mastodon/app/lib/activitypub/activity/like.rb

# frozen_string_literal: true

class ActivityPub::Activity::Like < ActivityPub::Activity
  def perform
    original_status = status_from_uri(object_uri)

    return if original_status.nil? || !original_status.account.local? || delete_arrived_first?(@json['id']) || @account.favourited?(original_status)

    favourite = original_status.favourites.create!(account: @account)

    LocalNotificationWorker.perform_async(original_status.account_id, favourite.id, 'Favourite', 'favourite')
    Trends.statuses.register(original_status)
  end
end