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<?php
/**
 *
 * This file is part of the phpBB Forum Software package.
 *
 * @copyright (c) phpBB Limited <https://www.phpbb.com>
 * @license GNU General Public License, version 2 (GPL-2.0)
 *
 * For full copyright and license information, please see
 * the docs/CREDITS.txt file.
 *
 */
namespace phpbb\feed;
use phpbb\feed\exception\no_feed_exception;
use phpbb\feed\exception\no_topic_exception;
use phpbb\feed\exception\unauthorized_forum_exception;
use phpbb\feed\exception\unauthorized_topic_exception;
/**
 * Topic feed for a specific topic
 *
 * This will give you the last {$this->num_items} posts made within this topic.
 */
class topic extends post_base
{
    protected $topic_id        = 0;
    protected $forum_id        = 0;
    protected $topic_data    = array();
    /**
     * Set the Topic ID
     *
     * @param int    $topic_id            Topic ID
     * @return    \phpbb\feed\topic
     */
    public function set_topic_id($topic_id)
    {
        $this->topic_id = (int) $topic_id;
        return $this;
    }
    /**
     * {@inheritdoc}
     */
    public function open()
    {
        $sql = 'SELECT f.forum_options, f.forum_password, t.topic_id, t.forum_id, t.topic_visibility, t.topic_title, t.topic_time, t.topic_views, t.topic_posts_approved, t.topic_type
            FROM ' . TOPICS_TABLE . ' t
            LEFT JOIN ' . FORUMS_TABLE . ' f
                ON (f.forum_id = t.forum_id)
            WHERE t.topic_id = ' . $this->topic_id;
        $result = $this->db->sql_query($sql);
        $this->topic_data = $this->db->sql_fetchrow($result);
        $this->db->sql_freeresult($result);
        if (empty($this->topic_data))
        {
            throw new no_topic_exception($this->topic_id);
        }
        $this->forum_id = (int) $this->topic_data['forum_id'];
        // Make sure topic is either approved or user authed
        if ($this->topic_data['topic_visibility'] != ITEM_APPROVED && !$this->auth->acl_get('m_approve', $this->forum_id))
        {
            if ($this->user->data['user_id'] != ANONYMOUS)
            {
                send_status_line(403, 'Forbidden');
            }
            else
            {
                send_status_line(401, 'Unauthorized');
            }
            throw new unauthorized_topic_exception($this->topic_id);
        }
        // Make sure forum is not excluded from feed
        if (phpbb_optionget(FORUM_OPTION_FEED_EXCLUDE, $this->topic_data['forum_options']))
        {
            throw new no_feed_exception();
        }
        // Make sure we can read this forum
        if (!$this->auth->acl_get('f_read', $this->forum_id))
        {
            if ($this->user->data['user_id'] != ANONYMOUS)
            {
                send_status_line(403, 'Forbidden');
            }
            else
            {
                send_status_line(401, 'Unauthorized');
            }
            throw new unauthorized_forum_exception($this->forum_id);
        }
        // Make sure forum is not passworded or user is authed
        if ($this->topic_data['forum_password'])
        {
            $forum_ids_passworded = $this->get_passworded_forums();
            if (isset($forum_ids_passworded[$this->forum_id]))
            {
                if ($this->user->data['user_id'] != ANONYMOUS)
                {
                    send_status_line(403, 'Forbidden');
                }
                else
                {
                    send_status_line(401, 'Unauthorized');
                }
                throw new unauthorized_forum_exception($this->forum_id);
            }
            unset($forum_ids_passworded);
        }
        parent::open();
    }
    /**
     * {@inheritdoc}
     */
    protected function get_sql()
    {
        parent::fetch_attachments();
        $this->sql = array(
            'SELECT'    =>    'p.post_id, p.post_time, p.post_edit_time, p.post_visibility, p.post_subject, p.post_text, p.bbcode_bitfield, p.bbcode_uid, p.enable_bbcode, p.enable_smilies, p.enable_magic_url, p.post_attachment, ' .
                'u.username, u.user_id',
            'FROM'        => array(
                POSTS_TABLE        => 'p',
                USERS_TABLE        => 'u',
            ),
            'WHERE'        => 'p.topic_id = ' . $this->topic_id . '
                                AND ' . $this->content_visibility->get_visibility_sql('post', $this->forum_id, 'p.') . '
                                AND p.poster_id = u.user_id',
            'ORDER_BY'    => 'p.post_time DESC, p.post_id DESC',
        );
        return true;
    }
    /**
     * {@inheritdoc}
     */
    public function adjust_item(&$item_row, &$row)
    {
        parent::adjust_item($item_row, $row);
        $item_row['forum_id'] = $this->forum_id;
    }
    /**
     * {@inheritdoc}
     */
    public function get_item()
    {
        return ($row = parent::get_item()) ? array_merge($this->topic_data, $row) : $row;
    }
}