gnu-social/plugins/ActivityPub/Util/DiscoveryHints.php

<?php

declare(strict_types = 1);

namespace Plugin\ActivityPub\Util;

// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social.  If not, see <http://www.gnu.org/licenses/>.
use App\Core\Event;
use App\Core\HTTPClient;
use Component\FreeNetwork\Util\Discovery;
use Component\FreeNetwork\Util\WebfingerResource\WebfingerResourceActor;
use Mf2 as Mf2;
use XML_XRD;

/**
 * ActivityPub implementation for GNU social
 *
 * @package   GNUsocial
 *
 * @author    Evan Prodromou
 * @author    Brion Vibber
 * @author    James Walker
 * @author    Siebrand Mazeland
 * @author    Mikael Nordfeldth
 * @author    Diogo Cordeiro
 * @copyright 2010, 2019, 2021 Free Software Foundation, Inc http://www.fsf.org
 * @license   https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
 *
 * @see      http://www.gnu.org/software/social/
 */
class DiscoveryHints
{
    public static function fromXRD(XML_XRD $xrd)
    {
        $hints = [];

        if (Event::handle('StartDiscoveryHintsFromXRD', [$xrd, &$hints])) {
            foreach ($xrd->links as $link) {
                if ($link->rel === 'self' && $link->type === 'application/activity+json') {
                    $hints['activitypub'] = $link->href;
                    break;
                }
            }
            Event::handle('EndDiscoveryHintsFromXRD', [$xrd, &$hints]);
        }

        return $hints;
    }
}
//class DiscoveryHints
//{
//    public static function fromXRD(XML_XRD $xrd)
//    {
//        $hints = [];
//
//        if (Event::handle('StartDiscoveryHintsFromXRD', [$xrd, &$hints])) {
//            foreach ($xrd->links as $link) {
//                switch ($link->rel) {
//                    case WebfingerResourceActor::PROFILEPAGE:
//                        $hints['profileurl'] = $link->href;
//                        break;
//                    case Discovery::UPDATESFROM:
//                        if (empty($link->type) || $link->type == 'application/atom+xml') {
//                            $hints['feedurl'] = $link->href;
//                        }
//                        break;
//                    case Discovery::HCARD:
//                    case Discovery::MF2_HCARD:
//                        $hints['hcard'] = $link->href;
//                        break;
//                    default:
//                        break;
//                }
//            }
//            Event::handle('EndDiscoveryHintsFromXRD', [$xrd, &$hints]);
//        }
//
//        return $hints;
//    }
//
//    public static function fromHcardUrl($url)
//    {
//        $response = HTTPClient::get($url, ['headers' => ['Accept' => 'text/html,application/xhtml+xml']]);
//
//        if (!HTTPClient::statusCodeIsOkay($response)) {
//            return null;
//        }
//
//        return self::hcardHints(
//            $response->getContent(),
//            HTTPClient::getEffectiveUrl($response)
//        );
//    }
//
//    public static function hcardHints($body, $url)
//    {
//        $hcard = self::hcard($body, $url);
//
//        if (empty($hcard)) {
//            return [];
//        }
//
//        $hints = [];
//
//        // XXX: don't copy stuff into an array and then copy it again
//
//        if (array_key_exists('nickname', $hcard) && !empty($hcard['nickname'][0])) {
//            $hints['nickname'] = $hcard['nickname'][0];
//        }
//
//        if (array_key_exists('name', $hcard) && !empty($hcard['name'][0])) {
//            $hints['fullname'] = $hcard['name'][0];
//        }
//
//        if (array_key_exists('photo', $hcard) && count($hcard['photo'])) {
//            $hints['avatar'] = $hcard['photo'][0];
//        }
//
//        if (array_key_exists('note', $hcard) && !empty($hcard['note'][0])) {
//            $hints['bio'] = $hcard['note'][0];
//        }
//
//        if (array_key_exists('adr', $hcard) && !empty($hcard['adr'][0])) {
//            $hints['location'] = $hcard['adr'][0]['value'];
//        }
//
//        if (array_key_exists('url', $hcard) && !empty($hcard['url'][0])) {
//            $hints['homepage'] = $hcard['url'][0];
//        }
//
//        return $hints;
//    }
//
//    private static function hcard($body, $url)
//    {
//        $mf2 = new Mf2\Parser($body, $url);
//        $mf2 = $mf2->parse();
//
//        if (empty($mf2['items'])) {
//            return null;
//        }
//
//        $hcards = [];
//
//        foreach ($mf2['items'] as $item) {
//            if (!in_array('h-card', $item['type'])) {
//                continue;
//            }
//
//            // We found a match, return it immediately
//            if (isset($item['properties']['url']) && in_array($url, $item['properties']['url'])) {
//                return $item['properties'];
//            }
//
//            // Let's keep all the hcards for later, to return one of them at least
//            $hcards[] = $item['properties'];
//        }
//
//        // No match immediately for the url we expected, but there were h-cards found
//        if (count($hcards) > 0) {
//            return $hcards[0];
//        }
//
//        return null;
//    }
//}