nextcloud/apps/files_sharing/lib/sharedstorage.php

612 lines
18 KiB
PHP

<?php
/**
* ownCloud
*
* @author Bjoern Schiessle, Michael Gapczynski
* @copyright 2011 Michael Gapczynski <mtgap@owncloud.com>
* 2014 Bjoern Schiessle <schiessle@owncloud.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
* License as published by the Free Software Foundation; either
* version 3 of the License, or any later version.
*
* This library 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 along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\Files\Storage;
/**
* Convert target path to source path and pass the function call to the correct storage provider
*/
class Shared extends \OC\Files\Storage\Common {
private $share; // the shared resource
private $files = array();
public function __construct($arguments) {
$this->share = $arguments['share'];
}
/**
* get id of the mount point
* @return string
*/
public function getId() {
return 'shared::' . $this->getMountPoint();
}
/**
* get file cache of the shared item source
* @return string
*/
public function getSourceId() {
return $this->share['file_source'];
}
/**
* Get the source file path, permissions, and owner for a shared file
* @param string $target Shared target file path
* @return Returns array with the keys path, permissions, and owner or false if not found
*/
public function getFile($target) {
if (!isset($this->files[$target])) {
// Check for partial files
if (pathinfo($target, PATHINFO_EXTENSION) === 'part') {
$source = \OC_Share_Backend_File::getSource(substr($target, 0, -5), $this->getMountPoint(), $this->getItemType());
if ($source) {
$source['path'] .= '.part';
// All partial files have delete permission
$source['permissions'] |= \OCP\PERMISSION_DELETE;
}
} else {
$source = \OC_Share_Backend_File::getSource($target, $this->getMountPoint(), $this->getItemType());
}
$this->files[$target] = $source;
}
return $this->files[$target];
}
/**
* Get the source file path for a shared file
* @param string $target Shared target file path
* @return string source file path or false if not found
*/
public function getSourcePath($target) {
$source = $this->getFile($target);
if ($source) {
if (!isset($source['fullPath'])) {
\OC\Files\Filesystem::initMountPoints($source['fileOwner']);
$mount = \OC\Files\Filesystem::getMountByNumericId($source['storage']);
if (is_array($mount) && !empty($mount)) {
$this->files[$target]['fullPath'] = $mount[key($mount)]->getMountPoint() . $source['path'];
} else {
$this->files[$target]['fullPath'] = false;
\OCP\Util::writeLog('files_sharing', "Unable to get mount for shared storage '" . $source['storage'] . "' user '" . $source['fileOwner'] . "'", \OCP\Util::ERROR);
}
}
return $this->files[$target]['fullPath'];
}
return false;
}
/**
* Get the permissions granted for a shared file
* @param string $target Shared target file path
* @return int CRUDS permissions granted
*/
public function getPermissions($target = '') {
$permissions = $this->share['permissions'];
// part file are always have delete permissions
if (pathinfo($target, PATHINFO_EXTENSION) === 'part') {
$permissions |= \OCP\PERMISSION_DELETE;
}
if (\OC_Util::isSharingDisabledForUser()) {
$permissions &= ~\OCP\PERMISSION_SHARE;
}
return $permissions;
}
public function mkdir($path) {
if ($path == '' || $path == '/' || !$this->isCreatable(dirname($path))) {
return false;
} else if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->mkdir($internalPath);
}
return false;
}
public function rmdir($path) {
if (($source = $this->getSourcePath($path)) && $this->isDeletable($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->rmdir($internalPath);
}
return false;
}
public function opendir($path) {
$source = $this->getSourcePath($path);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->opendir($internalPath);
}
public function is_dir($path) {
$source = $this->getSourcePath($path);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->is_dir($internalPath);
}
public function is_file($path) {
if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->is_file($internalPath);
}
return false;
}
public function stat($path) {
if ($path == '' || $path == '/') {
$stat['size'] = $this->filesize($path);
$stat['mtime'] = $this->filemtime($path);
return $stat;
} else if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->stat($internalPath);
}
return false;
}
public function filetype($path) {
if ($path == '' || $path == '/') {
return 'dir';
} else if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->filetype($internalPath);
}
return false;
}
public function filesize($path) {
$source = $this->getSourcePath($path);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->filesize($internalPath);
}
public function isCreatable($path) {
return ($this->getPermissions($path) & \OCP\PERMISSION_CREATE);
}
public function isReadable($path) {
return $this->file_exists($path);
}
public function isUpdatable($path) {
return ($this->getPermissions($path) & \OCP\PERMISSION_UPDATE);
}
public function isDeletable($path) {
return ($this->getPermissions($path) & \OCP\PERMISSION_DELETE);
}
public function isSharable($path) {
if (\OCP\Util::isSharingDisabledForUser()) {
return false;
}
return ($this->getPermissions($path) & \OCP\PERMISSION_SHARE);
}
public function file_exists($path) {
if ($path == '' || $path == '/') {
return true;
} else if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->file_exists($internalPath);
}
return false;
}
public function filemtime($path) {
$source = $this->getSourcePath($path);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->filemtime($internalPath);
}
public function file_get_contents($path) {
$source = $this->getSourcePath($path);
if ($source) {
$info = array(
'target' => $this->getMountPoint() . $path,
'source' => $source,
);
\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'file_get_contents', $info);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->file_get_contents($internalPath);
}
}
public function file_put_contents($path, $data) {
if ($source = $this->getSourcePath($path)) {
// Check if permission is granted
if (($this->file_exists($path) && !$this->isUpdatable($path))
|| ($this->is_dir($path) && !$this->isCreatable($path))
) {
return false;
}
$info = array(
'target' => $this->getMountPoint() . '/' . $path,
'source' => $source,
);
\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'file_put_contents', $info);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
$result = $storage->file_put_contents($internalPath, $data);
return $result;
}
return false;
}
public function unlink($path) {
// Delete the file if DELETE permission is granted
$path = ($path === false) ? '' : $path;
if ($source = $this->getSourcePath($path)) {
if ($this->isDeletable($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->unlink($internalPath);
}
}
return false;
}
/**
* Format a path to be relative to the /user/files/ directory
* @param string $path the absolute path
* @return string e.g. turns '/admin/files/test.txt' into '/test.txt'
*/
private static function stripUserFilesPath($path) {
$trimmed = ltrim($path, '/');
$split = explode('/', $trimmed);
// it is not a file relative to data/user/files
if (count($split) < 3 || $split[1] !== 'files') {
\OCP\Util::writeLog('file sharing',
'Can not strip userid and "files/" from path: ' . $path,
\OCP\Util::DEBUG);
return false;
}
// skip 'user' and 'files'
$sliced = array_slice($split, 2);
$relPath = implode('/', $sliced);
return '/' . $relPath;
}
/**
* rename a shared folder/file
* @param string $sourcePath
* @param string $targetPath
* @return bool
*/
private function renameMountPoint($sourcePath, $targetPath) {
// it shouldn't be possible to move a Shared storage into another one
list($targetStorage, ) = \OC\Files\Filesystem::resolvePath($targetPath);
if ($targetStorage->instanceOfStorage('\OC\Files\Storage\Shared')) {
\OCP\Util::writeLog('file sharing',
'It is not allowed to move one mount point into another one',
\OCP\Util::DEBUG);
return false;
}
$relTargetPath = $this->stripUserFilesPath($targetPath);
if ($relTargetPath === false) {
\OCP\Util::writeLog('file sharing', 'Wrong target path given: ' . $targetPath, \OCP\Util::ERROR);
return false;
}
$result = self::updateFileTarget($relTargetPath, $this->share);
if ($result) {
// update the mount manager with the new paths
$mountManager = \OC\Files\Filesystem::getMountManager();
$mount = $mountManager->find($sourcePath);
$mount->setMountPoint($targetPath . '/');
$mountManager->addMount($mount);
$mountManager->removeMount($sourcePath . '/');
$this->setUniqueName();
$this->setMountPoint($relTargetPath);
} else {
\OCP\Util::writeLog('file sharing',
'Could not rename mount point for shared folder "' . $sourcePath . '" to "' . $targetPath . '"',
\OCP\Util::ERROR);
}
return (bool)$result;
}
/**
* @update fileTarget in the database if the mount point changed
* @param string $newPath
* @param array $share reference to the share which should be modified
* @return type
*/
private static function updateFileTarget($newPath, &$share) {
// if the user renames a mount point from a group share we need to create a new db entry
// for the unique name
if ($share['share_type'] === \OCP\Share::SHARE_TYPE_GROUP &&
(isset($share['unique_name']) && $share['unique_name'])) {
$query = \OC_DB::prepare('INSERT INTO `*PREFIX*share` (`item_type`, `item_source`, `item_target`,'
.' `share_type`, `share_with`, `uid_owner`, `permissions`, `stime`, `file_source`,'
.' `file_target`, `token`, `parent`) VALUES (?,?,?,?,?,?,?,?,?,?,?,?)');
$arguments = array($share['item_type'], $share['item_source'], $share['item_target'],
2, \OCP\User::getUser(), $share['uid_owner'], $share['permissions'], $share['stime'], $share['file_source'],
$newPath, $share['token'], $share['id']);
} else {
// rename mount point
$query = \OC_DB::prepare(
'Update `*PREFIX*share`
SET `file_target` = ?
WHERE `id` = ?'
);
$arguments = array($newPath, $share['id']);
}
return $query->execute($arguments);
}
public function rename($path1, $path2) {
$sourceMountPoint = \OC\Files\Filesystem::getMountPoint($path1);
$targetMountPoint = \OC\Files\Filesystem::getMountPoint($path2);
$relPath1 = \OCA\Files_Sharing\Helper::stripUserFilesPath($path1);
$relPath2 = \OCA\Files_Sharing\Helper::stripUserFilesPath($path2);
// if we renamed the mount point we need to adjust the file_target in the
// database
if (\OC\Files\Filesystem::normalizePath($sourceMountPoint) === \OC\Files\Filesystem::normalizePath($path1)) {
return $this->renameMountPoint($path1, $path2);
}
if ( // Within the same mount point, we only need UPDATE permissions
($sourceMountPoint === $targetMountPoint && $this->isUpdatable($sourceMountPoint)) ||
// otherwise DELETE and CREATE permissions required
($this->isDeletable($path1) && $this->isCreatable(dirname($path2)))) {
$pathinfo = pathinfo($relPath1);
// for part files we need to ask for the owner and path from the parent directory because
// the file cache doesn't return any results for part files
if ($pathinfo['extension'] === 'part') {
list($user1, $path1) = \OCA\Files_Sharing\Helper::getUidAndFilename($pathinfo['dirname']);
$path1 = $path1 . '/' . $pathinfo['basename'];
} else {
list($user1, $path1) = \OCA\Files_Sharing\Helper::getUidAndFilename($relPath1);
}
$targetFilename = basename($relPath2);
list($user2, $path2) = \OCA\Files_Sharing\Helper::getUidAndFilename(dirname($relPath2));
$rootView = new \OC\Files\View('');
return $rootView->rename('/' . $user1 . '/files/' . $path1, '/' . $user2 . '/files/' . $path2 . '/' . $targetFilename);
}
return false;
}
public function copy($path1, $path2) {
// Copy the file if CREATE permission is granted
if ($this->isCreatable(dirname($path2))) {
$oldSource = $this->getSourcePath($path1);
$newSource = $this->getSourcePath(dirname($path2)) . '/' . basename($path2);
$rootView = new \OC\Files\View('');
return $rootView->copy($oldSource, $newSource);
}
return false;
}
public function fopen($path, $mode) {
if ($source = $this->getSourcePath($path)) {
switch ($mode) {
case 'r+':
case 'rb+':
case 'w+':
case 'wb+':
case 'x+':
case 'xb+':
case 'a+':
case 'ab+':
case 'w':
case 'wb':
case 'x':
case 'xb':
case 'a':
case 'ab':
$exists = $this->file_exists($path);
if ($exists && !$this->isUpdatable($path)) {
return false;
}
if (!$exists && !$this->isCreatable(dirname($path))) {
return false;
}
}
$info = array(
'target' => $this->getMountPoint() . $path,
'source' => $source,
'mode' => $mode,
);
\OCP\Util::emitHook('\OC\Files\Storage\Shared', 'fopen', $info);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->fopen($internalPath, $mode);
}
return false;
}
public function getMimeType($path) {
if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->getMimeType($internalPath);
}
return false;
}
public function free_space($path) {
$source = $this->getSourcePath($path);
if ($source) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->free_space($internalPath);
}
return \OC\Files\SPACE_UNKNOWN;
}
public function getLocalFile($path) {
if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->getLocalFile($internalPath);
}
return false;
}
public function touch($path, $mtime = null) {
if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->touch($internalPath, $mtime);
}
return false;
}
public static function setup($options) {
$shares = \OCP\Share::getItemsSharedWith('file');
if (!\OCP\User::isLoggedIn() || \OCP\User::getUser() != $options['user']
|| $shares
) {
foreach ($shares as $share) {
self::verifyMountPoint($share);
\OC\Files\Filesystem::mount('\OC\Files\Storage\Shared',
array(
'share' => $share,
),
$options['user_dir'] . '/' . $share['file_target']);
}
}
}
/**
* check if the parent folder exists otherwise move the mount point up
*
* @param array $share reference to the share we want to check
*/
private static function verifyMountPoint(&$share) {
$mountPoint = basename($share['file_target']);
$parent = dirname($share['file_target']);
while (!\OC\Files\Filesystem::is_dir($parent)) {
$parent = dirname($parent);
}
$newMountPoint = \OCA\Files_Sharing\Helper::generateUniqueTarget(
\OC\Files\Filesystem::normalizePath($parent . '/' . $mountPoint),
array(),
new \OC\Files\View('/' . \OCP\User::getUser() . '/files')
);
if($newMountPoint !== $share['file_target']) {
self::updateFileTarget($newMountPoint, $share);
$share['file_target'] = $newMountPoint;
}
}
/**
* return mount point of share, relative to data/user/files
*
* @return string
*/
public function getMountPoint() {
return $this->share['file_target'];
}
private function setMountPoint($path) {
$this->share['file_target'] = $path;
}
/**
* the share now uses a unique name of this user
*
* @brief the share now uses a unique name of this user
*/
private function setUniqueName() {
$this->share['unique_name'] = true;
}
/**
* @brief get the user who shared the file
*
* @return string
*/
public function getSharedFrom() {
return $this->share['uid_owner'];
}
/**
* return share type, can be "file" or "folder"
* @return string
*/
public function getItemType() {
return $this->share['item_type'];
}
public function hasUpdated($path, $time) {
return $this->filemtime($path) > $time;
}
public function getCache($path = '') {
return new \OC\Files\Cache\Shared_Cache($this);
}
public function getScanner($path = '') {
return new \OC\Files\Cache\Scanner($this);
}
public function getPermissionsCache($path = '') {
return new \OC\Files\Cache\Shared_Permissions($this);
}
public function getWatcher($path = '') {
return new \OC\Files\Cache\Shared_Watcher($this);
}
public function getOwner($path) {
if ($path == '') {
$path = $this->getMountPoint();
}
$source = $this->getFile($path);
if ($source) {
return $source['fileOwner'];
}
return false;
}
public function getETag($path) {
if ($path == '') {
$path = $this->getMountPoint();
}
if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->getETag($internalPath);
}
return null;
}
}