gnu-social/components/Subscription/Subscription.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/>.
// }}}
namespace Component\Subscription;
use App\Core\DB\DB;
use App\Core\Event;
use function App\Core\I18n\_m;
use App\Core\Modules\Component;
use App\Entity\Activity;
use App\Entity\Actor;
use App\Entity\LocalUser;
use App\Util\Exception\ServerException;
class Subscription extends Component
{
/**
* Persists a new Subscription Entity from Subscriber to Subject (Actor being subscribed) and Activity
*
* A new notification is then handled, informing all interested Actors of this action
*
* @throws ServerException
*/
public static function subscribe(int|Actor|LocalUser $subscriber, int|Actor|LocalUser $subject, string $source = 'web'): ?Activity
{
$subscriber_id = \is_int($subscriber) ? $subscriber : $subscriber->getId();
$subscribed_id = \is_int($subject) ? $subject : $subject->getId();
$opts = [
'subscriber_id' => $subscriber_id,
'subscribed_id' => $subscribed_id,
];
$subscription = DB::findOneBy(table: \Component\Subscription\Entity\Subscription::class, criteria: $opts, return_null: true);
$activity = null;
if (\is_null($subscription)) {
DB::persist(\Component\Subscription\Entity\Subscription::create($opts));
$activity = Activity::create([
'actor_id' => $subscriber_id,
'verb' => 'subscribe',
'object_type' => 'actor',
'object_id' => $subscribed_id,
'source' => $source,
]);
DB::persist($activity);
Event::handle('NewNotification', [
$actor = ($subscriber instanceof Actor ? $subscriber : Actor::getById($subscribed_id)),
$activity,
['object' => [$subscribed_id]],
_m('{nickname} subscribed to {subject}.', ['{actor}' => $actor->getId(), '{subject}' => $activity->getObjectId()]),
]);
}
return $activity;
}
/**
* Removes the Subscription Entity created beforehand, by the same Actor, and on the same subject
*
* Informs all interested Actors of this action, handling out the NewNotification event
*
* @throws ServerException
*/
public static function unsubscribe(int|Actor|LocalUser $subscriber, int|Actor|LocalUser $subject, string $source = 'web'): ?Activity
{
$subscriber_id = \is_int($subscriber) ? $subscriber : $subscriber->getId();
$subscribed_id = \is_int($subject) ? $subject : $subject->getId();
$opts = [
'subscriber_id' => $subscriber_id,
'subscribed_id' => $subscribed_id,
];
$subscription = DB::findOneBy(table: \Component\Subscription\Entity\Subscription::class, criteria: $opts, return_null: true);
$activity = null;
if (!\is_null($subscription)) {
// Remove Subscription
DB::remove($subscription);
$previous_follow_activity = DB::findBy('activity', ['verb' => 'subscribe', 'object_type' => 'actor', 'object_id' => $subscribed_id], order_by: ['created' => 'DESC'])[0];
// Store Activity
$activity = Activity::create([
'actor_id' => $subscriber_id,
'verb' => 'undo',
'object_type' => 'activity',
'object_id' => $previous_follow_activity->getId(),
'source' => $source,
]);
DB::persist($activity);
}
return $activity;
}
}