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CRAP
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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;
/**
* Abstract class for feeds displaying attachments
*/
abstract class attachments_base extends base
{
    /**
    * Attachments that may be displayed
    */
    protected $attachments = array();
    /**
    * Retrieve the list of attachments that may be displayed
    *
    * @param array $post_ids Specify for which post IDs to fetch the attachments (optional)
    * @param array $topic_ids Specify for which topic IDs to fetch the attachments (optional)
    */
    protected function fetch_attachments($post_ids = array(), $topic_ids = array())
    {
        $sql_array = array(
            'SELECT'   => 'a.*',
            'FROM'     => array(
                ATTACHMENTS_TABLE => 'a'
            ),
            'WHERE'    => 'a.in_message = 0 ',
            'ORDER_BY' => 'a.filetime DESC, a.post_msg_id ASC',
        );
        if (!empty($post_ids))
        {
            $sql_array['WHERE'] .= 'AND ' . $this->db->sql_in_set('a.post_msg_id', $post_ids);
        }
        else if (!empty($topic_ids))
        {
            if (isset($this->topic_id))
            {
                $topic_ids[] = $this->topic_id;
            }
            $sql_array['WHERE'] .= 'AND ' . $this->db->sql_in_set('a.topic_id', $topic_ids);
        }
        else if (isset($this->topic_id))
        {
            $sql_array['WHERE'] .= 'AND a.topic_id = ' . (int) $this->topic_id;
        }
        else if (isset($this->forum_id))
        {
            $sql_array['LEFT_JOIN'] = array(
                array(
                    'FROM' => array(TOPICS_TABLE => 't'),
                    'ON'   => 'a.topic_id = t.topic_id',
                )
            );
            $sql_array['WHERE'] .= 'AND t.forum_id = ' . (int) $this->forum_id;
        }
        else
        {
            // Do not allow querying the full attachments table
            throw new \RuntimeException($this->user->lang('INVALID_FEED_ATTACHMENTS'));
        }
        $sql = $this->db->sql_build_query('SELECT', $sql_array);
        $result = $this->db->sql_query($sql);
        // Set attachments in feed items
        while ($row = $this->db->sql_fetchrow($result))
        {
            $this->attachments[$row['post_msg_id']][] = $row;
        }
        $this->db->sql_freeresult($result);
    }
    /**
    * Get attachments related to a given post
    *
    * @param $post_id  int  Post id
    * @return mixed Attachments related to $post_id
    */
    public function get_attachments($post_id)
    {
        return $this->attachments[$post_id];
    }
}