gnu-social/plugins/WebFinger/lib/webfingerresource/profile.php

<?php
/**
 * WebFinger resource for Profile objects
 *
 * @package   GNUsocial
 * @author    Mikael Nordfeldth
 * @copyright 2013 Free Software Foundation, Inc.
 * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
 * @link      http://status.net/
 */

class WebFingerResource_Profile extends WebFingerResource
{
    const PROFILEPAGE = 'http://webfinger.net/rel/profile-page';

    public function __construct(Profile $object)
    {
        // The type argument above verifies that it's our class
        parent::__construct($object);
    }

    public function getAliases()
    {
        $aliases = array();

        // only persons ("accounts" or "agents" actually) have acct: URIs
        if ($this->object->isPerson()) {
            try {
                // Try to create an acct: URI if we're dealing with a profile
                $aliases[] = $this->reconstructAcct();
            } catch (WebFingerReconstructionException $e) {
                common_debug("WebFinger reconstruction for Profile failed (id={$this->object->getID()})");
            }
        }

        return array_merge($aliases, parent::getAliases());
    }

    public function reconstructAcct()
    {
        $acct = null;

        if (Event::handle('StartWebFingerReconstruction', array($this->object, &$acct))) {
            // TODO: getUri may not always give us the correct host on remote users?
            $host = parse_url($this->object->getUri(), PHP_URL_HOST);
            if (empty($this->object->getNickname()) || empty($host)) {
                throw new WebFingerReconstructionException($this->object);
            }
            $acct = mb_strtolower(sprintf('acct:%s@%s', $this->object->getNickname(), $host));

            Event::handle('EndWebFingerReconstruction', array($this->object, &$acct));
        }

        return $acct;
    }

    public function updateXRD(XML_XRD $xrd)
    {
        if (Event::handle('StartWebFingerProfileLinks', array($xrd, $this->object))) {

            if (common_config('site', 'fancy')) {
                $apiRoot = common_path('api/', true);
            } else {
                $apiRoot = common_path('index.php/api/', true);
            }

            // Profile page, can give more metadata from Link header or HTML parsing
            $xrd->links[] = new XML_XRD_Element_Link(self::PROFILEPAGE,
                                        $this->object->getUrl(), 'text/html');

            // XFN
            $xrd->links[] = new XML_XRD_Element_Link('http://gmpg.org/xfn/11',
                                        $this->object->getUrl(), 'text/html');
            if ($this->object->isPerson()) {
                // FOAF for user
                $xrd->links[] = new XML_XRD_Element_Link('describedby',
                                        common_local_url('foaf',
                                                        array('nickname' => $this->object->getNickname())),
                                                                'application/rdf+xml');

                // nickname discovery for apps etc.
                $link = new XML_XRD_Element_Link('http://apinamespace.org/atom',
                                        common_local_url('ApiAtomService',
                                                        array('id' => $this->object->getNickname())),
                                                                'application/atomsvc+xml');
                // XML_XRD must implement changing properties first           $link['http://apinamespace.org/atom/username'] = $this->object->getNickname();
                $xrd->links[] = clone $link;

                $link = new XML_XRD_Element_Link('http://apinamespace.org/twitter', $apiRoot);
                // XML_XRD must implement changing properties first            $link['http://apinamespace.org/twitter/username'] = $this->object->getNickname();
                $xrd->links[] = clone $link;

            } elseif ($this->object->isGroup()) {
                // FOAF for group
                $xrd->links[] = new XML_XRD_Element_Link('describedby',
                                        common_local_url('foafgroup',
                                                        array('nickname' => $this->object->getNickname())),
                                                                'application/rdf+xml');
            }

            Event::handle('EndWebFingerProfileLinks', array($xrd, $this->object));
        }
    }
}