gnu-social/plugins/ActivityPub/lib/models/Activitypub_follow.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_follow
{
/**
* Generates an ActivityPub representation of a subscription
*
* @author Diogo Cordeiro <diogo@fc.up.pt>
* @param string $actor
* @param string $object
* @param string|null $id Activity id, to be used when generating for an Accept Activity
* @return array pretty array to be used in a response
*/
public static function follow_to_array(string $actor, string $object, ?string $id = null): array
{
if ($id === null) {
$id = common_root_url().'follow_from_'.urlencode($actor).'_to_'.urlencode($object);
}
$res = [
'@context' => 'https://www.w3.org/ns/activitystreams',
'id' => $id,
'type' => 'Follow',
'actor' => $actor,
'object' => $object
];
return $res;
}
/**
* Handles a Follow Activity received by our inbox.
*
* @param Profile $actor_profile Remote Actor
* @param string $object Local Actor
* @param string $id Activity id
* @throws AlreadyFulfilledException
* @throws HTTP_Request2_Exception
* @throws NoProfileException
* @throws ServerException
* @author Diogo Cordeiro <diogo@fc.up.pt>
*/
public static function follow(Profile $actor_profile, string $object, string $id)
{
// Get Actor's Aprofile
$actor_aprofile = Activitypub_profile::from_profile($actor_profile);
// Get Object profile
$object_profile = new Activitypub_explorer;
$object_profile = $object_profile->lookup($object)[0];
if (!Subscription::exists($actor_profile, $object_profile)) {
Subscription::start($actor_profile, $object_profile);
Activitypub_profile::subscribeCacheUpdate($actor_profile, $object_profile);
common_debug('ActivityPubPlugin: Accepted Follow request from '.ActivityPubPlugin::actor_uri($actor_profile).' to '.$object);
} else {
common_debug('ActivityPubPlugin: Received a repeated Follow request from '.ActivityPubPlugin::actor_uri($actor_profile).' to '.$object);
}
// Notify remote instance that we have accepted their request
common_debug('ActivityPubPlugin: Notifying remote instance that we have accepted their Follow request request from '.ActivityPubPlugin::actor_uri($actor_profile).' to '.$object);
$postman = new Activitypub_postman($object_profile, [$actor_aprofile]);
$postman->accept_follow($id);
}
}