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<?php
/**
* @copyright Copyright (c) 2016 Lukas Reschke <lukas@statuscode.ch>
*
* @license GNU AGPL version 3 or any later version
*
* 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 OC\App\AppStore\Fetcher;
use OC\Files\AppData\Factory;
use GuzzleHttp\Exception\ConnectException;
use OCP\AppFramework\Http;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\Files\IAppData;
use OCP\Files\NotFoundException;
use OCP\Http\Client\IClientService;
use OCP\IConfig;
use OCP\ILogger;
abstract class Fetcher {
const INVALIDATE_AFTER_SECONDS = 300;
/** @var IAppData */
protected $appData;
/** @var IClientService */
protected $clientService;
/** @var ITimeFactory */
protected $timeFactory;
/** @var IConfig */
protected $config;
/** @var Ilogger */
protected $logger;
/** @var string */
protected $fileName;
/** @var string */
protected $endpointUrl;
/** @var string */
protected $version;
/**
* @param Factory $appDataFactory
* @param IClientService $clientService
* @param ITimeFactory $timeFactory
* @param IConfig $config
* @param ILogger $logger
*/
public function __construct(Factory $appDataFactory,
IClientService $clientService,
ITimeFactory $timeFactory,
IConfig $config,
ILogger $logger) {
$this->appData = $appDataFactory->get('appstore');
$this->clientService = $clientService;
$this->timeFactory = $timeFactory;
$this->config = $config;
$this->logger = $logger;
}
/**
* Fetches the response from the server
*
* @param string $ETag
* @param string $content
*
* @return array
*/
protected function fetch($ETag, $content) {
$appstoreenabled = $this->config->getSystemValue('appstoreenabled', true);
if (!$appstoreenabled) {
return [];
}
$options = [];
if ($ETag !== '') {
$options['headers'] = [
'If-None-Match' => $ETag,
];
}
$client = $this->clientService->newClient();
$response = $client->get($this->endpointUrl, $options);
$responseJson = [];
if ($response->getStatusCode() === Http::STATUS_NOT_MODIFIED) {
$responseJson['data'] = json_decode($content, true);
} else {
$responseJson['data'] = json_decode($response->getBody(), true);
$ETag = $response->getHeader('ETag');
}
$responseJson['timestamp'] = $this->timeFactory->getTime();
$responseJson['ncversion'] = $this->getVersion();
if ($ETag !== '') {
$responseJson['ETag'] = $ETag;
}
return $responseJson;
}
/**
* Returns the array with the categories on the appstore server
*
* @return array
*/
public function get() {
$appstoreenabled = $this->config->getSystemValue('appstoreenabled', true);
if (!$appstoreenabled) {
return [];
}
$rootFolder = $this->appData->getFolder('/');
$ETag = '';
$content = '';
try {
// File does already exists
$file = $rootFolder->getFile($this->fileName);
$jsonBlob = json_decode($file->getContent(), true);
if (is_array($jsonBlob)) {
// No caching when the version has been updated
if (isset($jsonBlob['ncversion']) && $jsonBlob['ncversion'] === $this->getVersion()) {
// If the timestamp is older than 300 seconds request the files new
if ((int)$jsonBlob['timestamp'] > ($this->timeFactory->getTime() - self::INVALIDATE_AFTER_SECONDS)) {
return $jsonBlob['data'];
}
if (isset($jsonBlob['ETag'])) {
$ETag = $jsonBlob['ETag'];
$content = json_encode($jsonBlob['data']);
}
}
}
} catch (NotFoundException $e) {
// File does not already exists
$file = $rootFolder->newFile($this->fileName);
}
// Refresh the file content
try {
$responseJson = $this->fetch($ETag, $content);
$file->putContent(json_encode($responseJson));
return json_decode($file->getContent(), true)['data'];
} catch (ConnectException $e) {
$this->logger->logException($e, ['app' => 'appstoreFetcher']);
return [];
} catch (\Exception $e) {
return [];
}
}
/**
* Get the currently Nextcloud version
* @return string
*/
protected function getVersion() {
if ($this->version === null) {
$this->version = $this->config->getSystemValue('version', '0.0.0');
}
return $this->version;
}
/**
* Set the current Nextcloud version
* @param string $version
*/
public function setVersion($version) {
$this->version = $version;
}
}
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