gnu-social/plugins/ActivityPub/lib/models/Activitypub_undo.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
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*
* @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
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*
* @see http://www.gnu.org/software/social/
*/
defined('GNUSOCIAL') || die();
/**
* ActivityPub error representation
*
* @category Plugin
* @package GNUsocial
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*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
class Activitypub_undo
{
/**
* Generates an ActivityPub representation of a Undo
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
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*
* @param array $object
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*
* @return array pretty array to be used in a response
*/
public static function undo_to_array(array $object): array
{
$res = [
'@context' => 'https://www.w3.org/ns/activitystreams',
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'id' => $object['id'] . '/undo',
'type' => 'Undo',
'actor' => $object['actor'],
'object' => $object,
];
return $res;
}
/**
* Verifies if a given object is acceptable for a Undo Activity.
*
* @param array $object
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*
* @throws Exception
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*
* @return bool
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function validate_object(array $object): bool
{
if (!is_array($object)) {
throw new Exception('Invalid Object Format for Undo Activity.');
}
if (!isset($object['type'])) {
throw new Exception('Object type was not specified for Undo Activity.');
}
switch ($object['type']) {
case 'Follow':
case 'Like':
// Validate data
if (!filter_var($object['object'], FILTER_VALIDATE_URL)) {
throw new Exception('Object is not a valid Object URI for Activity.');
}
break;
default:
throw new Exception('This is not a supported Object Type for Undo Activity.');
}
return true;
}
}