Extract code from Issues::MoveServicece-3777-promote-to-epic

Extract code to make it easier reusable
- introduce AttributesRewriter and ContentRewriter
  - support group entites when rewriting content
- make Uploader copy_to working for Namespaces

1 files changed, 65 insertions, 0 deletions

diff --git a/app/services/issuable/clone/content_rewriter.rb b/app/services/issuable/clone/content_rewriter.rb
new file mode 100644
index 00000000000..e1e0b75085d
--- /dev/null
+++ b/app/services/issuable/clone/content_rewriter.rb
@@ -0,0 +1,65 @@
+# frozen_string_literal: true
+
+module Issuable
+  module Clone
+    class ContentRewriter < ::Issuable::Clone::BaseService
+      def initialize(current_user, original_entity, new_entity)
+        @current_user = current_user
+        @original_entity = original_entity
+        @new_entity = new_entity
+        @project = original_entity.project
+      end
+
+      def execute
+        rewrite_description
+        rewrite_award_emoji(original_entity, new_entity)
+        rewrite_notes
+      end
+
+      private
+
+      def rewrite_description
+        new_entity.update(description: rewrite_content(original_entity.description))
+      end
+
+      def rewrite_notes
+        original_entity.notes_with_associations.find_each do |note|
+          new_note = note.dup
+          new_params = {
+            project: new_entity.project, noteable: new_entity,
+            note: rewrite_content(new_note.note),
+            created_at: note.created_at,
+            updated_at: note.updated_at
+          }
+
+          if note.system_note_metadata
+            new_params[:system_note_metadata] = note.system_note_metadata.dup
+          end
+
+          new_note.update(new_params)
+
+          rewrite_award_emoji(note, new_note)
+        end
+      end
+
+      def rewrite_content(content)
+        return unless content
+
+        rewriters = [Gitlab::Gfm::ReferenceRewriter, Gitlab::Gfm::UploadsRewriter]
+
+        rewriters.inject(content) do |text, klass|
+          rewriter = klass.new(text, old_project, current_user)
+          rewriter.rewrite(new_parent)
+        end
+      end
+
+      def rewrite_award_emoji(old_awardable, new_awardable)
+        old_awardable.award_emoji.each do |award|
+          new_award = award.dup
+          new_award.awardable = new_awardable
+          new_award.save
+        end
+      end
+    end
+  end
+end