lifetype/branches/lifetype-1.0.6/trackback.php

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<?php

    if (!defined( "PLOG_CLASS_PATH" )) {
        define( "PLOG_CLASS_PATH", dirname(__FILE__)."/");
    }

    include_once( PLOG_CLASS_PATH."class/dao/trackbacks.class.php" );
    include_once( PLOG_CLASS_PATH."class/config/properties.class.php" );
    include_once( PLOG_CLASS_PATH."class/config/config.class.php" );
    include_once( PLOG_CLASS_PATH."class/data/textfilter.class.php" );
    include_once( PLOG_CLASS_PATH."class/net/http/httpvars.class.php" );
        include_once( PLOG_CLASS_PATH."class/dao/articlenotifications.class.php" );
        include_once( PLOG_CLASS_PATH."class/dao/articles.class.php" );
        include_once( PLOG_CLASS_PATH."class/dao/blogs.class.php" );
        include_once( PLOG_CLASS_PATH."class/template/cachecontrol.class.php" );
    include_once( PLOG_CLASS_PATH."class/plugin/pluginmanager.class.php" );     

    //
    // set this to 'true' if you want this script to log whatever it is
    // doing... (useful for debugging)
    //
    define( "TRACKBACK_DEBUG_ENABLED", true );

    function errorResponse( $message )
    {
        $result = '<?xml version="1.0" encoding="iso-8859-1"?>';
        $result .= '<response>';
        $result .= '<error>1</error>';
        $result .= '<message>'.$message.'</message>';
        $result .= '</response>';

        return $result;
    }
        
        function dumpRequest( $request ) 
        {

                trackbackLog( "-- dump of trackback request --" );
                $params = $request->getAsArray();
                foreach( $params as $key => $value )
                {
                        trackbackLog( "  $key = $value" );
                }
                trackbackLog( "-- end of dump --" );
                
                return true;
        }
        
        function trackbackLog( $message )
        {
                if( TRACKBACK_DEBUG_ENABLED ) {
                        $logger =& LoggerManager::getLogger( "trackback" );
                        $logger->debug( $message );
                }
                
                return true;
        }
        
    // prepare everything...
    $config =& Config::getConfig();
    // get the post and get parameters
    trackbackLog( "** Request received" );
    $params = new Properties( HttpVars::getRequest());
    dumpRequest( $params );

    // check that they are correct and quit if they're not
    if( $params->getValue("id") == "" || $params->getValue("id") <= 0 ) {
        $result = errorResponse( "Incorrect or missing id parameter." );
        print($result);
        trackbackLog( "Sending error response: $result" );
        trackbackLog( "** End" );
        die;
    }

    if( $params->getValue( "url" ) == "" ) {
        $result = errorResponse( "The url parameter must be present." );
        print($result);
        trackbackLog( "Sending error response: $result" );
        trackbackLog( "** End" );
        die;
    }

    if( !$config->getValue( "trackback_server_enabled" )) {
                trackbackLog( "Trackback server disabled by administrator" );
        $result = errorResponse( "Trackback feature has been disabled by the administrator." );
                die( $result ); 
        }

        // for security, we will strip _ANY_ html tag from the tags
        $tf = new TextFilter();
        $blogName  = $tf->filterAllHTML( $params->getValue( "blog_name" ));
        $excerpt   = $tf->filterAllHTML( $params->getValue( "excerpt" ));
        $title     = $tf->filterAllHTML( $params->getValue( "title" ));
        $articleId = $params->getValue( "id" );
        $url       = $tf->filterAllHTML( $params->getValue( "url" ));
                
        // try to see if the article is correct
        $articles = new Articles();
        $article = $articles->getBlogArticle( $articleId );
        if( !$article ) {
                trackbackLog( "ERROR: Incorrect error identifier" );
                $result = errorResponse( "Incorrect article identifier" );
                die( $result );
        }
        
        // try to load the blog info too, as we are going to need it
        $blogs = new Blogs();
        $blogInfo = $blogs->getBlogInfo( $article->getBlog());
        
        // a bit of protection...
        if( !$blogInfo ) {
                trackbackLog( "ERROR: Article id ".$article->getId()." points to blog ".$article->getBlog()." that doesn't exist!" );
                $result = errorResponse( "The blog does not exist" );
                die( $result );
        }
        
        // if the blog is disabled, then we shoulnd't take trackbacks...
        if( $blogInfo->getStatus() != BLOG_STATUS_ACTIVE ) {
                trackbackLog( "ERROR: The blog ".$blogInfo->getBlog()." is set as disabled and cannot receive trackbacks!" );
                $result = errorResponse( "The blog is not active" );
                die( $result );
        }
        
        // if everything went fine, load the plugins so that we can throw some events...
    $pm =& PluginManager::getPluginManager();
    $pm->loadPlugins();
        // and also configure the BlogInfo and UserInfo objects so that they know
        // who threw the events...
    $pm->setBlogInfo( $blogInfo );
        $userInfo = $blogInfo->getOwnerInfo();
    $pm->setUserInfo( $userInfo );
        
        // receives the request and adds it to the database
        $trackbacks = new TrackBacks();
        // create teh trackback object
        $now = new Timestamp();
        $trackback = new Trackback( $url, $title, $articleId, $excerpt, $blogName, $now->getTimestamp());
        // throw the event in case somebody is listening to it!
        $pm->notifyEvent( EVENT_PRE_TRACKBACK_ADD, Array( "trackback" => &$trackback ));
        $result = $trackbacks->addTrackBack( $trackback );
        if( !$result ) {
                trackbackLog( "There was an error saving the trackback!" );
        }
        // throw the post event too...
        $pm->notifyEvent( EVENT_POST_TRACKBACK_ADD, Array( "trackback" => &$trackback ));


        // notify the user that a new trackback has been received, if the article was
        // configured to receive notifications
        // but first make sure, the trackback was not removed by some plugins like validatetrackback...
    if( $trackbacks->getArticleTrackback( $trackback->getId() ) ) {
        $notifier = new ArticleNotifications();
        $notifier->notifyUsers( $article->getId(), $blogInfo);

        // result
        $result = '<?xml version="1.0" encoding="iso-8859-1"?>';
        $result .= '<response>';
        $result .= '<error>0</error>';
        $result .= '</response>';
    } else {
        // result 
        $result = errorResponse( "Forbidden trackback" );
    }
        
        // clear the blog cache
        CacheControl::resetBlogCache( $article->getBlog());

    // return the result
    print($result);

    trackbackLog( "Sending response: $result" );
    trackbackLog( "** End" );
        
        die();
?>

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