nextcloud/lib/private/files/storage/dav.php

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<?php
/**
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* @author Alexander Bogdanov <syn@li.ru>
* @author Bart Visscher <bartv@thisnet.nl>
* @author Björn Schießle <schiessle@owncloud.com>
* @author Carlos Cerrillo <ccerrillo@gmail.com>
* @author Felix Moeller <mail@felixmoeller.de>
* @author Jörn Friedrich Dreyer <jfd@butonic.de>
* @author Lukas Reschke <lukas@owncloud.com>
* @author Michael Gapczynski <GapczynskiM@gmail.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Philippe Kueck <pk@plusline.de>
* @author Philipp Kapfer <philipp.kapfer@gmx.at>
* @author Robin Appelman <icewind@owncloud.com>
* @author Scrutinizer Auto-Fixer <auto-fixer@scrutinizer-ci.com>
* @author Thomas Müller <thomas.mueller@tmit.eu>
* @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/>
*
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*/
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namespace OC\Files\Storage;
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use Exception;
use OC\Files\Filesystem;
use OC\Files\Stream\Close;
use Icewind\Streams\IteratorDirectory;
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use OC\MemCache\ArrayCache;
use OCP\Constants;
use OCP\Files;
use OCP\Files\FileInfo;
use OCP\Files\StorageInvalidException;
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use OCP\Files\StorageNotAvailableException;
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use OCP\Util;
use Sabre\DAV\Client;
use Sabre\DAV\Exception\NotFound;
use Sabre\HTTP\ClientException;
use Sabre\HTTP\ClientHttpException;
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/**
* Class DAV
*
* @package OC\Files\Storage
*/
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class DAV extends Common {
/** @var string */
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protected $password;
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/** @var string */
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protected $user;
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/** @var string */
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protected $host;
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/** @var bool */
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protected $secure;
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/** @var string */
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protected $root;
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/** @var string */
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protected $certPath;
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/** @var bool */
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protected $ready;
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/** @var Client */
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private $client;
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/** @var ArrayCache */
private $statCache;
/** @var array */
private static $tempFiles = [];
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/**
* @param array $params
* @throws \Exception
*/
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public function __construct($params) {
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$this->statCache = new ArrayCache();
if (isset($params['host']) && isset($params['user']) && isset($params['password'])) {
$host = $params['host'];
//remove leading http[s], will be generated in createBaseUri()
if (substr($host, 0, 8) == "https://") $host = substr($host, 8);
else if (substr($host, 0, 7) == "http://") $host = substr($host, 7);
$this->host = $host;
$this->user = $params['user'];
$this->password = $params['password'];
if (isset($params['secure'])) {
if (is_string($params['secure'])) {
$this->secure = ($params['secure'] === 'true');
} else {
$this->secure = (bool)$params['secure'];
}
} else {
$this->secure = false;
}
if ($this->secure === true) {
$certPath = \OC_User::getHome(\OC_User::getUser()) . '/files_external/rootcerts.crt';
if (file_exists($certPath)) {
$this->certPath = $certPath;
}
}
$this->root = isset($params['root']) ? $params['root'] : '/';
if (!$this->root || $this->root[0] != '/') {
$this->root = '/' . $this->root;
}
if (substr($this->root, -1, 1) != '/') {
$this->root .= '/';
}
} else {
throw new \Exception('Invalid webdav storage configuration');
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}
}
private function init() {
if ($this->ready) {
return;
}
$this->ready = true;
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$settings = array(
'baseUri' => $this->createBaseUri(),
'userName' => $this->user,
'password' => $this->password,
);
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$this->client = new Client($settings);
$this->client->setThrowExceptions(true);
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if ($this->secure === true && $this->certPath) {
$this->client->addTrustedCertificates($this->certPath);
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}
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}
/**
* Clear the stat cache
*/
public function clearStatCache() {
$this->statCache->clear();
}
/** {@inheritdoc} */
public function getId() {
return 'webdav::' . $this->user . '@' . $this->host . '/' . $this->root;
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}
/** {@inheritdoc} */
public function createBaseUri() {
$baseUri = 'http';
if ($this->secure) {
$baseUri .= 's';
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}
$baseUri .= '://' . $this->host . $this->root;
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return $baseUri;
}
/** {@inheritdoc} */
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public function mkdir($path) {
$this->init();
$path = $this->cleanPath($path);
$result = $this->simpleResponse('MKCOL', $path, null, 201);
if ($result) {
$this->statCache->set($path, true);
}
return $result;
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}
/** {@inheritdoc} */
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public function rmdir($path) {
$this->init();
$path = $this->cleanPath($path);
// FIXME: some WebDAV impl return 403 when trying to DELETE
// a non-empty folder
$result = $this->simpleResponse('DELETE', $path . '/', null, 204);
$this->statCache->clear($path . '/');
$this->statCache->remove($path);
return $result;
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}
/** {@inheritdoc} */
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public function opendir($path) {
$this->init();
$path = $this->cleanPath($path);
try {
$response = $this->client->propfind(
$this->encodePath($path),
array(),
1
);
$id = md5('webdav' . $this->root . $path);
$content = array();
$files = array_keys($response);
array_shift($files); //the first entry is the current directory
if (!$this->statCache->hasKey($path)) {
$this->statCache->set($path, true);
}
foreach ($files as $file) {
$file = urldecode($file);
// do not store the real entry, we might not have all properties
if (!$this->statCache->hasKey($path)) {
$this->statCache->set($file, true);
}
$file = basename($file);
$content[] = $file;
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}
return IteratorDirectory::wrap($content);
} catch (ClientHttpException $e) {
if ($e->getHttpStatus() === 404) {
$this->statCache->clear($path . '/');
$this->statCache->set($path, false);
return false;
}
$this->convertException($e, $path);
} catch (\Exception $e) {
$this->convertException($e, $path);
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}
return false;
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}
/**
* Propfind call with cache handling.
*
* First checks if information is cached.
* If not, request it from the server then store to cache.
*
* @param string $path path to propfind
*
* @return array propfind response
*
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* @throws NotFound
*/
private function propfind($path) {
$path = $this->cleanPath($path);
$cachedResponse = $this->statCache->get($path);
if ($cachedResponse === false) {
// we know it didn't exist
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throw new NotFound();
}
// we either don't know it, or we know it exists but need more details
if (is_null($cachedResponse) || $cachedResponse === true) {
$this->init();
try {
$response = $this->client->propfind(
$this->encodePath($path),
array(
'{DAV:}getlastmodified',
'{DAV:}getcontentlength',
'{DAV:}getcontenttype',
'{http://owncloud.org/ns}permissions',
'{DAV:}resourcetype',
'{DAV:}getetag',
)
);
$this->statCache->set($path, $response);
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} catch (NotFound $e) {
// remember that this path did not exist
$this->statCache->clear($path . '/');
$this->statCache->set($path, false);
throw $e;
}
} else {
$response = $cachedResponse;
}
return $response;
}
/** {@inheritdoc} */
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public function filetype($path) {
try {
$response = $this->propfind($path);
$responseType = array();
if (isset($response["{DAV:}resourcetype"])) {
$responseType = $response["{DAV:}resourcetype"]->resourceType;
}
return (count($responseType) > 0 and $responseType[0] == "{DAV:}collection") ? 'dir' : 'file';
} catch (ClientHttpException $e) {
if ($e->getHttpStatus() === 404) {
return false;
}
$this->convertException($e, $path);
} catch (\Exception $e) {
$this->convertException($e, $path);
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}
return false;
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}
/** {@inheritdoc} */
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public function file_exists($path) {
try {
$path = $this->cleanPath($path);
$cachedState = $this->statCache->get($path);
if ($cachedState === false) {
// we know the file doesn't exist
return false;
} else if (!is_null($cachedState)) {
return true;
}
// need to get from server
$this->propfind($path);
return true; //no 404 exception
} catch (ClientHttpException $e) {
if ($e->getHttpStatus() === 404) {
return false;
}
$this->convertException($e, $path);
} catch (\Exception $e) {
$this->convertException($e, $path);
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}
return false;
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}
/** {@inheritdoc} */
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public function unlink($path) {
$this->init();
$path = $this->cleanPath($path);
$result = $this->simpleResponse('DELETE', $path, null, 204);
$this->statCache->clear($path . '/');
$this->statCache->remove($path);
return $result;
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}
/** {@inheritdoc} */
public function fopen($path, $mode) {
$this->init();
$path = $this->cleanPath($path);
switch ($mode) {
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case 'r':
case 'rb':
if (!$this->file_exists($path)) {
return false;
}
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//straight up curl instead of sabredav here, sabredav put's the entire get result in memory
$curl = curl_init();
$fp = fopen('php://temp', 'r+');
curl_setopt($curl, CURLOPT_USERPWD, $this->user . ':' . $this->password);
curl_setopt($curl, CURLOPT_URL, $this->createBaseUri() . $this->encodePath($path));
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curl_setopt($curl, CURLOPT_FILE, $fp);
curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
if(defined('CURLOPT_PROTOCOLS')) {
curl_setopt($curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
}
if(defined('CURLOPT_REDIR_PROTOCOLS')) {
curl_setopt($curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
}
if ($this->secure === true) {
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
if ($this->certPath) {
curl_setopt($curl, CURLOPT_CAINFO, $this->certPath);
}
}
curl_exec($curl);
$statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($statusCode !== 200) {
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Util::writeLog("webdav client", 'curl GET ' . curl_getinfo($curl, CURLINFO_EFFECTIVE_URL) . ' returned status code ' . $statusCode, Util::ERROR);
if ($statusCode === 423) {
throw new \OCP\Lock\LockedException($path);
}
}
curl_close($curl);
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rewind($fp);
return $fp;
case 'w':
case 'wb':
case 'a':
case 'ab':
case 'r+':
case 'w+':
case 'wb+':
case 'a+':
case 'x':
case 'x+':
case 'c':
case 'c+':
//emulate these
if (strrpos($path, '.') !== false) {
$ext = substr($path, strrpos($path, '.'));
} else {
$ext = '';
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}
if ($this->file_exists($path)) {
if (!$this->isUpdatable($path)) {
return false;
}
$tmpFile = $this->getCachedFile($path);
} else {
if (!$this->isCreatable(dirname($path))) {
return false;
}
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$tmpFile = Files::tmpFile($ext);
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}
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Close::registerCallback($tmpFile, array($this, 'writeBack'));
self::$tempFiles[$tmpFile] = $path;
return fopen('close://' . $tmpFile, $mode);
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}
}
/**
* @param string $tmpFile
*/
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public function writeBack($tmpFile) {
if (isset(self::$tempFiles[$tmpFile])) {
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$this->uploadFile($tmpFile, self::$tempFiles[$tmpFile]);
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unlink($tmpFile);
}
}
/** {@inheritdoc} */
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public function free_space($path) {
$this->init();
$path = $this->cleanPath($path);
try {
// TODO: cacheable ?
$response = $this->client->propfind($this->encodePath($path), array('{DAV:}quota-available-bytes'));
if (isset($response['{DAV:}quota-available-bytes'])) {
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return (int)$response['{DAV:}quota-available-bytes'];
} else {
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return FileInfo::SPACE_UNKNOWN;
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}
} catch (\Exception $e) {
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return FileInfo::SPACE_UNKNOWN;
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}
}
/** {@inheritdoc} */
public function touch($path, $mtime = null) {
$this->init();
if (is_null($mtime)) {
$mtime = time();
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}
$path = $this->cleanPath($path);
// if file exists, update the mtime, else create a new empty file
if ($this->file_exists($path)) {
try {
$this->statCache->remove($path);
$this->client->proppatch($this->encodePath($path), array('{DAV:}lastmodified' => $mtime));
} catch (ClientHttpException $e) {
if ($e->getHttpStatus() === 501) {
return false;
}
$this->convertException($e, $path);
return false;
} catch (\Exception $e) {
$this->convertException($e, $path);
return false;
}
} else {
$this->file_put_contents($path, '');
}
return true;
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}
/**
* @param string $path
* @param string $data
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* @return int
*/
public function file_put_contents($path, $data) {
$path = $this->cleanPath($path);
$result = parent::file_put_contents($path, $data);
$this->statCache->remove($path);
return $result;
}
/**
* @param string $path
* @param string $target
*/
protected function uploadFile($path, $target) {
$this->init();
// invalidate
$target = $this->cleanPath($target);
$this->statCache->remove($target);
$source = fopen($path, 'r');
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$curl = curl_init();
curl_setopt($curl, CURLOPT_USERPWD, $this->user . ':' . $this->password);
curl_setopt($curl, CURLOPT_URL, $this->createBaseUri() . $this->encodePath($target));
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curl_setopt($curl, CURLOPT_BINARYTRANSFER, true);
curl_setopt($curl, CURLOPT_INFILE, $source); // file pointer
curl_setopt($curl, CURLOPT_INFILESIZE, filesize($path));
curl_setopt($curl, CURLOPT_PUT, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
curl_setopt($curl, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS);
if ($this->secure === true) {
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
if ($this->certPath) {
curl_setopt($curl, CURLOPT_CAINFO, $this->certPath);
}
}
curl_exec($curl);
$statusCode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
if ($statusCode !== 200) {
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Util::writeLog("webdav client", 'curl GET ' . curl_getinfo($curl, CURLINFO_EFFECTIVE_URL) . ' returned status code ' . $statusCode, Util::ERROR);
if ($statusCode === 423) {
throw new \OCP\Lock\LockedException($path);
}
}
curl_close($curl);
fclose($source);
$this->removeCachedFile($target);
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}
/** {@inheritdoc} */
public function rename($path1, $path2) {
$this->init();
$path1 = $this->cleanPath($path1);
$path2 = $this->cleanPath($path2);
try {
$this->client->request(
'MOVE',
$this->encodePath($path1),
null,
array(
'Destination' => $this->createBaseUri() . $this->encodePath($path2)
)
);
$this->statCache->clear($path1 . '/');
$this->statCache->clear($path2 . '/');
$this->statCache->set($path1, false);
$this->statCache->set($path2, true);
$this->removeCachedFile($path1);
$this->removeCachedFile($path2);
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return true;
} catch (\Exception $e) {
$this->convertException($e);
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}
return false;
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}
/** {@inheritdoc} */
public function copy($path1, $path2) {
$this->init();
$path1 = $this->encodePath($this->cleanPath($path1));
$path2 = $this->createBaseUri() . $this->encodePath($this->cleanPath($path2));
try {
$this->client->request('COPY', $path1, null, array('Destination' => $path2));
$this->statCache->clear($path2 . '/');
$this->statCache->set($path2, true);
$this->removeCachedFile($path2);
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return true;
} catch (\Exception $e) {
$this->convertException($e);
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}
return false;
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}
/** {@inheritdoc} */
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public function stat($path) {
try {
$response = $this->propfind($path);
return array(
'mtime' => strtotime($response['{DAV:}getlastmodified']),
'size' => (int)isset($response['{DAV:}getcontentlength']) ? $response['{DAV:}getcontentlength'] : 0,
);
} catch (ClientHttpException $e) {
if ($e->getHttpStatus() === 404) {
return array();
}
$this->convertException($e, $path);
} catch (\Exception $e) {
$this->convertException($e, $path);
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}
return array();
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}
/** {@inheritdoc} */
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public function getMimeType($path) {
try {
$response = $this->propfind($path);
$responseType = array();
if (isset($response["{DAV:}resourcetype"])) {
$responseType = $response["{DAV:}resourcetype"]->resourceType;
}
$type = (count($responseType) > 0 and $responseType[0] == "{DAV:}collection") ? 'dir' : 'file';
if ($type == 'dir') {
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return 'httpd/unix-directory';
} elseif (isset($response['{DAV:}getcontenttype'])) {
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return $response['{DAV:}getcontenttype'];
} else {
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return false;
}
} catch (ClientHttpException $e) {
if ($e->getHttpStatus() === 404) {
return false;
}
$this->convertException($e, $path);
} catch (\Exception $e) {
$this->convertException($e, $path);
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}
return false;
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}
/**
* @param string $path
* @return string
*/
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public function cleanPath($path) {
if ($path === '') {
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return $path;
}
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$path = Filesystem::normalizePath($path);
// remove leading slash
return substr($path, 1);
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}
/**
* URL encodes the given path but keeps the slashes
*
* @param string $path to encode
* @return string encoded path
*/
private function encodePath($path) {
// slashes need to stay
return str_replace('%2F', '/', rawurlencode($path));
}
/**
* @param string $method
* @param string $path
* @param string|resource|null $body
* @param int $expected
* @return bool
* @throws StorageInvalidException
* @throws StorageNotAvailableException
*/
private function simpleResponse($method, $path, $body, $expected) {
$path = $this->cleanPath($path);
try {
$response = $this->client->request($method, $this->encodePath($path), $body);
return $response['statusCode'] == $expected;
} catch (ClientHttpException $e) {
if ($e->getHttpStatus() === 404 && $method === 'DELETE') {
$this->statCache->clear($path . '/');
$this->statCache->set($path, false);
return false;
}
$this->convertException($e, $path);
} catch (\Exception $e) {
$this->convertException($e, $path);
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}
return false;
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}
/**
* check if curl is installed
*/
public static function checkDependencies() {
return true;
}
/** {@inheritdoc} */
public function isUpdatable($path) {
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return (bool)($this->getPermissions($path) & Constants::PERMISSION_UPDATE);
}
/** {@inheritdoc} */
public function isCreatable($path) {
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return (bool)($this->getPermissions($path) & Constants::PERMISSION_CREATE);
}
/** {@inheritdoc} */
public function isSharable($path) {
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return (bool)($this->getPermissions($path) & Constants::PERMISSION_SHARE);
}
/** {@inheritdoc} */
public function isDeletable($path) {
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return (bool)($this->getPermissions($path) & Constants::PERMISSION_DELETE);
}
/** {@inheritdoc} */
public function getPermissions($path) {
$this->init();
$path = $this->cleanPath($path);
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$response = $this->propfind($path);
if (isset($response['{http://owncloud.org/ns}permissions'])) {
return $this->parsePermissions($response['{http://owncloud.org/ns}permissions']);
} else if ($this->is_dir($path)) {
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return Constants::PERMISSION_ALL;
} else if ($this->file_exists($path)) {
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return Constants::PERMISSION_ALL - Constants::PERMISSION_CREATE;
} else {
return 0;
}
}
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/** {@inheritdoc} */
public function getETag($path) {
$this->init();
$path = $this->cleanPath($path);
$response = $this->propfind($path);
if (isset($response['{DAV:}getetag'])) {
return trim($response['{DAV:}getetag'], '"');
}
return parent::getEtag($path);
}
/**
* @param string $permissionsString
* @return int
*/
protected function parsePermissions($permissionsString) {
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$permissions = Constants::PERMISSION_READ;
if (strpos($permissionsString, 'R') !== false) {
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$permissions |= Constants::PERMISSION_SHARE;
}
if (strpos($permissionsString, 'D') !== false) {
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$permissions |= Constants::PERMISSION_DELETE;
}
if (strpos($permissionsString, 'W') !== false) {
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$permissions |= Constants::PERMISSION_UPDATE;
}
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if (strpos($permissionsString, 'CK') !== false) {
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$permissions |= Constants::PERMISSION_CREATE;
$permissions |= Constants::PERMISSION_UPDATE;
}
return $permissions;
}
/**
* check if a file or folder has been updated since $time
*
* @param string $path
* @param int $time
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* @throws \OCP\Files\StorageNotAvailableException
* @return bool
*/
public function hasUpdated($path, $time) {
$this->init();
$path = $this->cleanPath($path);
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try {
// force refresh for $path
$this->statCache->remove($path);
$response = $this->propfind($path);
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if (isset($response['{DAV:}getetag'])) {
$cachedData = $this->getCache()->get($path);
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$etag = null;
if (isset($response['{DAV:}getetag'])) {
$etag = trim($response['{DAV:}getetag'], '"');
}
if (!empty($etag) && $cachedData['etag'] !== $etag) {
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return true;
} else if (isset($response['{http://owncloud.org/ns}permissions'])) {
$permissions = $this->parsePermissions($response['{http://owncloud.org/ns}permissions']);
return $permissions !== $cachedData['permissions'];
} else {
return false;
}
} else {
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$remoteMtime = strtotime($response['{DAV:}getlastmodified']);
return $remoteMtime > $time;
}
} catch (ClientHttpException $e) {
if ($e->getHttpStatus() === 404 || $e->getHttpStatus() === 405) {
if ($path === '') {
// if root is gone it means the storage is not available
throw new StorageNotAvailableException(get_class($e).': '.$e->getMessage());
}
return false;
}
$this->convertException($e, $path);
return false;
} catch (\Exception $e) {
$this->convertException($e, $path);
return false;
}
}
/**
* Interpret the given exception and decide whether it is due to an
* unavailable storage, invalid storage or other.
* This will either throw StorageInvalidException, StorageNotAvailableException
* or do nothing.
*
* @param Exception $e sabre exception
* @param string $path optional path from the operation
*
* @throws StorageInvalidException if the storage is invalid, for example
* when the authentication expired or is invalid
* @throws StorageNotAvailableException if the storage is not available,
* which might be temporary
*/
private function convertException(Exception $e, $path = '') {
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Util::writeLog('files_external', $e->getMessage(), Util::ERROR);
if ($e instanceof ClientHttpException) {
if ($e->getHttpStatus() === 423) {
throw new \OCP\Lock\LockedException($path);
}
if ($e->getHttpStatus() === 401) {
// either password was changed or was invalid all along
throw new StorageInvalidException(get_class($e).': '.$e->getMessage());
} else if ($e->getHttpStatus() === 405) {
// ignore exception for MethodNotAllowed, false will be returned
return;
}
throw new StorageNotAvailableException(get_class($e).': '.$e->getMessage());
} else if ($e instanceof ClientException) {
// connection timeout or refused, server could be temporarily down
throw new StorageNotAvailableException(get_class($e).': '.$e->getMessage());
} else if ($e instanceof \InvalidArgumentException) {
// parse error because the server returned HTML instead of XML,
// possibly temporarily down
throw new StorageNotAvailableException(get_class($e).': '.$e->getMessage());
} else if (($e instanceof StorageNotAvailableException) || ($e instanceof StorageInvalidException)) {
// rethrow
throw $e;
}
// TODO: only log for now, but in the future need to wrap/rethrow exception
}
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}