1 files changed, 28 insertions, 0 deletions
diff --git a/lib/active_storage/disk_controller.rb b/lib/active_storage/disk_controller.rb
new file mode 100644
index 0000000000..3eba86c213
--- /dev/null
+++ b/lib/active_storage/disk_controller.rb
@@ -0,0 +1,28 @@
+require "action_controller"
+require "active_storage/blob"
+require "active_storage/verified_key_with_expiration"
+
+require "active_support/core_ext/object/inclusion"
+
+class ActiveStorage::DiskController < ActionController::Base
+  def show
+    if key = decode_verified_key
+      blob = ActiveStorage::Blob.find_by!(key: key)
+      
+      if stale?(etag: blob.checksum)
+        send_data blob.download, filename: blob.filename, type: blob.content_type, disposition: disposition_param
+      end
+    else
+      head :not_found
+    end
+  end
+
+  private
+    def decode_verified_key
+      ActiveStorage::VerifiedKeyWithExpiration.decode(params[:encoded_key])
+    end
+
+    def disposition_param
+      params[:disposition].presence_in(%w( inline attachment )) || 'inline'
+    end
+end