457 lines
17 KiB
PHP
457 lines
17 KiB
PHP
<?php
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declare(strict_types = 1);
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namespace Plugin\ActivityPub;
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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\Util\Common;
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use App\Util\Exception\NicknameEmptyException;
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use App\Util\Exception\NicknameException;
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use App\Util\Exception\NicknameInvalidException;
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use App\Util\Exception\NicknameNotAllowedException;
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use App\Util\Exception\NicknameTakenException;
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use App\Util\Exception\NicknameTooLongException;
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use App\Util\Exception\NoSuchActorException;
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use App\Util\Nickname;
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use Exception;
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use Plugin\ActivityPub\Controller\Inbox;
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use Plugin\ActivityPub\Entity\ActivitypubActor;
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use Plugin\ActivityPub\Util\Explorer;
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use Plugin\ActivityPub\Util\HTTPSignature;
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use Plugin\ActivityPub\Util\Model\EntityToType\EntityToType;
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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\Response\TypeResponse;
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use Plugin\ActivityPub\Util\Type;
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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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use function count;
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use const PREG_SET_ORDER;
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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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/**
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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, 'handle'],
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options: ['accept' => self::$accept_headers, 'format' => self::$accept_headers[0]],
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);
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$r->connect(
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'activitypub_actor_inbox',
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'/actor/{gsactor_id<\d+>}/inbox.json',
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[Inbox::class, 'handle'],
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options: ['accept' => self::$accept_headers, '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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[Inbox::class, 'handle'],
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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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public function onStartGetActorUrl(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 = ActivitypubActor::getWithPK(['actor_id' => $actor->getId()]))
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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 = $ap_actor->getUri();
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return Event::stop;
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}
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return Event::next;
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}
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public function onAddFreeNetworkProtocol (array &$protocols): bool {
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$protocols[] = '\Plugin\ActivityPub\ActivityPub';
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return Event::next;
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}
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public static function freeNetworkDistribute(Actor $sender, Activity $activity, array $targets, ?string $reason = null): bool
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{
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$to_addr = [];
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foreach($targets as $target) {
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if (is_null($ap_target = ActivitypubActor::getWithPK(['actor_id' => $target->getId()]))) {
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continue;
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}
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$to_addr[$ap_target->getInboxSharedUri() ?? $ap_target->getInboxUri()] = true;
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}
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$errors = [];
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$to_failed = []; // TODO: Implement failed queues
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foreach ($to_addr as $inbox => $dummy) {
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try {
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$res = self::postman($sender, EntityToType::translate($activity), $inbox);
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// accummulate errors for later use, if needed
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$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[] = isset($res_body['error']) ?
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$res_body['error'] : "An unknown error occurred.";
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$to_failed[$inbox] = $activity;
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}
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} catch (Exception $e) {
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Log::error('ActivityPub @ freeNetworkDistribute: ' . $e->getMessage());
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$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 the delete_profile 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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* @param Actor $sender
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* @param Type $activity
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* @param string $inbox
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* @param string $method
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* @return ResponseInterface
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*/
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public static function postman(Actor $sender, mixed $activity, string $inbox, string $method = 'post'): ResponseInterface
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{
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$data = $activity->toJson();
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Log::debug('ActivityPub Postman: Delivering ' . $data . ' to ' . $inbox);
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$headers = HTTPSignature::sign($sender, $inbox, $data);
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Log::debug('ActivityPub Postman: Delivery headers were: ' . print_r($headers, true));
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$response = HTTPClient::$method($inbox, ['headers' => $headers, 'body' => $data]);
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Log::debug('ActivityPub Postman: Delivery result with status code '.$response->getStatusCode().': '.$response->getContent());
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return $response;
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}
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public static function getActorByUri(string $resource, ?bool $attempt_fetch = true): Actor
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{
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// Try local
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if (Common::isValidHttpUrl($resource)) {
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// This means $resource is a valid url
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$resource_parts = parse_url($resource);
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// TODO: Use URLMatcher
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if ($resource_parts['host'] === $_ENV['SOCIAL_DOMAIN']) { // XXX: Common::config('site', 'server')) {
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$str = $resource_parts['path'];
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// actor_view_nickname
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$renick = '/\/@(' . Nickname::DISPLAY_FMT . ')\/?/m';
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// actor_view_id
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$reuri = '/\/actor\/(\d+)\/?/m';
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if (preg_match_all($renick, $str, $matches, PREG_SET_ORDER, 0) === 1) {
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return LocalUser::getWithPK(['nickname' => $matches[0][1]])->getActor();
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} elseif (preg_match_all($reuri, $str, $matches, PREG_SET_ORDER, 0) === 1) {
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return Actor::getById((int) $matches[0][1]);
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}
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}
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}
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// Try remote
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$aprofile = ActivitypubActor::getByAddr($resource);
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if ($aprofile instanceof ActivitypubActor) {
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return Actor::getById($aprofile->getActorId());
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} else {
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throw new NoSuchActorException("From URI: {$resource}");
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}
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}
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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 'actor_view_nickname':
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$response = ActorResponse::handle($vars['actor']);
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return Event::stop;
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case 'note_view':
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$response = NoteResponse::handle($vars['note']);
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return Event::stop;
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/*case 'actor_favourites_id':
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case 'actor_favourites_nickname':
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$response = LikeResponse::handle($vars['actor']);
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return Event::stop;
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case 'actor_subscriptions_id':
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case 'actor_subscriptions_nickname':
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$response = FollowingResponse::handle($vars['actor']);
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return Event::stop;
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case 'actor_subscribers_id':
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case 'actor_subscribers_nickname':
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$response = FollowersResponse::handle($vars['actor']);
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return Event::stop;*/
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default:
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if (Event::handle('ActivityStreamsTwoResponse', [$route, &$response]) == Event::stop) {
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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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/********************************************************
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* WebFinger Events *
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********************************************************/
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/**
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* Add activity+json mimetype on WebFinger
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*
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* @throws Exception
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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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* Webfinger matches: @user@example.com or even @user--one.george_orwell@1984.biz
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*
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* @param string $text The text from which to extract webfinger IDs
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* @param string $preMention Character(s) that signals a mention ('@', '!'...)
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* @return array The matching IDs (without $preMention) and each respective position in the given string.
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*/
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public static function extractWebfingerIds(string $text, string $preMention='@'): array
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{
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$wmatches = [];
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$result = preg_match_all(
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'/'.Nickname::BEFORE_MENTIONS.preg_quote($preMention, '/').'('.Nickname::WEBFINGER_FMT.')/',
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$text,
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$wmatches,
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PREG_OFFSET_CAPTURE
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);
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if ($result === false) {
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Log::error(__METHOD__ . ': Error parsing webfinger IDs from text (preg_last_error=='.preg_last_error().').');
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return [];
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} elseif (($n_matches = count($wmatches)) != 0) {
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Log::debug((sprintf('Found %d matches for WebFinger IDs: %s', $n_matches, print_r($wmatches, true))));
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}
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return $wmatches[1];
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}
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/**
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* Profile URL matches: @example.com/mublog/user
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*
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* @param string $text The text from which to extract URL mentions
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* @param string $preMention Character(s) that signals a mention ('@', '!'...)
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* @return array The matching URLs (without @ or acct:) and each respective position in the given string.
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*/
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public static function extractUrlMentions(string $text, string $preMention='@'): array
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{
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$wmatches = [];
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// In the regexp below we need to match / _before_ URL_REGEX_VALID_PATH_CHARS because it otherwise gets merged
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// with the TLD before (but / is in URL_REGEX_VALID_PATH_CHARS anyway, it's just its positioning that is important)
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$result = preg_match_all(
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'/(?:^|\s+)'.preg_quote($preMention, '/').'('.URL_REGEX_DOMAIN_NAME.'(?:\/['.URL_REGEX_VALID_PATH_CHARS.']*)*)/',
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$text,
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$wmatches,
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PREG_OFFSET_CAPTURE
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);
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if ($result === false) {
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Log::error(__METHOD__ . ': Error parsing profile URL mentions from text (preg_last_error=='.preg_last_error().').');
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return [];
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} elseif (count($wmatches)) {
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Log::debug((sprintf('Found %d matches for profile URL mentions: %s', count($wmatches), print_r($wmatches, true))));
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}
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return $wmatches[1];
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}
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/**
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* Find any explicit remote mentions. Accepted forms:
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* Webfinger: @user@example.com
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* Profile link: @example.com/mublog/user
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* @param Actor $sender
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* @param string $text input markup text
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* @param $mentions
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* @return bool hook return value
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*/
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public function onEndFindMentions(Actor $sender, string $text, array &$mentions): bool
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{
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$matches = [];
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foreach (self::extractWebfingerIds($text, '@') as $wmatch) {
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list($target, $pos) = $wmatch;
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Log::info("Checking webfinger person '$target'");
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$profile = null;
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try {
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$aprofile = ActivitypubActor::getByAddr($target);
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$profile = Actor::getById($aprofile->getActorId());
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} catch (Exception $e) {
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Log::error("Webfinger check failed: " . $e->getMessage());
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continue;
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}
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assert($profile instanceof Actor);
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$displayName = $profile->getFullname() ?? $profile->getNickname() ?? $target; // TODO: we could do getBestName() or getFullname() here
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$matches[$pos] = [
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'mentioned' => [$profile],
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'type' => 'mention',
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'text' => $displayName,
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'position' => $pos,
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'length' => mb_strlen($target),
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'url' => $aprofile->getUri()
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];
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}
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foreach (self::extractUrlMentions($text) as $wmatch) {
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list($target, $pos) = $wmatch;
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$schemes = array('https', 'http');
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foreach ($schemes as $scheme) {
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$url = "$scheme://$target";
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Log::info("Checking profile address '$url'");
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try {
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$aprofile = ActivitypubActor::fromUri($url);
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$profile = Actor::getById($aprofile->getActorId());
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$displayName = $profile->getFullname() ?? $profile->getNickname() ?? $target; // TODO: we could do getBestName() or getFullname() here
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$matches[$pos] = ['mentioned' => [$profile],
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'type' => 'mention',
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'text' => $displayName,
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'position' => $pos,
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'length' => mb_strlen($target),
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'url' => $aprofile->getUri()
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];
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break;
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} catch (Exception $e) {
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Log::error("Profile check failed: " . $e->getMessage());
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}
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}
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}
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foreach ($mentions as $i => $other) {
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// If we share a common prefix with a local user, override it!
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$pos = $other['position'];
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if (isset($matches[$pos])) {
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$mentions[$i] = $matches[$pos];
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unset($matches[$pos]);
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}
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}
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foreach ($matches as $mention) {
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$mentions[] = $mention;
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}
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return Event::next;
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}
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/**
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* Allow remote profile references to be used in commands:
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* sub update@status.net
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* whois evan@identi.ca
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* reply http://identi.ca/evan hey what's up
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*
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* @param Command $command
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* @param string $arg
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* @param Actor &$profile
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* @return bool hook return code
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* @author GNU social
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*/
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//public function onStartCommandGetProfile($command, $arg, &$profile)
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//{
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// $aprofile = ActivitypubActor::fromUri($arg);
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// if (!($aprofile instanceof ActivitypubActor)) {
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// // No remote ActivityPub profile found
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// return Event::next;
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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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* Discovery Events *
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********************************************************/
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/**
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* Profile from URI.
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*
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* @author GNU social
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* @param string $uri
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* @param Actor &$profile in/out param: Profile got from URI
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* @return mixed hook return code
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*/
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//public function onStartGetProfileFromURI($uri, &$profile)
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//{
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// try {
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// $profile = Explorer::get_profile_from_url($uri);
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// return Event::stop;
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// } catch (Exception) {
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// return Event::next; // It's not an ActivityPub profile as far as we know, continue event handling
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// }
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//}
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/**
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* Try to grab and store the remote profile by the given uri
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*
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* @param string $uri
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* @param Actor|null &$profile
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* @return bool
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*/
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//public function onRemoteFollowPullProfile(string $uri, ?Actor &$profile): bool
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//{
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// $aprofile = ActivitypubActor::fromUri($uri);
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// if (!($aprofile instanceof ActivitypubActor)) {
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// // No remote ActivityPub profile found
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// return Event::next;
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// }
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//
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// return is_null($profile) ? Event::next : Event::stop;
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//}
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}
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