527 lines
16 KiB
PHP
527 lines
16 KiB
PHP
<?php
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/**
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* @author Lukas Reschke <lukas@owncloud.com>
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* @author Morris Jobke <hey@morrisjobke.de>
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* @author Vincent Petry <pvince81@owncloud.com>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
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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
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* 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
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* 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,
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* along with this program. If not, see <http://www.gnu.org/licenses/>
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*
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*/
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namespace OCA\Files_external\Service;
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use \OCP\IUserSession;
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use \OC\Files\Filesystem;
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use \OCA\Files_external\Lib\StorageConfig;
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use \OCA\Files_external\NotFoundException;
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use \OCA\Files_External\Service\BackendService;
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/**
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* Service class to manage external storages
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*/
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abstract class StoragesService {
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/** @var BackendService */
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protected $backendService;
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/**
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* @param BackendService $backendService
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*/
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public function __construct(BackendService $backendService) {
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$this->backendService = $backendService;
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}
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/**
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* Read legacy config data
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*
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* @return array list of mount configs
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*/
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protected function readLegacyConfig() {
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// read global config
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return \OC_Mount_Config::readData();
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}
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/**
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* Write legacy config data
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*
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* @param array $mountPoints
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*/
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protected function writeLegacyConfig(array $mountPoints) {
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// write global config
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\OC_Mount_Config::writeData(null, $mountPoints);
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}
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/**
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* Copy legacy storage options into the given storage config object.
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*
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* @param StorageConfig $storageConfig storage config to populate
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* @param string $mountType mount type
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* @param string $applicable applicable user or group
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* @param array $storageOptions legacy storage options
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*
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* @return StorageConfig populated storage config
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*/
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protected function populateStorageConfigWithLegacyOptions(
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&$storageConfig,
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$mountType,
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$applicable,
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$storageOptions
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) {
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$backend = $this->backendService->getBackend($storageOptions['backend']);
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if (!$backend) {
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throw new \UnexpectedValueException('Invalid backend '.$storageOptions['backend']);
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}
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$storageConfig->setBackend($backend);
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if (isset($storageOptions['authMechanism']) && $storageOptions['authMechanism'] !== 'builtin::builtin') {
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$authMechanism = $this->backendService->getAuthMechanism($storageOptions['authMechanism']);
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} else {
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$authMechanism = $backend->getLegacyAuthMechanism($storageOptions);
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$storageOptions['authMechanism'] = 'null'; // to make error handling easier
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}
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if (!$authMechanism) {
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throw new \UnexpectedValueException('Invalid authentication mechanism '.$storageOptions['authMechanism']);
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}
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$storageConfig->setAuthMechanism($authMechanism);
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$storageConfig->setBackendOptions($storageOptions['options']);
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if (isset($storageOptions['mountOptions'])) {
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$storageConfig->setMountOptions($storageOptions['mountOptions']);
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}
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if (!isset($storageOptions['priority'])) {
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$storageOptions['priority'] = $backend->getPriority();
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}
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$storageConfig->setPriority($storageOptions['priority']);
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if ($mountType === \OC_Mount_Config::MOUNT_TYPE_USER) {
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$applicableUsers = $storageConfig->getApplicableUsers();
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if ($applicable !== 'all') {
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$applicableUsers[] = $applicable;
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$storageConfig->setApplicableUsers($applicableUsers);
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}
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} else if ($mountType === \OC_Mount_Config::MOUNT_TYPE_GROUP) {
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$applicableGroups = $storageConfig->getApplicableGroups();
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$applicableGroups[] = $applicable;
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$storageConfig->setApplicableGroups($applicableGroups);
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}
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return $storageConfig;
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}
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/**
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* Read the external storages config
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*
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* @return array map of storage id to storage config
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*/
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protected function readConfig() {
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$mountPoints = $this->readLegacyConfig();
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/**
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* Here is the how the horribly messy mount point array looks like
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* from the mount.json file:
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*
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* $storageOptions = $mountPoints[$mountType][$applicable][$mountPath]
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*
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* - $mountType is either "user" or "group"
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* - $applicable is the name of a user or group (or the current user for personal mounts)
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* - $mountPath is the mount point path (where the storage must be mounted)
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* - $storageOptions is a map of storage options:
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* - "priority": storage priority
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* - "backend": backend identifier
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* - "class": LEGACY backend class name
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* - "options": backend-specific options
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* - "authMechanism": authentication mechanism identifier
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* - "mountOptions": mount-specific options (ex: disable previews, scanner, etc)
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*/
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// group by storage id
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$storages = [];
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// for storages without id (legacy), group by config hash for
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// later processing
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$storagesWithConfigHash = [];
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foreach ($mountPoints as $mountType => $applicables) {
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foreach ($applicables as $applicable => $mountPaths) {
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foreach ($mountPaths as $rootMountPath => $storageOptions) {
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$currentStorage = null;
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/**
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* Flag whether the config that was read already has an id.
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* If not, it will use a config hash instead and generate
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* a proper id later
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*
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* @var boolean
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*/
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$hasId = false;
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// the root mount point is in the format "/$user/files/the/mount/point"
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// we remove the "/$user/files" prefix
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$parts = explode('/', trim($rootMountPath, '/'), 3);
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if (count($parts) < 3) {
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// something went wrong, skip
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\OCP\Util::writeLog(
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'files_external',
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'Could not parse mount point "' . $rootMountPath . '"',
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\OCP\Util::ERROR
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);
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continue;
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}
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$relativeMountPath = $parts[2];
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// note: we cannot do this after the loop because the decrypted config
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// options might be needed for the config hash
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$storageOptions['options'] = \OC_Mount_Config::decryptPasswords($storageOptions['options']);
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if (!isset($storageOptions['backend'])) {
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$storageOptions['backend'] = $storageOptions['class']; // legacy compat
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}
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if (!isset($storageOptions['authMechanism'])) {
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$storageOptions['authMechanism'] = null; // ensure config hash works
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}
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if (isset($storageOptions['id'])) {
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$configId = (int)$storageOptions['id'];
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if (isset($storages[$configId])) {
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$currentStorage = $storages[$configId];
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}
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$hasId = true;
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} else {
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// missing id in legacy config, need to generate
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// but at this point we don't know the max-id, so use
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// first group it by config hash
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$storageOptions['mountpoint'] = $rootMountPath;
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$configId = \OC_Mount_Config::makeConfigHash($storageOptions);
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if (isset($storagesWithConfigHash[$configId])) {
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$currentStorage = $storagesWithConfigHash[$configId];
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}
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}
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if (is_null($currentStorage)) {
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// create new
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$currentStorage = new StorageConfig($configId);
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$currentStorage->setMountPoint($relativeMountPath);
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}
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$this->populateStorageConfigWithLegacyOptions(
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$currentStorage,
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$mountType,
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$applicable,
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$storageOptions
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);
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if ($hasId) {
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$storages[$configId] = $currentStorage;
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} else {
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$storagesWithConfigHash[$configId] = $currentStorage;
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}
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}
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}
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}
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// process storages with config hash, they must get a real id
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if (!empty($storagesWithConfigHash)) {
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$this->setRealStorageIds($storages, $storagesWithConfigHash);
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}
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// convert parameter values
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foreach ($storages as $storage) {
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$storage->getBackend()->validateStorageDefinition($storage);
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$storage->getAuthMechanism()->validateStorageDefinition($storage);
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}
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return $storages;
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}
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/**
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* Replace config hash ID with real IDs, for migrating legacy storages
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*
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* @param StorageConfig[] $storages Storages with real IDs
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* @param StorageConfig[] $storagesWithConfigHash Storages with config hash IDs
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*/
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protected function setRealStorageIds(array &$storages, array $storagesWithConfigHash) {
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$nextId = $this->generateNextId($storages);
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foreach ($storagesWithConfigHash as $storage) {
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$storage->setId($nextId);
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$storages[$nextId] = $storage;
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$nextId++;
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}
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// re-save the config with the generated ids
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$this->writeConfig($storages);
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}
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/**
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* Add mount point into the messy mount point structure
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*
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* @param array $mountPoints messy array of mount points
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* @param string $mountType mount type
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* @param string $applicable single applicable user or group
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* @param string $rootMountPoint root mount point to use
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* @param array $storageConfig storage config to set to the mount point
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*/
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protected function addMountPoint(&$mountPoints, $mountType, $applicable, $rootMountPoint, $storageConfig) {
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if (!isset($mountPoints[$mountType])) {
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$mountPoints[$mountType] = [];
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}
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if (!isset($mountPoints[$mountType][$applicable])) {
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$mountPoints[$mountType][$applicable] = [];
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}
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$options = [
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'id' => $storageConfig->getId(),
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'backend' => $storageConfig->getBackend()->getIdentifier(),
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//'class' => $storageConfig->getBackend()->getClass(),
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'authMechanism' => $storageConfig->getAuthMechanism()->getIdentifier(),
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'options' => $storageConfig->getBackendOptions(),
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];
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if (!is_null($storageConfig->getPriority())) {
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$options['priority'] = $storageConfig->getPriority();
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}
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$mountOptions = $storageConfig->getMountOptions();
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if (!empty($mountOptions)) {
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$options['mountOptions'] = $mountOptions;
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}
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$mountPoints[$mountType][$applicable][$rootMountPoint] = $options;
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}
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/**
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* Write the storages to the configuration.
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*
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* @param array $storages map of storage id to storage config
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*/
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abstract protected function writeConfig($storages);
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/**
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* Get a storage with status
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*
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* @param int $id storage id
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*
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* @return StorageConfig
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* @throws NotFoundException if the storage with the given id was not found
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*/
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public function getStorage($id) {
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$allStorages = $this->readConfig();
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if (!isset($allStorages[$id])) {
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throw new NotFoundException('Storage with id "' . $id . '" not found');
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}
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return $allStorages[$id];
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}
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/**
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* Gets all storages
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*
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* @return array array of storage configs
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*/
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public function getAllStorages() {
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return $this->readConfig();
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}
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/**
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* Add new storage to the configuration
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*
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* @param array $newStorage storage attributes
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*
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* @return StorageConfig storage config, with added id
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*/
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public function addStorage(StorageConfig $newStorage) {
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$allStorages = $this->readConfig();
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$configId = $this->generateNextId($allStorages);
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$newStorage->setId($configId);
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// add new storage
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$allStorages[$configId] = $newStorage;
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$this->writeConfig($allStorages);
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$this->triggerHooks($newStorage, Filesystem::signal_create_mount);
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$newStorage->setStatus(\OC_Mount_Config::STATUS_SUCCESS);
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return $newStorage;
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}
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/**
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* Create a storage from its parameters
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*
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* @param string $mountPoint storage mount point
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* @param string $backendIdentifier backend identifier
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* @param string $authMechanismIdentifier authentication mechanism identifier
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* @param array $backendOptions backend-specific options
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* @param array|null $mountOptions mount-specific options
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* @param array|null $applicableUsers users for which to mount the storage
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* @param array|null $applicableGroups groups for which to mount the storage
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* @param int|null $priority priority
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*
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* @return StorageConfig
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*/
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public function createStorage(
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$mountPoint,
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$backendIdentifier,
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$authMechanismIdentifier,
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$backendOptions,
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$mountOptions = null,
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$applicableUsers = null,
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$applicableGroups = null,
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$priority = null
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) {
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$backend = $this->backendService->getBackend($backendIdentifier);
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if (!$backend) {
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throw new \InvalidArgumentException('Unable to get backend for '.$backendIdentifier);
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}
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$authMechanism = $this->backendService->getAuthMechanism($authMechanismIdentifier);
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if (!$authMechanism) {
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throw new \InvalidArgumentException('Unable to get authentication mechanism for '.$authMechanismIdentifier);
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}
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$newStorage = new StorageConfig();
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$newStorage->setMountPoint($mountPoint);
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$newStorage->setBackend($backend);
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$newStorage->setAuthMechanism($authMechanism);
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$newStorage->setBackendOptions($backendOptions);
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if (isset($mountOptions)) {
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$newStorage->setMountOptions($mountOptions);
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}
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if (isset($applicableUsers)) {
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$newStorage->setApplicableUsers($applicableUsers);
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}
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if (isset($applicableGroups)) {
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$newStorage->setApplicableGroups($applicableGroups);
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}
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if (isset($priority)) {
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$newStorage->setPriority($priority);
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}
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return $newStorage;
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}
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/**
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* Triggers the given hook signal for all the applicables given
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*
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* @param string $signal signal
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* @param string $mountPoint hook mount pount param
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* @param string $mountType hook mount type param
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* @param array $applicableArray array of applicable users/groups for which to trigger the hook
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*/
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protected function triggerApplicableHooks($signal, $mountPoint, $mountType, $applicableArray) {
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foreach ($applicableArray as $applicable) {
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\OCP\Util::emitHook(
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Filesystem::CLASSNAME,
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$signal,
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[
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Filesystem::signal_param_path => $mountPoint,
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Filesystem::signal_param_mount_type => $mountType,
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Filesystem::signal_param_users => $applicable,
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]
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);
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}
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}
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/**
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* Triggers $signal for all applicable users of the given
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* storage
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*
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* @param StorageConfig $storage storage data
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* @param string $signal signal to trigger
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*/
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abstract protected function triggerHooks(StorageConfig $storage, $signal);
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/**
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* Triggers signal_create_mount or signal_delete_mount to
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* accomodate for additions/deletions in applicableUsers
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* and applicableGroups fields.
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*
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* @param StorageConfig $oldStorage old storage data
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* @param StorageConfig $newStorage new storage data
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*/
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abstract protected function triggerChangeHooks(StorageConfig $oldStorage, StorageConfig $newStorage);
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/**
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* Update storage to the configuration
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*
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* @param StorageConfig $updatedStorage storage attributes
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*
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* @return StorageConfig storage config
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* @throws NotFoundException if the given storage does not exist in the config
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*/
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public function updateStorage(StorageConfig $updatedStorage) {
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$allStorages = $this->readConfig();
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$id = $updatedStorage->getId();
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if (!isset($allStorages[$id])) {
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throw new NotFoundException('Storage with id "' . $id . '" not found');
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}
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$oldStorage = $allStorages[$id];
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$allStorages[$id] = $updatedStorage;
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$this->writeConfig($allStorages);
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$this->triggerChangeHooks($oldStorage, $updatedStorage);
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return $this->getStorage($id);
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}
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/**
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* Delete the storage with the given id.
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*
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* @param int $id storage id
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*
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* @throws NotFoundException if no storage was found with the given id
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*/
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public function removeStorage($id) {
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$allStorages = $this->readConfig();
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if (!isset($allStorages[$id])) {
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throw new NotFoundException('Storage with id "' . $id . '" not found');
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}
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$deletedStorage = $allStorages[$id];
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unset($allStorages[$id]);
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$this->writeConfig($allStorages);
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$this->triggerHooks($deletedStorage, Filesystem::signal_delete_mount);
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}
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/**
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* Generates a configuration id to use for a new configuration entry.
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*
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* @param array $allStorages array of all storage configs
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*
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* @return int id
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*/
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protected function generateNextId($allStorages) {
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if (empty($allStorages)) {
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return 1;
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}
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// note: this will mess up with with concurrency,
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// but so did the mount.json. This horribly hack
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// will disappear once we move to DB tables to
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// store the config
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return (max(array_keys($allStorages)) + 1);
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}
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}
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