Merge remote-tracking branch 'origin/master' into merge-upstream

Conflicts:
 	README.md
 	app/controllers/follower_accounts_controller.rb
 	app/controllers/following_accounts_controller.rb
 	app/serializers/rest/instance_serializer.rb
 	app/views/stream_entries/_simple_status.html.haml
 	config/locales/simple_form.ja.yml

app/serializers/activitypub/flag_serializer.rb

@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+class ActivityPub::FlagSerializer < ActiveModel::Serializer
+  attributes :id, :type, :actor, :content
+  attribute :virtual_object, key: :object
+
+  def id
+    # This is nil for now
+    ActivityPub::TagManager.instance.uri_for(object)
+  end
+
+  def type
+    'Flag'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(instance_options[:account] || object.account)
+  end
+
+  def virtual_object
+    [ActivityPub::TagManager.instance.uri_for(object.target_account)] + object.statuses.map { |s| ActivityPub::TagManager.instance.uri_for(s) }
+  end
+
+  def content
+    object.comment
+  end
+end

app/serializers/initial_state_serializer.rb

@@ -22,6 +22,7 @@ class InitialStateSerializer < ActiveModel::Serializer
       locale: I18n.locale,
       domain: Rails.configuration.x.local_domain,
       admin: object.admin&.id&.to_s,
+      search_enabled: Chewy.enabled?,
     }
 
     if object.current_account

app/serializers/rest/instance_serializer.rb

@@ -4,7 +4,12 @@ class REST::InstanceSerializer < ActiveModel::Serializer
   include RoutingHelper
 
   attributes :uri, :title, :description, :email,
-             :version, :urls, :stats, :thumbnail, :max_toot_chars
+             :version, :urls, :stats, :thumbnail, :max_toot_chars,
+             :languages
+
+  has_one :contact_account, serializer: REST::AccountSerializer
+
+  delegate :contact_account, to: :instance_presenter
 
   def uri
     Rails.configuration.x.local_domain
@@ -46,6 +51,10 @@ class REST::InstanceSerializer < ActiveModel::Serializer
     { streaming_api: Rails.configuration.x.streaming_api_base_url }
   end
 
+  def languages
+    [ENV.fetch('DEFAULT_LOCALE', I18n.default_locale)]
+  end
+
   private
 
   def instance_presenter