nextcloud/apps/files_sharing/lib/sharedstorage.php

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<?php
/**
* ownCloud
*
* @author Michael Gapczynski
* @copyright 2011 Michael Gapczynski mtgap@owncloud.com
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*
* 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/>.
*
*/
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namespace OC\Files\Storage;
/**
* Convert target path to source path and pass the function call to the correct storage provider
*/
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class Shared extends \OC\Files\Storage\Common {
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private $sharedFolder;
private $files = array();
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public function __construct($arguments) {
$this->sharedFolder = $arguments['sharedFolder'];
}
public function getId(){
return 'shared::' . $this->sharedFolder;
}
/**
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* @brief Get the source file path, permissions, and owner for a shared file
* @param string Shared target file path
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* @return Returns array with the keys path, permissions, and owner or false if not found
*/
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private function getFile($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));
if ($source) {
$source['path'] = '/'.$source['uid_owner'].'/'.$source['path'].'.part';
// All partial files have delete permission
$source['permissions'] |= \OCP\PERMISSION_DELETE;
}
} else {
$source = \OC_Share_Backend_File::getSource($target);
if ($source) {
$source['path'] = '/'.$source['uid_owner'].'/'.$source['path'];
}
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}
$this->files[$target] = $source;
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}
return $this->files[$target];
}
/**
* @brief Get the source file path for a shared file
* @param string Shared target file path
* @return string source file path or false if not found
*/
private function getSourcePath($target) {
$source = $this->getFile($target);
if ($source) {
\OC\Files\Filesystem::initMountPoints($source['uid_owner']);
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return $source['path'];
}
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return false;
}
/**
* @brief Get the permissions granted for a shared file
* @param string Shared target file path
* @return int CRUDS permissions granted or false if not found
*/
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public function getPermissions($target) {
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$source = $this->getFile($target);
if ($source) {
return $source['permissions'];
}
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return false;
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}
public function mkdir($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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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;
}
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public function opendir($path) {
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if ($path == '' || $path == '/') {
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$files = \OCP\Share::getItemsSharedWith('file', \OC_Share_Backend_Folder::FORMAT_OPENDIR);
\OC\Files\Stream\Dir::register('shared', $files);
return opendir('fakedir://shared');
} else if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->opendir($internalPath);
}
return false;
}
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public function is_dir($path) {
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if ($path == '' || $path == '/') {
return true;
} else if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->is_dir($internalPath);
}
return false;
}
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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($path) {
if ($path == '' || $path == '/' || $this->is_dir($path)) {
return 0;
} else if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->filesize($internalPath);
}
return false;
}
public function isCreatable($path) {
if ($path == '') {
return false;
}
return ($this->getPermissions($path) & \OCP\PERMISSION_CREATE);
}
public function isReadable($path) {
return $this->file_exists($path);
}
public function isUpdatable($path) {
if ($path == '') {
return false;
}
return ($this->getPermissions($path) & \OCP\PERMISSION_UPDATE);
}
public function isDeletable($path) {
if ($path == '') {
return true;
}
return ($this->getPermissions($path) & \OCP\PERMISSION_DELETE);
}
public function isSharable($path) {
if ($path == '') {
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;
}
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public function filemtime($path) {
if ($path == '' || $path == '/') {
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$mtime = 0;
if ($dh = $this->opendir($path)) {
while (($filename = readdir($dh)) !== false) {
$tempmtime = $this->filemtime($filename);
if ($tempmtime > $mtime) {
$mtime = $tempmtime;
}
}
}
return $mtime;
} else {
$source = $this->getSourcePath($path);
if ($source) {
list($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(
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'target' => $this->sharedFolder.$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
if (($this->file_exists($path) && !$this->isUpdatable($path)) || ($this->is_dir($path) && !$this->isCreatable($path))) {
return false;
}
$info = array(
'target' => $this->sharedFolder.$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 $result;
}
return false;
}
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public function unlink($path) {
// Delete the file if DELETE permission is granted
if ($source = $this->getSourcePath($path)) {
if ($this->isDeletable($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->unlink($internalPath);
} else if (dirname($path) == '/' || dirname($path) == '.') {
// Unshare the file from the user if in the root of the Shared folder
if ($this->is_dir($path)) {
$itemType = 'folder';
} else {
$itemType = 'file';
}
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return \OCP\Share::unshareFromSelf($itemType, $path);
}
}
return false;
}
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public function rename($path1, $path2) {
// Check for partial files
if (pathinfo($path1, PATHINFO_EXTENSION) === 'part') {
if ($oldSource = $this->getSourcePath($path1)) {
list($storage, $oldInternalPath) = \OC\Files\Filesystem::resolvePath($oldSource);
$newInternalPath = substr($oldInternalPath, 0, -5);
return $storage->rename($oldInternalPath, $newInternalPath);
}
} else {
// Renaming/moving is only allowed within shared folders
$pos1 = strpos($path1, '/', 1);
$pos2 = strpos($path2, '/', 1);
if ($pos1 !== false && $pos2 !== false && ($oldSource = $this->getSourcePath($path1))) {
$newSource = $this->getSourcePath(dirname($path2)).'/'.basename($path2);
if (dirname($path1) == dirname($path2)) {
// Rename the file if UPDATE permission is granted
if ($this->isUpdatable($path1)) {
list($storage, $oldInternalPath) = \OC\Files\Filesystem::resolvePath($oldSource);
list( , $newInternalPath) = \OC\Files\Filesystem::resolvePath($newSource);
return $storage->rename($oldInternalPath, $newInternalPath);
}
} else {
// Move the file if DELETE and CREATE permissions are granted
if ($this->isDeletable($path1) && $this->isCreatable(dirname($path2))) {
// Get the root shared folder
$folder1 = substr($path1, 0, $pos1);
$folder2 = substr($path2, 0, $pos2);
// Copy and unlink the file if it exists in a different shared folder
if ($folder1 != $folder2) {
if ($this->copy($path1, $path2)) {
return $this->unlink($path1);
}
} else {
list($storage, $oldInternalPath) = \OC\Files\Filesystem::resolvePath($oldSource);
list( , $newInternalPath) = \OC\Files\Filesystem::resolvePath($newSource);
return $storage->rename($oldInternalPath, $newInternalPath);
}
}
}
}
}
return false;
}
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public function copy($path1, $path2) {
// Copy the file if CREATE permission is granted
if ($this->isCreatable(dirname($path2))) {
$source = $this->fopen($path1, 'r');
$target = $this->fopen($path2, 'w');
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return \OC_Helper::streamCopy($source, $target);
}
return false;
}
public function fopen($path, $mode) {
if ($source = $this->getSourcePath($path)) {
switch ($mode) {
case 'r+':
case 'rb+':
case 'w+':
case 'wb+':
case 'x+':
case 'xb+':
case 'a+':
case 'ab+':
case 'w':
case 'wb':
case 'x':
case 'xb':
case 'a':
case 'ab':
if (!$this->isUpdatable($path)) {
return false;
}
}
$info = array(
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'target' => $this->sharedFolder.$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 ($path == '' || $path == '/') {
return 'httpd/unix-directory';
}
if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->getMimeType($internalPath);
}
return false;
}
public function free_space($path) {
if ($path == '') {
return -1;
}
$source = $this->getSourcePath($path);
if ($source) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->free_space($internalPath);
}
}
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) {
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if (!\OCP\User::isLoggedIn() || \OCP\User::getUser() != $options['user'] || \OCP\Share::getItemsSharedWith('file')) {
$user_dir = $options['user_dir'];
\OC\Files\Filesystem::mount('\OC\Files\Storage\Shared', array('sharedFolder' => '/Shared'), $user_dir.'/Shared/');
}
}
public function hasUpdated($path, $time) {
if ($path == '') {
return false;
}
return $this->filemtime($path) > $time;
}
public function getCache($path = '') {
return new \OC\Files\Cache\Shared_Cache($this);
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}
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public function getScanner($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 ($path == '') {
return false;
}
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$source = $this->getFile($path);
if ($source) {
return $source['uid_owner'];
}
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return false;
}
public function getETag($path) {
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if ($path == '') {
return parent::getETag($path);
}
if ($source = $this->getSourcePath($path)) {
list($storage, $internalPath) = \OC\Files\Filesystem::resolvePath($source);
return $storage->getETag($internalPath);
}
return null;
}
}