Compatible with Misskey quote

app/lib/activitypub/activity/create.rb

@@ -112,7 +112,7 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
         conversation: conversation_from_uri(@object['conversation']),
         media_attachment_ids: process_attachments.take(4).map(&:id),
         poll: process_poll,
-        quote: quote_from_url(@object['quoteUrl']),
+        quote: quote,
       }
     end
   end
@@ -383,7 +383,9 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
   def text_from_content
     return Formatter.instance.linkify([[text_from_name, text_from_summary.presence].compact.join("\n\n"), object_url || object_uri].join(' ')) if converted_object_type?
 
-    if @object['content'].present?
+    if @object['quoteUrl'].blank? && @object['_misskey_quote'].present?
+      Formatter.instance.linkify(@object['_misskey_content'])
+    elsif @object['content'].present?
       @object['content']
     elsif content_language_map?
       @object['contentMap'].values.first
@@ -506,10 +508,16 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
     retry
   end
 
+  def quote
+    @quote ||= quote_from_url(@object['quoteUrl'] || @object['_misskey_quote'])
+  end
+
   def quote_from_url(url)
     return nil if url.nil?
 
     quote = ResolveURLService.new.call(url)
     status_from_uri(quote.uri) if quote
+  rescue
+    nil
   end
 end

app/lib/activitypub/case_transform.rb

@@ -14,6 +14,8 @@ module ActivityPub::CaseTransform
       when String
         camel_lower_cache[value] ||= if value.start_with?('_:')
                                        '_:' + value.gsub(/\A_:/, '').underscore.camelize(:lower)
+                                     elsif value.start_with?('_')
+                                       value
                                      else
                                        value.underscore.camelize(:lower)
                                      end

app/serializers/activitypub/note_serializer.rb

@@ -7,8 +7,11 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
              :in_reply_to, :published, :url,
              :attributed_to, :to, :cc, :sensitive,
              :atom_uri, :in_reply_to_atom_uri,
-             :conversation, :quote_url
+             :conversation
 
+  attribute :quote_url, if: -> { object.quote? }
+  attribute :misskey_quote, key: :_misskey_quote, if: -> { object.quote? }
+  attribute :misskey_content, key: :_misskey_content, if: -> { object.quote? }
   attribute :content
   attribute :content_map, if: :language?
 
@@ -126,7 +129,13 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
   end
 
   def quote_url
-    object.quote? ? ActivityPub::TagManager.instance.uri_for(object.quote) : nil
+    ActivityPub::TagManager.instance.uri_for(object.quote) if object.quote?
+  end
+
+  alias misskey_quote quote_url
+
+  def misskey_content
+    object.text if object.quote?
   end
 
   def local?