mastodon/app/models/status.rb

# frozen_string_literal: true
# == Schema Information
#
# Table name: statuses
#
#  id                     :integer          not null, primary key
#  uri                    :string
#  text                   :text             default(""), not null
#  created_at             :datetime         not null
#  updated_at             :datetime         not null
#  in_reply_to_id         :integer
#  reblog_of_id           :integer
#  url                    :string
#  sensitive              :boolean          default(FALSE), not null
#  visibility             :integer          default("public"), not null
#  spoiler_text           :text             default(""), not null
#  reply                  :boolean          default(FALSE), not null
#  favourites_count       :integer          default(0), not null
#  reblogs_count          :integer          default(0), not null
#  language               :string
#  conversation_id        :integer
#  local                  :boolean
#  account_id             :integer          not null
#  application_id         :integer
#  in_reply_to_account_id :integer
#  local_only             :boolean
#

class Status < ApplicationRecord
  include Paginable
  include Streamable
  include Cacheable
  include StatusThreadingConcern

  update_index('statuses#status', :proper) if Chewy.enabled?

  enum visibility: [:public, :unlisted, :private, :direct], _suffix: :visibility

  belongs_to :application, class_name: 'Doorkeeper::Application', optional: true

  belongs_to :account, inverse_of: :statuses, counter_cache: true
  belongs_to :in_reply_to_account, foreign_key: 'in_reply_to_account_id', class_name: 'Account', optional: true
  belongs_to :conversation, optional: true

  belongs_to :thread, foreign_key: 'in_reply_to_id', class_name: 'Status', inverse_of: :replies, optional: true
  belongs_to :reblog, foreign_key: 'reblog_of_id', class_name: 'Status', inverse_of: :reblogs, counter_cache: :reblogs_count, optional: true

  has_many :favourites, inverse_of: :status, dependent: :destroy
  has_many :reblogs, foreign_key: 'reblog_of_id', class_name: 'Status', inverse_of: :reblog, dependent: :destroy
  has_many :replies, foreign_key: 'in_reply_to_id', class_name: 'Status', inverse_of: :thread
  has_many :mentions, dependent: :destroy
  has_many :media_attachments, dependent: :destroy

  has_and_belongs_to_many :tags
  has_and_belongs_to_many :preview_cards

  has_one :notification, as: :activity, dependent: :destroy
  has_one :stream_entry, as: :activity, inverse_of: :status

  validates :uri, uniqueness: true, presence: true, unless: :local?
  validates :text, presence: true, unless: :reblog?
  validates_with StatusLengthValidator
  validates :reblog, uniqueness: { scope: :account }, if: :reblog?

  default_scope { recent }

  scope :recent, -> { reorder(id: :desc) }
  scope :remote, -> { where(local: false).or(where.not(uri: nil)) }
  scope :local,  -> { where(local: true).or(where(uri: nil)) }

  scope :without_replies, -> { where('statuses.reply = FALSE OR statuses.in_reply_to_account_id = statuses.account_id') }
  scope :without_reblogs, -> { where('statuses.reblog_of_id IS NULL') }
  scope :with_public_visibility, -> { where(visibility: :public) }
  scope :tagged_with, ->(tag) { joins(:statuses_tags).where(statuses_tags: { tag_id: tag }) }
  scope :excluding_silenced_accounts, -> { left_outer_joins(:account).where(accounts: { silenced: false }) }
  scope :including_silenced_accounts, -> { left_outer_joins(:account).where(accounts: { silenced: true }) }
  scope :not_excluded_by_account, ->(account) { where.not(account_id: account.excluded_from_timeline_account_ids) }
  scope :not_domain_blocked_by_account, ->(account) { account.excluded_from_timeline_domains.blank? ? left_outer_joins(:account) : left_outer_joins(:account).where('accounts.domain IS NULL OR accounts.domain NOT IN (?)', account.excluded_from_timeline_domains) }

  scope :not_local_only, -> { where(local_only: [false, nil]) }

  cache_associated :account, :application, :media_attachments, :conversation, :tags, :stream_entry, mentions: :account, reblog: [:account, :application, :stream_entry, :tags, :media_attachments, :conversation, mentions: :account], thread: :account

  delegate :domain, to: :account, prefix: true

  REAL_TIME_WINDOW = 6.hours

  def searchable_by(preloaded = nil)
    ids = [account_id]

    if preloaded.nil?
      ids += mentions.pluck(:account_id)
      ids += favourites.pluck(:account_id)
      ids += reblogs.pluck(:account_id)
    else
      ids += preloaded.mentions[id] || []
      ids += preloaded.favourites[id] || []
      ids += preloaded.reblogs[id] || []
    end

    ids.uniq
  end

  def reply?
    !in_reply_to_id.nil? || attributes['reply']
  end

  def local?
    attributes['local'] || uri.nil?
  end

  def reblog?
    !reblog_of_id.nil?
  end

  def within_realtime_window?
    created_at >= REAL_TIME_WINDOW.ago
  end

  def verb
    if destroyed?
      :delete
    else
      reblog? ? :share : :post
    end
  end

  def object_type
    reply? ? :comment : :note
  end

  def proper
    reblog? ? reblog : self
  end

  def content
    proper.text
  end

  def target
    reblog
  end

  def title
    if destroyed?
      "#{account.acct} deleted status"
    else
      reblog? ? "#{account.acct} shared a status by #{reblog.account.acct}" : "New status by #{account.acct}"
    end
  end

  def hidden?
    private_visibility? || direct_visibility?
  end

  def non_sensitive_with_media?
    !sensitive? && media_attachments.any?
  end

  def emojis
    CustomEmoji.from_text([spoiler_text, text].join(' '), account.domain)
  end

  after_create_commit :store_uri, if: :local?
  after_create_commit :update_statistics, if: :local?

  around_create Mastodon::Snowflake::Callbacks

  before_create :set_locality

  before_validation :prepare_contents, if: :local?
  before_validation :set_reblog
  before_validation :set_visibility
  before_validation :set_conversation
  before_validation :set_sensitivity
  before_validation :set_local

  class << self
    def not_in_filtered_languages(account)
      where(language: nil).or where.not(language: account.filtered_languages)
    end

    def as_home_timeline(account)
      where(account: [account] + account.following).where(visibility: [:public, :unlisted, :private])
    end

    def as_direct_timeline(account)
      query = joins("LEFT OUTER JOIN mentions ON statuses.id = mentions.status_id AND mentions.account_id = #{account.id}")
              .where("mentions.account_id = #{account.id} OR statuses.account_id = #{account.id}")
              .where(visibility: [:direct])

      apply_timeline_filters(query, account, false)
    end

    def as_public_timeline(account = nil, local_only = false)
      query = timeline_scope(local_only).without_replies

      apply_timeline_filters(query, account, local_only)
    end

    def as_tag_timeline(tag, account = nil, local_only = false)
      query = timeline_scope(local_only).tagged_with(tag)

      apply_timeline_filters(query, account, local_only)
    end

    def as_outbox_timeline(account)
      where(account: account, visibility: :public)
    end

    def favourites_map(status_ids, account_id)
      Favourite.select('status_id').where(status_id: status_ids).where(account_id: account_id).map { |f| [f.status_id, true] }.to_h
    end

    def reblogs_map(status_ids, account_id)
      select('reblog_of_id').where(reblog_of_id: status_ids).where(account_id: account_id).reorder(nil).map { |s| [s.reblog_of_id, true] }.to_h
    end

    def mutes_map(conversation_ids, account_id)
      ConversationMute.select('conversation_id').where(conversation_id: conversation_ids).where(account_id: account_id).map { |m| [m.conversation_id, true] }.to_h
    end

    def pins_map(status_ids, account_id)
      StatusPin.select('status_id').where(status_id: status_ids).where(account_id: account_id).map { |p| [p.status_id, true] }.to_h
    end

    def reload_stale_associations!(cached_items)
      account_ids = []

      cached_items.each do |item|
        account_ids << item.account_id
        account_ids << item.reblog.account_id if item.reblog?
      end

      account_ids.uniq!

      return if account_ids.empty?

      accounts = Account.where(id: account_ids).map { |a| [a.id, a] }.to_h

      cached_items.each do |item|
        item.account = accounts[item.account_id]
        item.reblog.account = accounts[item.reblog.account_id] if item.reblog?
      end
    end

    def permitted_for(target_account, account)
      visibility = [:public, :unlisted]

      if account.nil?
        where(visibility: visibility).not_local_only
      elsif target_account.blocking?(account) # get rid of blocked peeps
        none
      elsif account.id == target_account.id # author can see own stuff
        all
      else
        # followers can see followers-only stuff, but also things they are mentioned in.
        # non-followers can see everything that isn't private/direct, but can see stuff they are mentioned in.
        visibility.push(:private) if account.following?(target_account)

        where(visibility: visibility).or(where(id: account.mentions.select(:status_id)))
      end
    end

    private

    def timeline_scope(local_only = false)
      starting_scope = local_only ? Status.local : Status
      starting_scope
        .with_public_visibility
        .without_reblogs
    end

    def apply_timeline_filters(query, account, local_only)
      if account.nil?
        filter_timeline_default(query)
      else
        filter_timeline_for_account(query, account, local_only)
      end
    end

    def filter_timeline_for_account(query, account, local_only)
      query = query.not_excluded_by_account(account)
      query = query.not_domain_blocked_by_account(account) unless local_only
      query = query.not_in_filtered_languages(account) if account.filtered_languages.present?
      query.merge(account_silencing_filter(account))
    end

    def filter_timeline_default(query)
      query.not_local_only.excluding_silenced_accounts
    end

    def account_silencing_filter(account)
      if account.silenced?
        including_silenced_accounts
      else
        excluding_silenced_accounts
      end
    end
  end

  def marked_local_only?
    # match both with and without U+FE0F (the emoji variation selector)
    /#{local_only_emoji}\ufe0f?\z/.match?(content)
  end

  def local_only_emoji
    '👁'
  end

  private

  def store_uri
    update_attribute(:uri, ActivityPub::TagManager.instance.uri_for(self)) if uri.nil?
  end

  def prepare_contents
    text&.strip!
    spoiler_text&.strip!
  end

  def set_reblog
    self.reblog = reblog.reblog if reblog? && reblog.reblog?
  end

  def set_visibility
    self.visibility = (account.locked? ? :private : :public) if visibility.nil?
    self.visibility = reblog.visibility if reblog?
    self.sensitive  = false if sensitive.nil?
  end

  def set_sensitivity
    self.sensitive = sensitive || spoiler_text.present?
  end

  def set_locality
    if account.domain.nil? && !attribute_changed?(:local_only)
      self.local_only = marked_local_only?
    end
  end

  def set_conversation
    self.reply = !(in_reply_to_id.nil? && thread.nil?) unless reply

    if reply? && !thread.nil?
      self.in_reply_to_account_id = carried_over_reply_to_account_id
      self.conversation_id        = thread.conversation_id if conversation_id.nil?
    elsif conversation_id.nil?
      create_conversation
    end
  end

  def carried_over_reply_to_account_id
    if thread.account_id == account_id && thread.reply?
      thread.in_reply_to_account_id
    else
      thread.account_id
    end
  end

  def set_local
    self.local = account.local?
  end

  def update_statistics
    return unless public_visibility? || unlisted_visibility?
    ActivityTracker.increment('activity:statuses:local')
  end
end