forked from GNUsocial/gnu-social
120 lines
4.5 KiB
PHP
120 lines
4.5 KiB
PHP
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<?php
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/*
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* GNU social - a federating social network
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* Copyright (C) 2013-2014, Free Software Foundation, Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* Uses WebFinger to implement remote notice retrieval for GNU social.
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*
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* Depends on: WebFinger plugin
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*
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* @package GNUsocial
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* @author Mikael Nordfeldth <mmn@hethane.se>
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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class FetchRemotePlugin extends Plugin
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{
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static function fetchNoticeFromUrl($url)
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{
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if (!common_valid_http_url($url)) {
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throw new InvalidUrlException($url);
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}
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$host = parse_url($url, PHP_URL_HOST);
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// TODO: try to fetch directly, either by requesting Atom or
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// Link headers/<head> elements with rel=alternate and compare
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// the remote domain name with the notice URL's.
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if (!$stored instanceof Notice) {
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common_log(LOG_INFO, 'Could not fetch remote notice from URL: '._ve($url));
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throw new ServerException('Could not fetch remote notice.');
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}
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return $stored;
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}
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public function onFetchRemoteNoticeWithSource($uri, Profile $source, &$stored)
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{
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if (common_valid_http_url($uri) && !Event::handle('FetchRemoteNoticeFromUrl', array($url, &$stored))) {
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// Woopi, we got it straight from a URL-formatted URI!
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return false;
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}
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// Let's assume we can only do this over HTTPS and a proper
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// WebFinger (RFC7033) endpoint on /.well-known/webfinger
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try {
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$source_url = parse_url($source->getUrl());
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} catch (InvalidUrlException $e) {
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return true;
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}
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if ($source_url['scheme'] !== 'https') {
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common_debug('Will not try to fetch remote notice from non-HTTPS capable profile source');
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return true;
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}
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try {
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$port = isset($source_url['port']) ? ":{$source_url['port']}" : '';
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$rfc7033 = "https://{$source_url['host']}{$port}/.well-known/webfinger";
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$params = ['resource' => $uri];
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common_debug(__METHOD__ . ": getting json data about notice from: {$rfc7033}?resource=$uri");
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$json = HTTPClient::quickGetJson($rfc7033, $params);
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} catch (Exception $e) {
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// NOPE NOPE NOPE NOPE
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// couldn't get remote data about this notice's URI
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// FIXME: try later?
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return true;
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}
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if (!isset($json->aliases)) {
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// FIXME: malformed json for our current use, but maybe we could find rel="alternate" type="text/html"?
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return true;
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}
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common_debug(__METHOD__ . ": Found these aliases: "._ve($json->aliases));
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foreach ($json->aliases as $alias) {
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try {
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$stored = self::fetchNoticeFromUrl($url);
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if ($stored instanceof Notice) {
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// we're done here! all good, let's get back to business
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return false;
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}
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} catch (InvalidUrlException $e) {
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/// mmmmye, aliases might not always be HTTP(S) URLs.
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} catch (Exception $e) {
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// oh well, try the next one and see if it works better.
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common_debug(__METHOD__ . ": {$e->getMessage()}");
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}
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}
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// Nothing found, return true to continue processing the event
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return true;
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}
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public function onPluginVersion(array &$versions)
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{
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$versions[] = array('name' => 'FetchRemote',
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'version' => GNUSOCIAL_VERSION,
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'author' => 'Mikael Nordfeldth',
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'homepage' => 'http://www.gnu.org/software/social/',
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// TRANS: Plugin description.
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'rawdescription' => _m('Retrieves remote notices (and serves local) via WebFinger'));
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return true;
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}
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}
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