1 files changed, 91 insertions, 0 deletions
diff --git a/activestorage/lib/active_storage/engine.rb b/activestorage/lib/active_storage/engine.rb
new file mode 100644
index 0000000000..b41d8bb4d7
--- /dev/null
+++ b/activestorage/lib/active_storage/engine.rb
@@ -0,0 +1,91 @@
+# frozen_string_literal: true
+
+require "rails"
+require "active_storage"
+
+require "active_storage/previewer/pdf_previewer"
+require "active_storage/previewer/video_previewer"
+
+require "active_storage/analyzer/image_analyzer"
+require "active_storage/analyzer/video_analyzer"
+
+module ActiveStorage
+  class Engine < Rails::Engine # :nodoc:
+    isolate_namespace ActiveStorage
+
+    config.active_storage = ActiveSupport::OrderedOptions.new
+    config.active_storage.previewers = [ ActiveStorage::Previewer::PDFPreviewer, ActiveStorage::Previewer::VideoPreviewer ]
+    config.active_storage.analyzers = [ ActiveStorage::Analyzer::ImageAnalyzer, ActiveStorage::Analyzer::VideoAnalyzer ]
+    config.active_storage.variable_content_types = [ "image/png", "image/gif", "image/jpg", "image/jpeg", "image/vnd.adobe.photoshop" ]
+    config.active_storage.paths = ActiveSupport::OrderedOptions.new
+
+    config.eager_load_namespaces << ActiveStorage
+
+    initializer "active_storage.configs" do
+      config.after_initialize do |app|
+        ActiveStorage.logger     = app.config.active_storage.logger || Rails.logger
+        ActiveStorage.queue      = app.config.active_storage.queue
+        ActiveStorage.previewers = app.config.active_storage.previewers || []
+        ActiveStorage.analyzers  = app.config.active_storage.analyzers || []
+        ActiveStorage.variable_content_types = app.config.active_storage.variable_content_types || []
+      end
+    end
+
+    initializer "active_storage.attached" do
+      require "active_storage/attached"
+
+      ActiveSupport.on_load(:active_record) do
+        extend ActiveStorage::Attached::Macros
+      end
+    end
+
+    initializer "active_storage.verifier" do
+      config.after_initialize do |app|
+        ActiveStorage.verifier = app.message_verifier("ActiveStorage")
+      end
+    end
+
+    initializer "active_storage.services" do
+      config.to_prepare do
+        if config_choice = Rails.configuration.active_storage.service
+          configs = Rails.configuration.active_storage.service_configurations ||= begin
+            config_file = Pathname.new(Rails.root.join("config/storage.yml"))
+            raise("Couldn't find Active Storage configuration in #{config_file}") unless config_file.exist?
+
+            require "yaml"
+            require "erb"
+
+            YAML.load(ERB.new(config_file.read).result) || {}
+          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}"
+          end
+
+          ActiveStorage::Blob.service =
+            begin
+              ActiveStorage::Service.configure config_choice, configs
+            rescue => e
+              raise e, "Cannot load `Rails.config.active_storage.service`:\n#{e.message}", e.backtrace
+            end
+        end
+      end
+    end
+
+    initializer "active_storage.paths" do
+      config.after_initialize do |app|
+        if ffprobe_path = app.config.active_storage.paths.ffprobe
+          ActiveStorage::Analyzer::VideoAnalyzer.ffprobe_path = ffprobe_path
+        end
+
+        if ffmpeg_path = app.config.active_storage.paths.ffmpeg
+          ActiveStorage::Previewer::VideoPreviewer.ffmpeg_path = ffmpeg_path
+        end
+
+        if mutool_path = app.config.active_storage.paths.mutool
+          ActiveStorage::Previewer::PDFPreviewer.mutool_path = mutool_path
+        end
+      end
+    end
+  end
+end