Add support for editing for published statuses (#16697)

* Add support for editing for published statuses

* Fix references to stripped-out code

* Various fixes and improvements

* Further fixes and improvements

* Fix updates being potentially sent to unauthorized recipients

* Various fixes and improvements

* Fix wrong words in test

* Fix notifying accounts that were tagged but were not in the audience

* Fix mistake

app/serializers/activitypub/note_serializer.rb

@@ -11,6 +11,7 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
 
   attribute :content
   attribute :content_map, if: :language?
+  attribute :updated, if: :edited?
 
   has_many :media_attachments, key: :attachment
   has_many :virtual_tags, key: :tag
@@ -65,6 +66,8 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
     object.language.present?
   end
 
+  delegate :edited?, to: :object
+
   def in_reply_to
     return unless object.reply? && !object.thread.nil?
 
@@ -79,6 +82,10 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
     object.created_at.iso8601
   end
 
+  def updated
+    object.edited_at.iso8601
+  end
+
   def url
     ActivityPub::TagManager.instance.url_for(object)
   end

app/serializers/rest/status_edit_serializer.rb

@@ -0,0 +1,6 @@
+# frozen_string_literal: true
+
+class REST::StatusEditSerializer < ActiveModel::Serializer
+  attributes :text, :spoiler_text, :media_attachments_changed,
+             :created_at
+end

app/serializers/rest/status_serializer.rb

@@ -4,7 +4,7 @@ class REST::StatusSerializer < ActiveModel::Serializer
   attributes :id, :created_at, :in_reply_to_id, :in_reply_to_account_id,
              :sensitive, :spoiler_text, :visibility, :language,
              :uri, :url, :replies_count, :reblogs_count,
-             :favourites_count
+             :favourites_count, :edited_at
 
   attribute :favourited, if: :current_user?
   attribute :reblogged, if: :current_user?

app/serializers/rest/status_source_serializer.rb

@@ -0,0 +1,9 @@
+# frozen_string_literal: true
+
+class REST::StatusSourceSerializer < ActiveModel::Serializer
+  attributes :id, :text, :spoiler_text
+
+  def id
+    object.id.to_s
+  end
+end