secure_cookies, true) && !config.session_options.key?(:secure)
        config.session_options[:secure] = true
      end
      middleware.use config.session_store, config.session_options
      middleware.use ::ActionDispatch::Flash
    end
    middleware.use ::Rack::Head
    middleware.use ::Rack::ConditionalGet
    middleware.use ::Rack::ETag, "no-cache"
  end
end

def initialize(app, config, paths)
  @app = app
  @config = config
  @paths = paths
end

def load_rack_cache
  rack_cache = config.action_dispatch.rack_cache
  return unless rack_cache
  begin
    require 'rack/cache'
  rescue LoadError => error
    error.message << ' Be sure to add rack-cache to your Gemfile'
    raise
  end
  if rack_cache == true
    {
      metastore: "rails:/",
      entitystore: "rails:/",
      verbose: false
    }
  else
    rack_cache
  end
end

def show_exceptions_app
  config.exceptions_app || ActionDispatch::PublicExceptions.new(Rails.public_path)
end