1 files changed, 56 insertions, 0 deletions
diff --git a/lib/active_storage/engine.rb b/lib/active_storage/engine.rb
new file mode 100644
index 0000000000..3512be0468
--- /dev/null
+++ b/lib/active_storage/engine.rb
@@ -0,0 +1,56 @@
+require "rails/engine"
+
+module ActiveStorage
+  class Engine < Rails::Engine # :nodoc:
+    config.active_storage = ActiveSupport::OrderedOptions.new
+
+    config.eager_load_namespaces << ActiveStorage
+
+    initializer "active_storage.routes" do
+      require "active_storage/disk_controller"
+
+      config.after_initialize do |app|
+        app.routes.prepend do
+          get "/rails/blobs/:encoded_key" => "active_storage/disk#show", as: :rails_disk_blob
+        end
+      end
+    end
+
+    initializer "active_storage.attached" do
+      require "active_storage/attached"
+
+      ActiveSupport.on_load(:active_record) do
+        extend ActiveStorage::Attached::Macros
+      end
+    end
+
+    config.after_initialize do |app|
+      config_choice = app.config.active_storage.service
+      config_file   = Pathname.new(Rails.root.join("config/storage_services.yml"))
+
+      if config_choice
+        raise("Couldn't find Active Storage configuration in #{config_file}") unless config_file.exist?
+
+        begin
+          require "yaml"
+          require "erb"
+          configs = YAML.load(ERB.new(config_file.read).result) || {}
+
+          if service_configuration = configs[config_choice.to_s].symbolize_keys
+            service_name = service_configuration.delete(:service)
+
+            ActiveStorage::Blob.service = ActiveStorage::Service.configure(service_name, service_configuration)
+          else
+            raise "Couldn't configure Active Storage as #{config_choice} was not found in #{config_file}"
+          end
+        rescue Psych::SyntaxError => e
+          raise "YAML syntax error occurred while parsing #{config_file}. " \
+                "Please note that YAML must be consistently indented using spaces. Tabs are not allowed. " \
+                "Error: #{e.message}"
+        rescue => e
+          raise e, "Cannot load `Rails.config.active_storage.service`:\n#{e.message}", e.backtrace
+        end
+      end
+    end
+  end
+end