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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;

/**
* phpbb_visibility
* Handle fetching and setting the visibility for topics and posts
*/
class content_visibility
{
   
/**
    * Database object
    * @var \phpbb\db\driver\driver_interface
    */
   
protected $db;

   
/**
    * User object
    * @var \phpbb\user
    */
   
protected $user;

   
/**
    * Auth object
    * @var \phpbb\auth\auth
    */
   
protected $auth;

   
/**
    * config object
    * @var \phpbb\config\config
    */
   
protected $config;

   
/**
    * Event dispatcher object
    * @var \phpbb\event\dispatcher_interface
    */
   
protected $phpbb_dispatcher;

   
/**
    * phpBB root path
    * @var string
    */
   
protected $phpbb_root_path;

   
/**
    * PHP Extension
    * @var string
    */
   
protected $php_ext;

   
/**
    * Constructor
    *
    * @param    \phpbb\auth\auth        $auth    Auth object
    * @param    \phpbb\config\config    $config    Config object
    * @param    \phpbb\event\dispatcher_interface    $phpbb_dispatcher    Event dispatcher object
    * @param    \phpbb\db\driver\driver_interface    $db        Database object
    * @param    \phpbb\user        $user            User object
    * @param    string        $phpbb_root_path    Root path
    * @param    string        $php_ext            PHP Extension
    * @param    string        $forums_table        Forums table name
    * @param    string        $posts_table        Posts table name
    * @param    string        $topics_table        Topics table name
    * @param    string        $users_table        Users table name
    */
   
public function __construct(\phpbb\auth\auth $auth, \phpbb\config\config $config, \phpbb\event\dispatcher_interface $phpbb_dispatcher, \phpbb\db\driver\driver_interface $db, \phpbb\user $user, $phpbb_root_path, $php_ext, $forums_table, $posts_table, $topics_table, $users_table)
    {
       
$this->auth = $auth;
       
$this->config = $config;
       
$this->phpbb_dispatcher = $phpbb_dispatcher;
       
$this->db = $db;
       
$this->user = $user;
       
$this->phpbb_root_path = $phpbb_root_path;
       
$this->php_ext = $php_ext;
       
$this->forums_table = $forums_table;
       
$this->posts_table = $posts_table;
       
$this->topics_table = $topics_table;
       
$this->users_table = $users_table;
    }

   
/**
    * Can the current logged-in user soft-delete posts?
    *
    * @param $forum_id        int        Forum ID whose permissions to check
    * @param $poster_id        int        Poster ID of the post in question
    * @param $post_locked    bool    Is the post locked?
    * @return bool
    */
   
public function can_soft_delete($forum_id, $poster_id, $post_locked)
    {
        if (
$this->auth->acl_get('m_softdelete', $forum_id))
        {
            return
true;
        }
        else if (
$this->auth->acl_get('f_softdelete', $forum_id) && $poster_id == $this->user->data['user_id'] && !$post_locked)
        {
            return
true;
        }

        return
false;
    }

   
/**
    * Get the topics post count or the forums post/topic count based on permissions
    *
    * @param $mode            string    One of topic_posts, forum_posts or forum_topics
    * @param $data            array    Array with the topic/forum data to calculate from
    * @param $forum_id        int        The forum id is used for permission checks
    * @return int    Number of posts/topics the user can see in the topic/forum
    */
   
public function get_count($mode, $data, $forum_id)
    {
        if (!
$this->auth->acl_get('m_approve', $forum_id))
        {
            return (int)
$data[$mode . '_approved'];
        }

        return (int)
$data[$mode . '_approved'] + (int) $data[$mode . '_unapproved'] + (int) $data[$mode . '_softdeleted'];
    }


   
/**
    * Check topic/post visibility for a given forum ID
    *
    * Note: Read permissions are not checked.
    *
    * @param $mode        string    Either "topic" or "post"
    * @param $forum_id    int        The forum id is used for permission checks
    * @param $data        array    Array with item information to check visibility
    * @return bool        True if the item is visible, false if not
    */
   
public function is_visible($mode, $forum_id, $data)
    {
       
$visibility = $data[$mode . '_visibility'];
       
$poster_key = ($mode === 'topic') ? 'topic_poster' : 'poster_id';
       
$is_visible = ($visibility == ITEM_APPROVED) ||
            (
$this->config['display_unapproved_posts'] &&
                (
$this->user->data['user_id'] != ANONYMOUS) &&
                (
$visibility == ITEM_UNAPPROVED || $visibility == ITEM_REAPPROVE) &&
                (
$this->user->data['user_id'] == $data[$poster_key])) ||
             
$this->auth->acl_get('m_approve', $forum_id);

       
/**
        * Allow changing the result of calling is_visible
        *
        * @event core.phpbb_content_visibility_is_visible
        * @var    bool        is_visible            Default visibility condition, to be modified by extensions if needed.
        * @var    string        mode                Either "topic" or "post"
        * @var    int            forum_id            Forum id of the current item
        * @var    array        data                Array of item information
        * @since 3.2.2-RC1
        */
       
$vars = array(
           
'is_visible',
           
'mode',
           
'forum_id',
           
'data',
        );
       
extract($this->phpbb_dispatcher->trigger_event('core.phpbb_content_visibility_is_visible', compact($vars)));

        return
$is_visible;
    }

   
/**
    * Create topic/post visibility SQL for a given forum ID
    *
    * Note: Read permissions are not checked.
    *
    * @param $mode            string    Either "topic" or "post"
    * @param $forum_id        int        The forum id is used for permission checks
    * @param $table_alias    string    Table alias to prefix in SQL queries
    * @return string    The appropriate combination SQL logic for topic/post_visibility
    */
   
public function get_visibility_sql($mode, $forum_id, $table_alias = '')
    {
       
$where_sql = '';

       
$get_visibility_sql_overwrite = false;

       
/**
        * Allow changing the result of calling get_visibility_sql
        *
        * @event core.phpbb_content_visibility_get_visibility_sql_before
        * @var    string        where_sql                        Extra visibility conditions. It must end with either an SQL "AND" or an "OR"
        * @var    string        mode                            Either "topic" or "post" depending on the query this is being used in
        * @var    array        forum_id                        The forum id in which the search is made.
        * @var    string        table_alias                        Table alias to prefix in SQL queries
        * @var    mixed        get_visibility_sql_overwrite    If a string, forces the function to return get_forums_visibility_sql_overwrite after executing the event
        *                                                     If false, get_visibility_sql continues normally
        *                                                     It must be either boolean or string
        * @since 3.1.4-RC1
        */
       
$vars = array(
           
'where_sql',
           
'mode',
           
'forum_id',
           
'table_alias',
           
'get_visibility_sql_overwrite',
        );
       
extract($this->phpbb_dispatcher->trigger_event('core.phpbb_content_visibility_get_visibility_sql_before', compact($vars)));

        if (
$get_visibility_sql_overwrite !== false)
        {
            return
$get_visibility_sql_overwrite;
        }

        if (
$this->auth->acl_get('m_approve', $forum_id))
        {
           
$where_sql .= '1 = 1';
        }
        else
        {
           
$visibility_query = $table_alias . $mode . '_visibility = ';

           
$where_sql .= '(' . $visibility_query . ITEM_APPROVED . ')';
            if (
$this->config['display_unapproved_posts'] && ($this->user->data['user_id'] != ANONYMOUS))
            {
               
$poster_key = ($mode === 'topic') ? 'topic_poster' : 'poster_id';
               
$where_sql .= ' OR ((' . $visibility_query . ITEM_UNAPPROVED . ' OR ' . $visibility_query . ITEM_REAPPROVE .')';
               
$where_sql .= ' AND ' . $table_alias . $poster_key . ' = ' . ((int) $this->user->data['user_id']) . ')';
            }
        }
        return
'(' . $where_sql . ')';
    }

   
/**
    * Create topic/post visibility SQL for a set of forums
    *
    * Note: Read permissions are not checked. Forums without read permissions
    *        should not be in $forum_ids
    *
    * @param $mode            string    Either "topic" or "post"
    * @param $forum_ids        array    Array of forum ids which the posts/topics are limited to
    * @param $table_alias    string    Table alias to prefix in SQL queries
    * @return string    The appropriate combination SQL logic for topic/post_visibility
    */
   
public function get_forums_visibility_sql($mode, $forum_ids = array(), $table_alias = '')
    {
       
$where_sql = '';

       
$approve_forums = array_keys($this->auth->acl_getf('m_approve', true));
        if (!empty(
$forum_ids) && !empty($approve_forums))
        {
           
$approve_forums = array_intersect($forum_ids, $approve_forums);
           
$forum_ids = array_diff($forum_ids, $approve_forums);
        }

       
$get_forums_visibility_sql_overwrite = false;
       
/**
        * Allow changing the result of calling get_forums_visibility_sql
        *
        * @event core.phpbb_content_visibility_get_forums_visibility_before
        * @var    string        where_sql                            Extra visibility conditions. It must end with either an SQL "AND" or an "OR"
        * @var    string        mode                                Either "topic" or "post" depending on the query this is being used in
        * @var    array        forum_ids                            Array of forum ids which the posts/topics are limited to
        * @var    string        table_alias                            Table alias to prefix in SQL queries
        * @var    array        approve_forums                        Array of forums where the user has m_approve permissions
        * @var    mixed        get_forums_visibility_sql_overwrite    If a string, forces the function to return get_forums_visibility_sql_overwrite after executing the event
        *                                                         If false, get_forums_visibility_sql continues normally
        *                                                         It must be either boolean or string
        * @since 3.1.3-RC1
        */
       
$vars = array(
           
'where_sql',
           
'mode',
           
'forum_ids',
           
'table_alias',
           
'approve_forums',
           
'get_forums_visibility_sql_overwrite',
        );
       
extract($this->phpbb_dispatcher->trigger_event('core.phpbb_content_visibility_get_forums_visibility_before', compact($vars)));

        if (
$get_forums_visibility_sql_overwrite !== false)
        {
            return
$get_forums_visibility_sql_overwrite;
        }

       
// Moderator can view all posts/topics in the moderated forums
       
$where_sql .= '(' . $this->db->sql_in_set($table_alias . 'forum_id', $approve_forums, false, true) . ' OR ';
       
// Normal user can view approved items only
       
$where_sql .= '(' . $table_alias . $mode . '_visibility = ' . ITEM_APPROVED . '
            AND '
. $this->db->sql_in_set($table_alias . 'forum_id', $forum_ids, false, true) . '))';

        return
'(' . $where_sql . ')';
    }

   
/**
    * Create topic/post visibility SQL for all forums on the board
    *
    * Note: Read permissions are not checked. Forums without read permissions
    *        should be in $exclude_forum_ids
    *
    * @param $mode                string    Either "topic" or "post"
    * @param $exclude_forum_ids    array    Array of forum ids which are excluded
    * @param $table_alias        string    Table alias to prefix in SQL queries
    * @return string    The appropriate combination SQL logic for topic/post_visibility
    */
   
public function get_global_visibility_sql($mode, $exclude_forum_ids = array(), $table_alias = '')
    {
       
$where_sqls = array();

       
$approve_forums = array_diff(array_keys($this->auth->acl_getf('m_approve', true)), $exclude_forum_ids);

       
$visibility_sql_overwrite = null;

       
/**
        * Allow changing the result of calling get_global_visibility_sql
        *
        * @event core.phpbb_content_visibility_get_global_visibility_before
        * @var    array        where_sqls                            Array of extra visibility conditions. Will be joined by imploding with "OR".
        * @var    string        mode                                Either "topic" or "post" depending on the query this is being used in
        * @var    array        exclude_forum_ids                    Array of forum ids the current user doesn't have access to
        * @var    string        table_alias                            Table alias to prefix in SQL queries
        * @var    array        approve_forums                        Array of forums where the user has m_approve permissions
        * @var    string        visibility_sql_overwrite            If not empty, forces the function to return visibility_sql_overwrite after executing the event
        * @since 3.1.3-RC1
        */
       
$vars = array(
           
'where_sqls',
           
'mode',
           
'exclude_forum_ids',
           
'table_alias',
           
'approve_forums',
           
'visibility_sql_overwrite',
        );
       
extract($this->phpbb_dispatcher->trigger_event('core.phpbb_content_visibility_get_global_visibility_before', compact($vars)));

        if (
$visibility_sql_overwrite)
        {
            return
$visibility_sql_overwrite;
        }

       
// Include approved items in all forums but the excluded
       
$where_sqls[] = '(' . $this->db->sql_in_set($table_alias . 'forum_id', $exclude_forum_ids, true, true) . '
            AND '
. $table_alias . $mode . '_visibility = ' . ITEM_APPROVED . ')';

       
// If user has moderator permissions, add everything in the moderated forums
       
if (count($approve_forums))
        {
           
$where_sqls[] = $this->db->sql_in_set($table_alias . 'forum_id', $approve_forums);
        }

        return
'(' . implode(' OR ', $where_sqls) . ')';
    }

   
/**
    * Change visibility status of one post or all posts of a topic
    *
    * @param $visibility    int        Element of {ITEM_APPROVED, ITEM_DELETED, ITEM_REAPPROVE}
    * @param $post_id        mixed    Post ID or array of post IDs to act on,
    *                                if it is empty, all posts of topic_id will be modified
    * @param $topic_id        int        Topic where $post_id is found
    * @param $forum_id        int        Forum where $topic_id is found
    * @param $user_id        int        User performing the action
    * @param $time            int        Timestamp when the action is performed
    * @param $reason        string    Reason why the visibility was changed.
    * @param $is_starter    bool    Is this the first post of the topic changed?
    * @param $is_latest        bool    Is this the last post of the topic changed?
    * @param $limit_visibility    mixed    Limit updating per topic_id to a certain visibility
    * @param $limit_delete_time    mixed    Limit updating per topic_id to a certain deletion time
    * @return array        Changed post data, empty array if an error occurred.
    */
   
public function set_post_visibility($visibility, $post_id, $topic_id, $forum_id, $user_id, $time, $reason, $is_starter, $is_latest, $limit_visibility = false, $limit_delete_time = false)
    {
        if (!
in_array($visibility, array(ITEM_APPROVED, ITEM_DELETED, ITEM_REAPPROVE)))
        {
            return array();
        }

        if (
$post_id)
        {
            if (
is_array($post_id))
            {
               
$where_sql = $this->db->sql_in_set('post_id', array_map('intval', $post_id));
            }
            else
            {
               
$where_sql = 'post_id = ' . (int) $post_id;
            }
           
$where_sql .= ' AND topic_id = ' . (int) $topic_id;
        }
        else
        {
           
$where_sql = 'topic_id = ' . (int) $topic_id;

           
// Limit the posts to a certain visibility and deletion time
            // This allows us to only restore posts, that were approved
            // when the topic got soft deleted. So previous soft deleted
            // and unapproved posts are still soft deleted/unapproved
           
if ($limit_visibility !== false)
            {
               
$where_sql .= ' AND post_visibility = ' . (int) $limit_visibility;
            }

            if (
$limit_delete_time !== false)
            {
               
$where_sql .= ' AND post_delete_time = ' . (int) $limit_delete_time;
            }
        }

       
$sql = 'SELECT poster_id, post_id, post_postcount, post_visibility
            FROM '
. $this->posts_table . '
            WHERE '
. $where_sql;
       
$result = $this->db->sql_query($sql);

       
$post_ids = $poster_postcounts = $postcounts = $postcount_visibility = array();
        while (
$row = $this->db->sql_fetchrow($result))
        {
           
$post_ids[] = (int) $row['post_id'];

            if (
$row['post_visibility'] != $visibility)
            {
                if (
$row['post_postcount'] && !isset($poster_postcounts[(int) $row['poster_id']]))
                {
                   
$poster_postcounts[(int) $row['poster_id']] = 1;
                }
                else if (
$row['post_postcount'])
                {
                   
$poster_postcounts[(int) $row['poster_id']]++;
                }

                if (!isset(
$postcount_visibility[$row['post_visibility']]))
                {
                   
$postcount_visibility[$row['post_visibility']] = 1;
                }
                else
                {
                   
$postcount_visibility[$row['post_visibility']]++;
                }
            }
        }
       
$this->db->sql_freeresult($result);

        if (empty(
$post_ids))
        {
            return array();
        }

        if (!
function_exists('truncate_string'))
        {
            include(
$this->phpbb_root_path . 'includes/functions_content.' . $this->php_ext);
        }

       
$data = array(
           
'post_visibility'        => (int) $visibility,
           
'post_delete_user'        => (int) $user_id,
           
'post_delete_time'        => ((int) $time) ?: time(),
           
'post_delete_reason'    => truncate_string($reason, 255, 255, false),
        );
       
/**
         * Perform actions right before the query to change post visibility
         *
         * @event core.set_post_visibility_before_sql
         * @var            int            visibility        Element of {ITEM_APPROVED, ITEM_DELETED, ITEM_REAPPROVE}
         * @var            array        post_id            Array containing all post IDs to be modified. If blank, all posts within the topic are modified.
         * @var            int            topic_id        Topic of the post IDs to be modified.
         * @var            int            forum_id        Forum ID that the topic_id resides in.
         * @var            int            user_id            User ID doing this action.
         * @var            int            time            Timestamp of this action.
         * @var            string        reason            Reason specified by the user for this change.
         * @var            bool        is_starter        Are we changing the topic's starter?
         * @var            bool        is_latest        Are we changing the topic's latest post?
         * @var            array        data            The data array for this action.
         * @since 3.1.10-RC1
         * @changed 3.2.2-RC1 Use time instead of non-existent timestamp
         */
       
$vars = array(
           
'visibility',
           
'post_id',
           
'topic_id',
           
'forum_id',
           
'user_id',
           
'time',
           
'reason',
           
'is_starter',
           
'is_latest',
           
'data',
        );
       
extract($this->phpbb_dispatcher->trigger_event('core.set_post_visibility_before_sql', compact($vars)));
       
$sql = 'UPDATE ' . $this->posts_table . '
            SET '
. $this->db->sql_build_array('UPDATE', $data) . '
            WHERE '
. $this->db->sql_in_set('post_id', $post_ids);
       
$this->db->sql_query($sql);

       
// Group the authors by post count, to reduce the number of queries
       
foreach ($poster_postcounts as $poster_id => $num_posts)
        {
           
$postcounts[$num_posts][] = $poster_id;
        }

       
// Update users postcounts
       
foreach ($postcounts as $num_posts => $poster_ids)
        {
            if (
in_array($visibility, array(ITEM_REAPPROVE, ITEM_DELETED)))
            {
               
$sql = 'UPDATE ' . $this->users_table . '
                    SET user_posts = 0
                    WHERE '
. $this->db->sql_in_set('user_id', $poster_ids) . '
                        AND user_posts < '
. $num_posts;
               
$this->db->sql_query($sql);

               
$sql = 'UPDATE ' . $this->users_table . '
                    SET user_posts = user_posts - '
. $num_posts . '
                    WHERE '
. $this->db->sql_in_set('user_id', $poster_ids) . '
                        AND user_posts >= '
. $num_posts;
               
$this->db->sql_query($sql);
            }
            else
            {
               
$sql = 'UPDATE ' . $this->users_table . '
                    SET user_posts = user_posts + '
. $num_posts . '
                    WHERE '
. $this->db->sql_in_set('user_id', $poster_ids);
               
$this->db->sql_query($sql);
            }
        }

       
$update_topic_postcount = true;

       
// Sync the first/last topic information if needed
       
if (!$is_starter && $is_latest)
        {
            if (!
function_exists('update_post_information'))
            {
                include(
$this->phpbb_root_path . 'includes/functions_posting.' . $this->php_ext);
            }

           
// update_post_information can only update the last post info ...
           
if ($topic_id)
            {
               
update_post_information('topic', $topic_id, false);
            }
            if (
$forum_id)
            {
               
update_post_information('forum', $forum_id, false);
            }
        }
        else if (
$is_starter && $topic_id)
        {
            if (!
function_exists('sync'))
            {
                include(
$this->phpbb_root_path . 'includes/functions_admin.' . $this->php_ext);
            }

           
// ... so we need to use sync, if the first post is changed.
            // The forum is resynced recursive by sync() itself.
           
sync('topic', 'topic_id', $topic_id, true);

           
// sync recalculates the topic replies and forum posts by itself, so we don't do that.
           
$update_topic_postcount = false;
        }

       
$topic_update_array = array();
       
// Update the topic's reply count and the forum's post count
       
if ($update_topic_postcount)
        {
           
$field_alias = array(
               
ITEM_APPROVED    => 'posts_approved',
               
ITEM_UNAPPROVED    => 'posts_unapproved',
               
ITEM_DELETED    => 'posts_softdeleted',
               
ITEM_REAPPROVE    => 'posts_unapproved',
            );
           
$cur_posts = array_fill_keys($field_alias, 0);

            foreach (
$postcount_visibility as $post_visibility => $visibility_posts)
            {
               
$cur_posts[$field_alias[(int) $post_visibility]] += $visibility_posts;
            }

           
$sql_ary = array();
           
$recipient_field = $field_alias[$visibility];

            foreach (
$cur_posts as $field => $count)
            {
               
// Decrease the count for the old statuses.
               
if ($count && $field != $recipient_field)
                {
                   
$sql_ary[$field] = " - $count";
                }
            }
           
// Add up the count from all statuses excluding the recipient status.
           
$count_increase = array_sum(array_diff($cur_posts, array($recipient_field)));

            if (
$count_increase)
            {
               
$sql_ary[$recipient_field] = " + $count_increase";
            }

            if (
count($sql_ary))
            {
               
$forum_sql = array();

                foreach (
$sql_ary as $field => $value_change)
                {
                   
$topic_update_array[] = 'topic_' . $field . ' = topic_' . $field . $value_change;
                   
$forum_sql[] = 'forum_' . $field . ' = forum_' . $field . $value_change;
                }

               
$sql = 'UPDATE ' . $this->forums_table . '
                    SET '
. implode(', ', $forum_sql) . '
                    WHERE forum_id = '
. (int) $forum_id;
               
$this->db->sql_query($sql);
            }
        }

        if (
$post_id)
        {
           
$sql = 'SELECT 1 AS has_attachments
                FROM '
. POSTS_TABLE . '
                WHERE topic_id = '
. (int) $topic_id . '
                    AND post_attachment = 1
                    AND post_visibility = '
. ITEM_APPROVED . '
                    AND '
. $this->db->sql_in_set('post_id', $post_id, true);
           
$result = $this->db->sql_query_limit($sql, 1);

           
$has_attachment = (bool) $this->db->sql_fetchfield('has_attachments');
           
$this->db->sql_freeresult($result);

            if (
$has_attachment && $visibility == ITEM_APPROVED)
            {
               
$topic_update_array[] = 'topic_attachment = 1';
            }
            else if (!
$has_attachment && $visibility != ITEM_APPROVED)
            {
               
$topic_update_array[] = 'topic_attachment = 0';
            }
        }

        if (!empty(
$topic_update_array))
        {
           
// Update the number for replies and posts, and update the attachments flag
           
$sql = 'UPDATE ' . $this->topics_table . '
                SET '
. implode(', ', $topic_update_array) . '
                WHERE topic_id = '
. (int) $topic_id;
           
$this->db->sql_query($sql);
        }
       
/**
         * Perform actions after all steps to changing post visibility
         *
         * @event core.set_post_visibility_after
         * @var            int            visibility        Element of {ITEM_APPROVED, ITEM_DELETED, ITEM_REAPPROVE}
         * @var            array        post_id            Array containing all post IDs to be modified. If blank, all posts within the topic are modified.
         * @var            int            topic_id        Topic of the post IDs to be modified.
         * @var            int            forum_id        Forum ID that the topic_id resides in.
         * @var            int            user_id            User ID doing this action.
         * @var            int            time            Timestamp of this action.
         * @var            string        reason            Reason specified by the user for this change.
         * @var            bool        is_starter        Are we changing the topic's starter?
         * @var            bool        is_latest        Are we changing the topic's latest post?
         * @var            array        data            The data array for this action.
         * @since 3.1.10-RC1
         * @changed 3.2.2-RC1 Use time instead of non-existent timestamp
         */
       
$vars = array(
           
'visibility',
           
'post_id',
           
'topic_id',
           
'forum_id',
           
'user_id',
           
'time',
           
'reason',
           
'is_starter',
           
'is_latest',
           
'data',
        );
       
extract($this->phpbb_dispatcher->trigger_event('core.set_post_visibility_after', compact($vars)));
        return
$data;
    }

   
/**
    * Set topic visibility
    *
    * Allows approving (which is akin to undeleting/restore) or soft deleting an entire topic.
    * Calls set_post_visibility as needed.
    *
    * Note: By default, when a soft deleted topic is restored. Only posts that
    *        were approved at the time of soft deleting, are being restored.
    *        Same applies to soft deleting. Only approved posts will be marked
    *        as soft deleted.
    *        If you want to update all posts, use the force option.
    *
    * @param $visibility    int        Element of {ITEM_APPROVED, ITEM_DELETED, ITEM_REAPPROVE}
    * @param $topic_id        mixed    Topic ID to act on
    * @param $forum_id        int        Forum where $topic_id is found
    * @param $user_id        int        User performing the action
    * @param $time            int        Timestamp when the action is performed
    * @param $reason        string    Reason why the visibilty was changed.
    * @param $force_update_all    bool    Force to update all posts within the topic
    * @return array        Changed topic data, empty array if an error occurred.
    */
   
public function set_topic_visibility($visibility, $topic_id, $forum_id, $user_id, $time, $reason, $force_update_all = false)
    {
        if (!
in_array($visibility, array(ITEM_APPROVED, ITEM_DELETED, ITEM_REAPPROVE)))
        {
            return array();
        }

        if (!
$force_update_all)
        {
           
$sql = 'SELECT topic_visibility, topic_delete_time
                FROM '
. $this->topics_table . '
                WHERE topic_id = '
. (int) $topic_id;
           
$result = $this->db->sql_query($sql);
           
$original_topic_data = $this->db->sql_fetchrow($result);
           
$this->db->sql_freeresult($result);

            if (!
$original_topic_data)
            {
               
// The topic does not exist...
               
return array();
            }
        }

        if (!
function_exists('truncate_string'))
        {
            include(
$this->phpbb_root_path . 'includes/functions_content.' . $this->php_ext);
        }

       
// Note, we do not set a reason for the posts, just for the topic
       
$data = array(
           
'topic_visibility'        => (int) $visibility,
           
'topic_delete_user'        => (int) $user_id,
           
'topic_delete_time'        => ((int) $time) ?: time(),
           
'topic_delete_reason'    => truncate_string($reason, 255, 255, false),
        );
       
/**
         * Perform actions right before the query to change topic visibility
         *
         * @event core.set_topic_visibility_before_sql
         * @var            int            visibility            Element of {ITEM_APPROVED, ITEM_DELETED, ITEM_REAPPROVE}
         * @var            int            topic_id            Topic of the post IDs to be modified.
         * @var            int            forum_id            Forum ID that the topic_id resides in.
         * @var            int            user_id                User ID doing this action.
         * @var            int            time                Timestamp of this action.
         * @var            string        reason                Reason specified by the user for this change.
         * @var            bool        force_update_all    Force an update on all posts within the topic, regardless of their current approval state.
         * @var            array        data                The data array for this action.
         * @since 3.1.10-RC1
         * @changed 3.2.2-RC1 Use time instead of non-existent timestamp
         */
       
$vars = array(
           
'visibility',
           
'topic_id',
           
'forum_id',
           
'user_id',
           
'time',
           
'reason',
           
'force_update_all',
           
'data',
        );
       
extract($this->phpbb_dispatcher->trigger_event('core.set_topic_visibility_before_sql', compact($vars)));
       
$sql = 'UPDATE ' . $this->topics_table . '
            SET '
. $this->db->sql_build_array('UPDATE', $data) . '
            WHERE topic_id = '
. (int) $topic_id;
       
$this->db->sql_query($sql);

        if (!
$this->db->sql_affectedrows())
        {
            return array();
        }

        if (!
$force_update_all && $original_topic_data['topic_delete_time'] && $original_topic_data['topic_visibility'] == ITEM_DELETED && $visibility == ITEM_APPROVED)
        {
           
// If we're restoring a topic we only restore posts, that were soft deleted through the topic soft deletion.
           
$this->set_post_visibility($visibility, false, $topic_id, $forum_id, $user_id, $time, '', true, true, $original_topic_data['topic_visibility'], $original_topic_data['topic_delete_time']);
        }
        else if (!
$force_update_all && $original_topic_data['topic_visibility'] == ITEM_APPROVED && $visibility == ITEM_DELETED)
        {
           
// If we're soft deleting a topic we only mark approved posts as soft deleted.
           
$this->set_post_visibility($visibility, false, $topic_id, $forum_id, $user_id, $time, '', true, true, $original_topic_data['topic_visibility']);
        }
        else
        {
           
$this->set_post_visibility($visibility, false, $topic_id, $forum_id, $user_id, $time, '', true, true);
        }
       
/**
         * Perform actions after all steps to changing topic visibility
         *
         * @event core.set_topic_visibility_after
         * @var            int            visibility            Element of {ITEM_APPROVED, ITEM_DELETED, ITEM_REAPPROVE}
         * @var            int            topic_id            Topic of the post IDs to be modified.
         * @var            int            forum_id            Forum ID that the topic_id resides in.
         * @var            int            user_id                User ID doing this action.
         * @var            int            time                Timestamp of this action.
         * @var            string        reason                Reason specified by the user for this change.
         * @var            bool        force_update_all    Force an update on all posts within the topic, regardless of their current approval state.
         * @var            array        data                The data array for this action.
         * @since 3.1.10-RC1
         * @changed 3.2.2-RC1 Use time instead of non-existent timestamp
         */
       
$vars = array(
           
'visibility',
           
'topic_id',
           
'forum_id',
           
'user_id',
           
'time',
           
'reason',
           
'force_update_all',
           
'data',
        );
       
extract($this->phpbb_dispatcher->trigger_event('core.set_topic_visibility_after', compact($vars)));
        return
$data;
    }

   
/**
    * Add post to topic and forum statistics
    *
    * @param $data            array    Contains information from the topics table about given topic
    * @param $sql_data        array    Populated with the SQL changes, may be empty at call time (by reference)
    * @return null
    */
   
public function add_post_to_statistic($data, &$sql_data)
    {
       
$sql_data[$this->topics_table] = (($sql_data[$this->topics_table]) ? $sql_data[$this->topics_table] . ', ' : '') . 'topic_posts_approved = topic_posts_approved + 1';

       
$sql_data[$this->forums_table] = (($sql_data[$this->forums_table]) ? $sql_data[$this->forums_table] . ', ' : '') . 'forum_posts_approved = forum_posts_approved + 1';

        if (
$data['post_postcount'])
        {
           
$sql_data[$this->users_table] = (($sql_data[$this->users_table]) ? $sql_data[$this->users_table] . ', ' : '') . 'user_posts = user_posts + 1';
        }

       
$this->config->increment('num_posts', 1, false);
    }

   
/**
    * Remove post from topic and forum statistics
    *
    * @param $data            array    Contains information from the topics table about given topic
    * @param $sql_data        array    Populated with the SQL changes, may be empty at call time (by reference)
    * @return null
    */
   
public function remove_post_from_statistic($data, &$sql_data)
    {
        if (
$data['post_visibility'] == ITEM_APPROVED)
        {
           
$sql_data[$this->topics_table] = ((!empty($sql_data[$this->topics_table])) ? $sql_data[$this->topics_table] . ', ' : '') . 'topic_posts_approved = topic_posts_approved - 1';
           
$sql_data[$this->forums_table] = ((!empty($sql_data[$this->forums_table])) ? $sql_data[$this->forums_table] . ', ' : '') . 'forum_posts_approved = forum_posts_approved - 1';

            if (
$data['post_postcount'])
            {
               
$sql_data[$this->users_table] = ((!empty($sql_data[$this->users_table])) ? $sql_data[$this->users_table] . ', ' : '') . 'user_posts = user_posts - 1';
            }

           
$this->config->increment('num_posts', -1, false);
        }
        else if (
$data['post_visibility'] == ITEM_UNAPPROVED || $data['post_visibility'] == ITEM_REAPPROVE)
        {
           
$sql_data[FORUMS_TABLE] = (($sql_data[FORUMS_TABLE]) ? $sql_data[FORUMS_TABLE] . ', ' : '') . 'forum_posts_unapproved = forum_posts_unapproved - 1';
           
$sql_data[TOPICS_TABLE] = (($sql_data[TOPICS_TABLE]) ? $sql_data[TOPICS_TABLE] . ', ' : '') . 'topic_posts_unapproved = topic_posts_unapproved - 1';
        }
        else if (
$data['post_visibility'] == ITEM_DELETED)
        {
           
$sql_data[FORUMS_TABLE] = (($sql_data[FORUMS_TABLE]) ? $sql_data[FORUMS_TABLE] . ', ' : '') . 'forum_posts_softdeleted = forum_posts_softdeleted - 1';
           
$sql_data[TOPICS_TABLE] = (($sql_data[TOPICS_TABLE]) ? $sql_data[TOPICS_TABLE] . ', ' : '') . 'topic_posts_softdeleted = topic_posts_softdeleted - 1';
        }
    }

   
/**
    * Remove topic from forum statistics
    *
    * @param $data            array    Post and topic data
    * @param $sql_data        array    Populated with the SQL changes, may be empty at call time (by reference)
    * @return null
    */
   
public function remove_topic_from_statistic($data, &$sql_data)
    {
        if (
$data['topic_visibility'] == ITEM_APPROVED)
        {
           
$sql_data[FORUMS_TABLE] .= 'forum_posts_approved = forum_posts_approved - 1, forum_topics_approved = forum_topics_approved - 1';

            if (
$data['post_postcount'])
            {
               
$sql_data[$this->users_table] = ((!empty($sql_data[$this->users_table])) ? $sql_data[$this->users_table] . ', ' : '') . 'user_posts = user_posts - 1';
            }
        }
        else if (
$data['topic_visibility'] == ITEM_UNAPPROVED || $data['post_visibility'] == ITEM_REAPPROVE)
        {
           
$sql_data[FORUMS_TABLE] .= 'forum_posts_unapproved = forum_posts_unapproved - 1, forum_topics_unapproved = forum_topics_unapproved - 1';
        }
        else if (
$data['topic_visibility'] == ITEM_DELETED)
        {
           
$sql_data[FORUMS_TABLE] .= 'forum_posts_softdeleted = forum_posts_softdeleted - 1, forum_topics_softdeleted = forum_topics_softdeleted - 1';
        }

    }
}