1 files changed, 68 insertions, 0 deletions
diff --git a/app/services/notes/copy_service.rb b/app/services/notes/copy_service.rb
new file mode 100644
index 00000000000..6e5b4596602
--- /dev/null
+++ b/app/services/notes/copy_service.rb
@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+# This service copies Notes from one Noteable to another.
+#
+# It expects the calling code to have performed the necessary authorization
+# checks in order to allow the copy to happen.
+module Notes
+  class CopyService
+    def initialize(current_user, from_noteable, to_noteable)
+      raise ArgumentError, 'Noteables must be different' if from_noteable == to_noteable
+
+      @current_user = current_user
+      @from_noteable = from_noteable
+      @to_noteable = to_noteable
+      @from_project = from_noteable.project
+      @new_discussion_ids = {}
+    end
+
+    def execute
+      from_noteable.notes_with_associations.find_each do |note|
+        copy_note(note)
+      end
+
+      ServiceResponse.success
+    end
+
+    private
+
+    attr_reader :from_noteable, :to_noteable, :from_project, :current_user, :new_discussion_ids
+
+    def copy_note(note)
+      new_note = note.dup
+      new_params = params_from_note(note, new_note)
+      new_note.update!(new_params)
+
+      copy_award_emoji(note, new_note)
+    end
+
+    def params_from_note(note, new_note)
+      new_discussion_ids[note.discussion_id] ||= Discussion.discussion_id(new_note)
+      rewritten_note = MarkdownContentRewriterService.new(current_user, note.note, from_project, to_noteable.resource_parent).execute
+
+      new_params = {
+        project: to_noteable.project,
+        noteable: to_noteable,
+        discussion_id: new_discussion_ids[note.discussion_id],
+        note: rewritten_note,
+        note_html: nil,
+        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
+
+        # TODO: Implement copying of description versions when an issue is moved
+        # https://gitlab.com/gitlab-org/gitlab/issues/32300
+        new_params[:system_note_metadata].description_version = nil
+      end
+
+      new_params
+    end
+
+    def copy_award_emoji(from_note, to_note)
+      AwardEmojis::CopyService.new(from_note, to_note).execute
+    end
+  end
+end