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