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<?php
/*
 * Copyright (c) 2022 Xibo Signage Ltd
 *
 * Xibo - Digital Signage - http://www.xibo.org.uk
 *
 * This file is part of Xibo.
 *
 * Xibo 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
 * any later version.
 *
 * Xibo 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 Xibo.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Xibo\Widget;

use GuzzleHttp\Client;
use GuzzleHttp\Exception\RequestException;
use Stash\Invalidation;
use Xibo\Support\Exception\ConfigurationException;

trait IcsTrait
{
    /**
     * Get the feed from Cache or Source
     * @return bool|string
     * @throws ConfigurationException
     */
    private function getFeed()
    {
        // Create a key to use as a caching key for this item.
        // the rendered feed will be cached, so it is important the key covers all options.
        $feedUrl = urldecode($this->getOption('uri'));

if (empty($feedUrl)) {
            throw new ConfigurationException(__('Please provide a calendar feed URL'));
        }

/** @var \Stash\Item $cache */
        $cache = $this->getPool()->getItem($this->makeCacheKey(md5($feedUrl)));
        $cache->setInvalidationMethod(Invalidation::SLEEP, 5000, 15);

$this->getLog()->debug('Calendar ' . $feedUrl . '. Cache key: ' . $cache->getKey());

// Get the document out of the cache
        $document = $cache->get();

// Check our cache to see if the key exists
        if ($cache->isMiss()) {
            // Invalid local cache
            $this->getLog()->debug('Cache Miss, getting ICS file');

// Lock this cache item (120 seconds)
            $cache->lock(120);

try {
                // Create a Guzzle Client to get the Feed XML
                $client = new Client();
                $response = $client->get($feedUrl, $this->getConfig()->getGuzzleProxy([
                    'timeout' => 20 // wait no more than 20 seconds: https://github.com/xibosignage/xibo/issues/1401
                ]));

$document = $response->getBody()->getContents();
            } catch (RequestException $requestException) {
                // Log and return empty?
                $this->getLog()->error('Unable to get feed: ' . $requestException->getMessage());
                $this->getLog()->debug($requestException->getTraceAsString());

throw new ConfigurationException(__('Unable to download feed'));
            }

// Add this to the cache.
            $cache->set($document);
            $cache->expiresAfter($this->getOption('updateInterval', 360) * 60);

// Save
            $this->getPool()->saveDeferred($cache);
        } else {
            $this->getLog()->debug('Feed returned from Cache');
        }

return $document;
    }
}