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AbstractCustomPropertiesBackend.php
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AbstractCustomPropertiesBackend.php
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<?php
/**
* @author Thomas Müller <thomas.mueller@tmit.eu>
*
* @copyright Copyright (c) 2018, ownCloud GmbH
* @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\DAV;
use OCP\IDBConnection;
use OCP\IUser;
use Sabre\Dav\Exception\Forbidden;
use Sabre\DAV\Exception\NotFound;
use Sabre\DAV\Exception\ServiceUnavailable;
use Sabre\DAV\INode;
use Sabre\DAV\PropertyStorage\Backend\BackendInterface;
use Sabre\DAV\PropFind;
use Sabre\DAV\PropPatch;
use Sabre\DAV\Tree;
abstract class AbstractCustomPropertiesBackend implements BackendInterface {
/**
* Ignored properties
*
* @var array
*/
protected $ignoredProperties = [
'{DAV:}getcontentlength',
'{DAV:}getcontenttype',
'{DAV:}getetag',
'{DAV:}quota-used-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',
];
/**
* @var Tree
*/
protected $tree;
/**
* @var IDBConnection
*/
protected $connection;
/**
* @var string
*/
protected $user;
/**
* Property cache for the filesystem items
* @var array
*/
protected $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();
}
/**
* Returns a list of properties for these nodes
*
* @param string $path path
* @param INode $node
* @param array $requestedProperties requested properties or empty array for "all"
* @return array
* @note The properties list is a list of propertynames the client
* requested, encoded as xmlnamespace#tagName, for example:
* http://www.example.org/namespace#author If the array is empty, all
* properties should be returned
*/
abstract protected function getProperties($path, INode $node, array $requestedProperties);
/**
* Update properties
*
* @param string $path
* @param INode $node node for which to update properties
* @param array $changedProperties array of properties to update
* @return bool
*/
abstract protected function updateProperties($path, INode $node, $changedProperties);
/**
* Bulk load properties for children
*
* @param INode $node
* @param array $requestedProperties requested properties
*
* @return void
*/
abstract protected function loadChildrenProperties(INode $node, $requestedProperties);
/**
* This method is called after a node is deleted.
*
* @param string $path path of node for which to delete properties
*/
abstract public function delete($path);
/**
* @param string|int $key
* @return array|null
*/
protected function offsetGet($key) {
if (!isset($this->cache[$key])) {
return null;
}
return $this->cache[$key];
}
/**
* @param string|int $key
* @param array $value
*/
protected function offsetSet($key, $value) {
$this->cache[$key] = $value;
}
/**
* @param string|int $key
*/
protected function offsetUnset($key) {
unset($this->cache[$key]);
}
/**
* Fetches properties for a path.
*
* @param string $path
* @param PropFind $propFind
* @return void
*/
public function propFind($path, PropFind $propFind) {
$node = $this->getNodeForPath($path);
if ($node === null) {
return;
}
$requestedProps = $propFind->get404Properties();
// these might appear
$requestedProps = \array_diff(
$requestedProps,
$this->ignoredProperties
);
if (empty($requestedProps)) {
return;
}
if ($propFind->getDepth() !== 0) {
$this->loadChildrenProperties($node, $requestedProps);
}
$props = $this->getProperties($path, $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 = $this->getNodeForPath($path);
if ($node === null) {
return;
}
$propPatch->handleRemaining(function ($changedProps) use ($path, $node) {
return $this->updateProperties($path, $node, $changedProps);
});
}
/**
* @param string $sql
* @param array $whereValues
* @param array $whereTypes
* @return array
*/
protected function fetchProperties($sql, $whereValues, $whereTypes) {
$result = $this->connection->executeQuery(
$sql,
$whereValues,
$whereTypes
);
$props = [];
while ($row = $result->fetch()) {
$props[$row['propertyname']] = $row['propertyvalue'];
}
$result->closeCursor();
return $props;
}
/**
* @param string $path
* @return INode|null
*/
protected function getNodeForPath($path) {
try {
$node = $this->tree->getNodeForPath($path);
return $node;
} catch (ServiceUnavailable $e) {
// might happen for unavailable mount points, skip
} catch (Forbidden $e) {
// might happen for excluded mount points, skip
} 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}" : {message}',
[
'app' => 'dav',
'path' => $path,
'message' => $e->getMessage(),
]
);
}
return null;
}
}