219 lines
9.1 KiB
PHP
219 lines
9.1 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 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\Model;
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use ActivityPhp\Type;
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use ActivityPhp\Type\AbstractObject;
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use App\Core\DB;
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use App\Core\Event;
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use App\Core\Log;
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use App\Core\Router;
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use App\Entity\Activity as GSActivity;
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use App\Util\Common;
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use App\Util\Exception\ClientException;
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use App\Util\Exception\NoSuchActorException;
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use App\Util\Exception\NotFoundException;
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use App\Util\Exception\NotImplementedException;
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use DateTimeInterface;
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use Exception;
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use InvalidArgumentException;
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use Plugin\ActivityPub\ActivityPub;
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use Plugin\ActivityPub\Entity\ActivitypubActivity;
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use Plugin\ActivityPub\Util\Explorer;
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use Plugin\ActivityPub\Util\Model;
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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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/**
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* This class handles translation between JSON and ActivityPub Activities
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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 Activity extends Model
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{
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/**
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* Create an Entity from an ActivityStreams 2.0 JSON string
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* This will persist new GSActivities, GSObjects, and APActivity
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*
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* @throws ClientExceptionInterface
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* @throws NoSuchActorException
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* @throws NotImplementedException
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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 fromJson(string|AbstractObject $json, array $options = []): ActivitypubActivity
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{
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$type_activity = \is_string($json) ? self::jsonToType($json) : $json;
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// Ditch known activities
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if ($type_activity->has('id')) { // We can't dereference a transient activity
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$ap_act = DB::findOneBy(ActivitypubActivity::class, ['activity_uri' => $type_activity->get('id')], return_null: true);
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if (!\is_null($ap_act)) {
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return $ap_act;
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}
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}
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// Find Actor and Object
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$actor = Explorer::getOneFromUri($type_activity->get('actor'));
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$type_object = $type_activity->get('object');
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if (\is_string($type_object)) {
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if (Common::isValidHttpUrl($type_object)) { // Retrieve it
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$type_object = ActivityPub::getObjectByUri($type_object, try_online: true);
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} else {
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$type_object = Type::fromJson($type_object);
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}
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}
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if ($type_object instanceof AbstractObject) { // Encapsulated, if we have it locally, prefer it
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// TODO: Test authority of activity over object
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try {
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$type_object = ActivityPub::getObjectByUri($type_object->get('id'), try_online: false);
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} catch (Exception $e) {
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// Use the encapsulated then
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Log::debug('Failed to find a local activity, will continue with encapsulated.', [$e]);
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}
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}
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if (($type_object instanceof Type\AbstractObject)) { // It's a new object apparently
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if (Event::handle('NewActivityPubActivity', [$actor, $type_activity, $type_object, &$ap_act]) !== Event::stop) {
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return self::handle_core_activity($actor, $type_activity, $type_object, $ap_act);
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}
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} else { // Object was already stored locally then
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if (Event::handle('NewActivityPubActivityWithObject', [$actor, $type_activity, $type_object, &$ap_act]) !== Event::stop) {
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return self::handle_core_activity($actor, $type_activity, $type_object, $ap_act);
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}
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}
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return $ap_act;
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}
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private static function handle_core_activity(\App\Entity\Actor $actor, AbstractObject $type_activity, mixed $type_object, ?ActivitypubActivity &$ap_act): ActivitypubActivity
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{
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switch ($type_activity->get('type')) {
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case 'Create':
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ActivityCreate::handle_core_activity($actor, $type_activity, $type_object, $ap_act);
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break;
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case 'Follow':
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ActivityFollow::handle_core_activity($actor, $type_activity, $type_object, $ap_act);
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break;
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case 'Undo':
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$object_type = $type_object instanceof AbstractObject ? match ($type_object->get('type')) {
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'Note' => \App\Entity\Note::class,
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// no break
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default => throw new NotImplementedException('Unsupported Undo of Object Activity.'),
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} : $type_object::class;
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switch ($object_type) {
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case GSActivity::class:
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switch ($type_object->getVerb()) {
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case 'subscribe':
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ActivityFollow::handle_undo($actor, $type_activity, $type_object, $ap_act);
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break;
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}
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break;
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}
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break;
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case 'Announce':
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ActivityAnnounce::handle_core_activity($actor, $type_activity, $type_object, $ap_act);
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break;
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}
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return $ap_act;
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}
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/**
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* Get a JSON
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*
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* @throws ClientException
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*/
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public static function toType(mixed $object): AbstractObject
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{
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if ($object::class !== GSActivity::class) {
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throw new InvalidArgumentException('First argument type must be an Activity.');
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}
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$gs_verb_to_activity_streams_two_verb = null;
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if (Event::handle('GSVerbToActivityStreamsTwoActivityType', [($verb = $object->getVerb()), &$gs_verb_to_activity_streams_two_verb]) === Event::next) {
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$gs_verb_to_activity_streams_two_verb = match ($verb) {
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'undo' => 'Undo',
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'create' => 'Create',
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'subscribe' => 'Follow',
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default => throw new ClientException('Invalid verb'),
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};
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}
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$attr = [
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'type' => $gs_verb_to_activity_streams_two_verb,
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'@context' => ActivityPub::$activity_streams_two_context,
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'instrument' => Type::create('Service', [
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'name' => 'GNU social ActivityPub Plugin - v' . ActivityPub::version(),
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'url' => GNUSOCIAL_ENGINE_URL,
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]),
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'id' => Router::url('activity_view', ['id' => $object->getId()], Router::ABSOLUTE_URL),
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'published' => $object->getCreated()->format(DateTimeInterface::RFC3339),
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'actor' => $object->getActor()->getUri(Router::ABSOLUTE_URL),
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];
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$attr['to'] = ['https://www.w3.org/ns/activitystreams#Public'];
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$attr['cc'] = [];
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foreach ($object->getAttentionTargets() as $target) {
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$attr['cc'][] = $target->getUri();
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}
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// Get object or Tombstone
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try {
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$child = $object->getObject(); // Throws NotFoundException
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$prefer_embed = ['Create', 'Undo'];
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$attr['object'] = \in_array($attr['type'], $prefer_embed) ? self::jsonToType(Model::toJson($child)) : ActivityPub::getUriByObject($child);
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} catch (NotFoundException) {
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// It seems this object was deleted, refer to it as a Tombstone
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$uri = match ($object->getObjectType()) {
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'note' => Router::url('note_view', ['id' => $object->getObjectId()], type: Router::ABSOLUTE_URL),
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'actor' => Router::url('actor_view_id', ['id' => $object->getObjectId()], type: Router::ABSOLUTE_URL),
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default => throw new NotImplementedException(),
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};
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$attr['object'] = Type::create('Tombstone', ['id' => $uri]);
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}
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if (!\is_string($attr['object'])) {
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$attr['@context'] = $attr['object']->get('@context');
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$attr['object']->set('@context', null);
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}
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$type = self::jsonToType($attr);
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Event::handle('ActivityPubAddActivityStreamsTwoData', [$type->get('type'), &$type]);
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return $type;
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}
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}
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