Pony.fm/app/Commands/ToggleFavouriteCommand.php
2021-02-14 19:45:51 +00:00

112 lines
3.6 KiB
PHP

<?php
/**
* Pony.fm - A community for pony fan music.
* Copyright (C) 2015 Feld0.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
namespace App\Commands;
use App\Contracts\Favouritable;
use App\Models\Album;
use App\Models\Favourite;
use App\Models\Playlist;
use App\Models\ResourceUser;
use App\Models\Track;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Notification;
class ToggleFavouriteCommand extends CommandBase
{
private $_resourceType;
private $_resourceId;
public function __construct($resourceType, $resourceId)
{
$this->_resourceId = $resourceId;
$this->_resourceType = $resourceType;
}
/**
* @return bool
*/
public function authorize()
{
$user = Auth::user();
return $user != null;
}
private function getEntityBeingFavourited():Favouritable
{
switch ($this->_resourceType) {
case 'track':
return Track::find($this->_resourceId);
case 'album':
return Album::find($this->_resourceId);
case 'playlist':
return Playlist::find($this->_resourceId);
default:
throw new \InvalidArgumentException('Unknown resource type given!');
}
}
/**
* @throws \Exception
* @return CommandResponse
*/
public function execute()
{
$typeId = $this->_resourceType.'_id';
$existing = Favourite::where($typeId, '=', $this->_resourceId)->whereUserId(Auth::user()->id)->first();
$isFavourited = false;
if ($existing) {
$existing->delete();
} else {
$fav = new Favourite();
$fav->$typeId = $this->_resourceId;
$fav->user_id = Auth::user()->id;
$fav->save();
$isFavourited = true;
Notification::newFavourite($this->getEntityBeingFavourited(), $fav->user);
}
$resourceUser = ResourceUser::get(Auth::user()->id, $this->_resourceType, $this->_resourceId);
$resourceUser->is_favourited = $isFavourited;
$resourceUser->save();
$resourceTable = $this->_resourceType.'s';
// We do this to prevent a race condition. Sure I could simply increment the count columns and re-save back to the db
// but that would require an additional SELECT and the operation would be non-atomic. If two log items are created
// for the same resource at the same time, the cached values will still be correct with this method.
DB::table($resourceTable)->whereId($this->_resourceId)->update([
'favourite_count' => DB::raw('(
SELECT
COUNT(id)
FROM
favourites
WHERE '.
$typeId.' = '.$this->_resourceId.')'),
]);
return CommandResponse::succeed(['is_favourited' => $isFavourited]);
}
}