##################################################################################
##
## MOD Title:   derefer.me MOD
## MOD Author:  N/A < info[at]derefer.me > (Martin Janecke) http://derefer.me/
## MOD Description:
##   This MOD derefers all user posted external hyperlinks.
## MOD Version: 1.2.1
##
## Installation Level: Easy
## Installation Time:  12 Minutes
## Files To Edit:
##   groupcp.php
##   includes/bbcode.php
##   includes/functions.php
##   includes/usercp_viewprofile.php
##   memberlist.php
##   privmsg.php
##   viewtopic.php
## Included Files: N/A
##
##################################################################################
## Author Notes:
##
##  This MOD derefers all user posted external hyperlinks with or without
##  url-tags, including the user's website from the user profile. It doesn't
##  derefer links to messengers such as ICQ.
##  Neither does it derefer external images using the img-tag. Derefering
##  img-tags requires another technology, such as an image proxy.
##
##  This MOD is tested for phpbb-2.0.23. Please update your forum software
##  to this phpbb-2 version prior to installing this mod.
##
##  Please download the newest version of this mod from:
##  http://derefer.me/download/derefer-me-mod-phpbb-2.txt
##
##################################################################################
## MOD History:
##
##   2008-07-24 - Version 1.0.0
##	- Initial Release
##
##   2008-11-23 - Version 1.1.0
##	- Use a function for dereferring.
##
##   2009-04-25 - Version 1.2.0
##	- Only derefer external links.
##
##   2010-03-16 - Version 1.2.1
##	- Fixed an error with URLs including the ampersand.
##
##################################################################################
##
## Before adding this MOD to your forum, you should back up all files
## related to this MOD.
##
##################################################################################
#
#-----[ OPEN ]-----
#
groupcp.php
#
#-----[ FIND ]-----
#
	$www_img = ( $row['user_website'] ) ? '<a href="' . $row['user_website'] . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '';
	$www = ( $row['user_website'] ) ? '<a href="' . $row['user_website'] . '" target="_userwww">' . $lang['Visit_website'] . '</a>' : '';
#
#-----[ REPLACE WITH ]-----
#
	$www_img = ( $row['user_website'] ) ? '<a href="' . derefer ($row['user_website']) . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '';
	$www = ( $row['user_website'] ) ? '<a href="' . derefer ($row['user_website']) . '" target="_userwww">' . $lang['Visit_website'] . '</a>' : '';
#
#-----[ OPEN ]-----
#
includes/bbcode.php
#
#-----[ FIND ]-----
#
	// We do URLs in several different ways..
	$bbcode_tpl['url1'] = str_replace('{URL}', '\\1', $bbcode_tpl['url']);
	$bbcode_tpl['url1'] = str_replace('{DESCRIPTION}', '\\1', $bbcode_tpl['url1']);

	$bbcode_tpl['url2'] = str_replace('{URL}', 'http://\\1', $bbcode_tpl['url']);
	$bbcode_tpl['url2'] = str_replace('{DESCRIPTION}', '\\1', $bbcode_tpl['url2']);

	$bbcode_tpl['url3'] = str_replace('{URL}', '\\1', $bbcode_tpl['url']);
	$bbcode_tpl['url3'] = str_replace('{DESCRIPTION}', '\\2', $bbcode_tpl['url3']);

	$bbcode_tpl['url4'] = str_replace('{URL}', 'http://\\1', $bbcode_tpl['url']);
	$bbcode_tpl['url4'] = str_replace('{DESCRIPTION}', '\\3', $bbcode_tpl['url4']);
#
#-----[ REPLACE WITH ]-----
#
	// We do URLs in several different ways...
	$bbcode_tpl['url1'] =
	'
		global $bbcode_tpl;
		$url1 = str_replace("{URL}", derefer ($match[1]), $bbcode_tpl["url"]);
		return str_replace("{DESCRIPTION}", $match[1], $url1);
	';
	$bbcode_tpl['url2'] =
	'
		global $bbcode_tpl;
		$url2 = str_replace("{URL}", derefer ("http://{$match[1]}"), $bbcode_tpl["url"]);
		return str_replace("{DESCRIPTION}", $match[1], $url2);
	';
	$bbcode_tpl['url3'] =
	'
		global $bbcode_tpl;
		$url3 = str_replace("{URL}", derefer ($match[1]), $bbcode_tpl["url"]);
		return str_replace("{DESCRIPTION}", $match[2], $url3);
	';
	$bbcode_tpl['url4'] =
	'
		global $bbcode_tpl;
		$url4 = str_replace("{URL}", derefer ("http://{$match[1]}"), $bbcode_tpl["url"]);
		return str_replace("{DESCRIPTION}", $match[3], $url4);
	';
#
#-----[ FIND ]-----
#
	// Patterns and replacements for URL and email tags..
	$patterns = array();
	$replacements = array();
#
#-----[ AFTER, ADD ]-----
#
	$callback_patterns = array();
	$callback_replacements = array();
#
#-----[ FIND ]-----
#
	// matches a [url]xxxx://www.phpbb.com[/url] code..
	$patterns[] = "#\[url\]([\w]+?://([\w\#$%&~/.\-;:=,?@\]+]+|\[(?!url=))*?)\[/url\]#is";
	$replacements[] = $bbcode_tpl['url1'];

	// [url]www.phpbb.com[/url] code.. (no xxxx:// prefix).
	$patterns[] = "#\[url\]((www|ftp)\.([\w\#$%&~/.\-;:=,?@\]+]+|\[(?!url=))*?)\[/url\]#is";
	$replacements[] = $bbcode_tpl['url2'];

	// [url=xxxx://www.phpbb.com]phpBB[/url] code..
	$patterns[] = "#\[url=([\w]+?://[\w\#$%&~/.\-;:=,?@\[\]+]*?)\]([^?\n\r\t].*?)\[/url\]#is";
	$replacements[] = $bbcode_tpl['url3'];

	// [url=www.phpbb.com]phpBB[/url] code.. (no xxxx:// prefix).
	$patterns[] = "#\[url=((www|ftp)\.[\w\#$%&~/.\-;:=,?@\[\]+]*?)\]([^?\n\r\t].*?)\[/url\]#is";
	$replacements[] = $bbcode_tpl['url4'];
#
#-----[ REPLACE WITH ]-----
#
	// matches a [url]xxxx://www.phpbb.com[/url] code..
	$callback_patterns[] = "#\[url\]([\w]+?://([\w\#$%&~/.\-;:=,?@\]+]+|\[(?!url=))*?)\[/url\]#is";
	$callback_replacements[] = $bbcode_tpl['url1'];

	// [url]www.phpbb.com[/url] code.. (no xxxx:// prefix).
	$callback_patterns[] = "#\[url\]((www|ftp)\.([\w\#$%&~/.\-;:=,?@\]+]+|\[(?!url=))*?)\[/url\]#is";
	$callback_replacements[] = $bbcode_tpl['url2'];

	// [url=xxxx://www.phpbb.com]phpBB[/url] code..
	$callback_patterns[] = "#\[url=([\w]+?://[\w\#$%&~/.\-;:=,?@\[\]+]*?)\]([^?\n\r\t].*?)\[/url\]#is";
	$callback_replacements[] = $bbcode_tpl['url3'];

	// [url=www.phpbb.com]phpBB[/url] code.. (no xxxx:// prefix).
	$callback_patterns[] = "#\[url=((www|ftp)\.[\w\#$%&~/.\-;:=,?@\[\]+]*?)\]([^?\n\r\t].*?)\[/url\]#is";
	$callback_replacements[] = $bbcode_tpl['url4'];
#
#-----[ FIND ]-----
#
	$text = preg_replace($patterns, $replacements, $text);
#
#-----[ AFTER, ADD ]-----
#
	foreach ($callback_patterns as $key => $pattern)
	{
		$text = preg_replace_callback($pattern, create_function ('$match', $callback_replacements[$key]), $text);
	}
#
#-----[ FIND ]-----
#
	$ret = preg_replace("#(^|[\n ])([\w]+?://[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "\\1<a href=\"\\2\" target=\"_blank\">\\2</a>", $ret);
#
#-----[ REPLACE WITH ]-----
#
	$ret = preg_replace_callback
	(
		"#(^|[\n ])([\w]+?://[\w\#$%&~/.\-;:=,?@\[\]+]*)#is",
		create_function
		(
			'$match',
			'return "{$match[1]}<a href=\""
			. derefer ($match[2])
			. "\" target=\"_blank\">{$match[2]}</a>";'
		),
		$ret
	);
#
#-----[ FIND ]-----
#
	$ret = preg_replace("#(^|[\n ])((www|ftp)\.[\w\#$%&~/.\-;:=,?@\[\]+]*)#is", "\\1<a href=\"http://\\2\" target=\"_blank\">\\2</a>", $ret);
#
#-----[ REPLACE WITH ]-----
#
	$ret = preg_replace_callback
	(
		"#(^|[\n ])((www|ftp)\.[\w\#$%&~/.\-;:=,?@\[\]+]*)#is",
		create_function
		(
			'$match',
			'return "{$match[1]}<a href=\""
			. derefer ("http://{$match[2]}")
			. "\" target=\"_blank\">{$match[2]}</a>";'
		),
		$ret
	);
#
#-----[ OPEN ]-----
#
includes/functions.php
#
#-----[ FIND ]-----
#
function get_db_stat($mode)
#
#-----[ BEFORE, ADD ]-----
#
// dereferring function
function derefer ($url)
{
	global $board_config;

	// return the unaltered URL for local links	
	if (($components = @parse_url ($url)) && isset ($components['host']) && isset ($board_config['server_name']))
	{
		if (strtolower ($components['host']) == strtolower ($board_config['server_name']))
		{
			return $url;
		}
	}
	
	// return the dereferred URL for external links
	return 'http://derefer.me/?' . urlencode (str_replace ('&amp;', '&', $url));
}

#
#-----[ OPEN ]-----
#
includes/usercp_viewprofile.php
#
#-----[ FIND ]-----
#
$www_img = ( $profiledata['user_website'] ) ? '<a href="' . $profiledata['user_website'] . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '&nbsp;';
$www = ( $profiledata['user_website'] ) ? '<a href="' . $profiledata['user_website'] . '" target="_userwww">' . $profiledata['user_website'] . '</a>' : '&nbsp;';
#
#-----[ REPLACE WITH ]-----
#
$www_img = ( $profiledata['user_website'] ) ? '<a href="' . derefer ($profiledata['user_website']) . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '&nbsp;';
$www = ( $profiledata['user_website'] ) ? '<a href="' . derefer ($profiledata['user_website']) . '" target="_userwww">' . $profiledata['user_website'] . '</a>' : '&nbsp;';
#
#-----[ OPEN ]-----
#
memberlist.php
#
#-----[ FIND ]-----
#
		$www_img = ( $row['user_website'] ) ? '<a href="' . $row['user_website'] . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '';
		$www = ( $row['user_website'] ) ? '<a href="' . $row['user_website'] . '" target="_userwww">' . $lang['Visit_website'] . '</a>' : '';
#
#-----[ REPLACE WITH ]-----
#
		$www_img = ( $row['user_website'] ) ? '<a href="' . derefer ($row['user_website']) . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '';
		$www = ( $row['user_website'] ) ? '<a href="' . derefer ($row['user_website']) . '" target="_userwww">' . $lang['Visit_website'] . '</a>' : '';
#
#-----[ OPEN ]-----
#
privmsg.php
#
#-----[ FIND ]-----
#
	$www_img = ( $privmsg['user_website'] ) ? '<a href="' . $privmsg['user_website'] . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '';
	$www = ( $privmsg['user_website'] ) ? '<a href="' . $privmsg['user_website'] . '" target="_userwww">' . $lang['Visit_website'] . '</a>' : '';
#
#-----[ REPLACE WITH ]-----
#
	$www_img = ( $privmsg['user_website'] ) ? '<a href="' . derefer ($privmsg['user_website']) . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '';
	$www = ( $privmsg['user_website'] ) ? '<a href="' . derefer ($privmsg['user_website']) . '" target="_userwww">' . $lang['Visit_website'] . '</a>' : '';
#
#-----[ OPEN ]-----
#
viewtopic.php
#
#-----[ FIND ]-----
#
		$www_img = ( $postrow[$i]['user_website'] ) ? '<a href="' . $postrow[$i]['user_website'] . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '';
		$www = ( $postrow[$i]['user_website'] ) ? '<a href="' . $postrow[$i]['user_website'] . '" target="_userwww">' . $lang['Visit_website'] . '</a>' : '';
#
#-----[ REPLACE WITH ]-----
#
		$www_img = ( $postrow[$i]['user_website'] ) ? '<a href="' . derefer ($postrow[$i]['user_website']) . '" target="_userwww"><img src="' . $images['icon_www'] . '" alt="' . $lang['Visit_website'] . '" title="' . $lang['Visit_website'] . '" border="0" /></a>' : '';
		$www = ( $postrow[$i]['user_website'] ) ? '<a href="' . derefer ($postrow[$i]['user_website']) . '" target="_userwww">' . $lang['Visit_website'] . '</a>' : '';
#
#-----[ SAVE/CLOSE ALL FILES ]-----
#
# EoM