server/lib/files/storage/storage.php

<?php
/**
 * Copyright (c) 2012 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 OC\Files\Storage;

/**
 * Provide a common interface to all different storage options
 *
 * All paths passed to the storage are relative to the storage and should NOT have a leading slash.
 */
interface Storage {
	/**
	 * $parameters is a free form array with the configuration options needed to construct the storage
	 *
	 * @param array $parameters
	 */
	public function __construct($parameters);

	/**
	 * Get the identifier for the storage,
	 * the returned id should be the same for every storage object that is created with the same parameters
	 * and two storage objects with the same id should refer to two storages that display the same files.
	 *
	 * @return string
	 */
	public function getId();

	/**
	 * see http://php.net/manual/en/function.mkdir.php
	 *
	 * @param string $path
	 * @return bool
	 */
	public function mkdir($path);

	/**
	 * see http://php.net/manual/en/function.rmdir.php
	 *
	 * @param string $path
	 * @return bool
	 */
	public function rmdir($path);

	/**
	 * see http://php.net/manual/en/function.opendir.php
	 *
	 * @param string $path
	 * @return resource
	 */
	public function opendir($path);

	/**
	 * see http://php.net/manual/en/function.is_dir.php
	 *
	 * @param string $path
	 * @return bool
	 */
	public function is_dir($path);

	/**
	 * see http://php.net/manual/en/function.is_file.php
	 *
	 * @param string $path
	 * @return bool
	 */
	public function is_file($path);

	/**
	 * see http://php.net/manual/en/function.stat.php
	 * only the following keys are required in the result: size and mtime
	 *
	 * @param string $path
	 * @return array
	 */
	public function stat($path);

	/**
	 * see http://php.net/manual/en/function.filetype.php
	 *
	 * @param string $path
	 * @return bool
	 */
	public function filetype($path);

	/**
	 * see http://php.net/manual/en/function.filesize.php
	 * The result for filesize when called on a folder is required to be 0
	 *
	 * @param string $path
	 * @return int
	 */
	public function filesize($path);

	/**
	 * check if a file can be created in $path
	 *
	 * @param string $path
	 * @return bool
	 */
	public function isCreatable($path);

	/**
	 * check if a file can be read
	 *
	 * @param string $path
	 * @return bool
	 */
	public function isReadable($path);

	/**
	 * check if a file can be written to
	 *
	 * @param string $path
	 * @return bool
	 */
	public function isUpdatable($path);

	/**
	 * check if a file can be deleted
	 *
	 * @param string $path
	 * @return bool
	 */
	public function isDeletable($path);

	/**
	 * check if a file can be shared
	 *
	 * @param string $path
	 * @return bool
	 */
	public function isSharable($path);

	/**
	 * get the full permissions of a path.
	 * Should return a combination of the PERMISSION_ constants defined in lib/public/constants.php
	 *
	 * @param string $path
	 * @return int
	 */
	public function getPermissions($path);

	/**
	 * see http://php.net/manual/en/function.file_exists.php
	 *
	 * @param string $path
	 * @return bool
	 */
	public function file_exists($path);

	/**
	 * see http://php.net/manual/en/function.filemtime.php
	 *
	 * @param string $path
	 * @return int
	 */
	public function filemtime($path);

	/**
	 * see http://php.net/manual/en/function.file_get_contents.php
	 *
	 * @param string $path
	 * @return string
	 */
	public function file_get_contents($path);

	/**
	 * see http://php.net/manual/en/function.file_put_contents.php
	 *
	 * @param string $path
	 * @param string $data
	 * @return bool
	 */
	public function file_put_contents($path, $data);

	/**
	 * see http://php.net/manual/en/function.unlink.php
	 *
	 * @param string $path
	 * @return bool
	 */
	public function unlink($path);

	/**
	 * see http://php.net/manual/en/function.rename.php
	 *
	 * @param string $path1
	 * @param string $path2
	 * @return bool
	 */
	public function rename($path1, $path2);

	/**
	 * see http://php.net/manual/en/function.copy.php
	 *
	 * @param string $path1
	 * @param string $path2
	 * @return bool
	 */
	public function copy($path1, $path2);

	/**
	 * see http://php.net/manual/en/function.fopen.php
	 *
	 * @param string $path
	 * @param string $mode
	 * @return resource
	 */
	public function fopen($path, $mode);

	/**
	 * get the mimetype for a file or folder
	 * The mimetype for a folder is required to be "httpd/unix-directory"
	 *
	 * @param string $path
	 * @return string
	 */
	public function getMimeType($path);

	/**
	 * see http://php.net/manual/en/function.hash.php
	 *
	 * @param string $type
	 * @param string $path
	 * @param bool $raw
	 * @return string
	 */
	public function hash($type, $path, $raw = false);

	/**
	 * see http://php.net/manual/en/function.free_space.php
	 *
	 * @param string $path
	 * @return int
	 */
	public function free_space($path);

	/**
	 * search for occurrences of $query in file names
	 *
	 * @param string $query
	 * @return array
	 */
	public function search($query);

	/**
	 * see http://php.net/manual/en/function.touch.php
	 * If the backend does not support the operation, false should be returned
	 *
	 * @param string $path
	 * @param int $mtime
	 * @return bool
	 */
	public function touch($path, $mtime = null);

	/**
	 * get the path to a local version of the file.
	 * The local version of the file can be temporary and doesn't have to be persistent across requests
	 *
	 * @param string $path
	 * @return string
	 */
	public function getLocalFile($path);

	/**
	 * get the path to a local version of the folder.
	 * The local version of the folder can be temporary and doesn't have to be persistent across requests
	 *
	 * @param string $path
	 * @return string
	 */
	public function getLocalFolder($path);
	/**
	 * check if a file or folder has been updated since $time
	 *
	 * @param string $path
	 * @param int $time
	 * @return bool
	 *
	 * hasUpdated for folders should return at least true if a file inside the folder is add, removed or renamed.
	 * returning true for other changes in the folder is optional
	 */
	public function hasUpdated($path, $time);

	/**
	 * get a cache instance for the storage
	 *
	 * @param string $path
	 * @return \OC\Files\Cache\Cache
	 */
	public function getCache($path = '');

	/**
	 * get a scanner instance for the storage
	 *
	 * @param string $path
	 * @return \OC\Files\Cache\Scanner
	 */
	public function getScanner($path = '');


	/**
	 * get the user id of the owner of a file or folder
	 *
	 * @param string $path
	 * @return string
	 */
	public function getOwner($path);

	/**
	 * get a permissions cache instance for the cache
	 *
	 * @param string $path
	 * @return \OC\Files\Cache\Permissions
	 */
	public function getPermissionsCache($path = '');

	/**
	 * get a watcher instance for the cache
	 *
	 * @param string $path
	 * @return \OC\Files\Cache\Watcher
	 */
	public function getWatcher($path = '');

	/**
	 * @return \OC\Files\Cache\Storage
	 */
	public function getStorageCache();

	/**
	 * get the ETag for a file or folder
	 *
	 * @param string $path
	 * @return string
	 */
	public function getETag($path);
}