Make Active Storage routes optional

Add configuration option to turn off drawing of Active Storage routes.

activestorage/CHANGELOG.md

+*   Add `config.active_storage.draw_routes` to disable Active Storage routes.
+
+    *Gannon McGibbon*
+
 *   Image analysis is skipped if ImageMagick returns an error.
 
     `ActiveStorage::Analyzer::ImageAnalyzer#metadata` would previously raise a

activestorage/config/routes.rb

@@ -29,4 +29,4 @@
 
   resolve("ActiveStorage::Blob")       { |blob, options| route_for(:rails_blob, blob, options) }
   resolve("ActiveStorage::Attachment") { |attachment, options| route_for(:rails_blob, attachment.blob, options) }
-end
+end if ActiveStorage.draw_routes

activestorage/lib/active_storage.rb

@@ -60,6 +60,7 @@ module ActiveStorage
   mattr_accessor :service_urls_expire_in, default: 5.minutes
 
   mattr_accessor :routes_prefix, default: "/rails/active_storage"
+  mattr_accessor :draw_routes, default: true
 
   mattr_accessor :replace_on_assign_to_many, default: false
 

activestorage/lib/active_storage/engine.rb

@@ -73,6 +73,7 @@ class Engine < Rails::Engine # :nodoc:
         ActiveStorage.analyzers         = app.config.active_storage.analyzers || []
         ActiveStorage.paths             = app.config.active_storage.paths || {}
         ActiveStorage.routes_prefix     = app.config.active_storage.routes_prefix || "/rails/active_storage"
+        ActiveStorage.draw_routes       = app.config.active_storage.draw_routes != false
 
         ActiveStorage.variable_content_types = app.config.active_storage.variable_content_types || []
         ActiveStorage.content_types_to_serve_as_binary = app.config.active_storage.content_types_to_serve_as_binary || []

guides/source/configuring.md

@@ -885,6 +885,8 @@ text/javascript image/svg+xml application/postscript application/x-shockwave-fla
 
 * `config.active_storage.replace_on_assign_to_many` determines whether assigning to a collection of attachments declared with `has_many_attached` replaces any existing attachments or appends to them. The default is `true`.
 
+* `config.active_storage.draw_routes` can be used to toggle Active Storage route generation. The default is `true`.
+
 ### Results of `load_defaults`
 
 #### With '5.0':

railties/test/application/configuration_test.rb

@@ -2593,6 +2593,21 @@ class MyLogger < ::Logger
       MESSAGE
     end
 
+    test "ActiveStorage.draw_routes can be configured via config.active_storage.draw_routes" do
+      app_file "config/environments/development.rb", <<-RUBY
+        Rails.application.configure do
+          config.active_storage.draw_routes = false
+        end
+      RUBY
+
+      output = rails("routes")
+      assert_not_includes(output, "rails_service_blob")
+      assert_not_includes(output, "rails_blob_representation")
+      assert_not_includes(output, "rails_disk_service")
+      assert_not_includes(output, "update_rails_disk_service")
+      assert_not_includes(output, "rails_direct_uploads")
+    end
+
     test "hosts include .localhost in development" do
       app "development"
       assert_includes Rails.application.config.hosts, ".localhost"