trabajo-afectivo/app/policies/ticket/article_policy.rb

class Ticket::ArticlePolicy < ApplicationPolicy

  def show?
    access?(__method__)
  end

  def create?
    access?(__method__)
  end

  def update?
    return false if !access?(__method__)
    return true if user.permissions?(['ticket.agent', 'admin'])

    not_authorized('ticket.agent or admin permission required')
  end

  def destroy?
    return false if !access?('show?')

    # agents can destroy articles of type 'note'
    # which were created by themselves within the last x minutes

    if !user.permissions?('ticket.agent')
      return not_authorized('agent permission required')
    end

    if record.created_by_id != user.id
      return not_authorized('you can only delete your own notes')
    end

    if record.type.communication? && !record.internal?
      return not_authorized('communication articles cannot be deleted')
    end

    if deletable_timeframe? && record.created_at <= deletable_timeframe.ago
      return not_authorized('note is too old to be deleted')
    end

    true
  end

  private

  def deletable_timeframe_setting
    Setting.get('ui_ticket_zoom_article_delete_timeframe')
  end

  def deletable_timeframe?
    deletable_timeframe_setting&.positive?
  end

  def deletable_timeframe
    deletable_timeframe_setting.seconds
  end

  def access?(query)
    ticket = Ticket.lookup(id: record.ticket_id)
    return false if record.internal == true && !TicketPolicy.new(user, ticket).agent_read_access?

    Pundit.authorize(user, ticket, query)
  end
end