. */ /** * Uses WebFinger to implement remote notice retrieval for GNU social. * * Depends on: WebFinger plugin * * @package GNUsocial * @author Mikael Nordfeldth */ if (!defined('GNUSOCIAL')) { exit(1); } class FetchRemotePlugin extends Plugin { const PLUGIN_VERSION = '2.0.0'; static function fetchNoticeFromUrl($url) { if (!common_valid_http_url($url)) { throw new InvalidUrlException($url); } $host = parse_url($url, PHP_URL_HOST); // TODO: try to fetch directly, either by requesting Atom or // Link headers/ elements with rel=alternate and compare // the remote domain name with the notice URL's. if (!$stored instanceof Notice) { common_log(LOG_INFO, 'Could not fetch remote notice from URL: '._ve($url)); throw new ServerException('Could not fetch remote notice.'); } return $stored; } public function onFetchRemoteNoticeWithSource($uri, Profile $source, &$stored) { if (common_valid_http_url($uri) && !Event::handle('FetchRemoteNoticeFromUrl', array($url, &$stored))) { // Woopi, we got it straight from a URL-formatted URI! return false; } // Let's assume we can only do this over HTTPS and a proper // WebFinger (RFC7033) endpoint on /.well-known/webfinger try { $source_url = parse_url($source->getUrl()); } catch (InvalidUrlException $e) { return true; } if ($source_url['scheme'] !== 'https') { common_debug('Will not try to fetch remote notice from non-HTTPS capable profile source'); return true; } try { $port = isset($source_url['port']) ? ":{$source_url['port']}" : ''; $rfc7033 = "https://{$source_url['host']}{$port}/.well-known/webfinger"; $params = ['resource' => $uri]; common_debug(__METHOD__ . ": getting json data about notice from: {$rfc7033}?resource=$uri"); $json = HTTPClient::quickGetJson($rfc7033, $params); } catch (Exception $e) { // NOPE NOPE NOPE NOPE // couldn't get remote data about this notice's URI // FIXME: try later? return true; } if (!isset($json->aliases)) { // FIXME: malformed json for our current use, but maybe we could find rel="alternate" type="text/html"? return true; } common_debug(__METHOD__ . ": Found these aliases: "._ve($json->aliases)); foreach ($json->aliases as $alias) { try { $stored = self::fetchNoticeFromUrl($url); if ($stored instanceof Notice) { // we're done here! all good, let's get back to business return false; } } catch (InvalidUrlException $e) { /// mmmmye, aliases might not always be HTTP(S) URLs. } catch (Exception $e) { // oh well, try the next one and see if it works better. common_debug(__METHOD__ . ": {$e->getMessage()}"); } } // Nothing found, return true to continue processing the event return true; } public function onPluginVersion(array &$versions): bool { $versions[] = array('name' => 'FetchRemote', 'version' => self::PLUGIN_VERSION, 'author' => 'Mikael Nordfeldth', 'homepage' => GNUSOCIAL_ENGINE_URL, // TRANS: Plugin description. 'rawdescription' => _m('Retrieves remote notices (and serves local) via WebFinger')); return true; } }