mastodon/app/services/report_service.rb

# frozen_string_literal: true

class ReportService < BaseService
  include Payloadable

  def call(source_account, target_account, options = {})
    @source_account = source_account
    @target_account = target_account
    @status_ids     = options.delete(:status_ids).presence || []
    @collection_ids = options.delete(:collection_ids).presence || []
    @comment        = options.delete(:comment).presence || ''
    @category       = options[:rule_ids].present? ? 'violation' : (options.delete(:category).presence || 'other')
    @rule_ids       = options.delete(:rule_ids).presence
    @application    = options.delete(:application).presence
    @options        = options

    raise ActiveRecord::RecordNotFound if @target_account.unavailable?

    create_report!
    notify_staff!

    if forward?
      forward_to_origin!
      forward_to_replied_to!
    end

    @report
  end

  private

  def create_report!
    @report = @source_account.reports.create!(
      target_account: @target_account,
      status_ids: reported_status_ids,
      collection_ids: reported_collection_ids,
      comment: @comment,
      uri: @options[:uri],
      forwarded: forward_to_origin?,
      category: @category,
      rule_ids: @rule_ids,
      application: @application
    )
  end

  def notify_staff!
    return if @report.unresolved_siblings?

    User.those_who_can(:manage_reports).includes(:account).find_each do |u|
      LocalNotificationWorker.perform_async(u.account_id, @report.id, 'Report', 'admin.report')
      AdminMailer.with(recipient: u.account).new_report(@report).deliver_later if u.allows_report_emails?
    end
  end

  def forward_to_origin!
    return unless forward_to_origin?

    # Send report to the server where the account originates from
    ActivityPub::DeliveryWorker.perform_async(payload, some_local_account.id, @target_account.inbox_url)
  end

  def forward_to_replied_to!
    # Send report to servers to which the account was replying to, so they also have a chance to act
    inbox_urls = Account.remote.where(domain: forward_to_domains).where(id: Status.where(id: reported_status_ids).where.not(in_reply_to_account_id: nil).select(:in_reply_to_account_id)).inboxes - [@target_account.inbox_url, @target_account.shared_inbox_url]

    inbox_urls.each do |inbox_url|
      ActivityPub::DeliveryWorker.perform_async(payload, some_local_account.id, inbox_url)
    end
  end

  def forward?
    !@target_account.local? && ActiveModel::Type::Boolean.new.cast(@options[:forward])
  end

  def forward_to_origin?
    forward? && forward_to_domains.include?(@target_account.domain)
  end

  def forward_to_domains
    @forward_to_domains ||= (@options[:forward_to_domains] || [@target_account.domain]).filter_map { |domain| TagManager.instance.normalize_domain(domain) }.uniq
  end

  def reported_status_ids
    return AccountStatusesFilter.new(@target_account, @source_account).results.with_discarded.find(Array(@status_ids)).pluck(:id) if @source_account.local?

    # If the account making reports is remote, it is likely anonymized so we have to relax the requirements for attaching statuses.
    domain = @source_account.domain.to_s.downcase
    has_followers = @target_account.followers.with_domain(domain).exists?
    visibility = has_followers ? %i(public unlisted private) : %i(public unlisted)
    scope = @target_account.statuses.with_discarded
    scope.merge!(scope.where(visibility: visibility).or(scope.where(domain_mentions(domain))))
    # Allow missing posts to not drop reports that include e.g. a deleted post
    scope.where(id: Array(@status_ids)).pluck(:id)
  end

  def domain_mentions(domain)
    Mention
      .joins(:account)
      .where(Account.arel_table[:domain].lower.eq domain)
      .select(1).arel.exists
  end

  def reported_collection_ids
    @target_account.collections.find(Array(@collection_ids)).pluck(:id)
  end

  def payload
    serialize_payload(@report, ActivityPub::FlagSerializer, account: some_local_account).to_json
  end

  def some_local_account
    @some_local_account ||= Account.representative
  end
end