Rename "locked" to "manuallyApprovesFollowers" in ActivityPub (#4779)

See: <https://www.w3.org/wiki/Activity_Streams_extensions#as:manuallyApprovesFollowers>

app/lib/activitypub/adapter.rb

@@ -7,10 +7,9 @@ class ActivityPub::Adapter < ActiveModelSerializers::Adapter::Base
       'https://w3id.org/security/v1',
 
       {
-        'locked'    => 'as:locked',
+        'manuallyApprovesFollowers' => 'as:manuallyApprovesFollowers',
         'sensitive'                 => 'as:sensitive',
         'Hashtag'                   => 'as:Hashtag',
-
         'ostatus'                   => 'http://ostatus.org#',
         'atomUri'                   => 'ostatus:atomUri',
         'inReplyToAtomUri'          => 'ostatus:inReplyToAtomUri',

app/serializers/activitypub/actor_serializer.rb

@@ -6,7 +6,7 @@ class ActivityPub::ActorSerializer < ActiveModel::Serializer
   attributes :id, :type, :following, :followers,
              :inbox, :outbox, :shared_inbox,
              :preferred_username, :name, :summary,
-             :url, :locked
+             :url, :manually_approves_followers
 
   has_one :public_key, serializer: ActivityPub::PublicKeySerializer
 
@@ -90,4 +90,8 @@ class ActivityPub::ActorSerializer < ActiveModel::Serializer
   def header_exists?
     object.header.exists?
   end
+
+  def manually_approves_followers
+    object.locked
+  end
 end

app/services/activitypub/process_account_service.rb

@@ -50,7 +50,7 @@ class ActivityPub::ProcessAccountService < BaseService
     @account.avatar_remote_url   = image_url('icon')
     @account.header_remote_url   = image_url('image')
     @account.public_key          = public_key || ''
-    @account.locked              = @json['locked'] || false
+    @account.locked              = @json['manuallyApprovesFollowers'] || false
     @account.save!
   end