mirror of
https://github.com/EGroupware/egroupware.git
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1273 lines
42 KiB
PHP
1273 lines
42 KiB
PHP
<?php
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/**
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* eGroupWare API: VFS - stream wrapper interface
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*
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* @link http://www.egroupware.org
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* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
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* @package api
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* @subpackage vfs
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* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @copyright (c) 2008-10 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
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* @version $Id$
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*/
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/**
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* eGroupWare API: VFS - stream wrapper interface
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*
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* The new vfs stream wrapper uses a kind of fstab to mount different filesystems / stream wrapper types
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* together for eGW's virtual file system.
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*
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* @link http://www.php.net/manual/en/function.stream-wrapper-register.php
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*/
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class vfs_stream_wrapper implements iface_stream_wrapper
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{
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/**
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* Scheme / protocol used for this stream-wrapper
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*/
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const SCHEME = 'vfs';
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/**
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* Mime type of directories, the old vfs used 'Directory', while eg. WebDAV uses 'httpd/unix-directory'
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*/
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const DIR_MIME_TYPE = 'httpd/unix-directory';
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/**
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* Should unreadable entries in a not writable directory be hidden, default yes
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*/
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const HIDE_UNREADABLES = true;
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/**
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* optional context param when opening the stream, null if no context passed
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*
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* @var mixed
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*/
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var $context;
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/**
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* mode-bits, which have to be set for links
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*/
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const MODE_LINK = 0120000;
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/**
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* How much should be logged to the apache error-log
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*
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* 0 = Nothing
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* 1 = only errors
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* 2 = all function calls and errors (contains passwords too!)
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*/
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const LOG_LEVEL = 1;
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/**
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* Maximum depth of symlinks, if exceeded url_stat will return false
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*
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* Used to prevent infinit recursion by circular links
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*/
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const MAX_SYMLINK_DEPTH = 10;
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/**
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* Our fstab in the form mount-point => url
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*
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* The entry for root has to be the first, or more general if you mount into subdirs the parent has to be before!
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*
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* @var array
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*/
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protected static $fstab = array(
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'/' => 'sqlfs://$host/',
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'/apps' => 'links://$host/apps',
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);
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/**
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* stream / ressouce this class is opened for by stream_open
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*
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* @var ressource
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*/
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private $opened_stream;
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/**
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* Mode of opened stream, eg. "r" or "w"
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*
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* @var string
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*/
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private $opened_stream_mode;
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/**
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* Path of opened stream
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*
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* @var string
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*/
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private $opened_stream_path;
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/**
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* URL of opened stream
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*
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* @var string
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*/
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private $opened_stream_url;
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/**
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* Opened stream is a new file, false for existing files
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*
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* @var boolean
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*/
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private $opened_stream_is_new;
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/**
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* directory-ressouce this class is opened for by dir_open
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*
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* @var ressource
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*/
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private $opened_dir;
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/**
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* URL of the opened dir, used to build the complete URL of files in the dir
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*
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* @var string
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*/
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private $opened_dir_url;
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/**
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* Flag if opened dir is writable, in which case we return un-readable entries too
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*
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* @var boolean
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*/
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private $opened_dir_writable;
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/**
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* Extra dirs from our fstab in the current opened dir
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*
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* @var array
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*/
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private $extra_dirs;
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/**
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* Pointer in the extra dirs
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*
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* @var int
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*/
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private $extra_dir_ptr;
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private static $wrappers;
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/**
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* Resolve the given path according to our fstab AND symlinks
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*
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* @param string $path
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* @param boolean $file_exists=true true if file needs to exists, false if not
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* @param boolean $resolve_last_symlink=true
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* @param array|boolean &$stat=null on return: stat of existing file or false for non-existing files
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* @return string|boolean false if the url cant be resolved, should not happen if fstab has a root entry
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*/
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static function resolve_url_symlinks($path,$file_exists=true,$resolve_last_symlink=true,&$stat=null)
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{
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$path = self::get_path($path);
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if (!($stat = self::url_stat($path,$resolve_last_symlink?0:STREAM_URL_STAT_LINK)) && !$file_exists)
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{
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$stat = self::check_symlink_components($path,0,$url);
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if (self::LOG_LEVEL > 1) $log = " (check_symlink_components('$path',0,'$url') = $stat)";
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}
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else
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{
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$url = $stat['url'];
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}
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// if the url resolves to a symlink to the vfs, resolve this vfs:// url direct
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if ($url && parse_url($url,PHP_URL_SCHEME) == self::SCHEME)
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{
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$url = self::resolve_url(parse_url($url,PHP_URL_PATH));
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}
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if (self::LOG_LEVEL > 1) error_log(__METHOD__."($path,file_exists=$file_exists,resolve_last_symlink=$resolve_last_symlink) = '$url'$log");
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return $url;
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}
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/**
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* Resolve the given path according to our fstab
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*
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* @param string $path
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* @param boolean $do_symlink=true is a direct match allowed, default yes (must be false for a lstat or readlink!)
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* @param boolean $use_symlinkcache=true
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* @param boolean $replace_user_pass_host=true replace $user,$pass,$host in url, default true, if false result is not cached
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* @return string|boolean false if the url cant be resolved, should not happen if fstab has a root entry
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*/
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static function resolve_url($path,$do_symlink=true,$use_symlinkcache=true,$replace_user_pass_host=true)
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{
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static $cache = array();
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$path = self::get_path($path);
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// we do some caching here
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if (isset($cache[$path]) && $replace_user_pass_host)
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{
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if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path') = '{$cache[$path]}' (from cache)");
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return $cache[$path];
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}
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// check if we can already resolve path (or a part of it) with a known symlinks
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if ($use_symlinkcache)
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{
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$path = self::symlinkCache_resolve($path,$do_symlink);
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}
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// setting default user, passwd and domain, if it's not contained int the url
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static $defaults;
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if (is_null($defaults))
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{
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$defaults = array(
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'user' => $GLOBALS['egw_info']['user']['account_lid'],
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'pass' => urlencode($GLOBALS['egw_info']['user']['passwd']),
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'host' => $GLOBALS['egw_info']['user']['domain'],
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'home' => str_replace(array('\\\\','\\'),array('','/'),$GLOBALS['egw_info']['user']['homedirectory']),
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);
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}
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$parts = array_merge(parse_url($path),$defaults);
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if (!$parts['host']) $parts['host'] = 'default'; // otherwise we get an invalid url (scheme:///path/to/something)!
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if (!empty($parts['scheme']) && $parts['scheme'] != self::SCHEME)
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{
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if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path') = '$path' (path is already an url)");
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return $path; // path is already a non-vfs url --> nothing to do
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}
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if (empty($parts['path'])) $parts['path'] = '/';
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foreach(array_reverse(self::$fstab) as $mounted => $url)
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{
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if ($mounted == '/' || $mounted == $parts['path'] || $mounted.'/' == substr($parts['path'],0,strlen($mounted)+1))
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{
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$scheme = parse_url($url,PHP_URL_SCHEME);
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if (is_null(self::$wrappers) || !in_array($scheme,self::$wrappers))
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{
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self::load_wrapper($scheme);
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}
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$url = egw_vfs::concat($url,substr($parts['path'],strlen($mounted)));
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if ($replace_user_pass_host)
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{
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$url = str_replace(array('$user','$pass','$host','$home'),array($parts['user'],$parts['pass'],$parts['host'],$parts['home']),$url);
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}
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if ($parts['query']) $url .= '?'.$parts['query'];
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if ($parts['fragment']) $url .= '#'.$parts['fragment'];
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if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path') = '$url'");
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if ($replace_user_pass_host) $cache[$path] = $url;
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return $url;
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}
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}
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if (self::LOG_LEVEL > 0) error_log(__METHOD__."('$path') can't resolve path!\n");
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trigger_error(__METHOD__."($path) can't resolve path!\n",E_USER_WARNING);
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return false;
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}
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/**
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* Returns mount url of a full url returned by resolve_url
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*
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* @param string $fullurl full url returned by resolve_url
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* @return string|NULL mount url or null if not found
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*/
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static function mount_url($fullurl)
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{
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foreach(array_reverse(self::$fstab) as $mounted => $url)
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{
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list($url_no_query) = explode('?',$url);
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if (substr($fullurl,0,1+strlen($url_no_query)) === $url_no_query.'/')
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{
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return $url;
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}
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}
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return null;
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}
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/**
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* Can be used from egw_vfs to tell vfs notifications to treat an opened file as a new file
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*
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* @var boolean
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*/
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static protected $treat_as_new;
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/**
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* This method is called immediately after your stream object is created.
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*
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* @param string $path URL that was passed to fopen() and that this object is expected to retrieve
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* @param string $mode mode used to open the file, as detailed for fopen()
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* @param int $options additional flags set by the streams API (or'ed together):
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* - STREAM_USE_PATH If path is relative, search for the resource using the include_path.
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* - STREAM_REPORT_ERRORS If this flag is set, you are responsible for raising errors using trigger_error() during opening of the stream.
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* If this flag is not set, you should not raise any errors.
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* @param string $opened_path full path of the file/resource, if the open was successfull and STREAM_USE_PATH was set
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* @return boolean true if the ressource was opened successful, otherwise false
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*/
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function stream_open ( $path, $mode, $options, &$opened_path )
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{
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$this->opened_stream = null;
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if (!($url = self::resolve_url_symlinks($path,$mode[0]=='r',true,$stat)))
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{
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return false;
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}
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if (!($this->opened_stream = fopen($url,$mode,$options)))
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{
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return false;
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}
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$this->opened_stream_mode = $mode;
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$this->opened_stream_path = $path[0] == '/' ? $path : parse_url($path, PHP_URL_PATH);
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$this->opened_stream_url = $url;
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$this->opened_stream_is_new = !$stat;
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// are we requested to treat the opened file as new file (only for files opened NOT for reading)
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if ($mode[0] != 'r' && !$this->opened_stream_is_new && self::$treat_as_new)
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{
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$this->opened_stream_is_new = true;
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//error_log(__METHOD__."($path,$mode,...) stat=$stat, treat_as_new=".self::$treat_as_new." --> ".array2string($this->opened_stream_is_new));
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self::$treat_as_new = null;
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}
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return true;
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}
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/**
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* This method is called when the stream is closed, using fclose().
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*
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* You must release any resources that were locked or allocated by the stream.
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*
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* VFS calls either "vfs_read", "vfs_added" or "vfs_modified" hook
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*/
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function stream_close ( )
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{
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$ret = fclose($this->opened_stream);
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// clear PHP's stat cache, it contains wrong size of just closed file,
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// causing eg. notifications to be ignored, because of previous size 0, when using WebDAV
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clearstatcache(false);
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if (isset($GLOBALS['egw']) && isset($GLOBALS['egw']->hooks))
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{
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$GLOBALS['egw']->hooks->process(array(
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'location' => str_replace('b','',$this->opened_stream_mode) == 'r' ? 'vfs_read' :
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($this->opened_stream_is_new ? 'vfs_added' : 'vfs_modified'),
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'path' => $this->opened_stream_path,
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'mode' => $this->opened_stream_mode,
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'url' => $this->opened_stream_url,
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),'',true);
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}
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$this->opened_stream = $this->opened_stream_mode = $this->opened_stream_path = $this->opened_stream_url = $this->opened_stream_is_new = null;
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return $ret;
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}
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/**
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* This method is called in response to fread() and fgets() calls on the stream.
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*
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* You must return up-to count bytes of data from the current read/write position as a string.
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* If there are less than count bytes available, return as many as are available.
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* If no more data is available, return either FALSE or an empty string.
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* You must also update the read/write position of the stream by the number of bytes that were successfully read.
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*
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* @param int $count
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* @return string/false up to count bytes read or false on EOF
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*/
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function stream_read ( $count )
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{
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return fread($this->opened_stream,$count);
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}
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/**
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* This method is called in response to fwrite() calls on the stream.
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*
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* You should store data into the underlying storage used by your stream.
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* If there is not enough room, try to store as many bytes as possible.
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* You should return the number of bytes that were successfully stored in the stream, or 0 if none could be stored.
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* You must also update the read/write position of the stream by the number of bytes that were successfully written.
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*
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* @param string $data
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* @return integer
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*/
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function stream_write ( $data )
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{
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return fwrite($this->opened_stream,$data);
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}
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/**
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* This method is called in response to feof() calls on the stream.
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*
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* Important: PHP 5.0 introduced a bug that wasn't fixed until 5.1: the return value has to be the oposite!
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*
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* if(version_compare(PHP_VERSION,'5.0','>=') && version_compare(PHP_VERSION,'5.1','<'))
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* {
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* $eof = !$eof;
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* }
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*
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* @return boolean true if the read/write position is at the end of the stream and no more data availible, false otherwise
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*/
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function stream_eof ( )
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{
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return feof($this->opened_stream);
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}
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/**
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* This method is called in response to ftell() calls on the stream.
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*
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* @return integer current read/write position of the stream
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*/
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function stream_tell ( )
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{
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return ftell($this->opened_stream);
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}
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/**
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* This method is called in response to fseek() calls on the stream.
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*
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* You should update the read/write position of the stream according to offset and whence.
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* See fseek() for more information about these parameters.
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*
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* @param integer $offset
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* @param integer $whence SEEK_SET - Set position equal to offset bytes
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* SEEK_CUR - Set position to current location plus offset.
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* SEEK_END - Set position to end-of-file plus offset. (To move to a position before the end-of-file, you need to pass a negative value in offset.)
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* @return boolean TRUE if the position was updated, FALSE otherwise.
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*/
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function stream_seek ( $offset, $whence )
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{
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return fseek($this->opened_stream,$offset,$whence);
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}
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/**
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* This method is called in response to fflush() calls on the stream.
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*
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* If you have cached data in your stream but not yet stored it into the underlying storage, you should do so now.
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*
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* @return booelan TRUE if the cached data was successfully stored (or if there was no data to store), or FALSE if the data could not be stored.
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*/
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function stream_flush ( )
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{
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return fflush($this->opened_stream);
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}
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/**
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* This method is called in response to fstat() calls on the stream.
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*
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* If you plan to use your wrapper in a require_once you need to define stream_stat().
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* If you plan to allow any other tests like is_file()/is_dir(), you have to define url_stat().
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* stream_stat() must define the size of the file, or it will never be included.
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* url_stat() must define mode, or is_file()/is_dir()/is_executable(), and any of those functions affected by clearstatcache() simply won't work.
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* It's not documented, but directories must be a mode like 040777 (octal), and files a mode like 0100666.
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* If you wish the file to be executable, use 7s instead of 6s.
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* The last 3 digits are exactly the same thing as what you pass to chmod.
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* 040000 defines a directory, and 0100000 defines a file.
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*
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* @return array containing the same values as appropriate for the stream.
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*/
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function stream_stat ( )
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{
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return fstat($this->opened_stream);
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}
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/**
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* This method is called in response to unlink() calls on URL paths associated with the wrapper.
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*
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* It should attempt to delete the item specified by path.
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* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support unlinking!
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*
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* @param string $path
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* @return boolean TRUE on success or FALSE on failure
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*/
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static function unlink ( $path )
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{
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if (!($url = self::resolve_url_symlinks($path,true,false))) // true,false file need to exist, but do not resolve last component
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{
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return false;
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}
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$stat = self::url_stat($path, STREAM_URL_STAT_LINK);
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self::symlinkCache_remove($path);
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$ok = unlink($url);
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// call "vfs_unlink" hook only after successful unlink, with data from (not longer possible) stat call
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if ($ok && isset($GLOBALS['egw']) && isset($GLOBALS['egw']->hooks))
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{
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$GLOBALS['egw']->hooks->process(array(
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'location' => 'vfs_unlink',
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'path' => $path[0] == '/' ? $path : parse_url($path, PHP_URL_PATH),
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'url' => $url,
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'stat' => $stat,
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),'',true);
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}
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return $ok;
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}
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/**
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* This method is called in response to rename() calls on URL paths associated with the wrapper.
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*
|
|
* It should attempt to rename the item specified by path_from to the specification given by path_to.
|
|
* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support renaming.
|
|
*
|
|
* The regular filesystem stream-wrapper returns an error, if $url_from and $url_to are not either both files or both dirs!
|
|
*
|
|
* @param string $path_from
|
|
* @param string $path_to
|
|
* @return boolean TRUE on success or FALSE on failure
|
|
*/
|
|
static function rename ( $path_from, $path_to )
|
|
{
|
|
if (!($url_from = self::resolve_url_symlinks($path_from,true,false)) ||
|
|
!($url_to = self::resolve_url_symlinks($path_to,false)))
|
|
{
|
|
return false;
|
|
}
|
|
// if file is moved from one filesystem / wrapper to an other --> copy it (rename fails cross wrappers)
|
|
if (parse_url($url_from,PHP_URL_SCHEME) == parse_url($url_to,PHP_URL_SCHEME))
|
|
{
|
|
self::symlinkCache_remove($path_from);
|
|
$ret = rename($url_from,$url_to);
|
|
}
|
|
elseif (($from = fopen($url_from,'r')) && ($to = fopen($url_to,'w')))
|
|
{
|
|
$ret = stream_copy_to_stream($from,$to) !== false;
|
|
fclose($from);
|
|
fclose($to);
|
|
if ($ret) $ru = self::unlink($path_from);
|
|
}
|
|
else
|
|
{
|
|
$ret = false;
|
|
}
|
|
if (self::LOG_LEVEL > 1 || self::LOG_LEVEL && !$ret)
|
|
{
|
|
error_log(__METHOD__."('$path_from','$path_to') url_from='$url_from', url_to='$url_to' returning ".array2string($ret));
|
|
}
|
|
// call "vfs_rename" hook
|
|
if ($ret && isset($GLOBALS['egw']) && isset($GLOBALS['egw']->hooks))
|
|
{
|
|
$GLOBALS['egw']->hooks->process(array(
|
|
'location' => 'vfs_rename',
|
|
'from' => $path_from[0] == '/' ? $path_from : parse_url($path_from, PHP_URL_PATH),
|
|
'to' => $path_to[0] == '/' ? $path_to : parse_url($path_to, PHP_URL_PATH),
|
|
'url_from' => $url_from,
|
|
'url_to' => $url_to,
|
|
),'',true);
|
|
}
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to mkdir() calls on URL paths associated with the wrapper.
|
|
*
|
|
* It should attempt to create the directory specified by path.
|
|
* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support creating directories.
|
|
*
|
|
* @param string $path
|
|
* @param int $mode
|
|
* @param int $options Posible values include STREAM_REPORT_ERRORS and STREAM_MKDIR_RECURSIVE
|
|
* @return boolean TRUE on success or FALSE on failure
|
|
*/
|
|
static function mkdir ( $path, $mode, $options )
|
|
{
|
|
if (!($url = self::resolve_url_symlinks($path,false))) // false = directory does not need to exists
|
|
{
|
|
return false;
|
|
}
|
|
$ret = mkdir($url,$mode,$options);
|
|
|
|
// call "vfs_mkdir" hook
|
|
if ($ret && isset($GLOBALS['egw']) && isset($GLOBALS['egw']->hooks))
|
|
{
|
|
$GLOBALS['egw']->hooks->process(array(
|
|
'location' => 'vfs_mkdir',
|
|
'path' => $path[0] == '/' ? $path : parse_url($path, PHP_URL_PATH),
|
|
'url' => $url,
|
|
),'',true);
|
|
}
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to rmdir() calls on URL paths associated with the wrapper.
|
|
*
|
|
* It should attempt to remove the directory specified by path.
|
|
* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support removing directories.
|
|
*
|
|
* @param string $path
|
|
* @param int $options Possible values include STREAM_REPORT_ERRORS.
|
|
* @return boolean TRUE on success or FALSE on failure.
|
|
*/
|
|
static function rmdir ( $path, $options )
|
|
{
|
|
if (!($url = self::resolve_url_symlinks($path)))
|
|
{
|
|
return false;
|
|
}
|
|
$stat = self::url_stat($path, STREAM_URL_STAT_LINK);
|
|
|
|
self::symlinkCache_remove($path);
|
|
$ok = rmdir($url);
|
|
|
|
// call "vfs_rmdir" hook, only after successful rmdir
|
|
if ($ok && isset($GLOBALS['egw']) && isset($GLOBALS['egw']->hooks))
|
|
{
|
|
$GLOBALS['egw']->hooks->process(array(
|
|
'location' => 'vfs_rmdir',
|
|
'path' => $path[0] == '/' ? $path : parse_url($path, PHP_URL_PATH),
|
|
'url' => $url,
|
|
'stat' => $stat,
|
|
),'',true);
|
|
}
|
|
return $ok;
|
|
}
|
|
|
|
/**
|
|
* Allow to call methods of the underlying stream wrapper: touch, chmod, chgrp, chown, ...
|
|
*
|
|
* We cant use a magic __call() method, as it does not work for static methods!
|
|
*
|
|
* @param string $name
|
|
* @param array $params first param has to be the path, otherwise we can not determine the correct wrapper
|
|
* @param boolean $fail_silent=false should only false be returned if function is not supported by the backend,
|
|
* or should an E_USER_WARNING error be triggered (default)
|
|
* @param int $path_param_key=0 key in params containing the path, default 0
|
|
* @return mixed return value of backend or false if function does not exist on backend
|
|
*/
|
|
static protected function _call_on_backend($name,$params,$fail_silent=false,$path_param_key=0)
|
|
{
|
|
$pathes = $params[$path_param_key];
|
|
|
|
$scheme2urls = array();
|
|
foreach(is_array($pathes) ? $pathes : array($pathes) as $path)
|
|
{
|
|
if (!($url = self::resolve_url_symlinks($path,false,false)))
|
|
{
|
|
return false;
|
|
}
|
|
$k=(string)parse_url($url,PHP_URL_SCHEME);
|
|
if (!(is_array($scheme2urls[$k]))) $scheme2urls[$k] = array();
|
|
$scheme2urls[$k][$path] = $url;
|
|
}
|
|
$ret = array();
|
|
foreach($scheme2urls as $scheme => $urls)
|
|
{
|
|
if ($scheme)
|
|
{
|
|
if (!class_exists($class = self::scheme2class($scheme)) || !method_exists($class,$name))
|
|
{
|
|
if (!$fail_silent) trigger_error("Can't $name for scheme $scheme!\n",E_USER_WARNING);
|
|
return false;
|
|
}
|
|
if (!is_array($pathes))
|
|
{
|
|
$params[$path_param_key] = $url;
|
|
|
|
return call_user_func_array(array($class,$name),$params);
|
|
}
|
|
$params[$path_param_key] = $urls;
|
|
if (!is_array($r = call_user_func_array(array($class,$name),$params)))
|
|
{
|
|
return $r;
|
|
}
|
|
// we need to re-translate the urls to pathes, as they can eg. contain symlinks
|
|
foreach($urls as $path => $url)
|
|
{
|
|
if (isset($r[$url]) || isset($r[$url=parse_url($url,PHP_URL_PATH)]))
|
|
{
|
|
$ret[$path] = $r[$url];
|
|
}
|
|
}
|
|
}
|
|
// call the filesystem specific function (dont allow to use arrays!)
|
|
elseif(!function_exists($name) || is_array($pathes))
|
|
{
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
return $name($url,$time);
|
|
}
|
|
}
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
|
|
*
|
|
* @param string $path
|
|
* @param int $time=null modification time (unix timestamp), default null = current time
|
|
* @param int $atime=null access time (unix timestamp), default null = current time, not implemented in the vfs!
|
|
* @return boolean true on success, false otherwise
|
|
*/
|
|
static function touch($path,$time=null,$atime=null)
|
|
{
|
|
return self::_call_on_backend('touch',array($path,$time,$atime));
|
|
}
|
|
|
|
/**
|
|
* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
|
|
*
|
|
* Requires owner or root rights!
|
|
*
|
|
* @param string $path
|
|
* @param string $mode mode string see egw_vfs::mode2int
|
|
* @return boolean true on success, false otherwise
|
|
*/
|
|
static function chmod($path,$mode)
|
|
{
|
|
return self::_call_on_backend('chmod',array($path,$mode));
|
|
}
|
|
|
|
/**
|
|
* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
|
|
*
|
|
* Requires root rights!
|
|
*
|
|
* @param string $path
|
|
* @param int $owner numeric user id
|
|
* @return boolean true on success, false otherwise
|
|
*/
|
|
static function chown($path,$owner)
|
|
{
|
|
return self::_call_on_backend('chown',array($path,$owner));
|
|
}
|
|
|
|
/**
|
|
* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
|
|
*
|
|
* Requires owner or root rights!
|
|
*
|
|
* @param string $path
|
|
* @param int $group numeric group id
|
|
* @return boolean true on success, false otherwise
|
|
*/
|
|
static function chgrp($path,$group)
|
|
{
|
|
return self::_call_on_backend('chgrp',array($path,$group));
|
|
}
|
|
|
|
/**
|
|
* Returns the target of a symbolic link
|
|
*
|
|
* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
|
|
*
|
|
* @param string $path
|
|
* @return string|boolean link-data or false if no link
|
|
*/
|
|
static function readlink($path)
|
|
{
|
|
$ret = self::_call_on_backend('readlink',array($path),true); // true = fail silent, if backend does not support readlink
|
|
//error_log(__METHOD__."('$path') returning ".array2string($ret).' '.function_backtrace());
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Creates a symbolic link
|
|
*
|
|
* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
|
|
*
|
|
* @param string $target target of the link
|
|
* @param string $link path of the link to create
|
|
* @return boolean true on success, false on error
|
|
*/
|
|
static function symlink($target,$link)
|
|
{
|
|
if (($ret = self::_call_on_backend('symlink',array($target,$link),false,1))) // 1=path is in $link!
|
|
{
|
|
self::symlinkCache_remove($link);
|
|
}
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
|
|
*
|
|
* The methods use the following ways to get the mime type (in that order)
|
|
* - directories (is_dir()) --> self::DIR_MIME_TYPE
|
|
* - stream implemented by class defining the STAT_RETURN_MIME_TYPE constant --> use mime-type returned by url_stat
|
|
* - for regular filesystem use mime_content_type function if available
|
|
* - use eGW's mime-magic class
|
|
*
|
|
* @param string $path
|
|
* @param boolean $recheck=false true = do a new check, false = rely on stored mime type (if existing)
|
|
* @return string mime-type (self::DIR_MIME_TYPE for directories)
|
|
*/
|
|
static function mime_content_type($path,$recheck=false)
|
|
{
|
|
if (!($url = self::resolve_url_symlinks($path)))
|
|
{
|
|
return false;
|
|
}
|
|
if (($scheme = parse_url($url,PHP_URL_SCHEME)) && !$recheck)
|
|
{
|
|
// check it it's an eGW stream wrapper returning mime-type via url_stat
|
|
// we need to first check if the constant is defined, as we get a fatal error in php5.3 otherwise
|
|
if (class_exists($class = self::scheme2class($scheme)) &&
|
|
defined($class.'::STAT_RETURN_MIME_TYPE') &&
|
|
($mime_attr = constant($class.'::STAT_RETURN_MIME_TYPE')))
|
|
{
|
|
$stat = call_user_func(array($class,'url_stat'),parse_url($url,PHP_URL_PATH),0);
|
|
if ($stat && $stat[$mime_attr])
|
|
{
|
|
$mime = $stat[$mime_attr];
|
|
}
|
|
}
|
|
}
|
|
if (!$mime && is_dir($url))
|
|
{
|
|
$mime = self::DIR_MIME_TYPE;
|
|
}
|
|
// if we operate on the regular filesystem and the mime_content_type function is available --> use it
|
|
if (!$mime && !$scheme && function_exists('mime_content_type'))
|
|
{
|
|
$mime = mime_content_type($path);
|
|
}
|
|
// using EGw's own mime magic (currently only checking the extension!)
|
|
if (!$mime)
|
|
{
|
|
$mime = mime_magic::filename2mime(parse_url($url,PHP_URL_PATH));
|
|
}
|
|
//error_log(__METHOD__."($path,$recheck) mime=$mime");
|
|
return $mime;
|
|
}
|
|
|
|
/**
|
|
* This method is called immediately when your stream object is created for examining directory contents with opendir().
|
|
*
|
|
* @param string $path URL that was passed to opendir() and that this object is expected to explore.
|
|
* @return booelan
|
|
*/
|
|
function dir_opendir ( $path, $options )
|
|
{
|
|
$this->opened_dir = $this->extra_dirs = null;
|
|
$this->extra_dir_ptr = 0;
|
|
|
|
if (!($this->opened_dir_url = self::resolve_url_symlinks($path)))
|
|
{
|
|
if (self::LOG_LEVEL > 0) error_log(__METHOD__."( $path,$options) resolve_url_symlinks() failed!");
|
|
return false;
|
|
}
|
|
if (!($this->opened_dir = opendir($this->opened_dir_url)))
|
|
{
|
|
if (self::LOG_LEVEL > 0) error_log(__METHOD__."( $path,$options) opendir($this->opened_dir_url) failed!");
|
|
return false;
|
|
}
|
|
$this->opened_dir_writable = egw_vfs::check_access($this->opened_dir_url,egw_vfs::WRITABLE);
|
|
// check our fstab if we need to add some of the mountpoints
|
|
$basepath = parse_url($path,PHP_URL_PATH);
|
|
foreach(self::$fstab as $mounted => $url)
|
|
{
|
|
if (((egw_vfs::dirname($mounted) == $basepath || egw_vfs::dirname($mounted).'/' == $basepath) && $mounted != '/') &&
|
|
// only return children readable by the user, if dir is not writable
|
|
(!self::HIDE_UNREADABLES || $this->opened_dir_writable ||
|
|
egw_vfs::check_access($mounted,egw_vfs::READABLE)))
|
|
{
|
|
$this->extra_dirs[] = basename($mounted);
|
|
}
|
|
}
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."( $path,$options): opendir($this->opened_dir_url)=$this->opened_dir, extra_dirs=".array2string($this->extra_dirs).', '.function_backtrace());
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to stat() calls on the URL paths associated with the wrapper.
|
|
*
|
|
* It should return as many elements in common with the system function as possible.
|
|
* Unknown or unavailable values should be set to a rational value (usually 0).
|
|
*
|
|
* If you plan to use your wrapper in a require_once you need to define stream_stat().
|
|
* If you plan to allow any other tests like is_file()/is_dir(), you have to define url_stat().
|
|
* stream_stat() must define the size of the file, or it will never be included.
|
|
* url_stat() must define mode, or is_file()/is_dir()/is_executable(), and any of those functions affected by clearstatcache() simply won't work.
|
|
* It's not documented, but directories must be a mode like 040777 (octal), and files a mode like 0100666.
|
|
* If you wish the file to be executable, use 7s instead of 6s.
|
|
* The last 3 digits are exactly the same thing as what you pass to chmod.
|
|
* 040000 defines a directory, and 0100000 defines a file.
|
|
*
|
|
* @param string $path
|
|
* @param int $flags holds additional flags set by the streams API. It can hold one or more of the following values OR'd together:
|
|
* - STREAM_URL_STAT_LINK For resources with the ability to link to other resource (such as an HTTP Location: forward,
|
|
* or a filesystem symlink). This flag specified that only information about the link itself should be returned,
|
|
* not the resource pointed to by the link.
|
|
* This flag is set in response to calls to lstat(), is_link(), or filetype().
|
|
* - STREAM_URL_STAT_QUIET If this flag is set, your wrapper should not raise any errors. If this flag is not set,
|
|
* you are responsible for reporting errors using the trigger_error() function during stating of the path.
|
|
* stat triggers it's own warning anyway, so it makes no sense to trigger one by our stream-wrapper!
|
|
* @param boolean $try_create_home=false should a user home-directory be created automatic, if it does not exist
|
|
* @param boolean $check_symlink_components=true check if path contains symlinks in path components other then the last one
|
|
* @return array
|
|
*/
|
|
static function url_stat ( $path, $flags, $try_create_home=false, $check_symlink_components=true, $check_symlink_depth=self::MAX_SYMLINK_DEPTH, $try_reconnect=true )
|
|
{
|
|
if (!($url = self::resolve_url($path,!($flags & STREAM_URL_STAT_LINK), $check_symlink_components)))
|
|
{
|
|
if (self::LOG_LEVEL > 0) error_log(__METHOD__."('$path',$flags) can NOT resolve path!");
|
|
return false;
|
|
}
|
|
|
|
try {
|
|
if ($flags & STREAM_URL_STAT_LINK)
|
|
{
|
|
$stat = @lstat($url); // suppressed the stat failed warnings
|
|
}
|
|
else
|
|
{
|
|
$stat = @stat($url); // suppressed the stat failed warnings
|
|
|
|
if ($stat && ($stat['mode'] & self::MODE_LINK))
|
|
{
|
|
if (!$check_symlink_depth)
|
|
{
|
|
if (self::LOG_LEVEL > 0) error_log(__METHOD__."('$path',$flags) maximum symlink depth exceeded, might be a circular symlink!");
|
|
$stat = false;
|
|
}
|
|
elseif (($lpath = self::readlink($url)))
|
|
{
|
|
if ($lpath[0] != '/') // concat relative path
|
|
{
|
|
$lpath = egw_vfs::concat(parse_url($path,PHP_URL_PATH),'../'.$lpath);
|
|
}
|
|
$url = egw_vfs::PREFIX.$lpath;
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($path,$flags) symlif (substr($path,-1) == '/' && $path != '/') $path = substr($path,0,-1); // remove trailing slash eg. added by WebDAVink found and resolved to $url");
|
|
// try reading the stat of the link
|
|
if ($stat = self::url_stat($lpath, STREAM_URL_STAT_QUIET, false, true, $check_symlink_depth-1))
|
|
{
|
|
if(isset($stat['url'])) $url = $stat['url']; // if stat returns an url use that, as there might be more links ...
|
|
self::symlinkCache_add($path,$url);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
catch (egw_exception_db $e) {
|
|
// some long running operations, eg. merge-print, run into situation that DB closes our separate sqlfs connection
|
|
// we try now to reconnect sqlfs_stream_wrapper once
|
|
// it's done here in vfs_stream_wrapper as situation can happen in sqlfs, links, stylite.links or stylite.versioning
|
|
if ($try_reconnect)
|
|
{
|
|
// reconnect to db
|
|
sqlfs_stream_wrapper::reconnect();
|
|
return self::url_stat($path, $flags, $try_create_home, $check_symlink_components, $check_symlink_depth, false);
|
|
}
|
|
// if numer of tries is exceeded, re-throw exception
|
|
throw $e;
|
|
}
|
|
// check if a failed url_stat was for a home dir, in that case silently create it
|
|
if (!$stat && $try_create_home && egw_vfs::dirname(parse_url($path,PHP_URL_PATH)) == '/home' &&
|
|
($id = $GLOBALS['egw']->accounts->name2id(basename($path))) &&
|
|
$GLOBALS['egw']->accounts->id2name($id) == basename($path)) // make sure path has the right case!
|
|
{
|
|
$hook_data = array(
|
|
'location' => $GLOBALS['egw']->accounts->get_type($id) == 'g' ? 'addgroup' : 'addaccount',
|
|
'account_id' => $id,
|
|
'account_lid' => basename($path),
|
|
'account_name' => basename($path),
|
|
);
|
|
call_user_func(array('vfs_home_hooks',$hook_data['location']),$hook_data);
|
|
$hook_data = null;
|
|
$stat = self::url_stat($path,$flags,false);
|
|
}
|
|
if (!$stat && $check_symlink_components) // check if there's a symlink somewhere inbetween the path
|
|
{
|
|
$stat = self::check_symlink_components($path,$flags,$url);
|
|
if ($stat && isset($stat['url'])) self::symlinkCache_add($path,$stat['url']);
|
|
}
|
|
elseif(is_array($stat) && !isset($stat['url']))
|
|
{
|
|
$stat['url'] = $url;
|
|
}
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path',$flags,try_create_home=$try_create_home,check_symlink_components=$check_symlink_components) returning ".array2string($stat));
|
|
|
|
return $stat;
|
|
|
|
// Todo: if we hide non readables, we should return false on url_stat for consitency (if dir is not writabel)
|
|
// Problem: this does NOT stop (calles itself infinit recursive)!
|
|
if (self::HIDE_UNREADABLES && !egw_vfs::check_access($path,egw_vfs::READABLE,$stat) &&
|
|
!egw_vfs::check_access(egw_vfs::dirname($path,egw_vfs::WRITABLE)))
|
|
{
|
|
return false;
|
|
}
|
|
return $stat;
|
|
}
|
|
|
|
/**
|
|
* Check if path (which fails the stat call) contains symlinks in path-components other then the last one
|
|
*
|
|
* @param string $path
|
|
* @param int $flags=0 see url_stat
|
|
* @param string &$url=null already resolved path
|
|
* @return array|boolean stat array or false if not found
|
|
*/
|
|
static private function check_symlink_components($path,$flags=0,&$url=null)
|
|
{
|
|
if (is_null($url) && !($url = self::resolve_url($path)))
|
|
{
|
|
if (self::LOG_LEVEL > 0) error_log(__METHOD__."('$path',$flags,'$url') can NOT resolve path: ".function_backtrace(1));
|
|
return false;
|
|
}
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path',$flags,'$url'): ".function_backtrace(1));
|
|
|
|
while (($rel_path = egw_vfs::basename($url).($rel_path ? '/'.$rel_path : '')) &&
|
|
($url = egw_vfs::dirname($url)))
|
|
{
|
|
if (($stat = self::url_stat($url,0,false,false)))
|
|
{
|
|
if (is_link($url) && ($lpath = self::readlink($url)))
|
|
{
|
|
if (self::LOG_LEVEL > 1) $log = "rel_path='$rel_path', url='$url': lpath='$lpath'";
|
|
|
|
if ($lpath[0] != '/')
|
|
{
|
|
$lpath = egw_vfs::concat(parse_url($url,PHP_URL_PATH),'../'.$lpath);
|
|
}
|
|
//self::symlinkCache_add($path,egw_vfs::PREFIX.$lpath);
|
|
$url = egw_vfs::PREFIX.egw_vfs::concat($lpath,$rel_path);
|
|
if (self::LOG_LEVEL > 1) error_log("$log --> lpath='$lpath', url='$url'");
|
|
return self::url_stat($url,$flags);
|
|
}
|
|
$url = egw_vfs::concat($url,$rel_path);
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path',$flags,'$url') returning null");
|
|
return null;
|
|
}
|
|
}
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path',$flags,'$url') returning false");
|
|
return false; // $path does not exist
|
|
}
|
|
|
|
/**
|
|
* Cache of already resolved symlinks
|
|
*
|
|
* @var array with path => target
|
|
*/
|
|
private static $symlink_cache = array();
|
|
|
|
/**
|
|
* Add a resolved symlink to cache
|
|
*
|
|
* @param string $path vfs path
|
|
* @param string $target target path
|
|
*/
|
|
static protected function symlinkCache_add($path,$target)
|
|
{
|
|
$path = self::get_path($path);
|
|
|
|
if (isset(self::$symlink_cache[$path])) return; // nothing to do
|
|
|
|
if ($target[0] != '/') $target = parse_url($target,PHP_URL_PATH);
|
|
|
|
self::$symlink_cache[$path] = $target;
|
|
|
|
// sort longest path first
|
|
uksort(self::$symlink_cache,create_function('$b,$a','return strlen($a)-strlen($b);'));
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($path,$target) cache now ".array2string(self::$symlink_cache));
|
|
}
|
|
|
|
/**
|
|
* Remove a resolved symlink from cache
|
|
*
|
|
* @param string $path vfs path
|
|
*/
|
|
static protected function symlinkCache_remove($path)
|
|
{
|
|
$path = self::get_path($path);
|
|
|
|
unset(self::$symlink_cache[$path]);
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($path) cache now ".array2string(self::$symlink_cache));
|
|
}
|
|
|
|
/**
|
|
* Resolve a path from our symlink cache
|
|
*
|
|
* The cache is sorted from longer to shorter pathes.
|
|
*
|
|
* @param string $path
|
|
* @param boolean $do_symlink=true is a direct match allowed, default yes (must be false for a lstat or readlink!)
|
|
* @return string target or path, if path not found
|
|
*/
|
|
static public function symlinkCache_resolve($path,$do_symlink=true)
|
|
{
|
|
// remove vfs scheme, but no other schemes (eg. filesystem!)
|
|
$path = self::get_path($path);
|
|
|
|
$strlen_path = strlen($path);
|
|
|
|
foreach(self::$symlink_cache as $p => $t)
|
|
{
|
|
if (($strlen_p = strlen($p)) > $strlen_path) continue; // $path can NOT start with $p
|
|
|
|
if ($path == $p)
|
|
{
|
|
if ($do_symlink) $target = $t;
|
|
break;
|
|
}
|
|
elseif (substr($path,0,$strlen_p+1) == $p.'/')
|
|
{
|
|
$target = $t . substr($path,$strlen_p);
|
|
break;
|
|
}
|
|
}
|
|
if (self::LOG_LEVEL > 1 && isset($target)) error_log(__METHOD__."($path) = $target");
|
|
return isset($target) ? $target : $path;
|
|
}
|
|
|
|
/**
|
|
* Clears our internal stat and symlink cache
|
|
*
|
|
* Normaly not necessary, as it is automatically cleared/updated, UNLESS egw_vfs::$user changes!
|
|
*
|
|
* We have to clear the symlink cache before AND after calling the backend,
|
|
* because auf traversal rights may be different when egw_vfs::$user changes!
|
|
*
|
|
* @param string $path='/' path of backend, whos cache to clear
|
|
*/
|
|
static function clearstatcache($path='/')
|
|
{
|
|
//error_log(__METHOD__."('$path')");
|
|
self::$symlink_cache = array();
|
|
self::_call_on_backend('clearstatcache', array($path), true, 0);
|
|
self::$symlink_cache = array();
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to readdir().
|
|
*
|
|
* It should return a string representing the next filename in the location opened by dir_opendir().
|
|
*
|
|
* Unless other filesystem, we only return files readable by the user, if the dir is not writable for him.
|
|
* This is done to hide files and dirs not accessible by the user (eg. other peoples home-dirs in /home).
|
|
*
|
|
* @return string
|
|
*/
|
|
function dir_readdir ( )
|
|
{
|
|
if ($this->extra_dirs && count($this->extra_dirs) > $this->extra_dir_ptr)
|
|
{
|
|
$file = $this->extra_dirs[$this->extra_dir_ptr++];
|
|
}
|
|
else
|
|
{
|
|
// only return children readable by the user, if dir is not writable
|
|
do {
|
|
$file = readdir($this->opened_dir);
|
|
}
|
|
while($file !== false &&
|
|
(is_array($this->extra_dirs) && in_array($file,$this->extra_dirs) || // do NOT return extra_dirs twice
|
|
self::HIDE_UNREADABLES && !$this->opened_dir_writable &&
|
|
!egw_vfs::check_access(egw_vfs::concat($this->opened_dir_url,$file),egw_vfs::READABLE)));
|
|
}
|
|
if (self::LOG_LEVEL > 1) error_log(__METHOD__."( $this->opened_dir ) = '$file'");
|
|
return $file;
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to rewinddir().
|
|
*
|
|
* It should reset the output generated by dir_readdir(). i.e.:
|
|
* The next call to dir_readdir() should return the first entry in the location returned by dir_opendir().
|
|
*
|
|
* @return boolean
|
|
*/
|
|
function dir_rewinddir ( )
|
|
{
|
|
$this->extra_dir_ptr = 0;
|
|
|
|
return rewinddir($this->opened_dir);
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to closedir().
|
|
*
|
|
* You should release any resources which were locked or allocated during the opening and use of the directory stream.
|
|
*
|
|
* @return boolean
|
|
*/
|
|
function dir_closedir ( )
|
|
{
|
|
$ret = closedir($this->opened_dir);
|
|
|
|
$this->opened_dir = $this->extra_dirs = null;
|
|
|
|
return $ret;
|
|
}
|
|
|
|
/**
|
|
* Load stream wrapper for a given schema
|
|
*
|
|
* @param string $scheme
|
|
* @return boolean
|
|
*/
|
|
static function load_wrapper($scheme)
|
|
{
|
|
if (!in_array($scheme,self::get_wrappers()))
|
|
{
|
|
switch($scheme)
|
|
{
|
|
case 'webdav':
|
|
case 'webdavs':
|
|
require_once('HTTP/WebDAV/Client.php');
|
|
self::$wrappers[] = $scheme;
|
|
break;
|
|
case '':
|
|
break; // default file, always loaded
|
|
default:
|
|
// check if scheme is buildin in php or one of our own stream wrappers
|
|
if (in_array($scheme,stream_get_wrappers()) || class_exists(self::scheme2class($scheme)))
|
|
{
|
|
self::$wrappers[] = $scheme;
|
|
}
|
|
else
|
|
{
|
|
trigger_error("Can't load stream-wrapper for scheme '$scheme'!",E_USER_WARNING);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Return already loaded stream wrappers
|
|
*
|
|
* @return array
|
|
*/
|
|
static function get_wrappers()
|
|
{
|
|
if (is_null(self::$wrappers))
|
|
{
|
|
self::$wrappers = stream_get_wrappers();
|
|
}
|
|
return self::$wrappers;
|
|
}
|
|
|
|
/**
|
|
* Get the class-name for a scheme
|
|
*
|
|
* A scheme is not allowed to contain an underscore, but allows a dot and a class names only allow or need underscores, but no dots
|
|
* --> we replace dots in scheme with underscored to get the class-name
|
|
*
|
|
* @param string $scheme eg. vfs
|
|
* @return string
|
|
*/
|
|
static function scheme2class($scheme)
|
|
{
|
|
return str_replace('.','_',$scheme).'_stream_wrapper';
|
|
}
|
|
|
|
/**
|
|
* Getting the path from an url (or path) AND removing trailing slashes
|
|
*
|
|
* @param string $path url or path (might contain trailing slash from WebDAV!)
|
|
* @param string $only_remove_scheme=self::SCHEME if given only that scheme get's removed
|
|
* @return string path without training slash
|
|
*/
|
|
static protected function get_path($path,$only_remove_scheme=self::SCHEME)
|
|
{
|
|
$url_parts = parse_url($path);
|
|
if ($path[0] != '/' && (!$only_remove_scheme || $url_parts['scheme'] == $only_remove_scheme))
|
|
{
|
|
$path = $url_parts['path'];
|
|
}
|
|
// remove trailing slashes eg. added by WebDAV
|
|
if ($url_parts['path'] != '/')
|
|
{
|
|
while (substr($path,-1) == '/' && $path != '/')
|
|
{
|
|
$path = substr($path,0,-1);
|
|
}
|
|
}
|
|
return $path;
|
|
}
|
|
|
|
/**
|
|
* Init our static properties and register this wrapper
|
|
*
|
|
*/
|
|
static function init_static()
|
|
{
|
|
stream_register_wrapper(self::SCHEME,__CLASS__);
|
|
|
|
if (($fstab = $GLOBALS['egw_info']['server']['vfs_fstab']) && is_array($fstab) && count($fstab))
|
|
{
|
|
self::$fstab = $fstab;
|
|
}
|
|
}
|
|
}
|
|
|
|
vfs_stream_wrapper::init_static();
|