gnu-social/plugins/ActivityPub/classes/Activitypub_notice.php

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<?php
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
/**
* ActivityPub implementation for GNU social
*
* @package GNUsocial
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @copyright 2018-2019 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
* @link http://www.gnu.org/software/social/
*/
defined('GNUSOCIAL') || die();
/**
* ActivityPub notice representation
*
* @category Plugin
* @package GNUsocial
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class Activitypub_notice extends Managed_DataObject
{
/**
* Generates a pretty notice from a Notice object
*
* @param Notice $notice
* @return array array to be used in a response
* @throws EmptyPkeyValueException
* @throws InvalidUrlException
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function notice_to_array($notice)
{
$profile = $notice->getProfile();
$attachments = [];
foreach ($notice->attachments() as $attachment) {
$attachments[] = Activitypub_attachment::attachment_to_array($attachment);
}
$tags = [];
foreach ($notice->getTags() as $tag) {
if ($tag != "") { // Hacky workaround to avoid stupid outputs
$tags[] = Activitypub_tag::tag_to_array($tag);
}
}
$cc = [common_local_url('apActorFollowers', ['id' => $profile->getID()])];
foreach ($notice->getAttentionProfiles() as $to_profile) {
$cc[] = $href = $to_profile->getUri();
$tags[] = Activitypub_mention_tag::mention_tag_to_array_from_values($href, $to_profile->getNickname().'@'.parse_url($href, PHP_URL_HOST));
}
// In a world without walls and fences, we should make everything Public!
$to[]= 'https://www.w3.org/ns/activitystreams#Public';
$item = [
'@context' => 'https://www.w3.org/ns/activitystreams',
'id' => self::getUrl($notice),
'type' => 'Note',
'published' => str_replace(' ', 'T', $notice->getCreated()).'Z',
'url' => self::getUrl($notice),
'attributedTo' => ActivityPubPlugin::actor_uri($profile),
'to' => $to,
'cc' => $cc,
'conversation' => $notice->getConversationUrl(),
'content' => $notice->getRendered(),
'isLocal' => $notice->isLocal(),
'attachment' => $attachments,
'tag' => $tags
];
// Is this a reply?
if (!empty($notice->reply_to)) {
$item['inReplyTo'] = self::getUrl(Notice::getById($notice->reply_to));
}
// Do we have a location for this notice?
try {
$location = Notice_location::locFromStored($notice);
$item['latitude'] = $location->lat;
$item['longitude'] = $location->lon;
} catch (Exception $e) {
// Apparently no.
}
return $item;
}
/**
* Create a Notice via ActivityPub Note Object.
* Returns created Notice.
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param array $object
* @param Profile|null $actor_profile
* @return Notice
* @throws Exception
*/
public static function create_notice($object, $actor_profile = null)
{
$id = $object['id']; // int
$url = isset($object['url']) ? $object['url'] : $id; // string
$content = $object['content']; // string
// possible keys: ['inReplyTo', 'latitude', 'longitude']
$settings = [];
if (isset($object['inReplyTo'])) {
$settings['inReplyTo'] = $object['inReplyTo'];
}
if (isset($object['latitude'])) {
$settings['latitude'] = $object['latitude'];
}
if (isset($object['longitude'])) {
$settings['longitude'] = $object['longitude'];
}
// Ensure Actor Profile
if (is_null($actor_profile)) {
$actor_profile = ActivityPub_explorer::get_profile_from_url($object['attributedTo']);
}
$act = new Activity();
$act->verb = ActivityVerb::POST;
$act->time = time();
$act->actor = $actor_profile->asActivityObject();
$act->context = new ActivityContext();
$options = ['source' => 'ActivityPub', 'uri' => $id, 'url' => $url];
// Is this a reply?
if (isset($settings['inReplyTo'])) {
try {
$inReplyTo = ActivityPubPlugin::grab_notice_from_url($settings['inReplyTo']);
$act->context->replyToID = $inReplyTo->getUri();
$act->context->replyToUrl = $inReplyTo->getUrl();
} catch (Exception $e) {
// It failed to grab, maybe we got this note from another source
// (e.g.: OStatus) that handles this differently or we really
// failed to get it...
// Welp, nothing that we can do about, let's
// just fake we don't have such notice.
}
} else {
$inReplyTo = null;
}
// Mentions
$mentions = [];
if (isset($object['tag']) && is_array($object['tag'])) {
foreach ($object['tag'] as $tag) {
if ($tag['type'] == 'Mention') {
$mentions[] = $tag['href'];
}
}
}
$mentions_profiles = [];
$discovery = new Activitypub_explorer;
foreach ($mentions as $mention) {
try {
$mentions_profiles[] = $discovery->lookup($mention)[0];
} catch (Exception $e) {
// Invalid actor found, just let it go. // TODO: Fallback to OStatus
}
}
unset($discovery);
foreach ($mentions_profiles as $mp) {
$act->context->attention[ActivityPubPlugin::actor_uri($mp)] = 'http://activitystrea.ms/schema/1.0/person';
}
// Add location if that is set
if (isset($settings['latitude'], $settings['longitude'])) {
$act->context->location = Location::fromLatLon($settings['latitude'], $settings['longitude']);
}
/* Reject notice if it is too long (without the HTML)
if (Notice::contentTooLong($content)) {
throw new Exception('That\'s too long. Maximum notice size is %d character.');
}*/
$actobj = new ActivityObject();
$actobj->type = ActivityObject::NOTE;
$actobj->content = strip_tags($content, '<p><b><i><u><a><ul><ol><li>');
// Finally add the activity object to our activity
$act->objects[] = $actobj;
$note = Notice::saveActivity($act, $actor_profile, $options);
return $note;
}
/**
* Validates a note.
*
* @param array $object
* @return bool
* @throws Exception
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function validate_note($object)
{
if (!isset($object['attributedTo'])) {
common_debug('ActivityPub Notice Validator: Rejected because attributedTo was not specified.');
throw new Exception('No attributedTo specified.');
}
if (!isset($object['id'])) {
common_debug('ActivityPub Notice Validator: Rejected because Object ID was not specified.');
throw new Exception('Object ID not specified.');
} elseif (!filter_var($object['id'], FILTER_VALIDATE_URL)) {
common_debug('ActivityPub Notice Validator: Rejected because Object ID is invalid.');
throw new Exception('Invalid Object ID.');
}
if (!isset($object['type']) || $object['type'] !== 'Note') {
common_debug('ActivityPub Notice Validator: Rejected because of Type.');
throw new Exception('Invalid Object type.');
}
if (!isset($object['content'])) {
common_debug('ActivityPub Notice Validator: Rejected because Content was not specified.');
throw new Exception('Object content was not specified.');
}
if (isset($object['url']) && !filter_var($object['url'], FILTER_VALIDATE_URL)) {
common_debug('ActivityPub Notice Validator: Rejected because Object URL is invalid.');
throw new Exception('Invalid Object URL.');
}
if (!isset($object['cc'])) {
common_debug('ActivityPub Notice Validator: Rejected because Object CC was not specified.');
throw new Exception('Object CC was not specified.');
}
return true;
}
/**
* Get the original representation URL of a given notice.
*
* @param Notice $notice notice from which to retrieve the URL
* @return string URL
* @author Bruno Casteleiro <brunoccast@fc.up.pt>
*/
public static function getUrl(Notice $notice): string {
if ($notice->isLocal()) {
return common_local_url('apNotice', ['id' => $notice->getID()]);
} else {
return $notice->getUrl();
}
}
}