1 files changed, 46 insertions, 0 deletions
diff --git a/lib/api/entities/todo.rb b/lib/api/entities/todo.rb
new file mode 100644
index 00000000000..820d1ceaadd
--- /dev/null
+++ b/lib/api/entities/todo.rb
@@ -0,0 +1,46 @@
+# frozen_string_literal: true
+
+module API
+  module Entities
+    class Todo < Grape::Entity
+      expose :id
+      expose :project, using: Entities::ProjectIdentity, if: -> (todo, _) { todo.project_id }
+      expose :group, using: 'API::Entities::NamespaceBasic', if: -> (todo, _) { todo.group_id }
+      expose :author, using: Entities::UserBasic
+      expose :action_name
+      expose :target_type
+
+      expose :target do |todo, options|
+        todo_options = options.fetch(todo.target_type, {})
+        todo_target_class(todo.target_type).represent(todo.target, todo_options)
+      end
+
+      expose :target_url do |todo, options|
+        todo_target_url(todo)
+      end
+
+      expose :body
+      expose :state
+      expose :created_at
+
+      def todo_target_class(target_type)
+        # false as second argument prevents looking up in module hierarchy
+        # see also https://gitlab.com/gitlab-org/gitlab-foss/issues/59719
+        ::API::Entities.const_get(target_type, false)
+      end
+
+      def todo_target_url(todo)
+        target_type = todo.target_type.underscore
+        target_url = "#{todo.resource_parent.class.to_s.underscore}_#{target_type}_url"
+
+        Gitlab::Routing
+          .url_helpers
+          .public_send(target_url, todo.resource_parent, todo.target, anchor: todo_target_anchor(todo)) # rubocop:disable GitlabSecurity/PublicSend
+      end
+
+      def todo_target_anchor(todo)
+        "note_#{todo.note_id}" if todo.note_id?
+      end
+    end
+  end
+end