gnu-social/components/FreeNetwork/Util/Discovery.php

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<?php
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declare(strict_types = 1);
/**
* StatusNet - the distributed open-source microblogging tool
* Copyright (C) 2010, StatusNet, Inc.
*
* This class performs lookups based on methods implemented in separate
* classes, where a resource uri is given. Examples are WebFinger (RFC7033)
* and the LRDD (Link-based Resource Descriptor Discovery) in RFC6415.
*
* PHP version 5
*
* This program 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.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Discovery
* @package GNUsocial
*
* @author James Walker <james@status.net>
* @author Mikael Nordfeldth <mmn@hethane.se>
* @copyright 2010 StatusNet, Inc.
* @copyright 2013 Free Software Foundation, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html AGPL 3.0
*
* @see http://www.gnu.org/software/social/
*/
namespace Component\FreeNetwork\Util;
use App\Core\Event;
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use App\Core\GSFile;
use App\Core\HTTPClient;
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use function App\Core\I18n\_m;
use App\Core\Log;
use App\Util\Exception\ClientException;
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use Exception;
use XML_XRD;
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use XML_XRD_Element_Link;
class Discovery
{
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public const LRDD_REL = 'lrdd';
public const UPDATESFROM = 'http://schemas.google.com/g/2010#updates-from';
public const HCARD = 'http://microformats.org/profile/hcard';
public const MF2_HCARD = 'http://microformats.org/profile/h-card'; // microformats2 h-card
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public const JRD_MIMETYPE_OLD = 'application/json'; // RFC6415 uses this
public const JRD_MIMETYPE = 'application/jrd+json';
public const XRD_MIMETYPE = 'application/xrd+xml';
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public array $methods = [];
/**
* Constructor for a discovery object
*
* Registers different discovery methods.
*/
public function __construct()
{
if (Event::handle('StartDiscoveryMethodRegistration', [$this])) {
Event::handle('EndDiscoveryMethodRegistration', [$this]);
}
}
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public static function supportedMimeTypes(): array
{
return [
'json' => self::JRD_MIMETYPE,
'jsonold' => self::JRD_MIMETYPE_OLD,
'xml' => self::XRD_MIMETYPE,
];
}
/**
* Register a discovery class
*
* @param string $class Class name
*/
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public function registerMethod($class): void
{
$this->methods[] = $class;
}
/**
* Given a user ID, return the first available resource descriptor
*
* @param string $id User ID URI
*
* @return XML_XRD object for the resource descriptor of the id
*/
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public function lookup(string $id): XML_XRD
{
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// Normalize the incoming $id to make sure we have an uri
$uri = self::normalize($id);
Log::debug(sprintf('Performing discovery for "%s" (normalized "%s")', $id, $uri));
foreach ($this->methods as $class) {
try {
$xrd = new XML_XRD();
Log::debug("LRDD discovery method for '{$uri}': {$class}");
$lrdd = new $class;
$links = $lrdd->discover($uri);
$link = self::getService($links, self::LRDD_REL);
// Load the LRDD XRD
if (!empty($link->template)) {
$xrd_uri = self::applyTemplate($link->template, $uri);
} elseif (!empty($link->href)) {
$xrd_uri = $link->href;
} else {
throw new Exception('No resource descriptor URI in link.');
}
$headers = [];
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if (!\is_null($link->type)) {
$headers['Accept'] = $link->type;
}
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$response = HTTPClient::get($xrd_uri, ['headers' => $headers]);
if ($response->getStatusCode() !== 200) {
throw new Exception('Unexpected HTTP status code.');
}
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switch (GSFile::mimetypeBare($response->getHeaders()['content-type'][0])) {
case self::JRD_MIMETYPE_OLD:
case self::JRD_MIMETYPE:
$type = 'json';
break;
case self::XRD_MIMETYPE:
$type = 'xml';
break;
default:
// fall back to letting XML_XRD auto-detect
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Log::debug('No recognized content-type header for resource descriptor body on ' . $xrd_uri);
$type = null;
}
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$xrd->loadString($response->getContent(), $type);
return $xrd;
} catch (ClientException $e) {
if ($e->getCode() === 403) {
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Log::info(sprintf('%s: Aborting discovery on URL %s: %s', $class, $uri, $e->getMessage()));
break;
}
} catch (Exception $e) {
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Log::info(sprintf('%s: Failed for %s: %s', $class, $uri, $e->getMessage()));
continue;
}
}
// TRANS: Exception. %s is an ID.
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throw new Exception(sprintf(_m('Unable to find services for %s.'), $id));
}
/**
* Given an array of links, returns the matching service
*
* @param array $links Links to check (as instances of XML_XRD_Element_Link)
* @param string $service Service to find
*
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* @return XML_XRD_Element_Link $link
*/
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public static function getService(array $links, $service): XML_XRD_Element_Link
{
foreach ($links as $link) {
if ($link->rel === $service) {
return $link;
}
Log::debug('LINK: rel ' . $link->rel . ' !== ' . $service);
}
throw new Exception('No service link found');
}
/**
* Given a "user id" make sure it's normalized to an acct: uri
*
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* @param string $uri User ID to normalize
*
* @return string normalized acct: URI
*/
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public static function normalize(string $uri): string
{
$parts = parse_url($uri);
// If we don't have a scheme, but the path implies user@host,
// though this is far from a perfect matching procedure...
if (!isset($parts['scheme']) && isset($parts['path'])
&& preg_match('/[\w@\w]/u', $parts['path'])) {
return 'acct:' . $uri;
}
return $uri;
}
public static function isAcct(string $uri): bool
{
return mb_strtolower(mb_substr($uri, 0, 5)) == 'acct:';
}
/**
* Apply a template using an ID
*
* Replaces {uri} in template string with the ID given.
*
* @param string $template Template to match
* @param string $uri URI to replace with
*
* @return string replaced values
*/
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public static function applyTemplate($template, $uri): string
{
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return str_replace('{uri}', urlencode($uri), $template);
}
}