176 lines
7.0 KiB
PHP
176 lines
7.0 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\Controller;
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use App\Core\Controller;
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use App\Core\DB\DB;
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use App\Core\Event;
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use function App\Core\I18n\_m;
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use App\Core\Log;
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use App\Core\Router\Router;
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use App\Entity\Actor;
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use App\Util\Exception\ClientException;
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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 const PHP_URL_HOST;
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use Plugin\ActivityPub\Entity\ActivitypubActor;
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use Plugin\ActivityPub\Entity\ActivitypubRsa;
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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;
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use Plugin\ActivityPub\Util\TypeResponse;
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/**
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* ActivityPub Inbox Handler
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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 Inbox extends Controller
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{
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/**
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* Create an Inbox Handler to receive something from someone.
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*/
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public function handle(?int $gsactor_id = null): TypeResponse
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{
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$error = function (string $m, ?Exception $e = null): TypeResponse {
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Log::error('ActivityPub Error Answer: ' . ($json = json_encode(['error' => $m, 'exception' => var_export($e, true)])));
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return new TypeResponse($json, 400);
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};
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$path = Router::url('activitypub_inbox', type: Router::ABSOLUTE_PATH);
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if (!\is_null($gsactor_id)) {
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try {
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$user = DB::findOneBy('local_user', ['id' => $gsactor_id]);
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$path = Router::url('activitypub_actor_inbox', ['gsactor_id' => $user->getId()], type: Router::ABSOLUTE_PATH);
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} catch (Exception $e) {
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throw new ClientException(_m('No such actor.'), 404, $e);
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}
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}
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Log::debug('ActivityPub Inbox: Received a POST request.');
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$body = (string) $this->request->getContent();
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Log::debug('ActivityPub Inbox: Request Body content: ' . $body);
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$type = Model::jsonToType($body);
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if ($type->has('actor') === false) {
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return $error('Actor not found in the request.');
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}
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try {
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$resource_parts = parse_url($type->get('actor'));
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if ($resource_parts['host'] !== $_ENV['SOCIAL_DOMAIN']) { // XXX: Common::config('site', 'server')) {
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$ap_actor = ActivitypubActor::fromUri($type->get('actor'));
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$actor = Actor::getById($ap_actor->getActorId());
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DB::flush();
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} else {
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throw new Exception('Only remote actors can use this endpoint.');
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}
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unset($resource_parts);
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} catch (Exception $e) {
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return $error('Invalid actor.', $e);
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}
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$activitypub_rsa = ActivitypubRsa::getByActor($actor);
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$actor_public_key = $activitypub_rsa->getPublicKey();
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$headers = $this->request->headers->all();
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Log::debug('ActivityPub Inbox: Request Headers: ' . var_export($headers, true));
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// Flattify headers
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foreach ($headers as $key => $val) {
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$headers[$key] = $val[0];
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}
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if (!isset($headers['signature'])) {
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Log::debug('ActivityPub Inbox: HTTP Signature: Missing Signature header.');
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return $error('Missing Signature header.');
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// TODO: support other methods beyond HTTP Signatures
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}
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// Extract the signature properties
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$signatureData = HTTPSignature::parseSignatureHeader($headers['signature']);
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Log::debug('ActivityPub Inbox: HTTP Signature Data: ' . print_r($signatureData, true));
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if (isset($signatureData['error'])) {
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Log::debug('ActivityPub Inbox: HTTP Signature: ' . json_encode($signatureData, \JSON_PRETTY_PRINT));
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return $error(json_encode($signatureData, \JSON_PRETTY_PRINT));
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}
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[$verified, /*$headers*/] = HTTPSignature::verify($actor_public_key, $signatureData, $headers, $path, $body);
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// If the signature fails verification the first time, update profile as it might have changed public key
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if ($verified !== 1) {
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try {
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$res = Explorer::get_remote_user_activity($ap_actor->getUri());
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if (\is_null($res)) {
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return $error('Invalid remote actor (null response).');
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}
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} catch (Exception $e) {
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return $error('Invalid remote actor.', $e);
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}
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try {
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ActivitypubActor::update_profile($ap_actor, $actor, $activitypub_rsa, $res);
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} catch (Exception $e) {
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return $error('Failed to updated remote actor information.', $e);
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}
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[$verified, /*$headers*/] = HTTPSignature::verify($actor_public_key, $signatureData, $headers, $path, $body);
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}
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// If it still failed despite profile update
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if ($verified !== 1) {
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Log::debug('ActivityPub Inbox: HTTP Signature: Invalid signature.');
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return $error('Invalid signature.');
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}
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// HTTP signature checked out, make sure the "actor" of the activity matches that of the signature
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Log::debug('ActivityPub Inbox: HTTP Signature: Authorised request. Will now start the inbox handler.');
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// TODO: Check if Actor has authority over payload
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// Store Activity
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$ap_act = Model\Activity::fromJson($type, ['source' => 'ActivityPub']);
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FreeNetworkActorProtocol::protocolSucceeded(
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'activitypub',
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$ap_actor->getActorId(),
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Discovery::normalize($actor->getNickname() . '@' . parse_url($ap_actor->getInboxUri(), PHP_URL_HOST)),
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);
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Event::handle('NewNotification', [$actor, $ap_act->getActivity(), [], _m('{nickname} mentioned you.', ['{nickname}' => $actor->getNickname()])]);
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DB::flush();
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dd($ap_act, $act = $ap_act->getActivity(), $act->getActor(), $act->getObject());
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return new TypeResponse($type, status: 202);
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}
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}
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