Define missing JSON-LD properties (#4767)

Using _: property names is discouraged, as in the future,
canonicalization may throw an error when encountering that instead
of discarding it silently like it does now.

We are defining some ActivityStreams properties which we expect
to land in ActivityStreams eventually, to ensure that future versions
of Mastodon will remain compatible with this even once that happens.
Those would be `locked`, `sensitive` and `Hashtag`

We are defining a custom context inline for some properties which we
do not expect to land in any other context. `atomUri`, `inReplyToAtomUri`
and `conversation` are part of the custom defined OStatus context.

8 files changed, 41 insertions, 17 deletions

diff --git a/app/lib/activitypub/activity/create.rb b/app/lib/activitypub/activity/create.rb
index a6f1e60d9..081e80570 100644
--- a/app/lib/activitypub/activity/create.rb
+++ b/app/lib/activitypub/activity/create.rb
@@ -26,7 +26,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
 
   def find_existing_status
     status   = status_from_uri(object_uri)
-    status ||= Status.find_by(uri: @object['_:atomUri']) if @object['_:atomUri'].present?
+    status ||= Status.find_by(uri: @object['atomUri']) if @object['atomUri'].present?
     status
   end
 
@@ -43,7 +43,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
       sensitive: @object['sensitive'] || false,
       visibility: visibility_from_audience,
       thread: replied_to_status,
-      conversation: conversation_from_uri(@object['_:conversation']),
+      conversation: conversation_from_uri(@object['conversation']),
     }
   end
 
@@ -125,7 +125,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
       @replied_to_status = nil
     else
       @replied_to_status   = status_from_uri(in_reply_to_uri)
-      @replied_to_status ||= status_from_uri(@object['_:inReplyToAtomUri']) if @object['_:inReplyToAtomUri'].present?
+      @replied_to_status ||= status_from_uri(@object['inReplyToAtomUri']) if @object['inReplyToAtomUri'].present?
       @replied_to_status
     end
   end
diff --git a/app/lib/activitypub/activity/delete.rb b/app/lib/activitypub/activity/delete.rb
index 9d804c86d..4c6afb090 100644
--- a/app/lib/activitypub/activity/delete.rb
+++ b/app/lib/activitypub/activity/delete.rb
@@ -17,7 +17,7 @@ class ActivityPub::Activity::Delete < ActivityPub::Activity
 
   def delete_note
     status   = Status.find_by(uri: object_uri, account: @account)
-    status ||= Status.find_by(uri: @object['_:atomUri'], account: @account) if @object.is_a?(Hash) && @object['_:atomUri'].present?
+    status ||= Status.find_by(uri: @object['atomUri'], account: @account) if @object.is_a?(Hash) && @object['atomUri'].present?
 
     delete_later!(object_uri)
 
diff --git a/app/lib/activitypub/adapter.rb b/app/lib/activitypub/adapter.rb
index 92210579e..fe4dddd38 100644
--- a/app/lib/activitypub/adapter.rb
+++ b/app/lib/activitypub/adapter.rb
@@ -1,6 +1,24 @@
 # frozen_string_literal: true
 
 class ActivityPub::Adapter < ActiveModelSerializers::Adapter::Base
+  CONTEXT = {
+    '@context': [
+      'https://www.w3.org/ns/activitystreams',
+      'https://w3id.org/security/v1',
+
+      {
+        'locked'    => 'as:locked',
+        'sensitive' => 'as:sensitive',
+        'Hashtag'   => 'as:Hashtag',
+
+        'ostatus'          => 'http://ostatus.org#',
+        'atomUri'          => 'ostatus:atomUri',
+        'inReplyToAtomUri' => 'ostatus:inReplyToAtomUri',
+        'conversation'     => 'ostatus:conversation',
+      },
+    ],
+  }.freeze
+
   def self.default_key_transform
     :camel_lower
   end
@@ -11,7 +29,7 @@ class ActivityPub::Adapter < ActiveModelSerializers::Adapter::Base
 
   def serializable_hash(options = nil)
     options = serialization_options(options)
-    serialized_hash = { '@context': [ActivityPub::TagManager::CONTEXT, 'https://w3id.org/security/v1'] }.merge(ActiveModelSerializers::Adapter::Attributes.new(serializer, instance_options).serializable_hash(options))
+    serialized_hash = CONTEXT.merge(ActiveModelSerializers::Adapter::Attributes.new(serializer, instance_options).serializable_hash(options))
     self.class.transform_key_casing!(serialized_hash, instance_options)
   end
 end
diff --git a/app/serializers/activitypub/actor_serializer.rb b/app/serializers/activitypub/actor_serializer.rb
index a72ecee24..f004dc326 100644
--- a/app/serializers/activitypub/actor_serializer.rb
+++ b/app/serializers/activitypub/actor_serializer.rb
@@ -6,12 +6,10 @@ class ActivityPub::ActorSerializer < ActiveModel::Serializer
   attributes :id, :type, :following, :followers,
              :inbox, :outbox, :shared_inbox,
              :preferred_username, :name, :summary,
-             :url
+             :url, :locked
 
   has_one :public_key, serializer: ActivityPub::PublicKeySerializer
 
-  attribute :locked, key: '_:locked'
-
   class ImageSerializer < ActiveModel::Serializer
     include RoutingHelper
 
diff --git a/app/serializers/activitypub/delete_serializer.rb b/app/serializers/activitypub/delete_serializer.rb
index a041c577b..87a43b95d 100644
--- a/app/serializers/activitypub/delete_serializer.rb
+++ b/app/serializers/activitypub/delete_serializer.rb
@@ -2,8 +2,7 @@
 
 class ActivityPub::DeleteSerializer < ActiveModel::Serializer
   class TombstoneSerializer < ActiveModel::Serializer
-    attributes :id, :type
-    attribute :atom_uri, key: '_:atomUri'
+    attributes :id, :type, :atom_uri
 
     def id
       ActivityPub::TagManager.instance.uri_for(object)
diff --git a/app/serializers/activitypub/note_serializer.rb b/app/serializers/activitypub/note_serializer.rb
index 15031dfdc..d42f54263 100644
--- a/app/serializers/activitypub/note_serializer.rb
+++ b/app/serializers/activitypub/note_serializer.rb
@@ -3,14 +3,13 @@
 class ActivityPub::NoteSerializer < ActiveModel::Serializer
   attributes :id, :type, :summary, :content,
              :in_reply_to, :published, :url,
-             :attributed_to, :to, :cc, :sensitive
+             :attributed_to, :to, :cc, :sensitive,
+             :atom_uri, :in_reply_to_atom_uri,
+             :conversation
 
   has_many :media_attachments, key: :attachment
   has_many :virtual_tags, key: :tag
 
-  attribute :atom_uri, key: '_:atomUri', if: :local?
-  attribute :in_reply_to_atom_uri, key: '_:inReplyToAtomUri'
-
   def id
     ActivityPub::TagManager.instance.uri_for(object)
   end
@@ -62,6 +61,8 @@ class ActivityPub::NoteSerializer < ActiveModel::Serializer
   end
 
   def atom_uri
+    return unless object.local?
+
     ::TagManager.instance.uri_for(object)
   end
 
@@ -71,6 +72,14 @@ class ActivityPub::NoteSerializer < ActiveModel::Serializer
     ::TagManager.instance.uri_for(object.thread)
   end
 
+  def conversation
+    if object.conversation.uri?
+      object.conversation.uri
+    else
+      TagManager.instance.unique_tag(object.conversation.created_at, object.conversation.id, 'Conversation')
+    end
+  end
+
   def local?
     object.account.local?
   end
diff --git a/app/services/activitypub/fetch_remote_status_service.rb b/app/services/activitypub/fetch_remote_status_service.rb
index c114515cd..68ca58d62 100644
--- a/app/services/activitypub/fetch_remote_status_service.rb
+++ b/app/services/activitypub/fetch_remote_status_service.rb
@@ -25,8 +25,8 @@ class ActivityPub::FetchRemoteStatusService < BaseService
   def activity_json
     if %w(Note Article).include? @json['type']
       {
-        'type' => 'Create',
-        'actor' => first_of_value(@json['attributedTo']),
+        'type'   => 'Create',
+        'actor'  => first_of_value(@json['attributedTo']),
         'object' => @json,
       }
     else
diff --git a/app/services/activitypub/process_account_service.rb b/app/services/activitypub/process_account_service.rb
index 99f9dbdc2..44798d051 100644
--- a/app/services/activitypub/process_account_service.rb
+++ b/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['locked'] || false
     @account.save!
   end