359 lines
9.0 KiB
PHP
359 lines
9.0 KiB
PHP
<?php
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/**
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* @copyright Copyright (c) 2016, ownCloud, Inc.
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*
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* @author Aaron Wood <aaronjwood@gmail.com>
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* @author Lukas Reschke <lukas@statuscode.ch>
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* @author Thomas Müller <thomas.mueller@tmit.eu>
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* @author Vincent Petry <pvince81@owncloud.com>
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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
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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\DAV\Connector\Sabre;
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use OCP\IDBConnection;
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use OCP\IUser;
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use Sabre\DAV\PropertyStorage\Backend\BackendInterface;
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use Sabre\DAV\PropFind;
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use Sabre\DAV\PropPatch;
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use Sabre\DAV\Tree;
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use Sabre\DAV\Exception\NotFound;
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use Sabre\DAV\Exception\ServiceUnavailable;
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class CustomPropertiesBackend implements BackendInterface {
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/**
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* Ignored properties
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*
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* @var array
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*/
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private $ignoredProperties = array(
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'{DAV:}getcontentlength',
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'{DAV:}getcontenttype',
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'{DAV:}getetag',
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'{DAV:}quota-used-bytes',
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'{DAV:}quota-available-bytes',
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'{DAV:}quota-available-bytes',
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'{http://owncloud.org/ns}permissions',
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'{http://owncloud.org/ns}downloadURL',
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'{http://owncloud.org/ns}dDC',
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'{http://owncloud.org/ns}size',
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'{http://nextcloud.org/ns}is-encrypted',
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);
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/**
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* @var Tree
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*/
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private $tree;
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/**
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* @var IDBConnection
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*/
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private $connection;
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/**
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* @var IUser
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*/
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private $user;
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/**
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* Properties cache
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*
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* @var array
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*/
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private $cache = [];
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/**
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* @param Tree $tree node tree
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* @param IDBConnection $connection database connection
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* @param IUser $user owner of the tree and properties
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*/
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public function __construct(
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Tree $tree,
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IDBConnection $connection,
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IUser $user) {
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$this->tree = $tree;
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$this->connection = $connection;
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$this->user = $user->getUID();
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}
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/**
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* Fetches properties for a path.
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*
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* @param string $path
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* @param PropFind $propFind
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* @return void
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*/
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public function propFind($path, PropFind $propFind) {
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try {
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$node = $this->tree->getNodeForPath($path);
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if (!($node instanceof Node)) {
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return;
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}
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} catch (ServiceUnavailable $e) {
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// might happen for unavailable mount points, skip
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return;
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} catch (NotFound $e) {
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// in some rare (buggy) cases the node might not be found,
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// we catch the exception to prevent breaking the whole list with a 404
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// (soft fail)
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\OC::$server->getLogger()->warning(
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'Could not get node for path: \"' . $path . '\" : ' . $e->getMessage(),
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array('app' => 'files')
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);
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return;
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}
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$requestedProps = $propFind->get404Properties();
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// these might appear
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$requestedProps = array_diff(
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$requestedProps,
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$this->ignoredProperties
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);
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if (empty($requestedProps)) {
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return;
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}
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if ($node instanceof Directory
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&& $propFind->getDepth() !== 0
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) {
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// note: pre-fetching only supported for depth <= 1
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$this->loadChildrenProperties($node, $requestedProps);
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}
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$props = $this->getProperties($node, $requestedProps);
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foreach ($props as $propName => $propValue) {
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$propFind->set($propName, $propValue);
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}
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}
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/**
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* Updates properties for a path
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*
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* @param string $path
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* @param PropPatch $propPatch
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*
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* @return void
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*/
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public function propPatch($path, PropPatch $propPatch) {
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$node = $this->tree->getNodeForPath($path);
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if (!($node instanceof Node)) {
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return;
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}
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$propPatch->handleRemaining(function($changedProps) use ($node) {
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return $this->updateProperties($node, $changedProps);
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});
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}
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/**
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* This method is called after a node is deleted.
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*
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* @param string $path path of node for which to delete properties
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*/
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public function delete($path) {
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$statement = $this->connection->prepare(
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'DELETE FROM `*PREFIX*properties` WHERE `userid` = ? AND `propertypath` = ?'
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);
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$statement->execute(array($this->user, '/' . $path));
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$statement->closeCursor();
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unset($this->cache[$path]);
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}
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/**
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* This method is called after a successful MOVE
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*
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* @param string $source
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* @param string $destination
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*
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* @return void
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*/
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public function move($source, $destination) {
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$statement = $this->connection->prepare(
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'UPDATE `*PREFIX*properties` SET `propertypath` = ?' .
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' WHERE `userid` = ? AND `propertypath` = ?'
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);
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$statement->execute(array('/' . $destination, $this->user, '/' . $source));
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$statement->closeCursor();
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}
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/**
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* Returns a list of properties for this nodes.;
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* @param Node $node
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* @param array $requestedProperties requested properties or empty array for "all"
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* @return array
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* @note The properties list is a list of propertynames the client
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* requested, encoded as xmlnamespace#tagName, for example:
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* http://www.example.org/namespace#author If the array is empty, all
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* properties should be returned
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*/
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private function getProperties(Node $node, array $requestedProperties) {
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$path = $node->getPath();
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if (isset($this->cache[$path])) {
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return $this->cache[$path];
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}
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// TODO: chunking if more than 1000 properties
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$sql = 'SELECT * FROM `*PREFIX*properties` WHERE `userid` = ? AND `propertypath` = ?';
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$whereValues = array($this->user, $path);
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$whereTypes = array(null, null);
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if (!empty($requestedProperties)) {
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// request only a subset
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$sql .= ' AND `propertyname` in (?)';
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$whereValues[] = $requestedProperties;
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$whereTypes[] = \Doctrine\DBAL\Connection::PARAM_STR_ARRAY;
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}
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$result = $this->connection->executeQuery(
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$sql,
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$whereValues,
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$whereTypes
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);
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$props = [];
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while ($row = $result->fetch()) {
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$props[$row['propertyname']] = $row['propertyvalue'];
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}
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$result->closeCursor();
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$this->cache[$path] = $props;
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return $props;
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}
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/**
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* Update properties
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*
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* @param Node $node node for which to update properties
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* @param array $properties array of properties to update
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*
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* @return bool
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*/
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private function updateProperties($node, $properties) {
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$path = $node->getPath();
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$deleteStatement = 'DELETE FROM `*PREFIX*properties`' .
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' WHERE `userid` = ? AND `propertypath` = ? AND `propertyname` = ?';
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$insertStatement = 'INSERT INTO `*PREFIX*properties`' .
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' (`userid`,`propertypath`,`propertyname`,`propertyvalue`) VALUES(?,?,?,?)';
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$updateStatement = 'UPDATE `*PREFIX*properties` SET `propertyvalue` = ?' .
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' WHERE `userid` = ? AND `propertypath` = ? AND `propertyname` = ?';
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// TODO: use "insert or update" strategy ?
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$existing = $this->getProperties($node, array());
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$this->connection->beginTransaction();
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foreach ($properties as $propertyName => $propertyValue) {
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// If it was null, we need to delete the property
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if (is_null($propertyValue)) {
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if (array_key_exists($propertyName, $existing)) {
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$this->connection->executeUpdate($deleteStatement,
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array(
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$this->user,
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$path,
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$propertyName
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)
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);
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}
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} else {
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if (!array_key_exists($propertyName, $existing)) {
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$this->connection->executeUpdate($insertStatement,
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array(
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$this->user,
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$path,
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$propertyName,
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$propertyValue
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)
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);
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} else {
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$this->connection->executeUpdate($updateStatement,
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array(
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$propertyValue,
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$this->user,
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$path,
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$propertyName
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)
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);
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}
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}
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}
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$this->connection->commit();
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unset($this->cache[$path]);
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return true;
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}
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/**
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* Bulk load properties for directory children
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*
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* @param Directory $node
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* @param array $requestedProperties requested properties
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*
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* @return void
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*/
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private function loadChildrenProperties(Directory $node, $requestedProperties) {
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$path = $node->getPath();
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if (isset($this->cache[$path])) {
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// we already loaded them at some point
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return;
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}
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$childNodes = $node->getChildren();
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// pre-fill cache
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foreach ($childNodes as $childNode) {
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$this->cache[$childNode->getPath()] = [];
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}
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$sql = 'SELECT * FROM `*PREFIX*properties` WHERE `userid` = ? AND `propertypath` LIKE ?';
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$sql .= ' AND `propertyname` in (?) ORDER BY `propertypath`, `propertyname`';
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$result = $this->connection->executeQuery(
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$sql,
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array($this->user, $this->connection->escapeLikeParameter(rtrim($path, '/')) . '/%', $requestedProperties),
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array(null, null, \Doctrine\DBAL\Connection::PARAM_STR_ARRAY)
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);
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$oldPath = null;
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$props = [];
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while ($row = $result->fetch()) {
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$path = $row['propertypath'];
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if ($oldPath !== $path) {
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// save previously gathered props
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$this->cache[$oldPath] = $props;
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$oldPath = $path;
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// prepare props for next path
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$props = [];
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}
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$props[$row['propertyname']] = $row['propertyvalue'];
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}
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if (!is_null($oldPath)) {
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// save props from last run
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$this->cache[$oldPath] = $props;
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}
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$result->closeCursor();
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}
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}
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