gnu-social/plugins/ActivityPub/Util/Model.php

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<?php
declare(strict_types=1);
// {{{ License
// 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
* @category ActivityPub
* @author Diogo Peralta Cordeiro <@diogo.site>
* @copyright 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
namespace Plugin\ActivityPub\Util;
use ActivityPhp\Type;
use ActivityPhp\Type\TypeConfiguration;
use ActivityPhp\Type\TypeResolver;
use App\Core\Entity;
use App\Core\Event;
use App\Util\Exception\ClientException;
use Exception;
use InvalidArgumentException;
use Plugin\ActivityPub\Util\Model\Activity;
use Plugin\ActivityPub\Util\Model\Note;
/**
* This class handles translation between JSON and GS Entities
*
* @copyright 2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
abstract class Model
{
/**
* Create a Type from an ActivityStreams 2.0 JSON string
*
* @param string|array $data
* @return Type\AbstractObject
* @throws Exception
*/
public static function jsonToType(string|array $data): Type\AbstractObject
{
if (is_string($data)) {
$attributes = json_decode($data, true);
if (json_last_error() !== JSON_ERROR_NONE
|| !is_array($attributes)
) {
throw new Exception(
sprintf(
"An error occurred during the JSON decoding.\n '%s'",
$data
)
);
}
} else {
$attributes = $data;
}
if (!array_key_exists('type', $attributes)) {
throw new InvalidArgumentException('Missing "type" attribute in $data: ' . var_export($data, true));
}
unset($data);
try {
$type = TypeResolver::getClass($attributes['type']);
} catch (Exception $e) {
$message = json_encode($attributes, JSON_PRETTY_PRINT);
throw new Exception(
$e->getMessage() . "\n$message"
);
}
if (is_string($type)) {
$type = new $type();
}
// Add our own extensions
$validators = [];
if (Event::handle('ActivityPubValidateActivityStreamsTwoData', [$attributes['type'], &$validators]) === Event::next) {
foreach ($validators as $name => $class) {
Type::addValidator($name, $class);
$type->extend($name);
}
}
TypeConfiguration::set('undefined_properties', 'include');
foreach ($attributes as $name => $value) {
$type->set($name, $value);
}
return $type;
}
/**
* Create an Entity from an ActivityStreams 2.0 JSON string
*
* @param string|Type\AbstractObject $json
* @param array $options
* @return Entity
*/
abstract public static function fromJson(string|Type\AbstractObject $json, array $options = []): Entity;
/**
* Get a JSON
*
* @param mixed $object
* @param ?int $options PHP JSON options
* @return string
* @throws ClientException
*/
public static function toJson(mixed $object, int $options = null): string
{
switch ($object::class) {
case 'App\Entity\Activity':
return Activity::toJson($object, $options);
case 'App\Entity\Note':
return Note::toJson($object, $options);
default:
$type = self::jsonToType($object);
Event::handle('ActivityPubAddActivityStreamsTwoData', [$type->get('type'), &$type]);
return $type->toJson($options);
}
}
}