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<?php
// +-----------------------------------------------------------------------+
// | PhpWebGallery - a PHP based picture gallery |
// | Copyright (C) 2002-2003 Pierrick LE GALL - pierrick@phpwebgallery.net |
// | Copyright (C) 2003-2007 PhpWebGallery Team - http://phpwebgallery.net |
// +-----------------------------------------------------------------------+
// | file : $Id$
// | last update : $Date$
// | last modifier : $Author$
// | revision : $Revision$
// +-----------------------------------------------------------------------+
// | 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 |
// | |
// | This program is distributed in the hope that it will be useful, but |
// | WITHOUT ANY WARRANTY; without even the implied warranty of |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
// | General Public License for more details. |
// | |
// | You should have received a copy of the GNU General Public License |
// | along with this program; if not, write to the Free Software |
// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
// | USA. |
// +-----------------------------------------------------------------------+
/**
* returns a "secret key" that is to be sent back when a user enters a comment
*/
function get_comment_post_key($image_id)
{
global $conf;
$time = time();
return sprintf(
'%s:%s',
$time,
hash_hmac(
'md5',
$time.':'.$image_id,
$conf['secret_key']
)
);
}
//returns string action to perform on a new comment: validate, moderate, reject
function user_comment_check($action, $comment)
{
global $conf,$user;
if ($action=='reject')
return $action;
$my_action = $conf['comment_spam_reject'] ? 'reject':'moderate';
if ($action==$my_action)
return $action;
// we do here only BASIC spam check (plugins can do more)
if ( !$user['is_the_guest'] )
return $action;
$link_count = preg_match_all( '/https?:\/\//',
$comment['content'], $matches);
if ( strpos($comment['author'], 'http://')!==false )
{
$link_count++;
}
if ( $link_count>$conf['comment_spam_max_links'] )
return $my_action;
if ( isset($comment['ip']) and $conf['comment_spam_check_ip']
and $_SERVER["SERVER_ADDR"] != $comment['ip']
)
{
$rev_ip = implode( '.', array_reverse( explode('.',$comment['ip']) ) );
$lookup = $rev_ip . '.sbl-xbl.spamhaus.org.';
$res = gethostbyname( $lookup );
if ( $lookup != $res )
return $my_action;
}
return $action;
}
add_event_handler('user_comment_check', 'user_comment_check',
EVENT_HANDLER_PRIORITY_NEUTRAL, 2);
/**
* Tries to insert a user comment in the database and returns one of :
* validate, moderate, reject
* @param array comm contains author, content, image_id
* @param string key secret key sent back to the browser
* @param array infos out array of messages
*/
function insert_user_comment( &$comm, $key, &$infos )
{
global $conf, $user;
$comm = array_merge( $comm,
array(
'ip' => $_SERVER['REMOTE_ADDR'],
'agent' => $_SERVER['HTTP_USER_AGENT']
)
);
$infos = array();
if (!$conf['comments_validation'] or is_admin())
{
$comment_action='validate'; //one of validate, moderate, reject
}
else
{
$comment_action='moderate'; //one of validate, moderate, reject
}
if ( $user['is_the_guest'] )
{
if ( empty($comm['author']) )
{
$comm['author'] = 'guest';
}
// if a guest try to use the name of an already existing user, he must be
// rejected
if ( $comm['author'] != 'guest' )
{
$query = '
SELECT COUNT(*) AS user_exists
FROM '.USERS_TABLE.'
WHERE '.$conf['user_fields']['username']." = '".addslashes($comm['author'])."'";
$row = mysql_fetch_assoc( pwg_query( $query ) );
if ( $row['user_exists'] == 1 )
{
array_push($infos, l10n('comment_user_exists') );
$comment_action='reject';
}
}
}
else
{
$comm['author'] = $user['username'];
}
if ( empty($comm['content']) )
{ // empty comment content
$comment_action='reject';
}
$key = explode( ':', @$key );
if ( count($key)!=2
or $key[0]>time()-2 // page must have been retrieved more than 2 sec ago
or $key[0]<time()-3600 // 60 minutes expiration
or hash_hmac(
'md5', $key[0].':'.$comm['image_id'], $conf['secret_key']
) != $key[1]
)
{
$comment_action='reject';
}
if ($comment_action!='reject' and $conf['anti-flood_time']>0 )
{ // anti-flood system
$reference_date = time() - $conf['anti-flood_time'];
$query = '
SELECT id FROM '.COMMENTS_TABLE.'
WHERE date > FROM_UNIXTIME('.$reference_date.')
AND author = "'.addslashes($comm['author']).'"';
if ( mysql_num_rows( pwg_query( $query ) ) > 0 )
{
array_push( $infos, l10n('comment_anti-flood') );
$comment_action='reject';
}
}
// perform more spam check
$comment_action = trigger_event('user_comment_check',
$comment_action, $comm
);
if ( $comment_action!='reject' )
{
$query = '
INSERT INTO '.COMMENTS_TABLE.'
(author, content, date, validated, validation_date, image_id)
VALUES (
"'.addslashes($comm['author']).'",
"'.addslashes($comm['content']).'",
NOW(),
"'.($comment_action=='validate' ? 'true':'false').'",
'.($comment_action=='validate' ? 'NOW()':'NULL').',
'.$comm['image_id'].'
)
';
pwg_query($query);
$comm['id'] = mysql_insert_id();
if ( ($comment_action=='validate' and $conf['email_admin_on_comment'])
or $conf['email_admin_on_comment_validation'] )
{
include_once(PHPWG_ROOT_PATH.'include/functions_mail.inc.php');
$del_url =
get_absolute_root_url().'comments.php?delete='.$comm['id'];
$keyargs_content = array
(
get_l10n_args('Author: %s', $comm['author']),
get_l10n_args('Comment: %s', $comm['content']),
get_l10n_args('', ''),
get_l10n_args('Delete: %s', $del_url)
);
if ($comment_action!='validate')
{
$keyargs_content[] =
get_l10n_args('', '');
$keyargs_content[] =
get_l10n_args('Validate: %s',
get_absolute_root_url().'comments.php?validate='.$comm['id']);
}
pwg_mail_notification_admins
(
get_l10n_args('Comment by %s', $comm['author']),
$keyargs_content
);
}
}
return $comment_action;
}
?>
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