nextcloud/apps/files_sharing/lib/external/storage.php

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<?php
/**
* Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Affero General Public License version 3 or
* later.
* See the COPYING-README file.
*/
namespace OCA\Files_Sharing\External;
use OC\Files\Filesystem;
use OC\Files\Storage\DAV;
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use OC\ForbiddenException;
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use OCA\Files_Sharing\ISharedStorage;
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use OCP\Files\NotFoundException;
use OCP\Files\StorageInvalidException;
use OCP\Files\StorageNotAvailableException;
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class Storage extends DAV implements ISharedStorage {
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/**
* @var string
*/
private $remoteUser;
/**
* @var string
*/
private $remote;
/**
* @var string
*/
private $mountPoint;
/**
* @var string
*/
private $token;
/**
* @var \OCP\ICertificateManager
*/
private $certificateManager;
private $updateChecked = false;
/**
* @var \OCA\Files_Sharing\External\Manager
*/
private $manager;
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public function __construct($options) {
$this->manager = $options['manager'];
$this->certificateManager = $options['certificateManager'];
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$this->remote = $options['remote'];
$this->remoteUser = $options['owner'];
list($protocol, $remote) = explode('://', $this->remote);
if (strpos($remote, '/')) {
list($host, $root) = explode('/', $remote, 2);
} else {
$host = $remote;
$root = '';
}
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$secure = $protocol === 'https';
$root = rtrim($root, '/') . '/public.php/webdav';
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$this->mountPoint = $options['mountpoint'];
$this->token = $options['token'];
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parent::__construct(array(
'secure' => $secure,
'host' => $host,
'root' => $root,
'user' => $options['token'],
'password' => $options['password']
));
}
public function getRemoteUser() {
return $this->remoteUser;
}
public function getRemote() {
return $this->remote;
}
public function getMountPoint() {
return $this->mountPoint;
}
public function getToken() {
return $this->token;
}
public function getPassword() {
return $this->password;
}
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/**
* @brief get id of the mount point
* @return string
*/
public function getId() {
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return 'shared::' . md5($this->token . '@' . $this->remote);
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}
public function getCache($path = '', $storage = null) {
if (!$storage) {
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$this->cache = new Cache($this, $this->remote, $this->remoteUser);
}
return $this->cache;
}
/**
* @param string $path
* @param \OC\Files\Storage\Storage $storage
* @return \OCA\Files_Sharing\External\Scanner
*/
public function getScanner($path = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
if (!isset($this->scanner)) {
$this->scanner = new Scanner($storage);
}
return $this->scanner;
}
/**
* check if a file or folder has been updated since $time
*
* @param string $path
* @param int $time
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* @throws \OCP\Files\StorageNotAvailableException
* @throws \OCP\Files\StorageInvalidException
* @return bool
*/
public function hasUpdated($path, $time) {
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// since for owncloud webdav servers we can rely on etag propagation we only need to check the root of the storage
// because of that we only do one check for the entire storage per request
if ($this->updateChecked) {
return false;
}
$this->updateChecked = true;
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try {
return parent::hasUpdated('', $time);
} catch (StorageNotAvailableException $e) {
// see if we can find out why the share is unavailable\
try {
$this->getShareInfo();
} catch (NotFoundException $shareException) {
// a 404 can either mean that the share no longer exists or there is no ownCloud on the remote
if ($this->testRemote()) {
// valid ownCloud instance means that the public share no longer exists
// since this is permanent (re-sharing the file will create a new token)
// we remove the invalid storage
$this->manager->removeShare($this->mountPoint);
$this->manager->getMountManager()->removeMount($this->mountPoint);
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throw new StorageInvalidException();
} else {
// ownCloud instance is gone, likely to be a temporary server configuration error
throw $e;
}
} catch (\Exception $shareException) {
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// todo, maybe handle 403 better and ask the user for a new password
throw $e;
}
throw $e;
}
}
/**
* check if the configured remote is a valid ownCloud instance
*
* @return bool
*/
protected function testRemote() {
try {
$result = file_get_contents($this->remote . '/status.php');
$data = json_decode($result);
return is_object($data) and !empty($data->version);
} catch (\Exception $e) {
return false;
}
}
public function getShareInfo() {
$remote = $this->getRemote();
$token = $this->getToken();
$password = $this->getPassword();
$url = $remote . '/index.php/apps/files_sharing/shareinfo?t=' . $token;
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS,
http_build_query(array('password' => $password)));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_CAINFO, $this->certificateManager->getCertificateBundle());
$result = curl_exec($ch);
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$status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
switch ($status) {
case 401:
case 403:
throw new ForbiddenException();
case 404:
throw new NotFoundException();
case 500:
throw new \Exception();
}
return json_decode($result, true);
}
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}