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<?php
/**
* @copyright Copyright (c) 2016, ownCloud, Inc.
*
* @author Jesús Macias <jmacias@solidgear.es>
* @author Joas Schilling <coding@schilljs.com>
* @author Lukas Reschke <lukas@statuscode.ch>
* @author Robin Appelman <robin@icewind.nl>
* @author Robin McCorkell <robin@mccorkell.me.uk>
* @author Stefan Weil <sw@weilnetz.de>
* @author Vincent Petry <pvince81@owncloud.com>
*
* @license AGPL-3.0
*
* 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,
* 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, version 3,
* along with this program. If not, see <http://www.gnu.org/licenses/>
*
*/
namespace OCA\Files_External\Service;
use \OC\Files\Filesystem;
use OCA\Files_External\Lib\Auth\InvalidAuth;
use OCA\Files_External\Lib\Backend\InvalidBackend;
use OCA\Files_External\Lib\StorageConfig;
use OCA\Files_External\NotFoundException;
use \OCA\Files_External\Lib\Backend\Backend;
use \OCA\Files_External\Lib\Auth\AuthMechanism;
use OCP\Files\Config\IUserMountCache;
use \OCP\Files\StorageNotAvailableException;
/**
* Service class to manage external storages
*/
abstract class StoragesService {
/** @var BackendService */
protected $backendService;
/**
* @var DBConfigService
*/
protected $dbConfig;
/**
* @var IUserMountCache
*/
protected $userMountCache;
/**
* @param BackendService $backendService
* @param DBConfigService $dbConfigService
* @param IUserMountCache $userMountCache
*/
public function __construct(BackendService $backendService, DBConfigService $dbConfigService, IUserMountCache $userMountCache) {
$this->backendService = $backendService;
$this->dbConfig = $dbConfigService;
$this->userMountCache = $userMountCache;
}
protected function readDBConfig() {
return $this->dbConfig->getAdminMounts();
}
protected function getStorageConfigFromDBMount(array $mount) {
$applicableUsers = array_filter($mount['applicable'], function ($applicable) {
return $applicable['type'] === DBConfigService::APPLICABLE_TYPE_USER;
});
$applicableUsers = array_map(function ($applicable) {
return $applicable['value'];
}, $applicableUsers);
$applicableGroups = array_filter($mount['applicable'], function ($applicable) {
return $applicable['type'] === DBConfigService::APPLICABLE_TYPE_GROUP;
});
$applicableGroups = array_map(function ($applicable) {
return $applicable['value'];
}, $applicableGroups);
try {
$config = $this->createStorage(
$mount['mount_point'],
$mount['storage_backend'],
$mount['auth_backend'],
$mount['config'],
$mount['options'],
array_values($applicableUsers),
array_values($applicableGroups),
$mount['priority']
);
$config->setType($mount['type']);
$config->setId((int)$mount['mount_id']);
return $config;
} catch (\UnexpectedValueException $e) {
// don't die if a storage backend doesn't exist
\OCP\Util::writeLog(
'files_external',
'Could not load storage: "' . $e->getMessage() . '"',
\OCP\Util::ERROR
);
return null;
} catch (\InvalidArgumentException $e) {
\OCP\Util::writeLog(
'files_external',
'Could not load storage: "' . $e->getMessage() . '"',
\OCP\Util::ERROR
);
return null;
}
}
/**
* Read the external storages config
*
* @return array map of storage id to storage config
*/
protected function readConfig() {
$mounts = $this->readDBConfig();
$configs = array_map([$this, 'getStorageConfigFromDBMount'], $mounts);
$configs = array_filter($configs, function ($config) {
return $config instanceof StorageConfig;
});
$keys = array_map(function (StorageConfig $config) {
return $config->getId();
}, $configs);
return array_combine($keys, $configs);
}
/**
* Get a storage with status
*
* @param int $id storage id
*
* @return StorageConfig
* @throws NotFoundException if the storage with the given id was not found
*/
public function getStorage($id) {
$mount = $this->dbConfig->getMountById($id);
if (!is_array($mount)) {
throw new NotFoundException('Storage with ID "' . $id . '" not found');
}
$config = $this->getStorageConfigFromDBMount($mount);
if ($this->isApplicable($config)) {
return $config;
} else {
throw new NotFoundException('Storage with ID "' . $id . '" not found');
}
}
/**
* Check whether this storage service should provide access to a storage
*
* @param StorageConfig $config
* @return bool
*/
abstract protected function isApplicable(StorageConfig $config);
/**
* Gets all storages, valid or not
*
* @return StorageConfig[] array of storage configs
*/
public function getAllStorages() {
return $this->readConfig();
}
/**
* Gets all valid storages
*
* @return StorageConfig[]
*/
public function getStorages() {
return array_filter($this->getAllStorages(), [$this, 'validateStorage']);
}
/**
* Validate storage
* FIXME: De-duplicate with StoragesController::validate()
*
* @param StorageConfig $storage
* @return bool
*/
protected function validateStorage(StorageConfig $storage) {
/** @var Backend */
$backend = $storage->getBackend();
/** @var AuthMechanism */
$authMechanism = $storage->getAuthMechanism();
if (!$backend->isVisibleFor($this->getVisibilityType())) {
// not permitted to use backend
return false;
}
if (!$authMechanism->isVisibleFor($this->getVisibilityType())) {
// not permitted to use auth mechanism
return false;
}
return true;
}
/**
* Get the visibility type for this controller, used in validation
*
* @return string BackendService::VISIBILITY_* constants
*/
abstract public function getVisibilityType();
/**
* @return integer
*/
protected function getType() {
return DBConfigService::MOUNT_TYPE_ADMIN;
}
/**
* Add new storage to the configuration
*
* @param StorageConfig $newStorage storage attributes
*
* @return StorageConfig storage config, with added id
*/
public function addStorage(StorageConfig $newStorage) {
$allStorages = $this->readConfig();
$configId = $this->dbConfig->addMount(
$newStorage->getMountPoint(),
$newStorage->getBackend()->getIdentifier(),
$newStorage->getAuthMechanism()->getIdentifier(),
$newStorage->getPriority(),
$this->getType()
);
$newStorage->setId($configId);
foreach ($newStorage->getApplicableUsers() as $user) {
$this->dbConfig->addApplicable($configId, DBConfigService::APPLICABLE_TYPE_USER, $user);
}
foreach ($newStorage->getApplicableGroups() as $group) {
$this->dbConfig->addApplicable($configId, DBConfigService::APPLICABLE_TYPE_GROUP, $group);
}
foreach ($newStorage->getBackendOptions() as $key => $value) {
$this->dbConfig->setConfig($configId, $key, $value);
}
foreach ($newStorage->getMountOptions() as $key => $value) {
$this->dbConfig->setOption($configId, $key, $value);
}
if (count($newStorage->getApplicableUsers()) === 0 && count($newStorage->getApplicableGroups()) === 0) {
$this->dbConfig->addApplicable($configId, DBConfigService::APPLICABLE_TYPE_GLOBAL, null);
}
// add new storage
$allStorages[$configId] = $newStorage;
$this->triggerHooks($newStorage, Filesystem::signal_create_mount);
$newStorage->setStatus(StorageNotAvailableException::STATUS_SUCCESS);
return $newStorage;
}
/**
* Create a storage from its parameters
*
* @param string $mountPoint storage mount point
* @param string $backendIdentifier backend identifier
* @param string $authMechanismIdentifier authentication mechanism identifier
* @param array $backendOptions backend-specific options
* @param array|null $mountOptions mount-specific options
* @param array|null $applicableUsers users for which to mount the storage
* @param array|null $applicableGroups groups for which to mount the storage
* @param int|null $priority priority
*
* @return StorageConfig
*/
public function createStorage(
$mountPoint,
$backendIdentifier,
$authMechanismIdentifier,
$backendOptions,
$mountOptions = null,
$applicableUsers = null,
$applicableGroups = null,
$priority = null
) {
$backend = $this->backendService->getBackend($backendIdentifier);
if (!$backend) {
$backend = new InvalidBackend($backendIdentifier);
}
$authMechanism = $this->backendService->getAuthMechanism($authMechanismIdentifier);
if (!$authMechanism) {
$authMechanism = new InvalidAuth($authMechanismIdentifier);
}
$newStorage = new StorageConfig();
$newStorage->setMountPoint($mountPoint);
$newStorage->setBackend($backend);
$newStorage->setAuthMechanism($authMechanism);
$newStorage->setBackendOptions($backendOptions);
if (isset($mountOptions)) {
$newStorage->setMountOptions($mountOptions);
}
if (isset($applicableUsers)) {
$newStorage->setApplicableUsers($applicableUsers);
}
if (isset($applicableGroups)) {
$newStorage->setApplicableGroups($applicableGroups);
}
if (isset($priority)) {
$newStorage->setPriority($priority);
}
return $newStorage;
}
/**
* Triggers the given hook signal for all the applicables given
*
* @param string $signal signal
* @param string $mountPoint hook mount pount param
* @param string $mountType hook mount type param
* @param array $applicableArray array of applicable users/groups for which to trigger the hook
*/
protected function triggerApplicableHooks($signal, $mountPoint, $mountType, $applicableArray) {
foreach ($applicableArray as $applicable) {
\OCP\Util::emitHook(
Filesystem::CLASSNAME,
$signal,
[
Filesystem::signal_param_path => $mountPoint,
Filesystem::signal_param_mount_type => $mountType,
Filesystem::signal_param_users => $applicable,
]
);
}
}
/**
* Triggers $signal for all applicable users of the given
* storage
*
* @param StorageConfig $storage storage data
* @param string $signal signal to trigger
*/
abstract protected function triggerHooks(StorageConfig $storage, $signal);
/**
* Triggers signal_create_mount or signal_delete_mount to
* accommodate for additions/deletions in applicableUsers
* and applicableGroups fields.
*
* @param StorageConfig $oldStorage old storage data
* @param StorageConfig $newStorage new storage data
*/
abstract protected function triggerChangeHooks(StorageConfig $oldStorage, StorageConfig $newStorage);
/**
* Update storage to the configuration
*
* @param StorageConfig $updatedStorage storage attributes
*
* @return StorageConfig storage config
* @throws NotFoundException if the given storage does not exist in the config
*/
public function updateStorage(StorageConfig $updatedStorage) {
$id = $updatedStorage->getId();
$existingMount = $this->dbConfig->getMountById($id);
if (!is_array($existingMount)) {
throw new NotFoundException('Storage with ID "' . $id . '" not found while updating storage');
}
$oldStorage = $this->getStorageConfigFromDBMount($existingMount);
if ($oldStorage->getBackend() instanceof InvalidBackend) {
throw new NotFoundException('Storage with id "' . $id . '" cannot be edited due to missing backend');
}
$removedUsers = array_diff($oldStorage->getApplicableUsers(), $updatedStorage->getApplicableUsers());
$removedGroups = array_diff($oldStorage->getApplicableGroups(), $updatedStorage->getApplicableGroups());
$addedUsers = array_diff($updatedStorage->getApplicableUsers(), $oldStorage->getApplicableUsers());
$addedGroups = array_diff($updatedStorage->getApplicableGroups(), $oldStorage->getApplicableGroups());
$oldUserCount = count($oldStorage->getApplicableUsers());
$oldGroupCount = count($oldStorage->getApplicableGroups());
$newUserCount = count($updatedStorage->getApplicableUsers());
$newGroupCount = count($updatedStorage->getApplicableGroups());
$wasGlobal = ($oldUserCount + $oldGroupCount) === 0;
$isGlobal = ($newUserCount + $newGroupCount) === 0;
foreach ($removedUsers as $user) {
$this->dbConfig->removeApplicable($id, DBConfigService::APPLICABLE_TYPE_USER, $user);
}
foreach ($removedGroups as $group) {
$this->dbConfig->removeApplicable($id, DBConfigService::APPLICABLE_TYPE_GROUP, $group);
}
foreach ($addedUsers as $user) {
$this->dbConfig->addApplicable($id, DBConfigService::APPLICABLE_TYPE_USER, $user);
}
foreach ($addedGroups as $group) {
$this->dbConfig->addApplicable($id, DBConfigService::APPLICABLE_TYPE_GROUP, $group);
}
if ($wasGlobal && !$isGlobal) {
$this->dbConfig->removeApplicable($id, DBConfigService::APPLICABLE_TYPE_GLOBAL, null);
} else if (!$wasGlobal && $isGlobal) {
$this->dbConfig->addApplicable($id, DBConfigService::APPLICABLE_TYPE_GLOBAL, null);
}
$changedConfig = array_diff_assoc($updatedStorage->getBackendOptions(), $oldStorage->getBackendOptions());
$changedOptions = array_diff_assoc($updatedStorage->getMountOptions(), $oldStorage->getMountOptions());
foreach ($changedConfig as $key => $value) {
$this->dbConfig->setConfig($id, $key, $value);
}
foreach ($changedOptions as $key => $value) {
$this->dbConfig->setOption($id, $key, $value);
}
if ($updatedStorage->getMountPoint() !== $oldStorage->getMountPoint()) {
$this->dbConfig->setMountPoint($id, $updatedStorage->getMountPoint());
}
if ($updatedStorage->getAuthMechanism()->getIdentifier() !== $oldStorage->getAuthMechanism()->getIdentifier()) {
$this->dbConfig->setAuthBackend($id, $updatedStorage->getAuthMechanism()->getIdentifier());
}
$this->triggerChangeHooks($oldStorage, $updatedStorage);
if (($wasGlobal && !$isGlobal) || count($removedGroups) > 0) { // to expensive to properly handle these on the fly
$this->userMountCache->remoteStorageMounts($this->getStorageId($updatedStorage));
} else {
$storageId = $this->getStorageId($updatedStorage);
foreach ($removedUsers as $userId) {
$this->userMountCache->removeUserStorageMount($storageId, $userId);
}
}
return $this->getStorage($id);
}
/**
* Delete the storage with the given id.
*
* @param int $id storage id
*
* @throws NotFoundException if no storage was found with the given id
*/
public function removeStorage($id) {
$existingMount = $this->dbConfig->getMountById($id);
if (!is_array($existingMount)) {
throw new NotFoundException('Storage with ID "' . $id . '" not found');
}
$this->dbConfig->removeMount($id);
$deletedStorage = $this->getStorageConfigFromDBMount($existingMount);
$this->triggerHooks($deletedStorage, Filesystem::signal_delete_mount);
// delete oc_storages entries and oc_filecache
try {
$rustyStorageId = $this->getRustyStorageIdFromConfig($deletedStorage);
\OC\Files\Cache\Storage::remove($rustyStorageId);
} catch (\Exception $e) {
// can happen either for invalid configs where the storage could not
// be instantiated or whenever $user vars where used, in which case
// the storage id could not be computed
\OCP\Util::writeLog(
'files_external',
'Exception: "' . $e->getMessage() . '"',
\OCP\Util::ERROR
);
}
}
/**
* Returns the rusty storage id from oc_storages from the given storage config.
*
* @param StorageConfig $storageConfig
* @return string rusty storage id
*/
private function getRustyStorageIdFromConfig(StorageConfig $storageConfig) {
// if any of the storage options contains $user, it is not possible
// to compute the possible storage id as we don't know which users
// mounted it already (and we certainly don't want to iterate over ALL users)
foreach ($storageConfig->getBackendOptions() as $value) {
if (strpos($value, '$user') !== false) {
throw new \Exception('Cannot compute storage id for deletion due to $user vars in the configuration');
}
}
// note: similar to ConfigAdapter->prepateStorageConfig()
$storageConfig->getAuthMechanism()->manipulateStorageConfig($storageConfig);
$storageConfig->getBackend()->manipulateStorageConfig($storageConfig);
$class = $storageConfig->getBackend()->getStorageClass();
$storageImpl = new $class($storageConfig->getBackendOptions());
return $storageImpl->getId();
}
/**
* Construct the storage implementation
*
* @param StorageConfig $storageConfig
* @return int
*/
private function getStorageId(StorageConfig $storageConfig) {
try {
$class = $storageConfig->getBackend()->getStorageClass();
/** @var \OC\Files\Storage\Storage $storage */
$storage = new $class($storageConfig->getBackendOptions());
// auth mechanism should fire first
$storage = $storageConfig->getBackend()->wrapStorage($storage);
$storage = $storageConfig->getAuthMechanism()->wrapStorage($storage);
return $storage->getStorageCache()->getNumericId();
} catch (\Exception $e) {
return -1;
}
}
}