nextcloud/lib/private/Files/ObjectStore/Swift.php

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<?php
/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
*
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* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Morris Jobke <hey@morrisjobke.de>
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* @author Robin Appelman <robin@icewind.nl>
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*
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* @license AGPL-3.0
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*
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* This code is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
*/
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namespace OC\Files\ObjectStore;
use Guzzle\Http\Exception\ClientErrorResponseException;
use OCP\Files\ObjectStore\IObjectStore;
use OCP\Files\StorageAuthException;
use OCP\Files\StorageNotAvailableException;
use OpenCloud\Common\Service\Catalog;
use OpenCloud\Common\Service\CatalogItem;
use OpenCloud\Identity\Resource\Token;
use OpenCloud\ObjectStore\Service;
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use OpenCloud\OpenStack;
use OpenCloud\Rackspace;
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class Swift implements IObjectStore {
/**
* @var \OpenCloud\OpenStack
*/
private $client;
/**
* @var array
*/
private $params;
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/**
* @var \OpenCloud\ObjectStore\Service
*/
private $objectStoreService;
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/**
* @var \OpenCloud\ObjectStore\Resource\Container
*/
private $container;
private $memcache;
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public function __construct($params) {
if (isset($params['bucket'])) {
$params['container'] = $params['bucket'];
}
if (!isset($params['container'])) {
$params['container'] = 'owncloud';
}
if (!isset($params['autocreate'])) {
// should only be true for tests
$params['autocreate'] = false;
}
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if (isset($params['apiKey'])) {
$this->client = new Rackspace($params['url'], $params);
$cacheKey = $this->params['username'] . '@' . $this->params['url'] . '/' . $this->params['bucket'];
} else {
$this->client = new OpenStack($params['url'], $params);
$cacheKey = $this->params['username'] . '@' . $this->params['url'] . '/' . $this->params['bucket'];
}
$cacheFactory = \OC::$server->getMemCacheFactory();
$this->memcache = $cacheFactory->create('swift::' . $cacheKey);
$this->params = $params;
}
protected function init() {
if ($this->container) {
return;
}
$this->importToken();
/** @var Token $token */
$token = $this->client->getTokenObject();
if (!$token || $token->hasExpired()) {
try {
$this->client->authenticate();
$this->exportToken();
} catch (ClientErrorResponseException $e) {
$statusCode = $e->getResponse()->getStatusCode();
if ($statusCode == 412) {
throw new StorageAuthException('Precondition failed, verify the keystone url', $e);
} else if ($statusCode === 401) {
throw new StorageAuthException('Authentication failed, verify the username, password and possibly tenant', $e);
} else {
throw new StorageAuthException('Unknown error', $e);
}
}
}
/** @var Catalog $catalog */
$catalog = $this->client->getCatalog();
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if (isset($this->params['serviceName'])) {
$serviceName = $this->params['serviceName'];
} else {
$serviceName = Service::DEFAULT_NAME;
}
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if (isset($this->params['urlType'])) {
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$urlType = $this->params['urlType'];
if ($urlType !== 'internalURL' && $urlType !== 'publicURL') {
throw new StorageNotAvailableException('Invalid url type');
}
} else {
$urlType = Service::DEFAULT_URL_TYPE;
}
$catalogItem = $this->getCatalogForService($catalog, $serviceName);
if (!$catalogItem) {
$available = implode(', ', $this->getAvailableServiceNames($catalog));
throw new StorageNotAvailableException(
"Service $serviceName not found in service catalog, available services: $available"
);
} else if (isset($this->params['region'])) {
$this->validateRegion($catalogItem, $this->params['region']);
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}
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$this->objectStoreService = $this->client->objectStoreService($serviceName, $this->params['region'], $urlType);
try {
$this->container = $this->objectStoreService->getContainer($this->params['container']);
} catch (ClientErrorResponseException $ex) {
// if the container does not exist and autocreate is true try to create the container on the fly
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if (isset($this->params['autocreate']) && $this->params['autocreate'] === true) {
$this->container = $this->objectStoreService->createContainer($this->params['container']);
} else {
throw $ex;
}
}
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}
private function exportToken() {
$export = $this->client->exportCredentials();
$export['catalog'] = array_map(function (CatalogItem $item) {
return [
'name' => $item->getName(),
'endpoints' => $item->getEndpoints(),
'type' => $item->getType()
];
}, $export['catalog']->getItems());
$this->memcache->set('token', json_encode($export));
}
private function importToken() {
$cachedTokenString = $this->memcache->get('token');
if ($cachedTokenString) {
$cachedToken = json_decode($cachedTokenString, true);
$cachedToken['catalog'] = array_map(function (array $item) {
$itemClass = new \stdClass();
$itemClass->name = $item['name'];
$itemClass->endpoints = array_map(function (array $endpoint) {
return (object) $endpoint;
}, $item['endpoints']);
$itemClass->type = $item['type'];
return $itemClass;
}, $cachedToken['catalog']);
try {
$this->client->importCredentials($cachedToken);
} catch (\Exception $e) {
$this->client->setTokenObject(new Token());
}
}
}
/**
* @param Catalog $catalog
* @param $name
* @return null|CatalogItem
*/
private function getCatalogForService(Catalog $catalog, $name) {
foreach ($catalog->getItems() as $item) {
/** @var CatalogItem $item */
if ($item->hasType(Service::DEFAULT_TYPE) && $item->hasName($name)) {
return $item;
}
}
return null;
}
private function validateRegion(CatalogItem $item, $region) {
$endPoints = $item->getEndpoints();
foreach ($endPoints as $endPoint) {
if ($endPoint->region === $region) {
return;
}
}
$availableRegions = implode(', ', array_map(function ($endpoint) {
return $endpoint->region;
}, $endPoints));
throw new StorageNotAvailableException("Invalid region '$region', available regions: $availableRegions");
}
private function getAvailableServiceNames(Catalog $catalog) {
return array_map(function (CatalogItem $item) {
return $item->getName();
}, array_filter($catalog->getItems(), function (CatalogItem $item) {
return $item->hasType(Service::DEFAULT_TYPE);
}));
}
/**
* @return string the container name where objects are stored
*/
public function getStorageId() {
return $this->params['container'];
}
/**
* @param string $urn the unified resource name used to identify the object
* @param resource $stream stream with the data to write
* @throws Exception from openstack lib when something goes wrong
*/
public function writeObject($urn, $stream) {
$this->init();
$this->container->uploadObject($urn, $stream);
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}
/**
* @param string $urn the unified resource name used to identify the object
* @return resource stream with the read data
* @throws Exception from openstack lib when something goes wrong
*/
public function readObject($urn) {
$this->init();
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$object = $this->container->getObject($urn);
// we need to keep a reference to objectContent or
// the stream will be closed before we can do anything with it
/** @var $objectContent \Guzzle\Http\EntityBody * */
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$objectContent = $object->getContent();
$objectContent->rewind();
$stream = $objectContent->getStream();
// save the object content in the context of the stream to prevent it being gc'd until the stream is closed
stream_context_set_option($stream, 'swift', 'content', $objectContent);
return $stream;
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}
/**
* @param string $urn Unified Resource Name
* @return void
* @throws Exception from openstack lib when something goes wrong
*/
public function deleteObject($urn) {
$this->init();
// see https://github.com/rackspace/php-opencloud/issues/243#issuecomment-30032242
$this->container->dataObject()->setName($urn)->delete();
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}
public function deleteContainer($recursive = false) {
$this->init();
$this->container->delete($recursive);
}
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}