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<?php
declare(strict_types=1);
/**
* @copyright Copyright (c) 2018 Arthur Schiwon <blizzz@arthur-schiwon.de>
*
* @author Arthur Schiwon <blizzz@arthur-schiwon.de>
* @author Daniel Kesselberg <mail@danielkesselberg.de>
*
* @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\Updater;
use OCP\AppFramework\Db\DoesNotExistException;
use OCP\Http\Client\IClientService;
use OCP\Http\Client\IResponse;
use OCP\ILogger;
class ChangesCheck {
/** @var IClientService */
protected $clientService;
/** @var ChangesMapper */
private $mapper;
/** @var ILogger */
private $logger;
const RESPONSE_NO_CONTENT = 0;
const RESPONSE_USE_CACHE = 1;
const RESPONSE_HAS_CONTENT = 2;
public function __construct(IClientService $clientService, ChangesMapper $mapper, ILogger $logger) {
$this->clientService = $clientService;
$this->mapper = $mapper;
$this->logger = $logger;
}
/**
* @throws DoesNotExistException
*/
public function getChangesForVersion(string $version): array {
$version = $this->normalizeVersion($version);
$changesInfo = $this->mapper->getChanges($version);
$changesData = json_decode($changesInfo->getData(), true);
if (empty($changesData)) {
throw new DoesNotExistException('Unable to decode changes info');
}
return $changesData;
}
/**
* @throws \Exception
*/
public function check(string $uri, string $version): array {
try {
$version = $this->normalizeVersion($version);
$changesInfo = $this->mapper->getChanges($version);
if($changesInfo->getLastCheck() + 1800 > time()) {
return json_decode($changesInfo->getData(), true);
}
} catch (DoesNotExistException $e) {
$changesInfo = new ChangesResult();
}
$response = $this->queryChangesServer($uri, $changesInfo);
switch($this->evaluateResponse($response)) {
case self::RESPONSE_NO_CONTENT:
return [];
case self::RESPONSE_USE_CACHE:
return json_decode($changesInfo->getData(), true);
case self::RESPONSE_HAS_CONTENT:
default:
$data = $this->extractData($response->getBody());
$changesInfo->setData(json_encode($data));
$changesInfo->setEtag($response->getHeader('Etag'));
$this->cacheResult($changesInfo, $version);
return $data;
}
}
protected function evaluateResponse(IResponse $response): int {
if($response->getStatusCode() === 304) {
return self::RESPONSE_USE_CACHE;
} else if($response->getStatusCode() === 404) {
return self::RESPONSE_NO_CONTENT;
} else if($response->getStatusCode() === 200) {
return self::RESPONSE_HAS_CONTENT;
}
$this->logger->debug('Unexpected return code {code} from changelog server', [
'app' => 'core',
'code' => $response->getStatusCode(),
]);
return self::RESPONSE_NO_CONTENT;
}
protected function cacheResult(ChangesResult $entry, string $version) {
if($entry->getVersion() === $version) {
$this->mapper->update($entry);
} else {
$entry->setVersion($version);
$this->mapper->insert($entry);
}
}
/**
* @throws \Exception
*/
protected function queryChangesServer(string $uri, ChangesResult $entry): IResponse {
$headers = [];
if($entry->getEtag() !== '') {
$headers['If-None-Match'] = [$entry->getEtag()];
}
$entry->setLastCheck(time());
$client = $this->clientService->newClient();
return $client->get($uri, [
'headers' => $headers,
]);
}
protected function extractData($body):array {
$data = [];
if ($body) {
$loadEntities = libxml_disable_entity_loader(true);
$xml = @simplexml_load_string($body);
libxml_disable_entity_loader($loadEntities);
if ($xml !== false) {
$data['changelogURL'] = (string)$xml->changelog['href'];
$data['whatsNew'] = [];
foreach($xml->whatsNew as $infoSet) {
$data['whatsNew'][(string)$infoSet['lang']] = [
'regular' => (array)$infoSet->regular->item,
'admin' => (array)$infoSet->admin->item,
];
}
} else {
libxml_clear_errors();
}
}
return $data;
}
/**
* returns a x.y.z form of the provided version. Extra numbers will be
* omitted, missing ones added as zeros.
*/
public function normalizeVersion(string $version): string {
$versionNumbers = array_slice(explode('.', $version), 0, 3);
$versionNumbers[0] = $versionNumbers[0] ?: '0'; // deal with empty input
while(count($versionNumbers) < 3) {
// changelog server expects x.y.z, pad 0 if it is too short
$versionNumbers[] = 0;
}
return implode('.', $versionNumbers);
}
}
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