mastodon/app/services/remove_status_service.rb

# frozen_string_literal: true

class RemoveStatusService < BaseService
  include StreamEntryRenderer

  def call(status)
    remove_from_self(status) if status.account.local?
    remove_from_followers(status)
    remove_from_mentioned(status)
    remove_reblogs(status)
    remove_from_hashtags(status)
    remove_from_public(status)

    status.destroy!

    return unless status.account.local?

    Pubsubhubbub::DistributionWorker.perform_async(status.stream_entry.id)
  end

  private

  def remove_from_self(status)
    unpush(:home, status.account, status)
  end

  def remove_from_followers(status)
    status.account.followers.each do |follower|
      next unless follower.local?
      unpush(:home, follower, status)
    end
  end

  def remove_from_mentioned(status)
    notified_domains = []

    status.mentions.each do |mention|
      mentioned_account = mention.account

      if mentioned_account.local?
        unpush(:mentions, mentioned_account, status)
      else
        next if notified_domains.include?(mentioned_account.domain)
        notified_domains << mentioned_account.domain
        send_delete_salmon(mentioned_account, status)
      end
    end
  end

  def send_delete_salmon(account, status)
    return unless status.local?
    NotificationWorker.perform_async(stream_entry_to_xml(status.stream_entry), status.account_id, account.id)
  end

  def remove_reblogs(status)
    status.reblogs.each do |reblog|
      RemoveStatusService.new.call(reblog)
    end
  end

  def unpush(type, receiver, status)
    if status.reblog? && !redis.zscore(FeedManager.instance.key(type, receiver.id), status.reblog_of_id).nil?
      redis.zadd(FeedManager.instance.key(type, receiver.id), status.reblog_of_id, status.reblog_of_id)
    else
      redis.zremrangebyscore(FeedManager.instance.key(type, receiver.id), status.id, status.id)
    end

    Redis.current.publish(receiver.id, Oj.dump(event: :delete, payload: status.id))
  end

  def remove_from_hashtags(status)
    status.tags.each do |tag|
      Redis.current.publish("hashtag:#{tag.name}", Oj.dump(event: :delete, payload: status.id))
    end
  end

  def remove_from_public(status)
    Redis.current.publish('public', Oj.dump(event: :delete, payload: status.id))
  end

  def redis
    Redis.current
  end
end