viewtopic.php

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<?php
/***************************************************************************
 *                               viewtopic.php
 *                            -------------------
 *   begin                : Saturday, Feb 13, 2001
 *   copyright            : (C) 2001 The phpBB Group
 *   email                : support@phpbb.com
 *
 *   $Id: viewtopic.php,v 1.1.1.1 2003/02/11 22:27:28 wei.gao Exp $
 *
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

define('IN_PHPBB', true);
$phpbb_root_path = './';
include($phpbb_root_path . 'extension.inc');
include($phpbb_root_path . 'common.'.$phpEx);
include($phpbb_root_path . 'includes/bbcode.'.$phpEx);

//
// Start initial var setup
//
if ( isset($HTTP_GET_VARS[POST_TOPIC_URL]) )
{
	$topic_id = intval($HTTP_GET_VARS[POST_TOPIC_URL]);
}
else if ( isset($HTTP_GET_VARS['topic']) )
{
	$topic_id = intval($HTTP_GET_VARS['topic']);
}

if ( isset($HTTP_GET_VARS[POST_POST_URL]))
{
	$post_id = intval($HTTP_GET_VARS[POST_POST_URL]);
}

$start = ( isset($HTTP_GET_VARS['start']) ) ? intval($HTTP_GET_VARS['start']) : 0;

if ( !isset($topic_id) && !isset($post_id) )
{
	message_die(GENERAL_MESSAGE, 'Topic_post_not_exist');
}

//
// Find topic id if user requested a newer
// or older topic
//
if ( isset($HTTP_GET_VARS['view']) && empty($HTTP_GET_VARS[POST_POST_URL]) )
{
	if ( $HTTP_GET_VARS['view'] == 'newest' )
	{
		if ( isset($HTTP_COOKIE_VARS[$board_config['cookie_name'] . '_sid']) || isset($HTTP_GET_VARS['sid']) )
		{
			$session_id = isset($HTTP_COOKIE_VARS[$board_config['cookie_name'] . '_sid']) ? $HTTP_COOKIE_VARS[$board_config['cookie_name'] . '_sid'] : $HTTP_GET_VARS['sid'];

			if ( $session_id )
			{
				$sql = "SELECT p.post_id
					FROM " . POSTS_TABLE . " p, " . SESSIONS_TABLE . " s,  " . USERS_TABLE . " u
					WHERE s.session_id = '$session_id'
						AND u.user_id = s.session_user_id
						AND p.topic_id = $topic_id
						AND p.post_time >= u.user_lastvisit
					ORDER BY p.post_time ASC
					LIMIT 1";
				if ( !($result = $db->sql_query($sql)) )
				{
					message_die(GENERAL_ERROR, 'Could not obtain newer/older topic information', '', __LINE__, __FILE__, $sql);
				}

				if ( !($row = $db->sql_fetchrow($result)) )
				{
					message_die(GENERAL_MESSAGE, 'No_new_posts_last_visit');
				}

				$post_id = $row['post_id'];

				if (isset($HTTP_GET_VARS['sid']))
				{
					redirect("viewtopic.$phpEx?sid=$session_id&" . POST_POST_URL . "=$post_id#$post_id");
				}
				else
				{
					redirect("viewtopic.$phpEx?" . POST_POST_URL . "=$post_id#$post_id");
				}
			}
		}

		redirect(append_sid("viewtopic.$phpEx?" . POST_TOPIC_URL . "=$topic_id", true));
	}
	else if ( $HTTP_GET_VARS['view'] == 'next' || $HTTP_GET_VARS['view'] == 'previous' )
	{
		$sql_condition = ( $HTTP_GET_VARS['view'] == 'next' ) ? '>' : '<';
		$sql_ordering = ( $HTTP_GET_VARS['view'] == 'next' ) ? 'ASC' : 'DESC';

		$sql = "SELECT t.topic_id
			FROM " . TOPICS_TABLE . " t, " . TOPICS_TABLE . " t2, " . POSTS_TABLE . " p, " . POSTS_TABLE . " p2
			WHERE t2.topic_id = $topic_id
				AND p2.post_id = t2.topic_last_post_id
				AND t.forum_id = t2.forum_id
				AND p.post_id = t.topic_last_post_id
				AND p.post_time $sql_condition p2.post_time
				AND p.topic_id = t.topic_id
			ORDER BY p.post_time $sql_ordering
			LIMIT 1";
		if ( !($result = $db->sql_query($sql)) )
		{
			message_die(GENERAL_ERROR, "Could not obtain newer/older topic information", '', __LINE__, __FILE__, $sql);
		}

		if ( $row = $db->sql_fetchrow($result) )
		{
			$topic_id = intval($row['topic_id']);
		}
		else
		{
			$message = ( $HTTP_GET_VARS['view'] == 'next' ) ? 'No_newer_topics' : 'No_older_topics';
			message_die(GENERAL_MESSAGE, $message);
		}
	}
}

//
// This rather complex gaggle of code handles querying for topics but
// also allows for direct linking to a post (and the calculation of which
// page the post is on and the correct display of viewtopic)
//
$join_sql_table = ( !isset($post_id) ) ? '' : ", " . POSTS_TABLE . " p, " . POSTS_TABLE . " p2 ";
$join_sql = ( !isset($post_id) ) ? "t.topic_id = $topic_id" : "p.post_id = $post_id AND t.topic_id = p.topic_id AND p2.topic_id = p.topic_id AND p2.post_id <= $post_id";
$count_sql = ( !isset($post_id) ) ? '' : ", COUNT(p2.post_id) AS prev_posts";

$order_sql = ( !isset($post_id) ) ? '' : "GROUP BY p.post_id, t.topic_id, t.topic_title, t.topic_status, t.topic_replies, t.topic_time, t.topic_type, t.topic_vote, t.topic_last_post_id, f.forum_name, f.forum_status, f.forum_id, f.auth_view, f.auth_read, f.auth_post, f.auth_reply, f.auth_edit, f.auth_delete, f.auth_sticky, f.auth_announce, f.auth_pollcreate, f.auth_vote, f.auth_attachments ORDER BY p.post_id ASC";

$sql = "SELECT t.topic_id, t.topic_title, t.topic_status, t.topic_replies, t.topic_time, t.topic_type, t.topic_vote, t.topic_last_post_id, f.forum_name, f.forum_status, f.forum_id, f.auth_view, f.auth_read, f.auth_post, f.auth_reply, f.auth_edit, f.auth_delete, f.auth_sticky, f.auth_announce, f.auth_pollcreate, f.auth_vote, f.auth_attachments" . $count_sql . "
	FROM " . TOPICS_TABLE . " t, " . FORUMS_TABLE . " f" . $join_sql_table . "
	WHERE $join_sql
		AND f.forum_id = t.forum_id
		$order_sql";
attach_setup_viewtopic_auth($order_sql, $sql);
if ( !($result = $db->sql_query($sql)) )
{
	message_die(GENERAL_ERROR, "Could not obtain topic information", '', __LINE__, __FILE__, $sql);
}

if ( !($forum_topic_data = $db->sql_fetchrow($result)) )
{
	message_die(GENERAL_MESSAGE, 'Topic_post_not_exist');
}

$forum_id = intval($forum_topic_data['forum_id']);

//
// Start session management
//
$userdata = session_pagestart($user_ip, $forum_id);
init_userprefs($userdata);
//
// End session management
//

//
// Start auth check
//
$is_auth = array();
$is_auth = auth(AUTH_ALL, $forum_id, $userdata, $forum_topic_data);

if( !$is_auth['auth_view'] || !$is_auth['auth_read'] )
{
	if ( !$userdata['session_logged_in'] )
	{
		$redirect = ( isset($post_id) ) ? POST_POST_URL . "=$post_id" : POST_TOPIC_URL . "=$topic_id";
		$redirect .= ( isset($start) ) ? "&start=$start" : '';
		redirect(append_sid("login.$phpEx?redirect=viewtopic.$phpEx&$redirect", true));
	}

	$message = ( !$is_auth['auth_view'] ) ? $lang['Topic_post_not_exist'] : sprintf($lang['Sorry_auth_read'], $is_auth['auth_read_type']);

	message_die(GENERAL_MESSAGE, $message);
}
//
// End auth check
//

$forum_name = $forum_topic_data['forum_name'];
$topic_title = $forum_topic_data['topic_title'];
$topic_id = intval($forum_topic_data['topic_id']);
$topic_time = $forum_topic_data['topic_time'];

if ( !empty($post_id) )
{
	$start = floor(($forum_topic_data['prev_posts'] - 1) / intval($board_config['posts_per_page'])) * intval($board_config['posts_per_page']);
}

//
// Is user watching this thread?
//
if( $userdata['session_logged_in'] )
{
	$can_watch_topic = TRUE;

	$sql = "SELECT notify_status
		FROM " . TOPICS_WATCH_TABLE . "
		WHERE topic_id = $topic_id
			AND user_id = " . $userdata['user_id'];
	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, "Could not obtain topic watch information", '', __LINE__, __FILE__, $sql);
	}

	if ( $row = $db->sql_fetchrow($result) )
	{
		if ( isset($HTTP_GET_VARS['unwatch']) )
		{
			if ( $HTTP_GET_VARS['unwatch'] == 'topic' )
			{
				$is_watching_topic = 0;

				$sql_priority = (SQL_LAYER == "mysql") ? "LOW_PRIORITY" : '';
				$sql = "DELETE $sql_priority FROM " . TOPICS_WATCH_TABLE . "
					WHERE topic_id = $topic_id
						AND user_id = " . $userdata['user_id'];
				if ( !($result = $db->sql_query($sql)) )
				{
					message_die(GENERAL_ERROR, "Could not delete topic watch information", '', __LINE__, __FILE__, $sql);
				}
			}

			$template->assign_vars(array(
				'META' => '<meta http-equiv="refresh" content="3;url=' . append_sid("viewtopic.$phpEx?" . POST_TOPIC_URL . "=$topic_id&amp;start=$start") . '">')
			);

			$message = $lang['No_longer_watching'] . '<br /><br />' . sprintf($lang['Click_return_topic'], '<a href="' . append_sid("viewtopic.$phpEx?" . POST_TOPIC_URL . "=$topic_id&amp;start=$start") . '">', '</a>');
			message_die(GENERAL_MESSAGE, $message);
		}
		else
		{
			$is_watching_topic = TRUE;

			if ( $row['notify_status'] )
			{
				$sql_priority = (SQL_LAYER == "mysql") ? "LOW_PRIORITY" : '';
				$sql = "UPDATE $sql_priority " . TOPICS_WATCH_TABLE . "
					SET notify_status = 0
					WHERE topic_id = $topic_id
						AND user_id = " . $userdata['user_id'];
				if ( !($result = $db->sql_query($sql)) )
				{
					message_die(GENERAL_ERROR, "Could not update topic watch information", '', __LINE__, __FILE__, $sql);
				}
			}
		}
	}
	else
	{
		if ( isset($HTTP_GET_VARS['watch']) )
		{
			if ( $HTTP_GET_VARS['watch'] == 'topic' )
			{
				$is_watching_topic = TRUE;

				$sql_priority = (SQL_LAYER == "mysql") ? "LOW_PRIORITY" : '';
				$sql = "INSERT $sql_priority INTO " . TOPICS_WATCH_TABLE . " (user_id, topic_id, notify_status)
					VALUES (" . $userdata['user_id'] . ", $topic_id, 0)";
				if ( !($result = $db->sql_query($sql)) )
				{
					message_die(GENERAL_ERROR, "Could not insert topic watch information", '', __LINE__, __FILE__, $sql);
				}
			}

			$template->assign_vars(array(
				'META' => '<meta http-equiv="refresh" content="3;url=' . append_sid("viewtopic.$phpEx?" . POST_TOPIC_URL . "=$topic_id&amp;start=$start") . '">')
			);

			$message = $lang['You_are_watching'] . '<br /><br />' . sprintf($lang['Click_return_topic'], '<a href="' . append_sid("viewtopic.$phpEx?" . POST_TOPIC_URL . "=$topic_id&amp;start=$start") . '">', '</a>');
			message_die(GENERAL_MESSAGE, $message);
		}
		else
		{
			$is_watching_topic = 0;
		}
	}
}
else
{
	if ( isset($HTTP_GET_VARS['unwatch']) )
	{
		if ( $HTTP_GET_VARS['unwatch'] == 'topic' )
		{
			redirect(append_sid("login.$phpEx?redirect=viewtopic.$phpEx&" . POST_TOPIC_URL . "=$topic_id&unwatch=topic", true));
		}
	}
	else
	{
		$can_watch_topic = 0;
		$is_watching_topic = 0;
	}
}

//
// Generate a 'Show posts in previous x days' select box. If the postdays var is POSTed
// then get it's value, find the number of topics with dates newer than it (to properly
// handle pagination) and alter the main query
//
$previous_days = array(0, 1, 7, 14, 30, 90, 180, 364);
$previous_days_text = array($lang['All_Posts'], $lang['1_Day'], $lang['7_Days'], $lang['2_Weeks'], $lang['1_Month'], $lang['3_Months'], $lang['6_Months'], $lang['1_Year']);

if( !empty($HTTP_POST_VARS['postdays']) || !empty($HTTP_GET_VARS['postdays']) )
{
	$post_days = ( !empty($HTTP_POST_VARS['postdays']) ) ? $HTTP_POST_VARS['postdays'] : $HTTP_GET_VARS['postdays'];
	$min_post_time = time() - (intval($post_days) * 86400);

	$sql = "SELECT COUNT(p.post_id) AS num_posts
		FROM " . TOPICS_TABLE . " t, " . POSTS_TABLE . " p
		WHERE t.topic_id = $topic_id
			AND p.topic_id = t.topic_id
			AND p.post_time >= $min_post_time";
	if ( !($result = $db->sql_query($sql)) )
	{
		message_die(GENERAL_ERROR, "Could not obtain limited topics count information", '', __LINE__, __FILE__, $sql);
	}

	$total_replies = ( $row = $db->sql_fetchrow($result) ) ? intval($row['num_posts']) : 0;

	$limit_posts_time = "AND p.post_time >= $min_post_time ";

	if ( !empty($HTTP_POST_VARS['postdays']))
	{
		$start = 0;
1234

viewtopic.php - 源码说明

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