gnu-social/plugins/ActivityPub/ActivityPub.php

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<?php
declare(strict_types = 1);
// {{{ License
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
// }}}
/**
* ActivityPub implementation for GNU social
*
* @package GNUsocial
* @category ActivityPub
*
* @author Diogo Peralta Cordeiro <@diogo.site>
* @copyright 2018-2019, 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
namespace Plugin\ActivityPub;
use ActivityPhp\Type;
use ActivityPhp\Type\AbstractObject;
use App\Core\DB;
use App\Core\Event;
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use App\Core\HTTPClient;
use function App\Core\I18n\_m;
use App\Core\Log;
use App\Core\Modules\Plugin;
use App\Core\Queue;
use App\Core\Router;
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use App\Entity\Activity;
use App\Entity\Actor;
use App\Entity\Note;
use App\Util\Common;
use App\Util\Exception\BugFoundException;
use Component\Collection\Util\Controller\OrderedCollection;
use Component\FreeNetwork\Entity\FreeNetworkActorProtocol;
use Component\FreeNetwork\Util\Discovery;
use EventResult;
use Exception;
use InvalidArgumentException;
use Plugin\ActivityPub\Controller\Inbox;
use Plugin\ActivityPub\Controller\Outbox;
use Plugin\ActivityPub\Entity\ActivitypubActivity;
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use Plugin\ActivityPub\Entity\ActivitypubActor;
use Plugin\ActivityPub\Entity\ActivitypubObject;
use Plugin\ActivityPub\Util\Explorer;
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use Plugin\ActivityPub\Util\HTTPSignature;
use Plugin\ActivityPub\Util\Model;
use Plugin\ActivityPub\Util\OrderedCollectionController;
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use Plugin\ActivityPub\Util\Response\ActivityResponse;
use Plugin\ActivityPub\Util\Response\ActorResponse;
use Plugin\ActivityPub\Util\Response\NoteResponse;
use Plugin\ActivityPub\Util\TypeResponse;
use Plugin\ActivityPub\Util\Validator\contentLangModelValidator;
use Plugin\ActivityPub\Util\Validator\manuallyApprovesFollowersModelValidator;
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use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
use Symfony\Contracts\HttpClient\Exception\RedirectionExceptionInterface;
use Symfony\Contracts\HttpClient\Exception\ServerExceptionInterface;
use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
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use Symfony\Contracts\HttpClient\ResponseInterface;
use XML_XRD;
use XML_XRD_Element_Link;
/**
* Adds ActivityPub support to GNU social when enabled
*
* @copyright 2018-2019, 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class ActivityPub extends Plugin
{
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// ActivityStreams 2.0 Accept Headers
public static array $accept_headers = [
'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
'application/activity+json',
'application/json',
'application/ld+json',
];
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// So that this isn't hardcoded everywhere
public const PUBLIC_TO = [
'https://www.w3.org/ns/activitystreams#Public',
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'Public',
'as:Public',
];
public const HTTP_CLIENT_HEADERS = [
'Accept' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
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'User-Agent' => 'GNUsocialBot ' . GNUSOCIAL_VERSION . ' - ' . GNUSOCIAL_PROJECT_URL,
];
public static function version(): string
{
return '3.0.0';
}
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public static array $activity_streams_two_context = [
'https://www.w3.org/ns/activitystreams',
'https://w3id.org/security/v1',
['gs' => 'https://www.gnu.org/software/social/ns#'],
['litepub' => 'http://litepub.social/ns#'],
['chatMessage' => 'litepub:chatMessage'],
[
'inConversation' => [
'@id' => 'gs:inConversation',
'@type' => '@id',
],
],
];
public function onInitializePlugin(): EventResult
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{
Event::handle('ActivityStreamsTwoContext', [&self::$activity_streams_two_context]);
self::$activity_streams_two_context = array_unique(self::$activity_streams_two_context, \SORT_REGULAR);
return Event::next;
}
public function onQueueActivitypubInbox(ActivitypubActor $ap_actor, Actor $actor, string|AbstractObject $type): EventResult
{
// TODO: Check if Actor has authority over payload
// Store Activity
$ap_act = Model\Activity::fromJson($type, ['source' => 'ActivityPub']);
FreeNetworkActorProtocol::protocolSucceeded(
'activitypub',
$ap_actor->getActorId(),
Discovery::normalize($actor->getNickname() . '@' . parse_url($ap_actor->getInboxUri(), \PHP_URL_HOST)),
);
DB::flush();
if (($att_targets = $ap_act->getAttentionTargets()) !== []) {
if (Event::handle('ActivityPubNewNotification', [$actor, ($act = $ap_act->getActivity()), $att_targets, _m('{actor_id} triggered a notification via ActivityPub.', ['{actor_id}' => $actor->getId()])]) === Event::next) {
Event::handle('NewNotification', [$actor, $act, $att_targets, _m('{actor_id} triggered a notification via ActivityPub.', ['{nickname}' => $actor->getId()])]);
}
}
return Event::stop;
}
/**
* This code executes when GNU social creates the page routing, and we hook
* on this event to add our Inbox and Outbox handler for ActivityPub.
*
* @param Router $r the router that was initialized
*/
public function onAddRoute(Router $r): EventResult
{
$r->connect(
'activitypub_inbox',
'/inbox.json',
Inbox::class,
options: ['format' => self::$accept_headers[0]],
);
$r->connect(
'activitypub_actor_inbox',
'/actor/{gsactor_id<\d+>}/inbox.json',
[Inbox::class, 'handle'],
options: ['format' => self::$accept_headers[0]],
);
$r->connect(
'activitypub_actor_outbox',
'/actor/{gsactor_id<\d+>}/outbox.json',
[Outbox::class, 'viewOutboxByActorId'],
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options: ['accept' => self::$accept_headers, 'format' => self::$accept_headers[0]],
);
return Event::next;
}
/**
* Fill Actor->getUrl() calls with correct URL coming from ActivityPub
*/
public function onStartGetActorUri(Actor $actor, int $type, ?string &$url): EventResult
{
if (
// Is remote?
!$actor->getIsLocal()
// Is in ActivityPub?
&& !\is_null($ap_actor = DB::findOneBy(ActivitypubActor::class, ['actor_id' => $actor->getId()], return_null: true))
// We can only provide a full URL (anything else wouldn't make sense)
&& $type === Router::ABSOLUTE_URL
) {
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$url = $ap_actor->getUri();
return Event::stop;
}
return Event::next;
}
/**
* Fill Actor->canAdmin() for Actors that came from ActivityPub
*/
public function onFreeNetworkActorCanAdmin(Actor $actor, Actor $other, bool &$canAdmin): EventResult
{
// Are both in AP?
if (
!\is_null($ap_actor = DB::findOneBy(ActivitypubActor::class, ['actor_id' => $actor->getId()], return_null: true))
&& !\is_null($ap_other = DB::findOneBy(ActivitypubActor::class, ['actor_id' => $other->getId()], return_null: true))
) {
// Are they both in the same server?
$canAdmin = parse_url($ap_actor->getUri(), \PHP_URL_HOST) === parse_url($ap_other->getUri(), \PHP_URL_HOST);
return Event::stop;
}
return Event::next;
}
/**
* Overload core endpoints to make resources available in ActivityStreams 2.0
*
* @throws Exception
*/
public function onControllerResponseInFormat(string $route, array $accept_header, array $vars, ?TypeResponse &$response = null): EventResult
{
if (\count(array_intersect(self::$accept_headers, $accept_header)) === 0) {
return Event::next;
}
switch ($route) {
case 'actor_view_id':
case 'person_actor_view_id':
case 'person_actor_view_nickname':
case 'group_actor_view_id':
case 'group_actor_view_nickname':
case 'bot_actor_view_id':
case 'bot_actor_view_nickname':
$response = ActorResponse::handle($vars['actor']);
break;
case 'activity_view':
$response = ActivityResponse::handle($vars['activity']);
break;
case 'note_view':
$response = NoteResponse::handle($vars['note']);
break;
case 'activitypub_actor_outbox':
$response = new TypeResponse($vars['type']);
break;
default:
if (Event::handle('ActivityPubActivityStreamsTwoResponse', [$route, $vars, &$response]) !== Event::stop) {
if (is_subclass_of($vars['controller'][0], OrderedCollection::class)) {
$response = new TypeResponse(OrderedCollectionController::fromControllerVars($vars)['type']);
} else {
$response = new JsonResponse(['error' => 'Unknown Object cannot be represented.']);
}
}
}
return Event::stop;
}
/**
* Add ActivityStreams 2 Extensions
*/
public function onActivityPubValidateActivityStreamsTwoData(string $type_name, array &$validators): EventResult
{
switch ($type_name) {
case 'Person':
$validators['manuallyApprovesFollowers'] = manuallyApprovesFollowersModelValidator::class;
break;
case 'Note':
$validators['contentLang'] = contentLangModelValidator::class;
break;
}
return Event::next;
}
// FreeNetworkComponent Events
/**
* Let FreeNetwork Component know we exist and which class to use to call the freeNetworkDistribute method
*/
public function onAddFreeNetworkProtocol(array &$protocols): EventResult
{
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$protocols[] = '\Plugin\ActivityPub\ActivityPub';
return Event::next;
}
/**
* The FreeNetwork component will call this function to pull ActivityPub objects by URI
*
* @param string $uri Query
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*
* @return bool true if imported, false otherwise
*/
public static function freeNetworkGrabRemote(string $uri): bool
{
if (Common::isValidHttpUrl($uri)) {
try {
$object = self::getObjectByUri($uri);
if (!\is_null($object)) {
if ($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))) {
DB::wrapInTransaction(fn () => Model\Actor::fromJson($object));
} else {
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DB::wrapInTransaction(fn () => Model\Activity::fromJson($object));
}
}
return true;
}
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} catch (Exception|Throwable) {
// May be invalid input, we can safely ignore in this case
}
}
return false;
}
public function onQueueActivitypubPostman(
Actor $sender,
Activity $activity,
string $inbox,
array $to_actors,
array &$retry_args,
): EventResult {
try {
$data = Model::toType($activity);
if ($sender->isGroup()) { // When the sender is a group,
if ($activity->getVerb() === 'subscribe') {
// Regular postman happens
} elseif ($activity->getVerb() === 'undo' && $data->get('object')->get('type') === 'Follow') {
// Regular postman happens
} else {
// For every other activity sent by a Group, we have to wrap it in a transient Announce activity
$data = Type::create('Announce', [
'@context' => 'https:\/\/www.w3.org\/ns\/activitystreams',
'actor' => $sender->getUri(type: Router::ABSOLUTE_URL),
'object' => $data,
]);
}
}
$res = self::postman($sender, $data->toJson(), $inbox);
// accumulate errors for later use, if needed
$status_code = $res->getStatusCode();
if (!($status_code === 200 || $status_code === 202 || $status_code === 409)) {
$res_body = json_decode($res->getContent(), true);
$retry_args['reason'] ??= [];
$retry_args['reason'][] = $res_body['error'] ?? 'An unknown error occurred.';
return Event::next;
} else {
foreach ($to_actors as $actor) {
if ($actor->isPerson()) {
FreeNetworkActorProtocol::protocolSucceeded(
'activitypub',
$actor,
Discovery::normalize($actor->getNickname() . '@' . parse_url($inbox, \PHP_URL_HOST)),
);
}
}
}
return Event::stop;
} catch (Exception $e) {
Log::error('ActivityPub @ freeNetworkDistribute: ' . $e->getMessage(), [$e]);
$retry_args['reason'] ??= [];
$retry_args['reason'][] = "Got an exception: {$e->getMessage()}";
$retry_args['exception'] ??= [];
$retry_args['exception'][] = $e;
return Event::next;
}
}
/**
* The FreeNetwork component will call this function to distribute this instance's activities
*
* @throws ClientExceptionInterface
* @throws RedirectionExceptionInterface
* @throws ServerExceptionInterface
* @throws TransportExceptionInterface
*/
public static function freeNetworkDistribute(Actor $sender, Activity $activity, array $targets, ?string $reason = null): void
{
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$to_addr = [];
foreach ($targets as $actor) {
if (FreeNetworkActorProtocol::canIActor('activitypub', $actor->getId())) {
// Sometimes FreeNetwork can allow us to actor even though we don't have an internal representation of
// the actor, that could for example mean that OStatus handled this actor while we were deactivated
// On next interaction this should be resolved, for now continue
if (\is_null($ap_target = DB::findOneBy(ActivitypubActor::class, ['actor_id' => $actor->getId()], return_null: true))) {
Log::info('FreeNetwork wrongly told ActivityPub that it can handle actor id: ' . $actor->getId() . ' you might want to keep an eye on it.');
continue;
}
$to_addr[$ap_target->getInboxSharedUri() ?? $ap_target->getInboxUri()][] = $actor;
} else {
continue;
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}
}
foreach ($to_addr as $inbox => $to_actors) {
Queue::enqueue(
payload: [$sender, $activity, $inbox, $to_actors],
queue: 'ActivitypubPostman',
priority: false,
);
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}
}
/**
* Internal tool to sign and send activities out
*
* @throws Exception
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*/
private static function postman(Actor $sender, string $json_activity, string $inbox, string $method = 'post'): ResponseInterface
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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]);
Log::debug('ActivityPub Postman: Delivery result with status code ' . $response->getStatusCode() . ': ' . $response->getContent());
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return $response;
}
// WebFinger Events
/**
* Add activity+json mimetype to WebFinger
*/
public function onEndWebFingerProfileLinks(XML_XRD $xrd, Actor $object): EventResult
{
if ($object->isPerson()) {
$link = new XML_XRD_Element_Link(
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rel: 'self',
href: $object->getUri(Router::ABSOLUTE_URL),//Router::url('actor_view_id', ['id' => $object->getId()], Router::ABSOLUTE_URL),
type: 'application/activity+json',
);
$xrd->links[] = clone $link;
}
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return Event::next;
}
/**
* When FreeNetwork component asks us to help with identifying Actors from XRDs
*/
public function onFreeNetworkFoundXrd(XML_XRD $xrd, ?Actor &$actor = null): EventResult
{
$addr = null;
foreach ($xrd->aliases as $alias) {
if (Discovery::isAcct($alias)) {
$addr = Discovery::normalize($alias);
}
}
if (\is_null($addr)) {
return Event::next;
} else {
if (!FreeNetworkActorProtocol::canIAddr('activitypub', $addr)) {
return Event::next;
}
}
try {
$ap_actor = ActivitypubActor::fromXrd($addr, $xrd);
$actor = Actor::getById($ap_actor->getActorId());
FreeNetworkActorProtocol::protocolSucceeded('activitypub', $actor, $addr);
return Event::stop;
} catch (Exception $e) {
Log::error('ActivityPub Actor from URL Mention check failed: ' . $e->getMessage());
return Event::next;
}
}
// Discovery Events
/**
* When FreeNetwork component asks us to help with identifying Actors from URIs
*/
public function onFreeNetworkFindMentions(string $target, ?Actor &$actor = null): EventResult
{
try {
if (FreeNetworkActorProtocol::canIAddr('activitypub', $addr = Discovery::normalize($target))) {
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$ap_actor = DB::wrapInTransaction(fn () => ActivitypubActor::getByAddr($addr));
$actor = Actor::getById($ap_actor->getActorId());
FreeNetworkActorProtocol::protocolSucceeded('activitypub', $actor->getId(), $addr);
return Event::stop;
} else {
return Event::next;
}
} catch (Exception $e) {
Log::error('ActivityPub WebFinger Mention check failed.', [$e]);
return Event::next;
}
}
/**
* @return string got from URI
*/
public static function getUriByObject(mixed $object): string
{
switch ($object::class) {
case Note::class:
if ($object->getIsLocal()) {
return $object->getUrl();
} else {
// Try known remote objects
$known_object = DB::findOneBy(ActivitypubObject::class, ['object_type' => 'note', 'object_id' => $object->getId()], return_null: true);
if ($known_object instanceof ActivitypubObject) {
return $known_object->getObjectUri();
} else {
throw new BugFoundException('ActivityPub cannot generate an URI for a stored note.', [$object, $known_object]);
}
}
break;
case Actor::class:
return $object->getUri();
break;
case Activity::class:
// Try known remote activities
$known_activity = DB::findOneBy(ActivitypubActivity::class, ['activity_id' => $object->getId()], return_null: true);
if (!\is_null($known_activity)) {
return $known_activity->getActivityUri();
} else {
return Router::url('activity_view', ['id' => $object->getId()], Router::ABSOLUTE_URL);
}
break;
default:
throw new InvalidArgumentException('ActivityPub::getUriByObject found a limitation with: ' . var_export($object, true));
}
}
/**
* Get a Note from ActivityPub URI, if it doesn't exist, attempt to fetch it
* This should only be necessary internally.
*
* @throws ClientExceptionInterface
* @throws RedirectionExceptionInterface
* @throws ServerExceptionInterface
* @throws TransportExceptionInterface
*
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* @return null|Actor|mixed|Note got from URI
*/
public static function getObjectByUri(string $resource, bool $try_online = true): mixed
{
// Try known object
$known_object = DB::findOneBy(ActivitypubObject::class, ['object_uri' => $resource], return_null: true);
if (!\is_null($known_object)) {
return $known_object->getObject();
}
// Try known activity
$known_activity = DB::findOneBy(ActivitypubActivity::class, ['activity_uri' => $resource], return_null: true);
if (!\is_null($known_activity)) {
return $known_activity->getActivity();
}
// Try Actor
try {
return Explorer::getOneFromUri($resource, try_online: false);
} catch (\Exception) {
// Ignore, this is brute forcing, it's okay not to find
}
// Is it a HTTP URL?
if (Common::isValidHttpUrl($resource)) {
$resource_parts = parse_url($resource);
// If it is local
if ($resource_parts['host'] === Common::config('site', 'server')) {
// Try Local Note
$local_note = DB::findOneBy(Note::class, ['url' => $resource], return_null: true);
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if (!\is_null($local_note)) {
return $local_note;
}
// Try local Activity
try {
$match = Router::match($resource_parts['path']);
$local_activity = DB::findOneBy(Activity::class, ['id' => $match['id']], return_null: true);
if (!\is_null($local_activity)) {
return $local_activity;
} else {
throw new InvalidArgumentException('Tried to retrieve a non-existent local activity.');
}
} catch (\Exception) {
// Ignore, this is brute forcing, it's okay not to find
}
throw new BugFoundException('ActivityPub failed to retrieve local resource: "' . $resource . '". This is a big issue.');
} else {
// Then it's remote
if (!$try_online) {
throw new Exception("Remote resource {$resource} not found without online resources.");
}
$response = HTTPClient::get($resource, ['headers' => self::HTTP_CLIENT_HEADERS]);
// If it was deleted
if ($response->getStatusCode() == 410) {
//$obj = Type::create('Tombstone', ['id' => $resource]);
return null;
} elseif (!HTTPClient::statusCodeIsOkay($response)) { // If it is unavailable
throw new Exception('Non Ok Status Code for given Object id.');
} else {
return Model::jsonToType($response->getContent());
}
}
}
return null;
}
}