357 lines
13 KiB
PHP
357 lines
13 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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*
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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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*
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* @see 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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*
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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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*
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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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*
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* @return array array to be used in a response
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*
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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 $notice): array
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{
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$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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$item['inReplyTo'] = self::getUri(Notice::getById($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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*
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* @throws Exception
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*
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* @return Notice
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*
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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 $mention) {
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try {
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$mentioned_profile = $discovery->lookup($mention);
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if (!empty($mentioned_profile)) {
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$mentions_profiles[] = $mentioned_profile[0];
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}
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} catch (Exception $e) {
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// Invalid actor found, just let it go, it will eventually be handled by some other federation plugin like OStatus.
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}
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}
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unset($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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// Attachments (first part)
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$attachments = [];
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if (isset($object['attachment']) && is_array($object['attachment'])) {
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foreach ($object['attachment'] as $attachment) {
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if (array_key_exists('type', $attachment)
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&& $attachment['type'] === 'Document'
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&& array_key_exists('url', $attachment)) {
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try {
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// throws exception on failure
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$attachment = MediaFile::fromUrl($attachment['url'], $actor_profile, $attachment['name']);
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$act->enclosures[] = $attachment->getEnclosure();
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$attachments[] = $attachment;
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} catch (Exception $e) {
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// Whatever.
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continue;
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}
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}
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}
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}
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$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, $options);
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// Attachments (last part)
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foreach ($attachments as $attachment) {
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$attachment->attachToNotice($note);
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}
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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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*
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* @throws Exception if invalid ActivityPub object
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*
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* @return bool false if unacceptable for GS but valid ActivityPub object
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*
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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*/
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public static function validate_note(array $object): bool
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{
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if (!isset($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'], $object['cc']))) {
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common_debug('ActivityPub Notice Validator: Rejected because either Object CC or TO wasn\'t specified.');
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throw new Exception('Either Object CC or TO wasn\'t specified.');
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}
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if (!isset($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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*
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* @throws InvalidUrlException
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* @throws Exception
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*
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* @return string URL
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*
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* @author Bruno Casteleiro <brunoccast@fc.up.pt>
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* @see note_uri when it's not a generic activity but a object type note
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*/
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public static function getUri(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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* Use this if your Notice is in fact a note
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*
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* @param int $id
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* @return string it's uri
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* @author Diogo Cordeiro <diogo@fc.up.pt>
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* @see getUri for every other activity that aren't objects of a certain type like note
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*/
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public static function note_uri(int $id): string
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{
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return common_root_url() . 'object/note/' . $id;
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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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*
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* @return int Notice policy type
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*
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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 $actor_profile): int
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{
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$addressee = array_unique(array_merge($note['to'], $note['cc']));
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if (in_array('https://www.w3.org/ns/activitystreams#Public', $addressee)) {
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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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