Minor ActivityPub JSON fixes (#4214)

- Objects must have attributedTo instead of actor
- The current attribute belongs to CollectionPage, not Collection

app/controllers/activitypub/outboxes_controller.rb

@@ -20,7 +20,6 @@ class ActivityPub::OutboxesController < Api::BaseController
     ActivityPub::CollectionPresenter.new(
       id: account_outbox_url(@account),
       type: :ordered,
-      current: account_outbox_url(@account),
       size: @account.statuses_count,
       items: @statuses
     )

app/controllers/follower_accounts_controller.rb

@@ -21,7 +21,6 @@ class FollowerAccountsController < ApplicationController
     ActivityPub::CollectionPresenter.new(
       id: account_followers_url(@account),
       type: :ordered,
-      current: account_followers_url(@account),
       size: @account.followers_count,
       items: @follows.map { |f| ActivityPub::TagManager.instance.uri_for(f.account) }
     )

app/controllers/following_accounts_controller.rb

@@ -21,7 +21,6 @@ class FollowingAccountsController < ApplicationController
     ActivityPub::CollectionPresenter.new(
       id: account_following_index_url(@account),
       type: :ordered,
-      current: account_following_index_url(@account),
       size: @account.following_count,
       items: @follows.map { |f| ActivityPub::TagManager.instance.uri_for(f.target_account) }
     )

app/controllers/tags_controller.rb

@@ -23,7 +23,6 @@ class TagsController < ApplicationController
     ActivityPub::CollectionPresenter.new(
       id: tag_url(@tag),
       type: :ordered,
-      current: tag_url(@tag),
       size: @tag.statuses.count,
       items: @statuses.map { |s| ActivityPub::TagManager.instance.uri_for(s) }
     )

app/presenters/activitypub/collection_presenter.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 class ActivityPub::CollectionPresenter < ActiveModelSerializers::Model
-  attributes :id, :type, :current, :size, :items
+  attributes :id, :type, :size, :items
 end

app/serializers/activitypub/collection_serializer.rb

@@ -6,8 +6,7 @@ class ActivityPub::CollectionSerializer < ActiveModel::Serializer
     super
   end
 
-  attributes :id, :type, :total_items,
+  attributes :id, :type, :total_items
-             :current
 
   has_many :items, key: :ordered_items
 

app/serializers/activitypub/note_serializer.rb

@@ -3,7 +3,7 @@
 class ActivityPub::NoteSerializer < ActiveModel::Serializer
   attributes :id, :type, :summary, :content,
              :in_reply_to, :published, :url,
-             :actor, :to, :cc, :sensitive
+             :attributed_to, :to, :cc, :sensitive
 
   has_many :media_attachments, key: :attachment
   has_many :virtual_tags, key: :tag
@@ -36,7 +36,7 @@ class ActivityPub::NoteSerializer < ActiveModel::Serializer
     ActivityPub::TagManager.instance.url_for(object)
   end
 
-  def actor
+  def attributed_to
     ActivityPub::TagManager.instance.uri_for(object.account)
   end