www.gusucode.com > Flarum开源的PHP国外手机版论坛 0.1 Beta2 源码程序 > Flarum_v0.1.beta2/extensions/subscriptions/src/Listeners/PersistSubscriptionData.php

    <?php 
/*
 * This file is part of Flarum.
 *
 * (c) Toby Zerner <toby.zerner@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Flarum\Subscriptions\Listeners;

use Flarum\Events\DiscussionWillBeSaved;
use Flarum\Core\Exceptions\PermissionDeniedException;

class PersistSubscriptionData
{
    public function subscribe($events)
    {
        $events->listen(DiscussionWillBeSaved::class, [$this, 'whenDiscussionWillBeSaved']);
    }

    public function whenDiscussionWillBeSaved(DiscussionWillBeSaved $event)
    {
        $discussion = $event->discussion;
        $data = $event->data;

        if (isset($data['attributes']['subscription'])) {
            $actor = $event->actor;
            $subscription = $data['attributes']['subscription'];

            if (! $actor->exists) {
                throw new PermissionDeniedException;
            }

            $state = $discussion->stateFor($actor);

            if (! in_array($subscription, ['follow', 'ignore'])) {
                $subscription = null;
            }

            $state->subscription = $subscription;
            $state->save();
        }
    }
}