295 lines
10 KiB
PHP
295 lines
10 KiB
PHP
<?php
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declare(strict_types=1);
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// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social 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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// GNU social 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 GNU social. If not, see <http://www.gnu.org/licenses/>.
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// }}}
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/**
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* ActivityPub implementation for GNU social
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*
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* @package GNUsocial
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* @category ActivityPub
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* @author Diogo Peralta Cordeiro <@diogo.site>
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* @copyright 2018-2019, 2021 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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namespace Plugin\ActivityPub\Util;
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use App\Core\HTTPClient;
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use App\Core\Log;
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use App\Util\Exception\NoSuchActorException;
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use Exception;
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use Plugin\ActivityPub\ActivityPub;
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use Plugin\ActivityPub\Entity\ActivitypubActor;
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use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
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use Symfony\Contracts\HttpClient\Exception\RedirectionExceptionInterface;
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use Symfony\Contracts\HttpClient\Exception\ServerExceptionInterface;
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use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
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use function in_array;
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use function is_null;
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use const JSON_UNESCAPED_SLASHES;
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/**
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* ActivityPub's own Explorer
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*
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* Allows to discovery new remote actors
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*
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* @copyright 2021 Free Software Foundation, Inc http://www.fsf.org
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* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
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*/
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class Explorer
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{
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private array $discovered_activitypub_actor_profiles = [];
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/**
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* Shortcut function to get a single profile from its URL.
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*
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* @param string $url
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* @param bool $grab_online whether to try online grabbing, defaults to true
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*
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* @return ActivitypubActor
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* @throws ClientExceptionInterface
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* @throws NoSuchActorException
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* @throws RedirectionExceptionInterface
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* @throws ServerExceptionInterface
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* @throws TransportExceptionInterface
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*/
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public static function get_profile_from_url(string $url, bool $grab_online = true): ActivitypubActor
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{
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$discovery = new self();
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// Get valid Actor object
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$actor_profile = $discovery->lookup($url, $grab_online);
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if (!empty($actor_profile)) {
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return $actor_profile[0];
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}
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throw new NoSuchActorException('Invalid Actor.');
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}
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/**
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* Get every profile from the given URL
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* This function cleans the $this->discovered_actor_profiles array
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* so that there is no erroneous data
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*
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* @param string $url User's url
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* @param bool $grab_online whether to try online grabbing, defaults to true
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*
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* @throws ClientExceptionInterface
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* @throws NoSuchActorException
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* @throws RedirectionExceptionInterface
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* @throws ServerExceptionInterface
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* @throws TransportExceptionInterface
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*
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* @return array of Actor objects
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*/
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public function lookup(string $url, bool $grab_online = true)
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{
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if (in_array($url, ActivityPub::PUBLIC_TO)) {
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return [];
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}
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Log::debug('ActivityPub Explorer: Started now looking for ' . $url);
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$this->discovered_activitypub_actor_profiles = [];
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return $this->_lookup($url, $grab_online);
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}
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/**
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* Get every profile from the given URL
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* This is a recursive function that will accumulate the results on
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* $discovered_actor_profiles array
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*
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* @param string $url User's url
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* @param bool $grab_online whether to try online grabbing, defaults to true
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*
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* @throws ClientExceptionInterface
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* @throws NoSuchActorException
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* @throws RedirectionExceptionInterface
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* @throws ServerExceptionInterface
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* @throws TransportExceptionInterface
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*
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* @return array of ActivityPub Actor objects
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*/
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private function _lookup(string $url, bool $grab_online = true): array
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{
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$grab_known = $this->grab_known_user($url);
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// First check if we already have it locally and, if so, return it.
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// If the known fetch fails and remote grab is required: store locally and return.
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if (!$grab_known && (!$grab_online || !$this->grab_remote_user($url))) {
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throw new NoSuchActorException('Actor not found.');
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}
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return $this->discovered_activitypub_actor_profiles;
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}
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/**
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* Get a known user profile from its URL and joins it on
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* $this->discovered_actor_profiles
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*
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* @param string $uri Actor's uri
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*
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* @throws Exception
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* @throws NoSuchActorException
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*
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* @return bool success state
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*/
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private function grab_known_user(string $uri): bool
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{
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Log::debug('ActivityPub Explorer: Searching locally for ' . $uri . ' offline.');
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// Try standard ActivityPub route
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// Is this a known filthy little mudblood?
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$aprofile = self::get_aprofile_by_url($uri);
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if ($aprofile instanceof ActivitypubActor) {
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Log::debug('ActivityPub Explorer: Found a known Aprofile for ' . $uri);
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// We found something!
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$this->discovered_activitypub_actor_profiles[] = $aprofile;
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return true;
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} else {
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Log::debug('ActivityPub Explorer: Unable to find a known Aprofile for ' . $uri);
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}
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return false;
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}
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/**
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* Get a remote user(s) profile(s) from its URL and joins it on
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* $this->discovered_actor_profiles
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*
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* @param string $url User's url
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*
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* @throws ClientExceptionInterface
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* @throws NoSuchActorException
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* @throws RedirectionExceptionInterface
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* @throws ServerExceptionInterface
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* @throws TransportExceptionInterface
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*
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* @return bool success state
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*/
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private function grab_remote_user(string $url): bool
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{
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Log::debug('ActivityPub Explorer: Trying to grab a remote actor for ' . $url);
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$response = HTTPClient::get($url, ['headers' => ACTIVITYPUB::HTTP_CLIENT_HEADERS]);
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$res = json_decode($response->getContent(), true);
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if ($response->getStatusCode() == 410) { // If it was deleted
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return true; // Nothing to add.
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} elseif (!HTTPClient::statusCodeIsOkay($response)) { // If it is unavailable
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return false; // Try to add at another time.
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}
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if (is_null($res)) {
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Log::debug('ActivityPub Explorer: Invalid response returned from given Actor URL: ' . $res);
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return true; // Nothing to add.
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}
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if ($res['type'] === 'OrderedCollection') { // It's a potential collection of actors!!!
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Log::debug('ActivityPub Explorer: Found a collection of actors for ' . $url);
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$this->travel_collection($res['first']);
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return true;
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} else {
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try {
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$this->discovered_activitypub_actor_profiles[] = Model\Actor::fromJson(json_encode($res));
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return true;
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} catch (Exception $e) {
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Log::debug(
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'ActivityPub Explorer: Invalid potential remote actor while grabbing remotely: ' . $url
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. '. He returned the following: ' . json_encode($res, JSON_UNESCAPED_SLASHES)
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. ' and the following exception: ' . $e->getMessage()
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);
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return false;
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}
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}
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return false;
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}
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/**
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* Get a ActivityPub Profile from it's uri
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*
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* @param string $v URL
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*
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* @return ActivitypubActor|bool false if fails | Aprofile object if successful
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*/
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public static function get_aprofile_by_url(string $v): ActivitypubActor|bool
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{
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$aprofile = ActivitypubActor::getByPK(['uri' => $v]);
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return is_null($aprofile) ? false : ActivitypubActor::getByPK(['uri' => $v]);
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}
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/**
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* Allows the Explorer to transverse a collection of persons.
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*
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* @param string $url
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* @return bool
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* @throws ClientExceptionInterface
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* @throws NoSuchActorException
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* @throws RedirectionExceptionInterface
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* @throws ServerExceptionInterface
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* @throws TransportExceptionInterface
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*/
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private function travel_collection(string $url): bool
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{
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$response = HTTPClient::get($url, ['headers' => ACTIVITYPUB::HTTP_CLIENT_HEADERS]);
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$res = json_decode($response->getContent(), true);
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if (!isset($res['orderedItems'])) {
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return false;
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}
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foreach ($res['orderedItems'] as $profile) {
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if ($this->_lookup($profile) == false) {
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Log::debug('ActivityPub Explorer: Found an invalid actor for ' . $profile);
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}
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}
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// Go through entire collection
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if (!is_null($res['next'])) {
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$this->travel_collection($res['next']);
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}
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return true;
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}
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/**
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* Get a remote user array from its URL (this function is only used for
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* profile updating and shall not be used for anything else)
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*
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* @param string $url User's url
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*
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* @throws ClientExceptionInterface
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* @throws RedirectionExceptionInterface
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* @throws ServerExceptionInterface
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* @throws TransportExceptionInterface
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* @throws Exception
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*
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* @return string|null If it is able to fetch, false if it's gone
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* // Exceptions when network issues or unsupported Activity format
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*/
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public static function get_remote_user_activity(string $url): string|null
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{
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$response = HTTPClient::get($url, ['headers' => ACTIVITYPUB::HTTP_CLIENT_HEADERS]);
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// If it was deleted
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if ($response->getStatusCode() == 410) {
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return null;
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} elseif (!HTTPClient::statusCodeIsOkay($response)) { // If it is unavailable
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throw new Exception('Non Ok Status Code for given Actor URL.');
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}
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return $response->getContent();
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}
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}
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