mastodon/app/lib/tag_manager.rb

# frozen_string_literal: true

require 'singleton'

class TagManager
  include Singleton
  include RoutingHelper

  VERBS = {
    post:       'http://activitystrea.ms/schema/1.0/post',
    share:      'http://activitystrea.ms/schema/1.0/share',
    favorite:   'http://activitystrea.ms/schema/1.0/favorite',
    unfavorite: 'http://activitystrea.ms/schema/1.0/unfavorite',
    delete:     'http://activitystrea.ms/schema/1.0/delete',
    follow:     'http://activitystrea.ms/schema/1.0/follow',
    unfollow:   'http://ostatus.org/schema/1.0/unfollow',
    block:      'http://mastodon.social/schema/1.0/block',
    unblock:    'http://mastodon.social/schema/1.0/unblock',
  }.freeze

  TYPES = {
    activity:   'http://activitystrea.ms/schema/1.0/activity',
    note:       'http://activitystrea.ms/schema/1.0/note',
    comment:    'http://activitystrea.ms/schema/1.0/comment',
    person:     'http://activitystrea.ms/schema/1.0/person',
    collection: 'http://activitystrea.ms/schema/1.0/collection',
    group:      'http://activitystrea.ms/schema/1.0/group',
  }.freeze

  COLLECTIONS = {
    public: 'http://activityschema.org/collection/public',
  }.freeze

  XMLNS       = 'http://www.w3.org/2005/Atom'
  MEDIA_XMLNS = 'http://purl.org/syndication/atommedia'
  AS_XMLNS    = 'http://activitystrea.ms/spec/1.0/'
  THR_XMLNS   = 'http://purl.org/syndication/thread/1.0'
  POCO_XMLNS  = 'http://portablecontacts.net/spec/1.0'
  DFRN_XMLNS  = 'http://purl.org/macgirvin/dfrn/1.0'
  OS_XMLNS    = 'http://ostatus.org/schema/1.0'

  def unique_tag(date, id, type)
    "tag:#{Rails.configuration.x.local_domain},#{date.strftime('%Y-%m-%d')}:objectId=#{id}:objectType=#{type}"
  end

  def unique_tag_to_local_id(tag, expected_type)
    matches = Regexp.new("objectId=([\\d]+):objectType=#{expected_type}").match(tag)
    return matches[1] unless matches.nil?
  end

  def local_id?(id)
    id.start_with?("tag:#{Rails.configuration.x.local_domain}")
  end

  def local_domain?(domain)
    domain.nil? || domain.gsub(/[\/]/, '').casecmp(Rails.configuration.x.local_domain).zero?
  end

  def uri_for(target)
    return target.uri if target.respond_to?(:local?) && !target.local?

    case target.object_type
    when :person
      account_url(target)
    else
      unique_tag(target.stream_entry.created_at, target.stream_entry.activity_id, target.stream_entry.activity_type)
    end
  end

  def url_for(target)
    return target.url if target.respond_to?(:local?) && !target.local?

    case target.object_type
    when :person
      account_url(target)
    else
      account_stream_entry_url(target.account, target.stream_entry)
    end
  end
end