rails/railties/test/application/middleware_test.rb

# frozen_string_literal: true

require "isolation/abstract_unit"

module ApplicationTests
  class MiddlewareTest < ActiveSupport::TestCase
    include ActiveSupport::Testing::Isolation

    def setup
      build_app
      FileUtils.rm_rf "#{app_path}/config/environments"
    end

    def teardown
      teardown_app
    end

    def app
      @app ||= Rails.application
    end

    test "default middleware stack" do
      add_to_config "config.active_record.migration_error = :page_load"

      boot!

      assert_equal [
        "Webpacker::DevServerProxy",
        "ActionDispatch::HostAuthorization",
        "Rack::Sendfile",
        "ActionDispatch::Static",
        "ActionDispatch::Executor",
        "ActiveSupport::Cache::Strategy::LocalCache",
        "Rack::Runtime",
        "Rack::MethodOverride",
        "ActionDispatch::RequestId",
        "ActionDispatch::RemoteIp",
        "Rails::Rack::Logger",
        "ActionDispatch::ShowExceptions",
        "ActionDispatch::DebugExceptions",
        "ActionDispatch::ActionableExceptions",
        "ActionDispatch::Reloader",
        "ActionDispatch::Callbacks",
        "ActiveRecord::Migration::CheckPending",
        "ActionDispatch::Cookies",
        "ActionDispatch::Session::CookieStore",
        "ActionDispatch::Flash",
        "ActionDispatch::ContentSecurityPolicy::Middleware",
        "ActionDispatch::FeaturePolicy::Middleware",
        "Rack::Head",
        "Rack::ConditionalGet",
        "Rack::ETag",
        "Rack::TempfileReaper"
      ], middleware
    end

    test "api middleware stack" do
      add_to_config "config.api_only = true"

      boot!

      assert_equal [
        "Webpacker::DevServerProxy",
        "ActionDispatch::HostAuthorization",
        "Rack::Sendfile",
        "ActionDispatch::Static",
        "ActionDispatch::Executor",
        "ActiveSupport::Cache::Strategy::LocalCache",
        "Rack::Runtime",
        "ActionDispatch::RequestId",
        "ActionDispatch::RemoteIp",
        "Rails::Rack::Logger",
        "ActionDispatch::ShowExceptions",
        "ActionDispatch::DebugExceptions",
        "ActionDispatch::ActionableExceptions",
        "ActionDispatch::Reloader",
        "ActionDispatch::Callbacks",
        "Rack::Head",
        "Rack::ConditionalGet",
        "Rack::ETag"
      ], middleware
    end

    test "middleware dependencies" do
      boot!

      # The following array-of-arrays describes dependencies between
      # middlewares: the first item in each list depends on the
      # remaining items (and therefore must occur later in the
      # middleware stack).

      dependencies = [
        # Logger needs a fully "corrected" request environment
        %w(Rails::Rack::Logger Rack::MethodOverride ActionDispatch::RequestId ActionDispatch::RemoteIp),

        # Serving public/ doesn't invoke user code, so it should skip
        # locks etc
        %w(ActionDispatch::Executor ActionDispatch::Static),

        # Errors during reload must be reported
        %w(ActionDispatch::Reloader ActionDispatch::ShowExceptions ActionDispatch::DebugExceptions),

        # Outright dependencies
        %w(ActionDispatch::Static Rack::Sendfile),
        %w(ActionDispatch::Flash ActionDispatch::Session::CookieStore),
        %w(ActionDispatch::Session::CookieStore ActionDispatch::Cookies),
      ]

      require "tsort"
      sorted = TSort.tsort((middleware | dependencies.flatten).method(:each),
                           lambda { |n, &b| dependencies.each { |m, *ds| ds.each(&b) if m == n } })
      assert_equal sorted, middleware
    end

    test "Rack::Cache is not included by default" do
      boot!

      assert_not_includes middleware, "Rack::Cache", "Rack::Cache is not included in the default stack unless you set config.action_dispatch.rack_cache"
    end

    test "Rack::Cache is present when action_dispatch.rack_cache is set" do
      add_to_config "config.action_dispatch.rack_cache = true"

      boot!

      assert_includes middleware, "Rack::Cache"
    end

    test "ActiveRecord::Migration::CheckPending is present when active_record.migration_error is set to :page_load" do
      add_to_config "config.active_record.migration_error = :page_load"

      boot!

      assert_includes middleware, "ActiveRecord::Migration::CheckPending"
    end

    test "ActionDispatch::SSL is present when force_ssl is set" do
      add_to_config "config.force_ssl = true"
      boot!
      assert_includes middleware, "ActionDispatch::SSL"
    end

    test "ActionDispatch::SSL is configured with options when given" do
      add_to_config "config.force_ssl = true"
      add_to_config "config.ssl_options = { redirect: { host: 'example.com' } }"
      boot!

      assert_equal [{ redirect: { host: "example.com" } }], Rails.application.middleware[2].args
    end

    test "removing Active Record omits its middleware" do
      use_frameworks []
      boot!
      assert_not_includes middleware, "ActiveRecord::Migration::CheckPending"
    end

    test "includes executor" do
      boot!
      assert_includes middleware, "ActionDispatch::Executor"
    end

    test "does not include lock if cache_classes is set and so is eager_load" do
      add_to_config "config.cache_classes = true"
      add_to_config "config.eager_load = true"
      boot!
      assert_not_includes middleware, "Rack::Lock"
    end

    test "does not include lock if allow_concurrency is set to :unsafe" do
      add_to_config "config.allow_concurrency = :unsafe"
      boot!
      assert_not_includes middleware, "Rack::Lock"
    end

    test "includes lock if allow_concurrency is disabled" do
      add_to_config "config.allow_concurrency = false"
      boot!
      assert_includes middleware, "Rack::Lock"
    end

    test "removes static asset server if public_file_server.enabled is disabled" do
      add_to_config "config.public_file_server.enabled = false"
      boot!
      assert_not_includes middleware, "ActionDispatch::Static"
    end

    test "can delete a middleware from the stack" do
      add_to_config "config.middleware.delete ActionDispatch::Static"
      boot!
      assert_not_includes middleware, "ActionDispatch::Static"
    end

    test "can delete a middleware from the stack even if insert_before is added after delete" do
      add_to_config "config.middleware.delete Rack::Runtime"
      add_to_config "config.middleware.insert_before(Rack::Runtime, Rack::Config)"
      boot!
      assert_includes middleware, "Rack::Config"
      assert_not middleware.include?("Rack::Runtime")
    end

    test "can delete a middleware from the stack even if insert_after is added after delete" do
      add_to_config "config.middleware.delete Rack::Runtime"
      add_to_config "config.middleware.insert_after(Rack::Runtime, Rack::Config)"
      boot!
      assert_includes middleware, "Rack::Config"
      assert_not middleware.include?("Rack::Runtime")
    end

    test "includes exceptions middlewares even if action_dispatch.show_exceptions is disabled" do
      add_to_config "config.action_dispatch.show_exceptions = false"
      boot!
      assert_includes middleware, "ActionDispatch::ShowExceptions"
      assert_includes middleware, "ActionDispatch::DebugExceptions"
    end

    test "removes ActionDispatch::Reloader if cache_classes is true" do
      add_to_config "config.cache_classes = true"
      boot!
      assert_not_includes middleware, "ActionDispatch::Reloader"
    end

    test "use middleware" do
      use_frameworks []
      add_to_config "config.middleware.use Rack::Config"
      boot!
      assert_equal "Rack::Config", middleware.last
    end

    test "insert middleware after" do
      add_to_config "config.middleware.insert_after Rack::Sendfile, Rack::Config"
      boot!
      assert_equal "Rack::Config", middleware.fourth
    end

    test "unshift middleware" do
      add_to_config "config.middleware.unshift Rack::Config"
      boot!
      assert_equal "Rack::Config", middleware.second
    end

    test "Rails.cache does not respond to middleware" do
      add_to_config "config.cache_store = :memory_store"
      boot!
      assert_equal "Rack::Runtime", middleware[5]
    end

    test "Rails.cache does respond to middleware" do
      boot!
      assert_equal "ActiveSupport::Cache::Strategy::LocalCache", middleware[5]
      assert_equal "Rack::Runtime", middleware[6]
    end

    test "insert middleware before" do
      add_to_config "config.middleware.insert_before Rack::Sendfile, Rack::Config"
      boot!
      assert_equal "Rack::Config", middleware.third
    end

    test "can't change middleware after it's built" do
      boot!
      assert_raise FrozenError do
        app.config.middleware.use Rack::Config
      end
    end

    # ConditionalGet + Etag
    test "conditional get + etag middlewares handle http caching based on body" do
      make_basic_app

      class ::OmgController < ActionController::Base
        def index
          if params[:nothing]
            render plain: ""
          else
            render plain: "OMG"
          end
        end
      end

      etag = "W/" + "c00862d1c6c1cf7c1b49388306e7b3c1".inspect

      get "/"
      assert_equal 200, last_response.status
      assert_equal "OMG", last_response.body
      assert_equal "text/plain; charset=utf-8", last_response.headers["Content-Type"]
      assert_equal "max-age=0, private, must-revalidate", last_response.headers["Cache-Control"]
      assert_equal etag, last_response.headers["Etag"]

      get "/", {}, { "HTTP_IF_NONE_MATCH" => etag }
      assert_equal 304, last_response.status
      assert_equal "", last_response.body
      assert_nil last_response.headers["Content-Type"]
      assert_equal "max-age=0, private, must-revalidate", last_response.headers["Cache-Control"]
      assert_equal etag, last_response.headers["Etag"]

      get "/?nothing=true"
      assert_equal 200, last_response.status
      assert_equal "", last_response.body
      assert_equal "text/plain; charset=utf-8", last_response.headers["Content-Type"]
      assert_equal "no-cache", last_response.headers["Cache-Control"]
      assert_nil last_response.headers["Etag"]
    end

    test "ORIGINAL_FULLPATH is passed to env" do
      boot!
      env = ::Rack::MockRequest.env_for("/foo/?something")
      Rails.application.call(env)

      assert_equal "/foo/?something", env["ORIGINAL_FULLPATH"]
    end

    private
      def boot!
        require "#{app_path}/config/environment"
      end

      def middleware
        Rails.application.middleware.map(&:klass).map(&:name)
      end
  end
end