129 lines
4.6 KiB
PHP
129 lines
4.6 KiB
PHP
<?php
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use Profile;
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/**
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* GNU social - a federating social network
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*
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* An activity
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*
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* PHP version 5
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*
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* LICENCE: 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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* @category Feed
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* @package GNUsocial
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* @author Daniel Supernault <danielsupernault@gmail.com>
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @copyright 2018 Free Software Foundaction, Inc.
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* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
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* @link https://gnu.io/social
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*/
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if (!defined('GNUSOCIAL')) { exit(1); }
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class Activitypub_Discovery {
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private $discovered_actor_profiles = array ();
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public function lookup ($url)
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{
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$this->discovered_actor_profiles = array ();
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return $this->_lookup ($url);;
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}
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private function _lookup ($url)
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{
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// First check if we already have it locally and, if so, return it
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// If the local fetch fails: grab it remotely, store locally and return
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$this->grab_local_user ($url) || $this->grab_remote_user($url);
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return $this->discovered_actor_profiles;
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}
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private function grab_local_user ($url)
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{
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if (($actor_profile = Profile::getKV ("profileurl", $url)) != false) {
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$this->discovered_actor_profiles[]= $actor_profile;
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return true;
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} else { // XXX:
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// Sometimes it is not true that the user is not locally available,
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// mostly when it is a local user and URLs slightly changed
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// e.g.: GS instance owner changed from standard urls to pretty urls
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// (not sure if this is necessary, but anyway)
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// Iff we really are in the same instance
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$root_url_len = strlen (common_root_url ());
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if (substr ($url, 0, $root_url_len) == common_root_url ()) {
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// Grab the nickname and try to get the user
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if (($actor_profile = Profile::getKV ("nickname", substr ($url, $root_url_len))) != false) {
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$this->discovered_actor_profiles[]= $actor_profile;
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return true;
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}
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}
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}
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return false;
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}
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private function grab_remote_user ($url)
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{
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$client = new HTTPClient ();
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$headers = array();
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$headers[] = 'Accept: application/ld+json; profile="https://www.w3.org/ns/activitystreams"';
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$headers[] = 'User-Agent: GNUSocialBot v0.1 - https://gnu.io/social';
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$response = $client->get ($url, $headers);
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if (!$response->isOk()) {
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throw new NoResultException ("Invalid Actor URL.");
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}
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$res = json_decode ($response->getBody (), JSON_UNESCAPED_SLASHES);
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if (isset ($res["orderedItems"])) { // It's a potential collection of actors!!!
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foreach ($res["orderedItems"] as $profile) {
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if ($this->_lookup ($profile) == false) {
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// XXX: Invalid actor found, not sure how we handle those
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}
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}
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// Go through entire collection
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if (!is_null ($res["next"])) {
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$this->_lookup ($res["next"]);
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}
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return true;
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} else if ($this->validate_remote_response ($res)) {
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$this->discovered_actor_profiles[]= $this->store_profile ($res);
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return true;
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}
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return false;
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}
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private function store_profile ($res) {
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$profile = new Profile;
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$profile->profileurl = $res["url"];
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$profile->nickname = $res["nickname"];
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$profile->fullname = $res["display_name"];
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$profile->bio = substr ($res["summary"], 0, 1000);
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$profile->insert ();
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return $profile;
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}
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private function validate_remote_response ($res)
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{
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if (!isset ($res["url"], $res["nickname"], $res["display_name"], $res["summary"])) {
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return false;
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}
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return true;
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}
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}
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