64108aa51d
There was no checking of attributedTo, actors and referent object IDs to make sure they exist in the same domain. Therefore, one could spoof messages from people by doing attributedTo: whoever-i-want-to-spoof
298 lines
11 KiB
PHP
298 lines
11 KiB
PHP
<?php
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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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* ActivityPub implementation for GNU social
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*
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* @package GNUsocial
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @copyright 2018-2019 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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* @link http://www.gnu.org/software/social/
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*/
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defined('GNUSOCIAL') || die();
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/**
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* ActivityPub notice representation
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*
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* @category Plugin
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* @package GNUsocial
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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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_notice
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{
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/**
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* Generates a pretty notice from a Notice object
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*
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* @param Notice $notice
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* @return array array to be used in a response
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* @throws EmptyPkeyValueException
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* @throws InvalidUrlException
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* @throws ServerException
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function notice_to_array($notice)
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{
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$profile = $notice->getProfile();
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$attachments = [];
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foreach ($notice->attachments() as $attachment) {
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$attachments[] = Activitypub_attachment::attachment_to_array($attachment);
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}
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$tags = [];
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foreach ($notice->getTags() as $tag) {
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if ($tag != "") { // Hacky workaround to avoid stupid outputs
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$tags[] = Activitypub_tag::tag_to_array($tag);
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}
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}
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if ($notice->isPublic()) {
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$to = ['https://www.w3.org/ns/activitystreams#Public'];
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$cc = [common_local_url('apActorFollowers', ['id' => $profile->getID()])];
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} else {
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// Since we currently don't support sending unlisted/followers-only
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// notices, arriving here means we're instead answering to that type
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// of posts. Not having subscription policy working, its safer to
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// always send answers of type unlisted.
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$to = [];
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$cc = ['https://www.w3.org/ns/activitystreams#Public'];
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}
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foreach ($notice->getAttentionProfiles() as $to_profile) {
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$to[] = $href = $to_profile->getUri();
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$tags[] = Activitypub_mention_tag::mention_tag_to_array_from_values($href, $to_profile->getNickname() . '@' . parse_url($href, PHP_URL_HOST));
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}
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$item = [
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'@context' => 'https://www.w3.org/ns/activitystreams',
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'id' => self::getUrl($notice),
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'type' => 'Note',
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'published' => str_replace(' ', 'T', $notice->getCreated()) . 'Z',
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'url' => self::getUrl($notice),
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'attributedTo' => $profile->getUri(),
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'to' => $to,
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'cc' => $cc,
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'conversation' => $notice->getConversationUrl(),
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'content' => $notice->getRendered(),
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'isLocal' => $notice->isLocal(),
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'attachment' => $attachments,
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'tag' => $tags
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];
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// Is this a reply?
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if (!empty($notice->reply_to)) {
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$item['inReplyTo'] = self::getUrl(Notice::getById($notice->reply_to));
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}
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// Do we have a location for this notice?
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try {
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$location = Notice_location::locFromStored($notice);
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$item['latitude'] = $location->lat;
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$item['longitude'] = $location->lon;
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} catch (Exception $e) {
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// Apparently no.
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}
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return $item;
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}
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/**
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* Create a Notice via ActivityPub Note Object.
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* Returns created Notice.
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*
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* @param array $object
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* @param Profile $actor_profile
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* @param bool $directMessage
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* @return Notice
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* @throws Exception
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function create_notice(array $object, Profile $actor_profile, bool $directMessage = false): Notice
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{
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$id = $object['id']; // int
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$url = isset($object['url']) ? $object['url'] : $id; // string
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$content = $object['content']; // string
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// possible keys: ['inReplyTo', 'latitude', 'longitude']
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$settings = [];
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if (isset($object['inReplyTo'])) {
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$settings['inReplyTo'] = $object['inReplyTo'];
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}
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if (isset($object['latitude'])) {
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$settings['latitude'] = $object['latitude'];
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}
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if (isset($object['longitude'])) {
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$settings['longitude'] = $object['longitude'];
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}
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$act = new Activity();
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$act->verb = ActivityVerb::POST;
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$act->time = time();
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$act->actor = $actor_profile->asActivityObject();
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$act->context = new ActivityContext();
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$options = ['source' => 'ActivityPub',
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'uri' => $id,
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'url' => $url,
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'is_local' => self::getNotePolicyType($object, $actor_profile)];
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if ($directMessage) {
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$options['scope'] = Notice::MESSAGE_SCOPE;
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}
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// Is this a reply?
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if (isset($settings['inReplyTo'])) {
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try {
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$inReplyTo = ActivityPubPlugin::grab_notice_from_url($settings['inReplyTo']);
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$act->context->replyToID = $inReplyTo->getUri();
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$act->context->replyToUrl = $inReplyTo->getUrl();
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} catch (Exception $e) {
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// It failed to grab, maybe we got this note from another source
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// (e.g.: OStatus) that handles this differently or we really
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// failed to get it...
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// Welp, nothing that we can do about, let's
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// just fake we don't have such notice.
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}
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} else {
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$inReplyTo = null;
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}
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// Mentions
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$mentions = [];
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if (isset($object['tag']) && is_array($object['tag'])) {
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foreach ($object['tag'] as $tag) {
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if (array_key_exists('type', $tag) && $tag['type'] == 'Mention') {
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$mentions[] = $tag['href'];
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}
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}
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}
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$mentions_profiles = [];
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$discovery = new Activitypub_explorer;
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foreach ($mentions as $mention) {
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try {
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$mentions_profiles[] = $discovery->lookup($mention)[0];
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} catch (Exception $e) {
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// Invalid actor found, just let it go. // TODO: Fallback to OStatus
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}
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}
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unset($discovery);
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foreach ($mentions_profiles as $mp) {
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if (!$mp->hasBlocked($actor_profile)) {
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$act->context->attention[$mp->getUri()] = 'http://activitystrea.ms/schema/1.0/person';
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}
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}
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// Add location if that is set
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if (isset($settings['latitude'], $settings['longitude'])) {
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$act->context->location = Location::fromLatLon($settings['latitude'], $settings['longitude']);
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}
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/* Reject notice if it is too long (without the HTML)
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if (Notice::contentTooLong($content)) {
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throw new Exception('That\'s too long. Maximum notice size is %d character.');
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}*/
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$actobj = new ActivityObject();
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$actobj->type = ActivityObject::NOTE;
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$actobj->content = strip_tags($content, '<p><b><i><u><a><ul><ol><li>');
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// Finally add the activity object to our activity
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$act->objects[] = $actobj;
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$note = Notice::saveActivity($act, $actor_profile, $options);
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return $note;
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}
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/**
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* Validates a note.
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*
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* @param array $object
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* @return bool false if unacceptable for GS but valid ActivityPub object
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* @throws Exception if invalid ActivityPub object
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function validate_note($object)
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{
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if (!isset($object['id'])) {
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common_debug('ActivityPub Notice Validator: Rejected because Object ID was not specified.');
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throw new Exception('Object ID not specified.');
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} elseif (!filter_var($object['id'], FILTER_VALIDATE_URL)) {
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common_debug('ActivityPub Notice Validator: Rejected because Object ID is invalid.');
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throw new Exception('Invalid Object ID.');
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}
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if (!isset($object['type']) || $object['type'] !== 'Note') {
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common_debug('ActivityPub Notice Validator: Rejected because of Type.');
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throw new Exception('Invalid Object type.');
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}
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if (isset($object['url']) && !filter_var($object['url'], FILTER_VALIDATE_URL)) {
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common_debug('ActivityPub Notice Validator: Rejected because Object URL is invalid.');
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throw new Exception('Invalid Object URL.');
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}
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if (!(isset($object['to']) && isset($object['cc']))) {
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common_debug('ActivityPub Notice Validator: Rejected because either Object CC or TO wasn\'t specified.');
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throw new Exception('Either Object CC or TO wasn\'t specified.');
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}
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if (!isset($object['content'])) {
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common_debug('ActivityPub Notice Validator: Rejected because Content was not specified (GNU social requires content in notes).');
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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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* Get the original representation URL of a given notice.
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*
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* @param Notice $notice notice from which to retrieve the URL
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* @return string URL
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* @throws InvalidUrlException
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* @throws Exception
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* @author Bruno Casteleiro <brunoccast@fc.up.pt>
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*/
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public static function getUrl(Notice $notice): string
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{
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if ($notice->isLocal()) {
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return common_local_url('apNotice', ['id' => $notice->getID()]);
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} else {
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return $notice->getUrl();
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}
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}
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/**
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* Extract note policy type from note targets.
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*
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* @param array $note received Note
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* @param Profile $actor_profile Note author
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* @return int Notice policy type
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* @author Bruno Casteleiro <brunoccast@fc.up.pt>
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*/
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public static function getNotePolicyType(array $note, Profile $actor_profile): int
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{
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if (in_array('https://www.w3.org/ns/activitystreams#Public', $note['to'])) {
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return $actor_profile->isLocal() ? Notice::LOCAL_PUBLIC : Notice::REMOTE;
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} else {
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// either an unlisted or followers-only note, we'll handle
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// both as a GATEWAY notice since this type is not visible
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// from the public timelines, hence partially enough while
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// we don't have subscription_policy working.
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return Notice::GATEWAY;
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}
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}
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}
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