588 lines
22 KiB
PHP
588 lines
22 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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*
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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;
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use ActivityPhp\Type;
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use App\Core\DB\DB;
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use App\Core\Event;
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use App\Core\HTTPClient;
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use App\Core\Log;
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use App\Core\Modules\Plugin;
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use App\Core\Router\RouteLoader;
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use App\Core\Router\Router;
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use App\Entity\Activity;
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use App\Entity\Actor;
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use App\Entity\LocalUser;
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use App\Entity\Note;
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use App\Util\Common;
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use App\Util\Exception\BugFoundException;
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use App\Util\Exception\NoSuchActorException;
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use App\Util\Nickname;
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use Component\Collection\Util\Controller\OrderedCollection;
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use Component\FreeNetwork\Entity\FreeNetworkActorProtocol;
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use Component\FreeNetwork\Util\Discovery;
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use Exception;
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use InvalidArgumentException;
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use const PHP_URL_HOST;
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use Plugin\ActivityPub\Controller\Inbox;
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use Plugin\ActivityPub\Controller\Outbox;
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use Plugin\ActivityPub\Entity\ActivitypubActivity;
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use Plugin\ActivityPub\Entity\ActivitypubActor;
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use Plugin\ActivityPub\Entity\ActivitypubObject;
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use Plugin\ActivityPub\Util\HTTPSignature;
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use Plugin\ActivityPub\Util\Model;
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use Plugin\ActivityPub\Util\OrderedCollectionController;
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use Plugin\ActivityPub\Util\Response\ActivityResponse;
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use Plugin\ActivityPub\Util\Response\ActorResponse;
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use Plugin\ActivityPub\Util\Response\NoteResponse;
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use Plugin\ActivityPub\Util\TypeResponse;
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use Plugin\ActivityPub\Util\Validator\contentLangModelValidator;
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use Plugin\ActivityPub\Util\Validator\manuallyApprovesFollowersModelValidator;
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use Symfony\Component\HttpFoundation\JsonResponse;
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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 Symfony\Contracts\HttpClient\ResponseInterface;
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use XML_XRD;
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use XML_XRD_Element_Link;
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/**
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* Adds ActivityPub support to GNU social when enabled
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*
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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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class ActivityPub extends Plugin
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{
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// ActivityStreams 2.0 Accept Headers
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public static array $accept_headers = [
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'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
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'application/activity+json',
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'application/json',
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'application/ld+json',
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];
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// So that this isn't hardcoded everywhere
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public const PUBLIC_TO = [
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'https://www.w3.org/ns/activitystreams#Public',
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'Public',
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'as:Public',
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];
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public const HTTP_CLIENT_HEADERS = [
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'Accept' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
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'User-Agent' => 'GNUsocialBot ' . GNUSOCIAL_VERSION . ' - ' . GNUSOCIAL_PROJECT_URL,
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];
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public function version(): string
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{
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return '3.0.0';
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}
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public static array $activity_streams_two_context = [
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'https://www.w3.org/ns/activitystreams',
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'https://w3id.org/security/v1',
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['gs' => 'https://www.gnu.org/software/social/ns#'],
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['litepub' => 'http://litepub.social/ns#'],
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['chatMessage' => 'litepub:chatMessage'],
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[
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'inConversation' => [
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'@id' => 'gs:inConversation',
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'@type' => '@id',
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],
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],
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];
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public function onInitializePlugin(): bool
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{
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Event::handle('ActivityStreamsTwoContext', [&self::$activity_streams_two_context]);
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self::$activity_streams_two_context = array_unique(self::$activity_streams_two_context, \SORT_REGULAR);
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return Event::next;
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}
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/**
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* This code executes when GNU social creates the page routing, and we hook
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* on this event to add our Inbox and Outbox handler for ActivityPub.
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*
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* @param RouteLoader $r the router that was initialized
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*/
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public function onAddRoute(RouteLoader $r): bool
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{
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$r->connect(
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'activitypub_inbox',
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'/inbox.json',
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Inbox::class,
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options: ['format' => self::$accept_headers[0]],
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);
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$r->connect(
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'activitypub_actor_inbox',
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'/actor/{gsactor_id<\d+>}/inbox.json',
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[Inbox::class, 'handle'],
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options: ['format' => self::$accept_headers[0]],
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);
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$r->connect(
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'activitypub_actor_outbox',
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'/actor/{gsactor_id<\d+>}/outbox.json',
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[Outbox::class, 'viewOutboxByActorId'],
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options: ['accept' => self::$accept_headers, 'format' => self::$accept_headers[0]],
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);
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return Event::next;
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}
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/**
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* Fill Actor->getUrl() calls with correct URL coming from ActivityPub
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*/
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public function onStartGetActorUri(Actor $actor, int $type, ?string &$url): bool
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{
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if (
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// Is remote?
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!$actor->getIsLocal()
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// Is in ActivityPub?
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&& !\is_null($ap_actor = DB::findOneBy(ActivitypubActor::class, ['actor_id' => $actor->getId()], return_null: true))
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// We can only provide a full URL (anything else wouldn't make sense)
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&& $type === Router::ABSOLUTE_URL
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) {
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$url = $ap_actor->getUri();
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return Event::stop;
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}
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return Event::next;
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}
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/**
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* Fill Actor->canAdmin() for Actors that came from ActivityPub
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*/
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public function onFreeNetworkActorCanAdmin(Actor $actor, Actor $other, bool &$canAdmin): bool
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{
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// Are both in AP?
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if (
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!\is_null($ap_actor = DB::findOneBy(ActivitypubActor::class, ['actor_id' => $actor->getId()], return_null: true))
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&& !\is_null($ap_other = DB::findOneBy(ActivitypubActor::class, ['actor_id' => $other->getId()], return_null: true))
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) {
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// Are they both in the same server?
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$canAdmin = parse_url($ap_actor->getUri(), PHP_URL_HOST) === parse_url($ap_other->getUri(), PHP_URL_HOST);
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return Event::stop;
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}
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return Event::next;
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}
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/**
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* Overload core endpoints to make resources available in ActivityStreams 2.0
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*
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* @throws Exception
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*/
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public function onControllerResponseInFormat(string $route, array $accept_header, array $vars, ?TypeResponse &$response = null): bool
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{
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if (\count(array_intersect(self::$accept_headers, $accept_header)) === 0) {
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return Event::next;
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}
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switch ($route) {
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case 'actor_view_id':
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case 'person_actor_view_id':
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case 'person_actor_view_nickname':
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case 'group_actor_view_id':
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case 'group_actor_view_nickname':
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case 'bot_actor_view_id':
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case 'bot_actor_view_nickname':
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$response = ActorResponse::handle($vars['actor']);
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break;
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case 'activity_view':
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$response = ActivityResponse::handle($vars['activity']);
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break;
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case 'note_view':
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$response = NoteResponse::handle($vars['note']);
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break;
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case 'activitypub_actor_outbox':
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$response = new TypeResponse($vars['type']);
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break;
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default:
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if (Event::handle('ActivityPubActivityStreamsTwoResponse', [$route, $vars, &$response]) !== Event::stop) {
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if (is_subclass_of($vars['controller'][0], OrderedCollection::class)) {
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$response = new TypeResponse(OrderedCollectionController::fromControllerVars($vars)['type']);
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} else {
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$response = new JsonResponse(['error' => 'Unknown Object cannot be represented.']);
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}
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}
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}
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return Event::stop;
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}
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/**
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* Add ActivityStreams 2 Extensions
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*/
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public function onActivityPubValidateActivityStreamsTwoData(string $type_name, array &$validators): bool
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{
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switch ($type_name) {
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case 'Person':
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$validators['manuallyApprovesFollowers'] = manuallyApprovesFollowersModelValidator::class;
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break;
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case 'Note':
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$validators['contentLang'] = contentLangModelValidator::class;
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break;
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}
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return Event::next;
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}
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// FreeNetworkComponent Events
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/**
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* Let FreeNetwork Component know we exist and which class to use to call the freeNetworkDistribute method
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*/
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public function onAddFreeNetworkProtocol(array &$protocols): bool
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{
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$protocols[] = '\Plugin\ActivityPub\ActivityPub';
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return Event::next;
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}
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/**
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* The FreeNetwork component will call this function to pull ActivityPub objects by URI
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*
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* @param string $uri Query
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*
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* @return bool true if imported, false otherwise
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*/
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public static function freeNetworkGrabRemote(string $uri): bool
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{
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if (Common::isValidHttpUrl($uri)) {
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try {
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$object = self::getObjectByUri($uri);
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if (!\is_null($object)) {
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if ($object instanceof Type\AbstractObject) {
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if (\in_array($object->get('type'), array_keys(Model\Actor::$_as2_actor_type_to_gs_actor_type))) {
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DB::wrapInTransaction(fn () => Model\Actor::fromJson($object));
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} else {
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DB::wrapInTransaction(fn () => Model\Activity::fromJson($object));
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}
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}
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return true;
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}
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} catch (Exception|Throwable) {
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// May be invalid input, we can safely ignore in this case
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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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* The FreeNetwork component will call this function to distribute this instance's activities
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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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*/
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public static function freeNetworkDistribute(Actor $sender, Activity $activity, array $targets, ?string $reason = null, array &$delivered = []): bool
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{
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$to_addr = [];
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foreach ($targets as $actor) {
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if (FreeNetworkActorProtocol::canIActor('activitypub', $actor->getId())) {
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if (\is_null($ap_target = DB::findOneBy(ActivitypubActor::class, ['actor_id' => $actor->getId()], return_null: true))) {
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continue;
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}
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$to_addr[$ap_target->getInboxSharedUri() ?? $ap_target->getInboxUri()][] = $actor;
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} else {
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return Event::next;
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}
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}
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$errors = [];
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//$to_failed = [];
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foreach ($to_addr as $inbox => $dummy) {
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try {
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$data = Model::toJson($activity);
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if ($sender->isGroup()) {
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// When the sender is a group, we have to wrap it in an Announce activity
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$data = Type::create('Announce', ['object' => $data])->toJson();
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}
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$res = self::postman($sender, $data, $inbox);
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// accumulate errors for later use, if needed
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$status_code = $res->getStatusCode();
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if (!($status_code === 200 || $status_code === 202 || $status_code === 409)) {
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$res_body = json_decode($res->getContent(), true);
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$errors[] = $res_body['error'] ?? 'An unknown error occurred.';
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//$to_failed[$inbox] = $activity;
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} else {
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array_push($delivered, ...$dummy);
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foreach ($dummy as $actor) {
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FreeNetworkActorProtocol::protocolSucceeded(
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'activitypub',
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$actor,
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Discovery::normalize($actor->getNickname() . '@' . parse_url($inbox, PHP_URL_HOST)),
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);
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}
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}
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} catch (Exception $e) {
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Log::error('ActivityPub @ freeNetworkDistribute: ' . $e->getMessage(), [$e]);
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//$to_failed[$inbox] = $activity;
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}
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}
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if (!empty($errors)) {
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Log::error(sizeof($errors) . ' instance/s failed to handle our activity!');
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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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* Internal tool to sign and send activities out
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*
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* @throws Exception
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*/
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private static function postman(Actor $sender, string $json_activity, string $inbox, string $method = 'post'): ResponseInterface
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{
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Log::debug('ActivityPub Postman: Delivering ' . $json_activity . ' to ' . $inbox);
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$headers = HTTPSignature::sign($sender, $inbox, $json_activity);
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Log::debug('ActivityPub Postman: Delivery headers were: ' . print_r($headers, true));
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$response = HTTPClient::$method($inbox, ['headers' => $headers, 'body' => $json_activity]);
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Log::debug('ActivityPub Postman: Delivery result with status code ' . $response->getStatusCode() . ': ' . $response->getContent());
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return $response;
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}
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// WebFinger Events
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/**
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* Add activity+json mimetype to WebFinger
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*/
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public function onEndWebFingerProfileLinks(XML_XRD $xrd, Actor $object): bool
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{
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if ($object->isPerson()) {
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$link = new XML_XRD_Element_Link(
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rel: 'self',
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href: $object->getUri(Router::ABSOLUTE_URL),//Router::url('actor_view_id', ['id' => $object->getId()], Router::ABSOLUTE_URL),
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type: 'application/activity+json',
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);
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$xrd->links[] = clone $link;
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}
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return Event::next;
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}
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/**
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* When FreeNetwork component asks us to help with identifying Actors from XRDs
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*/
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public function onFreeNetworkFoundXrd(XML_XRD $xrd, ?Actor &$actor = null): bool
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{
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$addr = null;
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foreach ($xrd->aliases as $alias) {
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if (Discovery::isAcct($alias)) {
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$addr = Discovery::normalize($alias);
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}
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}
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if (\is_null($addr)) {
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return Event::next;
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} else {
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if (!FreeNetworkActorProtocol::canIAddr('activitypub', $addr)) {
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return Event::next;
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}
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}
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try {
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$ap_actor = ActivitypubActor::fromXrd($addr, $xrd);
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$actor = Actor::getById($ap_actor->getActorId());
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FreeNetworkActorProtocol::protocolSucceeded('activitypub', $actor, $addr);
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return Event::stop;
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} catch (Exception $e) {
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Log::error('ActivityPub Actor from URL Mention check failed: ' . $e->getMessage());
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return Event::next;
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}
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}
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// Discovery Events
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/**
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* When FreeNetwork component asks us to help with identifying Actors from URIs
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*/
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public function onFreeNetworkFindMentions(string $target, ?Actor &$actor = null): bool
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{
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try {
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if (FreeNetworkActorProtocol::canIAddr('activitypub', $addr = Discovery::normalize($target))) {
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$ap_actor = DB::wrapInTransaction(fn () => ActivitypubActor::getByAddr($addr));
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$actor = Actor::getById($ap_actor->getActorId());
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FreeNetworkActorProtocol::protocolSucceeded('activitypub', $actor->getId(), $addr);
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return Event::stop;
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} else {
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return Event::next;
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}
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} catch (Exception $e) {
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Log::error('ActivityPub WebFinger Mention check failed.', [$e]);
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return Event::next;
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}
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}
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/**
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* @return string got from URI
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*/
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public static function getUriByObject(mixed $object): string
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{
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switch ($object::class) {
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case Note::class:
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if ($object->getIsLocal()) {
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return $object->getUrl();
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} else {
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// Try known remote objects
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$known_object = DB::findOneBy(ActivitypubObject::class, ['object_type' => 'note', 'object_id' => $object->getId()], return_null: true);
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if ($known_object instanceof ActivitypubObject) {
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return $known_object->getObjectUri();
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} else {
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throw new BugFoundException('ActivityPub cannot generate an URI for a stored note.', [$object, $known_object]);
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}
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}
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break;
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case Actor::class:
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return $object->getUri();
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break;
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case Activity::class:
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// Try known remote activities
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$known_activity = DB::findOneBy(ActivitypubActivity::class, ['activity_id' => $object->getId()], return_null: true);
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if (!\is_null($known_activity)) {
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return $known_activity->getActivityUri();
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} else {
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return Router::url('activity_view', ['id' => $object->getId()], Router::ABSOLUTE_URL);
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}
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break;
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default:
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throw new InvalidArgumentException('ActivityPub::getUriByObject found a limitation with: ' . var_export($object, true));
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}
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}
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/**
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* Get a Note from ActivityPub URI, if it doesn't exist, attempt to fetch it
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* This should only be necessary internally.
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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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*
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* @return null|Actor|mixed|Note got from URI
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*/
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public static function getObjectByUri(string $resource, bool $try_online = true)
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{
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// Try known object
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$known_object = DB::findOneBy(ActivitypubObject::class, ['object_uri' => $resource], return_null: true);
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if (!\is_null($known_object)) {
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return $known_object->getObject();
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}
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// Try known activity
|
|
$known_activity = DB::findOneBy(ActivitypubActivity::class, ['activity_uri' => $resource], return_null: true);
|
|
if (!\is_null($known_activity)) {
|
|
return $known_activity->getActivity();
|
|
}
|
|
|
|
// Try local Note
|
|
if (Common::isValidHttpUrl($resource)) {
|
|
$resource_parts = parse_url($resource);
|
|
// TODO: Use URLMatcher
|
|
if ($resource_parts['host'] === Common::config('site', 'server')) {
|
|
$local_note = DB::findOneBy('note', ['url' => $resource], return_null: true);
|
|
if (!\is_null($local_note)) {
|
|
return $local_note;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Try Actor
|
|
try {
|
|
return self::getActorByUri($resource, try_online: false);
|
|
} catch (Exception) {
|
|
// Ignore, this is brute forcing, it's okay not to find
|
|
}
|
|
|
|
// Try remote
|
|
if (!$try_online) {
|
|
return;
|
|
}
|
|
|
|
$response = HTTPClient::get($resource, ['headers' => self::HTTP_CLIENT_HEADERS]);
|
|
// If it was deleted
|
|
if ($response->getStatusCode() == 410) {
|
|
//$obj = Type::create('Tombstone', ['id' => $resource]);
|
|
return;
|
|
} elseif (!HTTPClient::statusCodeIsOkay($response)) { // If it is unavailable
|
|
throw new Exception('Non Ok Status Code for given Object id.');
|
|
} else {
|
|
return Model::jsonToType($response->getContent());
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get an Actor from ActivityPub URI, if it doesn't exist, attempt to fetch it
|
|
* This should only be necessary internally.
|
|
*
|
|
* @throws NoSuchActorException
|
|
*
|
|
* @return Actor got from URI
|
|
*/
|
|
public static function getActorByUri(string $resource, bool $try_online = true): Actor
|
|
{
|
|
// Try local
|
|
if (Common::isValidHttpUrl($resource)) {
|
|
// This means $resource is a valid url
|
|
$resource_parts = parse_url($resource);
|
|
// TODO: Use URLMatcher
|
|
if ($resource_parts['host'] === Common::config('site', 'server')) {
|
|
$str = $resource_parts['path'];
|
|
// actor_view_nickname
|
|
$renick = '/\/@(' . Nickname::DISPLAY_FMT . ')\/?/m';
|
|
// actor_view_id
|
|
$reuri = '/\/actor\/(\d+)\/?/m';
|
|
if (preg_match_all($renick, $str, $matches, PREG_SET_ORDER, 0) === 1) {
|
|
return DB::findOneBy(LocalUser::class, ['nickname' => $matches[0][1]])->getActor();
|
|
} elseif (preg_match_all($reuri, $str, $matches, PREG_SET_ORDER, 0) === 1) {
|
|
return Actor::getById((int) $matches[0][1]);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Try known remote
|
|
$aprofile = DB::findOneBy(ActivitypubActor::class, ['uri' => $resource], return_null: true);
|
|
if (!\is_null($aprofile)) {
|
|
return Actor::getById($aprofile->getActorId());
|
|
}
|
|
|
|
// Try remote
|
|
if ($try_online) {
|
|
$aprofile = ActivitypubActor::getByAddr($resource);
|
|
if ($aprofile instanceof ActivitypubActor) {
|
|
return Actor::getById($aprofile->getActorId());
|
|
}
|
|
}
|
|
throw new NoSuchActorException("From URI: {$resource}");
|
|
}
|
|
}
|