mprins / dokuwiki-plugin-dokusioc

action.php

<?php
/**
 * DokuSIOC - SIOC plugin for DokuWiki
 *
 * version 0.1.2
 *
 * DokuSIOC integrates the SIOC ontology within DokuWiki and provides an
 * alternate RDF/XML views of the wiki documents.
 *
 * For DokuWiki we can't use the Triplify script because DokuWiki has not a RDBS
 * backend. But the wiki API provides enough methods to get the data out, so
 * DokuSIOC as a plugin uses the export hook to provide accessible data as
 * RDF/XML, using the SIOC ontology as vocabulary. 
 * 
 * METADATA
 *
 * @author    Michael Haschke @ eye48.com
 * @copyright 2009 Michael Haschke
 * @license   http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU General Public License 2.0 (GPLv2)
 * @version   0.1.2
 *
 * WEBSITES
 *
 * @link      http://eye48.com/go/dokusioc Plugin Website and Overview
 * @link      http://github.com/haschek/DokuWiki-Plugin-DokuSIOC/issues Issue tracker
 *
 * LICENCE
 * 
 * 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, version 2 of the License.
 *
 * 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.
 *
 * @link      http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU General Public License 2.0 (GPLv2)
 *
 * CHANGELOG
 *
 * 0.1.2
 * - fix: meta link to post type is standard use now (issue 9)
 * - mod: titles for SIOC documents (issue 10)
 * - mod: use sioc:UserAccount instead of deprecated sioc:User (issue 2)
 * 0.1.1 (bugfix release)
 * - fix header output for content negotiation
 * - fix URIs for profile and SIOC ressource
 * - better dc:title for revisions
 * - add complete URI to rdf:about for foaf:Document (Profile) to make it explicit
 * - add rel="canonical" for URIs with type parameter, to prevent double content
 * 0.1
 * - exchange licence b/c CC-BY-SA was incompatible with GPL
 * - restructuring code base
 * - fix: wrong meta link for revisions
 * - add: possibility to send noindex by x-robots-tag via HTTP header
 * - add: soft check for requested application type
 * - mod: use search method to get container content on next sub level
 * - mod: better dc:title for foaf:document,
 * - mod: better distinction between user/container/post resources
 * - mod: normalize URIs
 * - fix: URIs for SIOC documents
 * - mod: use dcterms:created and sioc:has_creator only for first revision of wiki page b/c of inadequate meta data
 * - add: backlinks from wiki via dcterms:isReferencedBy
 * - add: contributors by sioc:has_modifier (only for last revision b/c of wrong meta data for older revisions)
 * - rem: foaf:person link in sioct:WikiArticle b/c it routes to same data like sioc:has_creater/modifier
 * - rem: Talis SIOC widget for comments b/c incompatibility with DokuWiki JS
 * poc
 * - proof of concept release under CC-BY-SA
 **/
 
if (!defined('DOKU_INC')) die();
if (!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN', DOKU_INC.'lib/plugins/');

The constant DOKU_INC was not found. Maybe you did not declare it correctly or list all dependencies?

require_once(DOKU_PLUGIN.'action.php');
 
class action_plugin_dokusioc extends DokuWiki_Action_Plugin {

The type DokuWiki_Action_Plugin was not found. Maybe you did not declare it correctly or list all dependencies?

    var $agentlink = 'http://eye48.com/go/dokusioc?v=0.1.2';


    /* -- Methods to manage plugin ------------------------------------------ */

    /**
     * Register its handlers with the DokuWiki's event controller
     */
    public function register(Doku_Event_Handler $controller)

The type Doku_Event_Handler was not found. Maybe you did not declare it correctly or list all dependencies?

    {
        //print_r(headers_list()); die();
        
        // test the requested action
        $controller->register_hook('ACTION_ACT_PREPROCESS', 'BEFORE', $this, 'checkAction', $controller);
        // pingthesemanticweb.com
        if ($this->getConf('pingsw')) $controller->register_hook('ACTION_SHOW_REDIRECT', 'BEFORE', $this, 'pingService', $controller);
    }
 
    /* -- Event handlers ---------------------------------------------------- */

    public function checkAction($action, $controller)
    {
        global $INFO;
        //print_r($INFO); die();
        //print_r(headers_list()); die();

        if ($action->data == 'export_siocxml')
        {
            // give back rdf
            $this->exportSioc();
        }
        elseif (($action->data == 'show' || $action->data == 'index') && $INFO['perm'] && !defined('DOKU_MEDIADETAIL') && ($INFO['exists'] || getDwUserInfo($INFO['id'], $this)) && !isHiddenPage($INFO['id']))

The function isHiddenPage was not found. Maybe you did not declare it correctly or list all dependencies?

        {
            if ($this->isRdfXmlRequest())
            {
                // forward to rdfxml document if requested
                // print_r(headers_list()); die();
                $location = $this->createRdfLink();
                if (function_exists('header_remove')) header_remove();
                header('Location: '.$location['href'], true, 303); exit();
            }
            else
            {
                // add meta link to html head
                $controller->register_hook('TPL_METAHEADER_OUTPUT', 'BEFORE', $this, 'createRdfLink');
            }
        }
        /*
        else
        {
            print_r(array($action->data, $INFO['perm'], defined('DOKU_MEDIADETAIL'), $INFO['exists'], getDwUserInfo($INFO['id'],$this), isHiddenPage($INFO['id'])));
            die();
        }
        */
    }
    
    public function pingService($data, $controller)
    {
        // TODO: test acl
        // TODO: write in message queue (?)
        
        if ($data->data['preact'] == array('save'=>'Save') || $data->data['preact'] == 'save')
        {
            //die('http://pingthesemanticweb.com/rest/?url='.urlencode(getAbsUrl(wl($data->data['id']))));
            //$ping = fopen('http://pingthesemanticweb.com/rest/?url='.urlencode(getAbsUrl(wl($data->data['id']))),'r');
            // it must be a post, and it's the last revision
            $ping = @fopen('http://pingthesemanticweb.com/rest/?url='.urlencode(normalizeUri(getAbsUrl(exportlink($data->data['id'], 'siocxml', array('type'=>'post'), false, '&')))), 'r');

The function exportlink was not found. Maybe you did not declare it correctly or list all dependencies?

            @fclose($ping);

It seems like you do not handle an error condition for fclose(). This can introduce security issues, and is generally not recommended.

It seems like $ping can also be of type false; however, parameter $handle of fclose() does only seem to accept resource, maybe add an additional type check?

        }
    }
    
    /**
     */
    public function createRdfLink($event = null, $param = null)
    {
        global $ID, $INFO, $conf;
        
        // Test for hidden pages
        
        if (isHiddenPage($ID)) {

The function isHiddenPage was not found. Maybe you did not declare it correctly or list all dependencies?

                    return false;
        }
        
        // Get type of SIOC content
        
        $sioc_type = $this->_getContenttype();
        
        // Test for valid types
        
        if (!(($sioc_type == 'post' && $INFO['exists']) || $sioc_type == 'user' || $sioc_type == 'container')) {
                    return false;
        }
        
        // Test for permission
        
        if (!$INFO['perm']) {
          // not enough rights to see the wiki page
            return false;
        }

        $userinfo = getDwUserInfo($ID, $this);
        
        // Create attributes for meta link
        
        $metalink['type'] = 'application/rdf+xml';

$metalink was never initialized. Although not strictly required by PHP, it is generally a good practice to add $metalink = array(); before regardless.

        $metalink['rel'] = 'meta';
        
        switch ($sioc_type)
        {
            case 'container':
                $title = htmlentities("Container '".(isset($INFO['meta']['title']) ? $INFO['meta']['title'] : $ID)."' (SIOC document as RDF/XML)");
                $queryAttr = array('type'=>'container');
                break;
                
            case 'user':
                $title = htmlentities("User account '".$userinfo['name']."' (SIOC document as RDF/XML)");
                $queryAttr = array('type'=>'user');
                break;

            case 'post':
            default:
                $title = htmlentities("Article '".$INFO['meta']['title']."' (SIOC document as RDF/XML)");
                $queryAttr = array('type'=>'post');
                if (isset($_GET['rev']) && $_GET['rev'] == intval($_GET['rev']))
                    $queryAttr['rev'] = $_GET['rev'];
                break;
        }
    
        $metalink['title'] = $title;
        $metalink['href'] = normalizeUri(getAbsUrl(exportlink($ID, 'siocxml', $queryAttr, false, '&')));

The function exportlink was not found. Maybe you did not declare it correctly or list all dependencies?

        if ($event !== null)
        {
            $event->data['link'][] = $metalink;
            
            // set canocial link for type URIs to prevent indexing double content
            if ($_GET['type']) {
                            $event->data['link'][] = array('rel'=>'canonical', 'href'=>getAbsUrl(wl($ID)));

The function wl was not found. Maybe you did not declare it correctly or list all dependencies?

            }
        }
        
        return $metalink;
    }
    
    /* -- public class methods ---------------------------------------------- */

    public function exportSioc()
    {
        global $ID, $INFO, $conf, $REV, $auth;
        
        // Test for hidden pages
        
        if (isHiddenPage($ID)) {

The function isHiddenPage was not found. Maybe you did not declare it correctly or list all dependencies?

                    $this->_exit("HTTP/1.0 404 Not Found");
        }
        
        // Get type of SIOC content
        
        $sioc_type = $this->_getContenttype();
        
        // Test for valid types
        
        if (!(($sioc_type == 'post' && $INFO['exists']) || $sioc_type == 'user' || $sioc_type == 'container')) {
                    $this->_exit("HTTP/1.0 404 Not Found");
        }
        
        // Test for permission
        
        if (!$INFO['perm']) {
          // not enough rights to see the wiki page
            $this->_exit("HTTP/1.0 401 Unauthorized");
        }

        // Forward to URI with explicit type attribut
        if (!isset($_GET['type'])) {
          header('Location:'.$_SERVER['REQUEST_URI'].'&type='.$sioc_type, true, 302);
        }

        // Include SIOC libs
        
        require_once(dirname(__FILE__).DIRECTORY_SEPARATOR.'lib'.DIRECTORY_SEPARATOR.'sioc_inc.php');
        require_once(dirname(__FILE__).DIRECTORY_SEPARATOR.'lib'.DIRECTORY_SEPARATOR.'sioc_dokuwiki.php');
        
        // Create exporter
        
        $rdf = new SIOCExporter();
        $rdf->_profile_url = normalizeUri(getAbsUrl(exportlink($ID, 'siocxml', array('type'=>$sioc_type), false, '&')));

The function exportlink was not found. Maybe you did not declare it correctly or list all dependencies?

        $rdf->setURLParameters('type', 'id', 'page', false);
        
        // Create SIOC-RDF content
        
        switch ($sioc_type)
        {
            case 'container':
                $rdf = $this->_exportContainercontent($rdf);
                break;
                
            case 'user':
                $rdf = $this->_exportUsercontent($rdf);
                break;

            case 'post':
            default:
                $rdf = $this->_exportPostcontent($rdf);
                break;
        }
    
        // export
        if ($this->getConf('noindx')) {
                    header("X-Robots-Tag: noindex", true);
        }
        $rdf->export();
        
        //print_r(headers_list()); die();
        die();

Using exit here is not recommended.

    }
    
    public function isRdfXmlRequest()
    {   
        // get accepted types
        $http_accept = trim($_SERVER['HTTP_ACCEPT']);
        
        // save accepted types in array
        $accepted = explode(',', $http_accept);
        
        /*
        $debuginfo = implode(' // ', array(date('c',$_SERVER['REQUEST_TIME']), $_SERVER['HTTP_REFERER'], $_SERVER['REMOTE_ADDR'], $_SERVER['REMOTE_HOST'], $_SERVER['HTTP_USER_AGENT'], $_SERVER['HTTP_ACCEPT']));
        global $conf; //print_r($conf); die();
        //die($debuginfo);
        $debuglog = @fopen($conf['tmpdir'].DIRECTORY_SEPARATOR.'requests.log', 'ab');
        @fwrite($debuglog, $debuginfo."\n");
        @fclose($debuglog);
        @chmod($conf['tmpdir'].DIRECTORY_SEPARATOR.'requests.log', 0777);
        */
        
        // soft check, route to RDF when client requests it (don't check quality of request)
        
        if ($this->getConf('softck') && strpos($_SERVER['HTTP_ACCEPT'], 'application/rdf+xml') !== false)
        {
            return true;
        }
        
        if (count($accepted) > 0)
        {
            // hard check, only serve RDF if it is requested first or equal to first type
    
            // extract accepting ratio
            $test_accept = array();
            foreach ($accepted as $format)
            {
                $formatspec = explode(';', $format);
                $k = trim($formatspec[0]);
                if (count($formatspec) == 2)
                {
                    $test_accept[$k] = trim($formatspec[1]);
                } else
                {
                    $test_accept[$k] = 'q=1.0';
                }
            }
            
            // sort by ratio
            arsort($test_accept); $accepted_order = array_keys($test_accept);
            
            if ($accepted_order[0] == 'application/rdf+xml' || $test_accept['application/rdf+xml'] == 'q=1.0')
            {
                return true;
            }
        }

        // print_r($accepted_order);print_r($test_accept);die();

        return false;

    }

    /* -- private helpers --------------------------------------------------- */
    
    private function _getContenttype()
    {
        global $ID, $conf;

        // check for type if unknown
        if (!$_GET['type'])
        {
            $userinfo = getDwUserInfo($ID, $this);
            
            if ($userinfo)
            {
                $type = 'user';
            } elseif (isset($_GET['do']) && $_GET['do'] == 'index')
            {
                $type = 'container';
            } else
            {
                $type = 'post';
            }
            
        } else
        {
            $type = $_GET['type'];
        }
        
        return $type;
    
    }
    
    private function _exportPostcontent($exporter)
    {
        global $ID, $INFO, $REV, $conf;

        $exporter->setParameters('Article: '.$INFO['meta']['title'].($REV ? ' (rev '.$REV.')' : ''),
                            $this->_getDokuUrl(),
                            $this->_getDokuUrl().'doku.php?',
                            'utf-8',
                            $this->agentlink
                            );

        // create user object
        // $id, $uri, $name, $email, $homepage='', $foaf_uri='', $role=false, $nick='', $sioc_url='', $foaf_url=''
        $dwuserpage_id = cleanID($this->getConf('userns')).($conf['useslash'] ? '/' : ':').$INFO['editor'];

The function cleanID was not found. Maybe you did not declare it correctly or list all dependencies?

        /*
        if ($INFO['editor'] && $this->getConf('userns'))
            $pageuser = new SIOCUser($INFO['editor'],
                                        normalizeUri(getAbsUrl(exportlink($dwuserpage_id, 'siocxml', array('type'=>'user'), false, '&'))), // user page
                                        $INFO['meta']['contributor'][$INFO['editor']],
                                        getDwUserInfo($dwuserpage_id,$this,'mail'),
                                        '', // no homepage is saved for dokuwiki user
                                        '#'.$INFO['editor'], // local uri
                                        false, // no roles right now
                                        '', // no nick name is saved for dokuwiki user
                                        normalizeUri($exporter->siocURL('user', $dwuserpage_id))
                                    );
        */
        
        // create wiki page object
        $wikipage = new SIOCDokuWikiArticle($ID, // id
                                            normalizeUri($exporter->siocURL('post', $ID.($REV ? $exporter->_urlseparator.'rev'.$exporter->_urlequal.$REV : ''))), // url
                                            $INFO['meta']['title'].($REV ? ' (rev '.$REV.')' : ''), // subject
                                            rawWiki($ID, $REV) // body (content)

The function rawWiki was not found. Maybe you did not declare it correctly or list all dependencies?

                                            );
        /* encoded content   */ $wikipage->addContentEncoded(p_cached_output(wikiFN($ID, $REV), 'xhtml'));

The function p_cached_output was not found. Maybe you did not declare it correctly or list all dependencies?

The function wikiFN was not found. Maybe you did not declare it correctly or list all dependencies?

        /* created           */ if (isset($INFO['meta']['date']['created'])) $wikipage->addCreated(date('c', $INFO['meta']['date']['created']));
        /* or modified       */ if (isset($INFO['meta']['date']['modified'])) $wikipage->addModified(date('c', $INFO['meta']['date']['modified']));
        /* creator/modifier  */ if ($INFO['editor'] && $this->getConf('userns')) $wikipage->addCreator(array('foaf:maker'=>'#'.$INFO['editor'], 'sioc:modifier'=>$dwuserpage_id));
        /* is creator        */ if (isset($INFO['meta']['date']['created'])) $wikipage->isCreator();
        /* intern wiki links */ $wikipage->addLinks($INFO['meta']['relation']['references']);
        
        // contributors - only for last revision b/c of wrong meta data for older revisions
        if (!$REV && $this->getConf('userns') && isset($INFO['meta']['contributor']))
        {
            $cont_temp = array();
            $cont_ns = $this->getConf('userns').($conf['useslash'] ? '/' : ':');
            foreach ($INFO['meta']['contributor'] as $cont_id => $cont_name)
                $cont_temp[$cont_ns.$cont_id] = $cont_name;
            $wikipage->addContributors($cont_temp);
        }
        
        // backlinks - only for last revision
        if (!$REV)
        {
            require_once(DOKU_INC.'inc/fulltext.php');

The constant DOKU_INC was not found. Maybe you did not declare it correctly or list all dependencies?

            $backlinks = ft_backlinks($ID);

The function ft_backlinks was not found. Maybe you did not declare it correctly or list all dependencies?

            if (count($backlinks) > 0) {
              $wikipage->addBacklinks($backlinks);
            }
        }
        
        // TODO: addLinksExtern

        /* previous and next revision */
        $changelog = new PageChangeLog($ID);

The type PageChangeLog was not found. Maybe you did not declare it correctly or list all dependencies?

        $pagerevs = $changelog->getRevisions(0, $conf['recent'] + 1);
        $prevrev = false; $nextrev = false;
        if (!$REV)
        {
            // latest revision, previous rev is on top in array
            $prevrev = 0;
        } else
        {
            // other revision
            $currentrev = array_search($REV, $pagerevs);
            if ($currentrev !== false)
            {
                $prevrev = $currentrev + 1;
                $nextrev = $currentrev - 1;
            }
        }
        if ($prevrev !== false && $prevrev > -1 && page_exists($ID, $pagerevs[$prevrev]))

The function page_exists was not found. Maybe you did not declare it correctly or list all dependencies?

        /* previous revision*/ $wikipage->addVersionPrevious($pagerevs[$prevrev]);
        if ($nextrev !== false && $nextrev > -1 && page_exists($ID, $pagerevs[$nextrev]))
        /* next revision*/ $wikipage->addVersionNext($pagerevs[$nextrev]);

        /* latest revision   */ if ($REV) $wikipage->addVersionLatest();
        // TODO: topics
        /* has_container     */ if ($INFO['namespace']) $wikipage->addContainer($INFO['namespace']); 
        /* has_space         */ if ($this->getConf('owners')) $wikipage->addSite($this->getConf('owners')); 
        // TODO: dc:contributor / has_modifier
        // TODO: attachment (e.g. pictures in that dwns)
        
        // add wiki page to exporter
        $exporter->addObject($wikipage);
        //if ($INFO['editor'] && $this->getConf('userns')) $exporter->addObject($pageuser);
        
        return $exporter;
        
    }
    
    private function _exportContainercontent($exporter)
    {
        global $ID, $INFO, $conf;
        
        if ($ID == $conf['start'])
        {
            $title = $conf['title'];
        } elseif (isset($INFO['meta']['title']))
        {
            $title = $INFO['meta']['title'];
        } else
        {
            $title = $ID;
        }
        
    
        $exporter->setParameters('Container: '.$title,
                            getAbsUrl(),
                            getAbsUrl().'doku.php?',
                            'utf-8',
                            $this->agentlink
                            );

        // create container object
        $wikicontainer = new SIOCDokuWikiContainer($ID,
                                                    normalizeUri($exporter->siocURL('container', $ID))
                                                  );

        /* container is type=wiki */ if ($ID == $conf['start']) {
          $wikicontainer->isWiki();
        }
        /* sioc:name              */ if ($INFO['exists']) {
          $wikicontainer->addTitle($INFO['meta']['title']);
        }
        /* has_parent             */ if ($INFO['namespace']) {
          $wikicontainer->addParent($INFO['namespace']);
        }

        // search next level entries (posts, sub containers) in container
        require_once(DOKU_INC.'inc/search.php');

The constant DOKU_INC was not found. Maybe you did not declare it correctly or list all dependencies?

        $dir = utf8_encodeFN(str_replace(':', '/', $ID));

The function utf8_encodeFN was not found. Maybe you did not declare it correctly or list all dependencies?

        $entries = array();
        $posts = array();
        $containers = array();
        search($entries, $conf['datadir'], 'search_index', array('ns' => $ID), $dir);

The function search was not found. Maybe you did not declare it correctly or list all dependencies?

        foreach ($entries as $entry)
        {
            if ($entry['type'] === 'f')
            {
                // wikisite
                $posts[] = $entry;
            }
            elseif ($entry['type'] === 'd')
            {
                // sub container
                $containers[] = $entry;
            }
        }
        
        // without sub content it can't be a container (so it does not exist as a container)
        if (count($posts) + count($containers) == 0)
            $this->_exit("HTTP/1.0 404 Not Found");
        
        if (count($posts) > 0) $wikicontainer->addArticles($posts);
        if (count($containers) > 0) $wikicontainer->addContainers($containers);

        //print_r($containers);die();
        
        // add container to exporter
        $exporter->addObject($wikicontainer);
        
        return $exporter;
    }
    
    private function _exportUsercontent($exporter)
    {
        global $ID;
                
        // get user info
        $userinfo = getDwUserInfo($ID, $this);
        
        // no userinfo means there is n user space or user does not exists
        if ($userinfo === false) {
                    $this->_exit("HTTP/1.0 404 Not Found");
        }
        
        $exporter->setParameters('Account: '.$userinfo['name'],
                            getAbsUrl(),
                            getAbsUrl().'doku.php?',
                            'utf-8',
                            $this->agentlink
                            );
        // create user object
        //print_r($userinfo); die();
        $wikiuser = new SIOCDokuWikiUser($ID,
                                          normalizeUri($exporter->siocURL('user', $ID)),
                                          $userid,

The variable $userid does not exist. Did you maybe mean $userinfo?

                                          $userinfo['name'],
                                          $userinfo['mail']);
        /* TODO: avatar (using Gravatar) */
        /* TODO: creator_of */
        // add user to exporter
        $exporter->addObject($wikiuser);
        
        //print_r(headers_list());die();
        return $exporter;
    }
    
    private function _exit($headermsg)
    {
        header($headermsg);
        die();
    }

    private function _getDokuUrl($url = null)
    {
        return getAbsUrl($url);
    }
    
    private function _getDate($date, $date_alt = null)

The method _getDate() is not used, and could be removed.

    {
        if (!$date) $date = $date_alt;
        return date('c', $date);
    }
    
}

if (!function_exists('getAbsUrl'))
{
    function getAbsUrl($url = null)
    {
        if ($url == null) {
          $url = DOKU_BASE;

The constant DOKU_BASE was not found. Maybe you did not declare it correctly or list all dependencies?

        }
        return str_replace(DOKU_BASE, DOKU_URL, $url);

The constant DOKU_URL was not found. Maybe you did not declare it correctly or list all dependencies?

    }
}

if (!function_exists('getDwUserEmail'))
{
    function getDwUserEmail($user)
    {
        global $auth;
        if ($info = $auth->getUserData($user))
        {
            return $info['mail'];
        } else
        {
            return false;
        }
    }
}

if (!function_exists('getDwUserInfo'))
{
    function getDwUserInfo($id, $pobj, $key = null)
    {
        global $auth, $conf;
        
        if (!$pobj->getConf('userns')) {
          return false;
        }
        
        // get user id
        $userid = str_replace(cleanID($pobj->getConf('userns')).($conf['useslash'] ? '/' : ':'), '', $id);

The function cleanID was not found. Maybe you did not declare it correctly or list all dependencies?

        
        if ($info = $auth->getUserData($userid))
        {
            if ($key)
            {
                return $info['key'];
            } else
            {
                return $info;
            }
        } else
        {
            return false;
        }
    }
}

// sort query attributes by name
if (!function_exists('normalizeUri'))
{
    function normalizeUri($uri)
    {
        // part URI
        $parts = explode('?', $uri);
        
        // part query
        if (isset($parts[1]))
        {
            $query = $parts[1];
            
            // test separator
            $sep = '&';
            if (strpos($query, '&') !== false) {
              $sep = '&';
            }
            $attr = explode($sep, $query);
            
            sort($attr);
            
            $parts[1] = implode($sep, $attr);
        }
        
        return implode('?', $parts);
    }
}