gnu-social/plugins/ActivityPub/lib/models/Activitypub_create.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 error 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_create
{
/**
* Generates an ActivityPub representation of a Create
*
* @param string $actor
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* @param string $uri
* @param mixed $object
* @param bool $directMessage whether it is a private Create activity or not
* @return array pretty array to be used in a response
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
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public static function create_to_array(string $actor, string $uri, $object, bool $directMessage = false): array
{
$res = [
'@context' => 'https://www.w3.org/ns/activitystreams',
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'id' => $uri,
'type' => 'Create',
'directMessage' => $directMessage,
'to' => $object['to'],
'cc' => $object['cc'],
'actor' => $actor,
'object' => $object
];
return $res;
}
/**
* Verifies if a given object is acceptable for a Create Activity.
*
* @param array $object
* @return bool True if acceptable, false if valid but unsupported
* @throws Exception if invalid
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function validate_object($object): bool
{
if (!is_array($object)) {
common_debug('ActivityPub Create Validator: Rejected because of invalid Object format.');
throw new Exception('Invalid Object Format for Create Activity.');
}
if (!isset($object['type'])) {
common_debug('ActivityPub Create Validator: Rejected because of Type.');
throw new Exception('Object type was not specified for Create Activity.');
}
if (isset($object['directMessage']) && !is_bool($object['directMessage'])) {
common_debug('ActivityPub Create Validator: Rejected because Object directMessage is invalid.');
throw new Exception('Invalid Object directMessage.');
}
switch ($object['type']) {
case 'Note':
// Validate data
return Activitypub_notice::validate_note($object);
break;
default:
throw new Exception('This is not a supported Object Type for Create Activity.');
}
return true;
}
/**
* Verify if received note is private (direct).
* Note that we're conformant with the (yet) non-standard directMessage attribute:
* https://github.com/w3c/activitypub/issues/196#issuecomment-304958984
*
* @param array $activity received Create-Note activity
* @return bool true if note is private, false otherwise
* @author Bruno casteleiro <brunoccast@fc.up.pt>
*/
public static function isPrivateNote(array $activity): bool
{
if (isset($activity['directMessage'])) {
return $activity['directMessage'];
}
return empty($activity['cc']) && !in_array('https://www.w3.org/ns/activitystreams#Public', $activity['to']);
}
}