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<?php
# ***** BEGIN LICENSE BLOCK *****
# This is Antispam, a plugin for DotClear. 
# Copyright (c) 2007 Alain Vagner and contributors. All rights
# reserved.
#
# DotClear 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.
# 
# DotClear 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 DotClear; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# ***** END LICENSE BLOCK *****

class dcAntispam
{
	public static $filters;
	
	public static function initFilters()
	{
		global $core;
		
		if (!isset($core->spamfilters)) {
			return;
		}
		
		self::$filters = new dcSpamFilters($core);
		self::$filters->init($core->spamfilters);
	}
	
	public static function isSpam(&$cur)
	{
		self::initFilters();
		self::$filters->isSpam($cur);
	}
	
	public static function trainFilters(&$blog,&$cur,&$rs)
	{
		$status = null;
		# From ham to spam
		if ($rs->comment_status != -2 && $cur->comment_status == -2) {
			$status = 'spam';
		}
		
		# From spam to ham
		if ($rs->comment_status == -2 && $cur->comment_status == 1) {
			$status = 'ham';
		}
		
		# the status of this comment has changed
		if ($status)
		{
			$filter_name = $rs->exists('comment_spam_filter') ? $rs->comment_spam_filter : null;
			
			self::initFilters();
			self::$filters->trainFilters($rs,$status,$filter_name);
		}
	}
	
	public static function statusMessage(&$rs)
	{
		if ($rs->exists('comment_status') && $rs->comment_status == -2)
		{
			$filter_name = $rs->exists('comment_spam_filter') ? $rs->comment_spam_filter : null;
			
			self::initFilters();
			
			return
			'<p><strong>'.__('This comment is a spam:').'</strong> '.
			self::$filters->statusMessage($rs,$filter_name).'</p>';
		}
	}
	
	public static function countSpam(&$core)
	{
		return $core->blog->getComments(array('comment_status'=>-2),true)->f(0);
	}
	
	public static function countPublishedComments(&$core)
	{
		return $core->blog->getComments(array('comment_status'=>1),true)->f(0);
	}
	
	public static function delAllSpam(&$core)
	{
		$strReq =
		'SELECT comment_id '.
		'FROM '.$core->prefix.'comment C '.
		'JOIN '.$core->prefix.'post P ON P.post_id = C.post_id '.
		"WHERE blog_id = '".$core->con->escape($core->blog->id)."' ".
		'AND comment_status = -2 ';
		
		$rs = $core->con->select($strReq);
		$r = array();
		while ($rs->fetch()) {
			$r[] = (integer) $rs->comment_id;
		}
		
		if (empty($r)) {
			return;
		}
		
		$strReq =
		'DELETE FROM '.$core->prefix.'comment '.
		'WHERE comment_id '.$core->con->in($r).' ';
		
		$core->con->execute($strReq);
	}
	
	public static function getUserCode($core)
	{
		$code =
		pack('a32',$core->auth->userID()).
		pack('H*',crypt::hmac(DC_MASTER_KEY,$core->auth->getInfo('user_pwd')));
		return bin2hex($code);
	}
	
	public static function checkUserCode($core,$code)
	{
		$code = pack('H*',$code);
		
		$user_id = trim(@pack('a32',substr($code,0,32)));
		$pwd = @unpack('H40hex',substr($code,32,40));
		
		if ($user_id === false || $pwd === false) {
			return false;
		}
		
		$pwd = $pwd['hex'];
		
		$strReq = 'SELECT user_id, user_pwd '.
				'FROM '.$core->prefix.'user '.
				"WHERE user_id = '".$core->con->escape($user_id)."' ";
		
		$rs = $core->con->select($strReq);
		
		if ($rs->isEmpty()) {
			return false;
		}
		
		if (crypt::hmac(DC_MASTER_KEY,$rs->user_pwd) != $pwd) {
			return false;
		}
		
		return $rs->user_id;
	}
}
?>