one-off submission

app/jobs/generate_attachment_preview_job.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+class GenerateAttachmentPreviewJob
+  include Sidekiq::Job
+
+  InvalidFormat = Class.new(StandardError)
+
+  sidekiq_options queue: :images
+
+  def perform(params = {})
+    attachment = ActiveStorage::Attachment.find(params['attachment_id'])
+
+    if attachment.content_type == Templates::ProcessDocument::PDF_CONTENT_TYPE
+      Templates::ProcessDocument.generate_pdf_preview_images(attachment, attachment.download)
+    elsif attachment.image?
+      Templates::ProcessDocument.generate_preview_image(attachment, attachment.download)
+    else
+      raise InvalidFormat, attachment.id
+    end
+  end
+end