10 files changed, 308 insertions, 0 deletions
diff --git a/phpBB/adm/style/acp_forums.html b/phpBB/adm/style/acp_forums.html
index e8b20007dc..0bb5e10f57 100644
--- a/phpBB/adm/style/acp_forums.html
+++ b/phpBB/adm/style/acp_forums.html
@@ -278,6 +278,19 @@
 			<dd><label><input type="radio" class="radio" name="prune_sticky" value="1"<!-- IF S_PRUNE_STICKY --> id="prune_sticky" checked="checked"<!-- ENDIF --> /> {L_YES}</label>
 				<label><input type="radio" class="radio" name="prune_sticky" value="0"<!-- IF not S_PRUNE_STICKY --> id="prune_sticky" checked="checked"<!-- ENDIF --> /> {L_NO}</label></dd>
 		</dl>
+		<dl>
+			<dt><label for="enable_shadow_prune">{L_FORUM_PRUNE_SHADOW}{L_COLON}</label><br /><span>{L_FORUM_PRUNE_SHADOW_EXPLAIN}</span></dt>
+			<dd><label><input type="radio" class="radio" name="enable_shadow_prune" value="1"<!-- IF S_PRUNE_SHADOW_ENABLE --> id="enable_shadow_prune" checked="checked"<!-- ENDIF --> /> {L_YES}</label>
+				<label><input type="radio" class="radio" name="enable_shadow_prune" value="0"<!-- IF not S_PRUNE_SHADOW_ENABLE --> id="enable_shadow_prune" checked="checked"<!-- ENDIF --> /> {L_NO}</label></dd>
+		</dl>
+		<dl>
+			<dt><label for="prune_shadow_freq">{L_AUTO_PRUNE_FREQ}{L_COLON}</label><br /><span>{L_AUTO_PRUNE_FREQ_EXPLAIN}</span></dt>
+			<dd><input type="number" id="prune_shadow_freq" name="prune_shadow_freq" value="{PRUNE_FREQ}" maxlength="4" size="4" min="0" max="9999" /> {L_DAYS}</dd>
+		</dl>
+		<dl>
+			<dt><label for="prune_shadow_days">{L_AUTO_PRUNE_DAYS}{L_COLON}</label><br /><span>{L_AUTO_PRUNE_DAYS_EXPLAIN}</span></dt>
+			<dd><input type="number" id="prune_shadow_days" name="prune_shadow_days" value="{PRUNE_DAYS}" maxlength="4" size="4" min="0" max="9999" /> {L_DAYS}</dd>
+		</dl>
 		</fieldset>
 	</div>
 
diff --git a/phpBB/config/cron_tasks.yml b/phpBB/config/cron_tasks.yml
index fd3aea85dc..4fa5d1440e 100644
--- a/phpBB/config/cron_tasks.yml
+++ b/phpBB/config/cron_tasks.yml
@@ -23,6 +23,19 @@ services:
         tags:
             - { name: cron.task }
 
+    cron.task.core.prune_shadow_topics:
+        class: phpbb\cron\task\core\prune_shadow_topics
+        arguments:
+            - %core.root_path%
+            - %core.php_ext%
+            - @config
+            - @dbal.conn
+            - @log
+        calls:
+            - [set_name, [cron.task.core.prune_shadow_topics]]
+        tags:
+            - { name: cron.task }
+
     cron.task.core.prune_notifications:
         class: phpbb\cron\task\core\prune_notifications
         arguments:
diff --git a/phpBB/includes/acp/acp_forums.php b/phpBB/includes/acp/acp_forums.php
index a1af8c489d..c47d9bc185 100644
--- a/phpBB/includes/acp/acp_forums.php
+++ b/phpBB/includes/acp/acp_forums.php
@@ -138,12 +138,15 @@ class acp_forums
 						'enable_prune'			=> request_var('enable_prune', false),
 						'enable_post_review'	=> request_var('enable_post_review', true),
 						'enable_quick_reply'	=> request_var('enable_quick_reply', false),
+						'enable_shadow_prune'		=> request_var('enable_shadow_prune', false),
 						'prune_days'			=> request_var('prune_days', 7),
 						'prune_viewed'			=> request_var('prune_viewed', 7),
 						'prune_freq'			=> request_var('prune_freq', 1),
 						'prune_old_polls'		=> request_var('prune_old_polls', false),
 						'prune_announce'		=> request_var('prune_announce', false),
 						'prune_sticky'			=> request_var('prune_sticky', false),
+						'prune_shadow_days'		=> request_var('prune_shadow_days', 7),
+						'prune_shadow_freq'		=> request_var('prune_shadow_freq', 1),
 						'forum_password'		=> request_var('forum_password', '', true),
 						'forum_password_confirm'=> request_var('forum_password_confirm', '', true),
 						'forum_password_unset'	=> request_var('forum_password_unset', false),
@@ -457,6 +460,9 @@ class acp_forums
 							'prune_days'			=> 7,
 							'prune_viewed'			=> 7,
 							'prune_freq'			=> 1,
+							'enable_shadow_prune'		=> false,
+							'prune_shadow_days'		=> 7,
+							'prune_shadow_freq'		=> 1,
 							'forum_flags'			=> FORUM_FLAG_POST_REVIEW + FORUM_FLAG_ACTIVE_TOPICS,
 							'forum_options'			=> 0,
 							'forum_password'		=> '',
@@ -636,6 +642,8 @@ class acp_forums
 					'PRUNE_FREQ'				=> $forum_data['prune_freq'],
 					'PRUNE_DAYS'				=> $forum_data['prune_days'],
 					'PRUNE_VIEWED'				=> $forum_data['prune_viewed'],
+					'PRUNE_SHADOW_FREQ'			=> $forum_data['prune_shadow_freq'],
+					'PRUNE_SHADOW_DAYS'			=> $forum_data['prune_shadow_days'],
 					'TOPICS_PER_PAGE'			=> $forum_data['forum_topics_per_page'],
 					'FORUM_RULES_LINK'			=> $forum_data['forum_rules_link'],
 					'FORUM_RULES'				=> $forum_data['forum_rules'],
@@ -668,6 +676,7 @@ class acp_forums
 					'S_DISPLAY_SUBFORUM_LIST'	=> ($forum_data['display_subforum_list']) ? true : false,
 					'S_DISPLAY_ON_INDEX'		=> ($forum_data['display_on_index']) ? true : false,
 					'S_PRUNE_ENABLE'			=> ($forum_data['enable_prune']) ? true : false,
+					'S_PRUNE_SHADOW_ENABLE'			=> ($forum_data['enable_shadow_prune']) ? true : false,
 					'S_FORUM_LINK_TRACK'		=> ($forum_data['forum_flags'] & FORUM_FLAG_LINK_TRACK) ? true : false,
 					'S_PRUNE_OLD_POLLS'			=> ($forum_data['forum_flags'] & FORUM_FLAG_PRUNE_POLL) ? true : false,
 					'S_PRUNE_ANNOUNCE'			=> ($forum_data['forum_flags'] & FORUM_FLAG_PRUNE_ANNOUNCE) ? true : false,
diff --git a/phpBB/includes/functions_admin.php b/phpBB/includes/functions_admin.php
index 81a381b326..2bf8e6dcf0 100644
--- a/phpBB/includes/functions_admin.php
+++ b/phpBB/includes/functions_admin.php
@@ -2326,6 +2326,11 @@ function prune($forum_id, $prune_mode, $prune_date, $prune_flags = 0, $auto_sync
 		$sql_and .= " AND topic_last_view_time < $prune_date";
 	}
 
+	if ($prune_mode == 'shadow')
+	{
+		$sql_and .= ' AND topic_status = ' . ITEM_MOVED . " AND topic_last_post_time < $prune_date";
+	}
+
 	$sql = 'SELECT topic_id
 		FROM ' . TOPICS_TABLE . '
 		WHERE ' . $db->sql_in_set('forum_id', $forum_id) . "
diff --git a/phpBB/install/schemas/schema.json b/phpBB/install/schemas/schema.json
index 15d2fd6e84..176691f1a6 100644
--- a/phpBB/install/schemas/schema.json
+++ b/phpBB/install/schemas/schema.json
@@ -800,6 +800,22 @@
                 "UINT:20",
                 0
             ],
+            "enable_shadow_prune": [
+                "BOOL",
+                0
+            ],
+            "prune_shadow_days": [
+                "UINT",
+                7
+            ],
+            "prune_shadow_freq": [
+                "UINT",
+                1
+            ],
+            "prune_shadow_next": [
+                "INT:11",
+                0
+            ],
             "forum_posts_approved": [
                 "UINT",
                 0
diff --git a/phpBB/language/en/acp/common.php b/phpBB/language/en/acp/common.php
index cf32c7c225..2dc58d8361 100644
--- a/phpBB/language/en/acp/common.php
+++ b/phpBB/language/en/acp/common.php
@@ -676,6 +676,7 @@ $lang = array_merge($lang, array(
 
 	'LOG_PRUNE'					=> '<strong>Pruned forums</strong><br />» %s',
 	'LOG_AUTO_PRUNE'			=> '<strong>Auto-pruned forums</strong><br />» %s',
+	'LOG_PRUNE_SHADOW'		=> '<strong>Auto-pruned shadow topics</strong><br />» %s',
 	'LOG_PRUNE_USER_DEAC'		=> '<strong>Users deactivated</strong><br />» %s',
 	'LOG_PRUNE_USER_DEL_DEL'	=> '<strong>Users pruned and posts deleted</strong><br />» %s',
 	'LOG_PRUNE_USER_DEL_ANON'	=> '<strong>Users pruned and posts retained</strong><br />» %s',
diff --git a/phpBB/language/en/acp/forums.php b/phpBB/language/en/acp/forums.php
index 756cb7ae0f..d64380b6b6 100644
--- a/phpBB/language/en/acp/forums.php
+++ b/phpBB/language/en/acp/forums.php
@@ -101,6 +101,8 @@ $lang = array_merge($lang, array(
 	'FORUM_PASSWORD_OLD'				=> 'The forum password is using an old hashing method and should be changed.',
 	'FORUM_PASSWORD_MISMATCH'			=> 'The passwords you entered did not match.',
 	'FORUM_PRUNE_SETTINGS'				=> 'Forum prune settings',
+	'FORUM_PRUNE_SHADOW'				=> 'Enable auto-pruning of shadow topics',
+	'FORUM_PRUNE_SHADOW_EXPLAIN'			=> 'Prunes the forum of shadow topics, set the frequency/age parameters below.',
 	'FORUM_RESYNCED'					=> 'Forum “%s” successfully resynced',
 	'FORUM_RULES_EXPLAIN'				=> 'Forum rules are displayed at any page within the given forum.',
 	'FORUM_RULES_LINK'					=> 'Link to forum rules',
diff --git a/phpBB/phpbb/cron/task/core/prune_shadow_topics.php b/phpBB/phpbb/cron/task/core/prune_shadow_topics.php
new file mode 100644
index 0000000000..b30e665a87
--- /dev/null
+++ b/phpBB/phpbb/cron/task/core/prune_shadow_topics.php
@@ -0,0 +1,191 @@
+<?php
+/**
+*
+* @package phpBB3
+* @copyright (c) 2014 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+namespace phpbb\cron\task\core;
+
+/**
+* Prune one forum of its shadow topics cron task.
+*
+* It is intended to be used when cron is invoked via web.
+* This task can decide whether it should be run using data obtained by viewforum
+* code, without making additional database queries.
+*
+* @package phpBB3
+*/
+class prune_shadow_topics extends \phpbb\cron\task\base implements \phpbb\cron\task\parametrized
+{
+	protected $phpbb_root_path;
+	protected $php_ext;
+	protected $config;
+	protected $db;
+	protected $log;
+
+	/**
+	* If $forum_data is given, it is assumed to contain necessary information
+	* about a single forum that is to be pruned.
+	*
+	* If $forum_data is not given, forum id will be retrieved via request_var
+	* and a database query will be performed to load the necessary information
+	* about the forum.
+	*/
+	protected $forum_data;
+
+	/**
+	* Constructor.
+	*
+	* @param string $phpbb_root_path The root path
+	* @param string $php_ext The PHP extension
+	* @param \phpbb\config\config $config The config
+	* @param \phpbb\db\driver\driver $db The db connection
+	* @param \phpbb\log\log $log The phpBB log system
+	*/
+	public function __construct($phpbb_root_path, $php_ext, \phpbb\config\config $config, \phpbb\db\driver\driver $db, \phpbb\log\log $log)
+	{
+		$this->phpbb_root_path = $phpbb_root_path;
+		$this->php_ext = $php_ext;
+		$this->config = $config;
+		$this->db = $db;
+		$this->log = $log;
+	}
+
+	/**
+	* Manually set forum data.
+	*
+	* @param array $forum_data Information about a forum to be pruned.
+	*/
+	public function set_forum_data($forum_data)
+	{
+		$this->forum_data = $forum_data;
+	}
+
+	/**
+	* Runs this cron task.
+	*
+	* @return null
+	*/
+	public function run()
+	{
+		if (!function_exists('auto_prune'))
+		{
+			include($this->phpbb_root_path . 'includes/functions_admin.' . $this->php_ext);
+		}
+
+		if ($this->forum_data['prune_shadow_days'])
+		{
+			$this->auto_prune_shadow_topics($this->forum_data['forum_id'], 'shadow', $this->forum_data['forum_flags'], $this->forum_data['prune_shadow_days'], $this->forum_data['prune_shadow_freq']);
+		}
+	}
+
+	/**
+	* Returns whether this cron task can run, given current board configuration.
+	*
+	* This cron task will not run when system cron is utilised, as in
+	* such cases prune_all_forums task would run instead.
+	*
+	* Additionally, this task must be given the forum data, either via
+	* the constructor or parse_parameters method.
+	*
+	* @return bool
+	*/
+	public function is_runnable()
+	{
+		return !$this->config['use_system_cron'] && $this->forum_data;
+	}
+
+	/**
+	* Returns whether this cron task should run now, because enough time
+	* has passed since it was last run.
+	*
+	* Forum pruning interval is specified in the forum data.
+	*
+	* @return bool
+	*/
+	public function should_run()
+	{
+		return $this->forum_data['enable_shadow_prune'] && $this->forum_data['prune_shadow_next'] < time();
+	}
+
+	/**
+	* Returns parameters of this cron task as an array.
+	* The array has one key, f, whose value is id of the forum to be pruned.
+	*
+	* @return array
+	*/
+	public function get_parameters()
+	{
+		return array('f' => $this->forum_data['forum_id']);
+	}
+
+	/**
+	* Parses parameters found in $request, which is an instance of
+	* \phpbb\request\request_interface.
+	*
+	* It is expected to have a key f whose value is id of the forum to be pruned.
+	*
+	* @param \phpbb\request\request_interface $request Request object.
+	*
+	* @return null
+	*/
+	public function parse_parameters(\phpbb\request\request_interface $request)
+	{
+		$this->forum_data = null;
+		if ($request->is_set('f'))
+		{
+			$forum_id = $request->variable('f', 0);
+
+			$sql = 'SELECT forum_id, prune_shadow_next, enable_shadow_prune, prune_shadow_days, forum_flags, prune_shadow_freq
+				FROM ' . FORUMS_TABLE . "
+				WHERE forum_id = $forum_id";
+			$result = $this->db->sql_query($sql);
+			$row = $this->db->sql_fetchrow($result);
+			$this->db->sql_freeresult($result);
+
+			if ($row)
+			{
+				$this->forum_data = $row;
+			}
+		}
+	}
+
+	/**
+	* Automatically prune shadow topics
+	* Based on fuunction auto_prune()
+	* @param int $forum_id Forum ID of forum that should be pruned
+	* @param string $prune_mode Prune mode
+	* @param int $prune_flags Prune flags
+	* @param int $prune_freq Prune frequency
+	* @return null
+	*/
+	protected function auto_prune_shadow_topics($forum_id, $prune_mode, $prune_flags, $prune_days, $prune_freq)
+	{
+		$sql = 'SELECT forum_name
+			FROM ' . FORUMS_TABLE . "
+			WHERE forum_id = $forum_id";
+		$result = $this->db->sql_query($sql, 3600);
+		$row = $this->db->sql_fetchrow($result);
+		$this->db->sql_freeresult($result);
+
+		if ($row)
+		{
+			$prune_date = time() - ($prune_days * 86400);
+			$next_prune = time() + ($prune_freq * 86400);
+
+			prune($forum_id, $prune_mode, $prune_date, $prune_flags, true);
+
+			$sql = 'UPDATE ' . FORUMS_TABLE . "
+				SET prune_shadow_next = $next_prune
+				WHERE forum_id = $forum_id";
+			$this->db->sql_query($sql);
+
+			$this->log->add('admin', 'LOG_PRUNE_SHADOW', $row['forum_name']);
+		}
+
+		return;
+	}
+}
diff --git a/phpBB/phpbb/db/migration/data/v310/prune_shadow_topics.php b/phpBB/phpbb/db/migration/data/v310/prune_shadow_topics.php
new file mode 100644
index 0000000000..83f5f903e8
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v310/prune_shadow_topics.php
@@ -0,0 +1,46 @@
+<?php
+/**
+*
+* @package migration
+* @copyright (c) 2014 phpBB Group
+* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
+*
+*/
+
+namespace phpbb\db\migration\data\v310;
+
+class prune_shadow_topics extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array('\phpbb\db\migration\data\v310\dev');
+	}
+
+	public function update_schema()
+	{
+		return array(
+			'add_columns'		=> array(
+				$this->table_prefix . 'forums'		=> array(
+					'enable_shadow_prune'	=> array('BOOL', 0),
+					'prune_shadow_days'	=> array('UINT', 7),
+					'prune_shadow_freq'	=> array('UINT', 1),
+					'prune_shadow_next'	=> array('INT:11', 0),
+				),
+			),
+		);
+	}
+
+	public function revert_schema()
+	{
+		return array(
+			'drop_columns'		=> array(
+				$this->table_prefix . 'forums'		=> array(
+					'enable_shadow_prune',
+					'prune_shadow_days',
+					'prune_shadow_freq',
+					'prune_shadow_next',
+				),
+			),
+		);
+	}
+}
diff --git a/phpBB/viewforum.php b/phpBB/viewforum.php
index 7f194bbcef..4da0267284 100644
--- a/phpBB/viewforum.php
+++ b/phpBB/viewforum.php
@@ -224,6 +224,18 @@ if (!$config['use_system_cron'])
 		$url = $task->get_url();
 		$template->assign_var('RUN_CRON_TASK', '<img src="' . $url . '" width="1" height="1" alt="cron" />');
 	}
+	else
+	{
+		// See if we should prune the shadow topics instead
+		$task = $cron->find_task('cron.task.core.prune_shadow_topics');
+		$task->set_forum_data($forum_data);
+
+		if ($task->is_ready())
+		{
+			$url = $task->get_url();
+			$template->assign_var('RUN_CRON_TASK', '<img src="' . $url . '" width="1" height="1" alt="cron" />');
+		}
+	}
 }
 
 // Forum rules and subscription info