nextcloud/apps/files_sharing/lib/sharedstorage.php

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<?php
/**
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* @author Bart Visscher <bartv@thisnet.nl>
* @author Björn Schießle <schiessle@owncloud.com>
* @author Joas Schilling <nickvergessen@owncloud.com>
* @author Michael Gapczynski <GapczynskiM@gmail.com>
* @author Morris Jobke <hey@morrisjobke.de>
* @author Robin Appelman <icewind@owncloud.com>
* @author Robin McCorkell <rmccorkell@karoshi.org.uk>
* @author scambra <sergio@entrecables.com>
* @author Vincent Petry <pvince81@owncloud.com>
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*
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* @copyright Copyright (c) 2015, ownCloud, Inc.
* @license AGPL-3.0
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*
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* 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.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
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*
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* 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;
use OC\Files\Cache\ChangePropagator;
use OC\Files\Filesystem;
use OC\Files\View;
use OCA\Files_Sharing\ISharedStorage;
use OCA\Files_Sharing\Propagator;
use OCA\Files_Sharing\SharedMount;
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/**
* Convert target path to source path and pass the function call to the correct storage provider
*/
class Shared extends \OC\Files\Storage\Common implements ISharedStorage {
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private $share; // the shared resource
private $files = array();
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private static $isInitialized = array();
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public function __construct($arguments) {
$this->share = $arguments['share'];
}
/**
* get id of the mount point
*
* @return string
*/
public function getId() {
return 'shared::' . $this->getMountPoint();
}
/**
* get file cache of the shared item source
*
* @return int
*/
public function getSourceId() {
return (int)$this->share['file_source'];
}
/**
* Get the source file path, permissions, and owner for a shared file
*
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* @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\Constants::PERMISSION_DELETE;
}
} else {
$source = \OC_Share_Backend_File::getSource($target, $this->getMountPoint(), $this->getItemType());
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}
$this->files[$target] = $source;
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}
return $this->files[$target];
}
/**
* Get the source file path for a shared file
*
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* @param string $target Shared target file path
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* @return string|false source file path or false if not found
*/
public function getSourcePath($target) {
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$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'];
}
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return false;
}
/**
* Get the permissions granted for a shared file
*
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* @param string $target Shared target file path
* @return int CRUDS permissions granted
*/
public function getPermissions($target = '') {
$permissions = $this->share['permissions'];
// part files and the mount point always have delete permissions
if ($target === '' || pathinfo($target, PATHINFO_EXTENSION) === 'part') {
$permissions |= \OCP\Constants::PERMISSION_DELETE;
}
if (\OCP\Util::isSharingDisabledForUser()) {
$permissions &= ~\OCP\Constants::PERMISSION_SHARE;
}
return $permissions;
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}
public function mkdir($path) {
if ($path == '' || $path == '/' || !$this->isCreatable(dirname($path))) {
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return false;
} else if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->mkdir($internalPath);
}
return false;
}
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/**
* Delete the directory if DELETE permission is granted
*
* @param string $path
* @return boolean
*/
public function rmdir($path) {
// never delete a share mount point
if (empty($path)) {
return false;
}
if (($source = $this->getSourcePath($path)) && $this->isDeletable($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->rmdir($internalPath);
}
return false;
}
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public function opendir($path) {
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$source = $this->getSourcePath($path);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->opendir($internalPath);
}
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public function is_dir($path) {
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$source = $this->getSourcePath($path);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->is_dir($internalPath);
}
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public function is_file($path) {
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if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->is_file($internalPath);
}
return false;
}
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public function stat($path) {
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if ($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;
}
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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;
}
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public function filesize($path) {
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$source = $this->getSourcePath($path);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->filesize($internalPath);
}
public function isCreatable($path) {
return ($this->getPermissions($path) & \OCP\Constants::PERMISSION_CREATE);
}
public function isReadable($path) {
return $this->file_exists($path);
}
public function isUpdatable($path) {
return ($this->getPermissions($path) & \OCP\Constants::PERMISSION_UPDATE);
}
public function isDeletable($path) {
return ($this->getPermissions($path) & \OCP\Constants::PERMISSION_DELETE);
}
public function isSharable($path) {
if (\OCP\Util::isSharingDisabledForUser()) {
return false;
}
return ($this->getPermissions($path) & \OCP\Constants::PERMISSION_SHARE);
}
public function file_exists($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;
}
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public function filemtime($path) {
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$source = $this->getSourcePath($path);
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->filemtime($internalPath);
}
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public function file_get_contents($path) {
$source = $this->getSourcePath($path);
if ($source) {
$info = array(
'target' => $this->getMountPoint() . $path,
'source' => $source,
);
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\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);
}
}
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public function file_put_contents($path, $data) {
if ($source = $this->getSourcePath($path)) {
// Check if permission is granted
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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,
);
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\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;
}
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/**
* Delete the file if DELETE permission is granted
*
* @param string $path
* @return boolean
*/
public function unlink($path) {
// never delete a share mount point
if (empty($path)) {
return false;
}
if ($source = $this->getSourcePath($path)) {
if ($this->isDeletable($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->unlink($internalPath);
}
}
return false;
}
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public function rename($path1, $path2) {
// we need the paths relative to data/user/files
$relPath1 = $this->getMountPoint() . '/' . $path1;
$relPath2 = $this->getMountPoint() . '/' . $path2;
$pathinfo = pathinfo($relPath1);
$isPartFile = (isset($pathinfo['extension']) && $pathinfo['extension'] === 'part');
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$targetExists = $this->file_exists($path2);
$sameFolder = (dirname($relPath1) === dirname($relPath2));
if ($targetExists || ($sameFolder && !$isPartFile)) {
// note that renaming a share mount point is always allowed
if (!$this->isUpdatable('')) {
return false;
}
} else {
if (!$this->isCreatable('')) {
return false;
}
}
// 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 ($isPartFile) {
list($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('');
$rootView->getUpdater()->disable(); // dont update the cache here
$result = $rootView->rename('/' . $user1 . '/files/' . $path1, '/' . $user2 . '/files/' . $path2 . '/' . $targetFilename);
$rootView->getUpdater()->enable();
return $result;
}
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public function copy($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 ($mode) {
case 'r+':
case 'rb+':
case 'w+':
case 'wb+':
case 'x+':
case 'xb+':
case 'a+':
case 'ab+':
case 'w':
case 'wb':
case 'x':
case 'xb':
case 'a':
case 'ab':
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$creatable = $this->isCreatable($path);
$updatable = $this->isUpdatable($path);
// if neither permissions given, no need to continue
if (!$creatable && !$updatable) {
return false;
}
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$exists = $this->file_exists($path);
// if a file exists, updatable permissions are required
if ($exists && !$updatable) {
return false;
}
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// part file is allowed if !$creatable but the final file is $updatable
if (pathinfo($path, PATHINFO_EXTENSION) !== 'part') {
if (!$exists && !$creatable) {
return false;
}
}
}
$info = array(
'target' => $this->getMountPoint() . $path,
'source' => $source,
'mode' => $mode,
);
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\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);
}
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return \OCP\Files\FileInfo::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;
}
/**
* return mount point of share, relative to data/user/files
*
* @return string
*/
public function getMountPoint() {
return $this->share['file_target'];
}
public function setMountPoint($path) {
$this->share['file_target'] = $path;
}
public function getShareType() {
return $this->share['share_type'];
}
/**
* does the group share already has a user specific unique name
*
* @return bool
*/
public function uniqueNameSet() {
return (isset($this->share['unique_name']) && $this->share['unique_name']);
}
/**
* the share now uses a unique name of this user
*
* @brief the share now uses a unique name of this user
*/
public function setUniqueName() {
$this->share['unique_name'] = true;
}
/**
* get share ID
*
* @return integer unique share ID
*/
public function getShareId() {
return $this->share['id'];
}
/**
* get the user who shared the file
*
* @return string
*/
public function getSharedFrom() {
return $this->share['uid_owner'];
}
/**
* @return array
*/
public function getShare() {
return $this->share;
}
/**
* 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 = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
return new \OC\Files\Cache\Shared_Cache($storage);
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}
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public function getScanner($path = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
return new \OC\Files\Cache\SharedScanner($storage);
}
public function getWatcher($path = '', $storage = null) {
if (!$storage) {
$storage = $this;
}
return new \OC\Files\Cache\Shared_Watcher($storage);
}
public function getOwner($path) {
if ($path == '') {
$path = $this->getMountPoint();
}
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$source = $this->getFile($path);
if ($source) {
return $source['fileOwner'];
}
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return false;
}
public function getETag($path) {
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if ($path == '') {
$path = $this->getMountPoint();
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}
if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->getETag($internalPath);
}
return null;
}
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/**
* unshare complete storage, also the grouped shares
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*
* @return bool
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*/
public function unshareStorage() {
$result = true;
if (!empty($this->share['grouped'])) {
foreach ($this->share['grouped'] as $share) {
$result = $result && \OCP\Share::unshareFromSelf($share['item_type'], $share['file_target']);
}
}
$result = $result && \OCP\Share::unshareFromSelf($this->getItemType(), $this->getMountPoint());
return $result;
}
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/**
* Resolve the path for the source of the share
*
* @param string $path
* @return array
*/
private function resolvePath($path) {
$source = $this->getSourcePath($path);
return \OC\Files\Filesystem::resolvePath($source);
}
/**
* @param \OCP\Files\Storage $sourceStorage
* @param string $sourceInternalPath
* @param string $targetInternalPath
* @return bool
*/
public function copyFromStorage(\OCP\Files\Storage $sourceStorage, $sourceInternalPath, $targetInternalPath) {
/** @var \OCP\Files\Storage $targetStorage */
list($targetStorage, $targetInternalPath) = $this->resolvePath($targetInternalPath);
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return $targetStorage->copyFromStorage($sourceStorage, $sourceInternalPath, $targetInternalPath);
}
/**
* @param \OCP\Files\Storage $sourceStorage
* @param string $sourceInternalPath
* @param string $targetInternalPath
* @return bool
*/
public function moveFromStorage(\OCP\Files\Storage $sourceStorage, $sourceInternalPath, $targetInternalPath) {
/** @var \OCP\Files\Storage $targetStorage */
list($targetStorage, $targetInternalPath) = $this->resolvePath($targetInternalPath);
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return $targetStorage->moveFromStorage($sourceStorage, $sourceInternalPath, $targetInternalPath);
}
}