nextcloud/apps/files_external/service/storagesservice.php

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<?php
/**
2015-03-26 13:44:34 +03:00
* @author Vincent Petry <pvince81@owncloud.com>
*
* @copyright Copyright (c) 2015, ownCloud, Inc.
* @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 \OCP\IUserSession;
use \OC\Files\Filesystem;
use \OCA\Files_external\Lib\StorageConfig;
use \OCA\Files_external\NotFoundException;
/**
* Service class to manage external storages
*/
abstract class StoragesService {
/**
* Read legacy config data
*
* @return array list of mount configs
*/
protected function readLegacyConfig() {
// read global config
return \OC_Mount_Config::readData();
}
/**
* Copy legacy storage options into the given storage config object.
*
* @param StorageConfig $storageConfig storage config to populate
* @param string $mountType mount type
* @param string $applicable applicable user or group
* @param array $storageOptions legacy storage options
*
* @return StorageConfig populated storage config
*/
protected function populateStorageConfigWithLegacyOptions(
&$storageConfig,
$mountType,
$applicable,
$storageOptions
) {
$storageConfig->setBackendClass($storageOptions['class']);
$storageConfig->setBackendOptions($storageOptions['options']);
if (isset($storageOptions['mountOptions'])) {
$storageConfig->setMountOptions($storageOptions['mountOptions']);
}
if (isset($storageOptions['priority'])) {
$storageConfig->setPriority($storageOptions['priority']);
}
if ($mountType === \OC_Mount_Config::MOUNT_TYPE_USER) {
$applicableUsers = $storageConfig->getApplicableUsers();
if ($applicable !== 'all') {
$applicableUsers[] = $applicable;
$storageConfig->setApplicableUsers($applicableUsers);
}
} else if ($mountType === \OC_Mount_Config::MOUNT_TYPE_GROUP) {
$applicableGroups = $storageConfig->getApplicableGroups();
$applicableGroups[] = $applicable;
$storageConfig->setApplicableGroups($applicableGroups);
}
return $storageConfig;
}
/**
* Read the external storages config
*
* @return array map of storage id to storage config
*/
protected function readConfig() {
$mountPoints = $this->readLegacyConfig();
/**
* Here is the how the horribly messy mount point array looks like
* from the mount.json file:
*
* $storageOptions = $mountPoints[$mountType][$applicable][$mountPath]
*
* - $mountType is either "user" or "group"
* - $applicable is the name of a user or group (or the current user for personal mounts)
* - $mountPath is the mount point path (where the storage must be mounted)
* - $storageOptions is a map of storage options:
* - "priority": storage priority
* - "backend": backend class name
* - "options": backend-specific options
* - "mountOptions": mount-specific options (ex: disable previews, scanner, etc)
*/
// group by storage id
$storages = [];
// for storages without id (legacy), group by config hash for
// later processing
$storagesWithConfigHash = [];
foreach ($mountPoints as $mountType => $applicables) {
foreach ($applicables as $applicable => $mountPaths) {
foreach ($mountPaths as $rootMountPath => $storageOptions) {
$currentStorage = null;
/**
* Flag whether the config that was read already has an id.
* If not, it will use a config hash instead and generate
* a proper id later
*
* @var boolean
*/
$hasId = false;
// the root mount point is in the format "/$user/files/the/mount/point"
// we remove the "/$user/files" prefix
$parts = explode('/', trim($rootMountPath, '/'), 3);
if (count($parts) < 3) {
// something went wrong, skip
\OCP\Util::writeLog(
'files_external',
'Could not parse mount point "' . $rootMountPath . '"',
\OCP\Util::ERROR
);
continue;
}
$relativeMountPath = $parts[2];
// note: we cannot do this after the loop because the decrypted config
// options might be needed for the config hash
$storageOptions['options'] = \OC_Mount_Config::decryptPasswords($storageOptions['options']);
if (isset($storageOptions['id'])) {
$configId = (int)$storageOptions['id'];
if (isset($storages[$configId])) {
$currentStorage = $storages[$configId];
}
$hasId = true;
} else {
// missing id in legacy config, need to generate
// but at this point we don't know the max-id, so use
// first group it by config hash
$storageOptions['mountpoint'] = $rootMountPath;
$configId = \OC_Mount_Config::makeConfigHash($storageOptions);
if (isset($storagesWithConfigHash[$configId])) {
$currentStorage = $storagesWithConfigHash[$configId];
}
}
if (is_null($currentStorage)) {
// create new
$currentStorage = new StorageConfig($configId);
$currentStorage->setMountPoint($relativeMountPath);
}
$this->populateStorageConfigWithLegacyOptions(
$currentStorage,
$mountType,
$applicable,
$storageOptions
);
if ($hasId) {
$storages[$configId] = $currentStorage;
} else {
$storagesWithConfigHash[$configId] = $currentStorage;
}
}
}
}
// process storages with config hash, they must get a real id
if (!empty($storagesWithConfigHash)) {
$nextId = $this->generateNextId($storages);
foreach ($storagesWithConfigHash as $storage) {
$storage->setId($nextId);
$storages[$nextId] = $storage;
$nextId++;
}
// re-save the config with the generated ids
$this->writeConfig($storages);
}
return $storages;
}
/**
* Add mount point into the messy mount point structure
*
* @param array $mountPoints messy array of mount points
* @param string $mountType mount type
* @param string $applicable single applicable user or group
* @param string $rootMountPoint root mount point to use
* @param array $storageConfig storage config to set to the mount point
*/
protected function addMountPoint(&$mountPoints, $mountType, $applicable, $rootMountPoint, $storageConfig) {
if (!isset($mountPoints[$mountType])) {
$mountPoints[$mountType] = [];
}
if (!isset($mountPoints[$mountType][$applicable])) {
$mountPoints[$mountType][$applicable] = [];
}
$options = [
'id' => $storageConfig->getId(),
'class' => $storageConfig->getBackendClass(),
'options' => $storageConfig->getBackendOptions(),
];
if (!is_null($storageConfig->getPriority())) {
$options['priority'] = $storageConfig->getPriority();
}
if (!empty($storageConfig->getMountOptions())) {
$options['mountOptions'] = $storageConfig->getMountOptions();
}
$mountPoints[$mountType][$applicable][$rootMountPoint] = $options;
}
/**
* Write the storages to the configuration.
*
* @param array $storages map of storage id to storage config
*/
abstract protected function writeConfig($storages);
/**
* 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) {
$allStorages = $this->readConfig();
if (!isset($allStorages[$id])) {
throw new NotFoundException('Storage with id "' . $id . '" not found');
}
return $allStorages[$id];
}
/**
* Gets all storages
*
* @return array array of storage configs
*/
public function getAllStorages() {
return $this->readConfig();
}
/**
* Add new storage to the configuration
*
* @param array $newStorage storage attributes
*
* @return StorageConfig storage config, with added id
*/
public function addStorage(StorageConfig $newStorage) {
$allStorages = $this->readConfig();
$configId = $this->generateNextId($allStorages);
$newStorage->setId($configId);
// add new storage
$allStorages[$configId] = $newStorage;
$this->writeConfig($allStorages);
$this->triggerHooks($newStorage, Filesystem::signal_create_mount);
$newStorage->setStatus(\OC_Mount_Config::STATUS_SUCCESS);
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) {
\OC_Hook::emit(
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
* accomodate 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) {
$allStorages = $this->readConfig();
$id = $updatedStorage->getId();
if (!isset($allStorages[$id])) {
throw new NotFoundException('Storage with id "' . $id . '" not found');
}
$oldStorage = $allStorages[$id];
$allStorages[$id] = $updatedStorage;
$this->writeConfig($allStorages);
$this->triggerChangeHooks($oldStorage, $updatedStorage);
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) {
$allStorages = $this->readConfig();
if (!isset($allStorages[$id])) {
throw new NotFoundException('Storage with id "' . $id . '" not found');
}
$deletedStorage = $allStorages[$id];
unset($allStorages[$id]);
$this->writeConfig($allStorages);
$this->triggerHooks($deletedStorage, Filesystem::signal_delete_mount);
}
/**
* Generates a configuration id to use for a new configuration entry.
*
* @param array $allStorages array of all storage configs
*
* @return int id
*/
protected function generateNextId($allStorages) {
if (empty($allStorages)) {
return 1;
}
// note: this will mess up with with concurrency,
// but so did the mount.json. This horribly hack
// will disappear once we move to DB tables to
// store the config
return (max(array_keys($allStorages)) + 1);
}
}