mirror of
https://github.com/EGroupware/egroupware.git
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737 lines
24 KiB
PHP
737 lines
24 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 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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* @ToDo extended ACL with inheritance and specific rights for users or groups
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* Backends can implement them, in which case they get stored independent of the current mount-points.
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* If the backend does not implement them, they get stored by the VFS under the final URL of the backend,
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* to also allow mounts to change. The URL's to these extended attributes need to be renamed, when the
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* file or an underlaying directory get's renamed. That's the task of the backend, if it chooses to
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* implement extended ACL itself.
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* @ToDo storage for WebDAV properties
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* @ToDo implement the necessary function of WebDAV locks
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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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* 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 $fstab = array(
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'/' => 'sqlfs://$user:$pass@$host/',
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'/apps' => 'links://$user:$pass@$host/apps',
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// '/' => 'oldvfs://$user:$pass@$host/',
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// '/files' => 'oldvfs://$user:$pass@$host/home/Default',
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// '/images' => 'http://localhost/egroupware/phpgwapi/templates/idots/images',
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// '/home/ralf/linux' => '/home/ralf', // we probably need to forbid direct filesystem access for security reasons!
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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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* 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
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*
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* @param string $path
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* @return string/boolean false if the url cant be relsolved, should not happen if fstab has a root entry
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*/
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static function resolve_url($path)
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{
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static $cache = array();
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// we do some caching here
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if (isset($cache[$path]))
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{
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return $cache[$path];
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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' => $GLOBALS['egw_info']['user']['passwd'],
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'host' => $GLOBALS['egw_info']['user']['domain'],
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);
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}
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$parts = array_merge(parse_url($path),$defaults);
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if (!empty($parts['scheme']) && $parts['scheme'] != self::SCHEME)
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{
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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 .= substr($parts['path'],strlen($mounted));
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$url = str_replace(array('$user','$pass','$host'),array($parts['user'],$parts['pass'],$parts['host']),$url);
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if ($parts['query']) $url .= '?'.$parts['query'];
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if ($parts['fragment']) $url .= '#'.$parts['fragment'];
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//error_log(__METHOD__."($path) = $url");
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return $cache[$path] = $url;
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}
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}
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//error_log(__METHOD__."($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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* 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($path)))
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{
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return false;
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}
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if (!($this->opened_stream = fopen($url,$mode,$options)))
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{
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return false;
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}
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return true;
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}
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/**
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* This method is called when the stream is closed, using fclose().
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*
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* You must release any resources that were locked or allocated by the stream.
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*/
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function stream_close ( )
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{
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$ret = fclose($this->opened_stream);
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$this->opened_stream = 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($path)))
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{
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return false;
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}
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return unlink($url);
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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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*
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* It should attempt to rename the item specified by path_from to the specification given by path_to.
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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 renaming.
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*
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* The regular filesystem stream-wrapper returns an error, if $url_from and $url_to are not either both files or both dirs!
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*
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* @param string $path_from
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* @param string $path_to
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* @return boolean TRUE on success or FALSE on failure
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*/
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static function rename ( $path_from, $path_to )
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{
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if (!($url_from = self::resolve_url($path_from)) ||
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!($url_to = self::resolve_url($path_to)))
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{
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return false;
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}
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return rename($url_from,$url_to);
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}
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/**
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* This method is called in response to mkdir() calls on URL paths associated with the wrapper.
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*
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* It should attempt to create the directory 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 creating directories.
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*
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* @param string $path
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* @param int $mode
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* @param int $options Posible values include STREAM_REPORT_ERRORS and STREAM_MKDIR_RECURSIVE
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* @return boolean TRUE on success or FALSE on failure
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*/
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static function mkdir ( $path, $mode, $options )
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{
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if (!($url = self::resolve_url($path)))
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{
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return false;
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}
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return mkdir($url,$mode,$options);
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}
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/**
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* This method is called in response to rmdir() calls on URL paths associated with the wrapper.
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*
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* It should attempt to remove the directory 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 removing directories.
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*
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* @param string $path
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* @param int $options Possible values include STREAM_REPORT_ERRORS.
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* @return boolean TRUE on success or FALSE on failure.
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*/
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static function rmdir ( $path, $options )
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{
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if (!($url = self::resolve_url($path)))
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{
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return false;
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}
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return rmdir($url);
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}
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/**
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* Allow to call methods of the underlying stream wrapper: touch, chmod, chgrp, chown, ...
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*
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* We cant use a magic __call() method, as it does not work for static methods!
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*
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* @param string $name
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* @param array $params first param has to be the path, otherwise we can not determine the correct wrapper
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* @param boolean $fail_silent=false should only false be returned if function is not supported by the backend,
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* or should an E_USER_WARNING error be triggered (default)
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* @return mixed return value of backend or false if function does not exist on backend
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*/
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static protected function _call_on_backend($name,$params,$fail_silent=false)
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{
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$path = $params[0];
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if (!($url = self::resolve_url($params[0])))
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{
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return false;
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}
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if (($scheme = parse_url($url,PHP_URL_SCHEME)))
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{
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if (!class_exists($class = $scheme.'_stream_wrapper') || !method_exists($class,$name))
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{
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if (!$fail_silent) trigger_error("Can't $name for scheme $scheme!\n",E_USER_WARNING);
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return false;
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}
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$params[0] = $url;
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return call_user_func_array(array($scheme.'_stream_wrapper',$name),$params);
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}
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// call the filesystem specific function
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if (!function_exists($name))
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{
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return false;
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}
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return $name($url,$time);
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* @param string $path
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* @param int $time=null modification time (unix timestamp), default null = current time
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* @param int $atime=null access time (unix timestamp), default null = current time, not implemented in the vfs!
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* @return boolean true on success, false otherwise
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*/
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static function touch($path,$time=null,$atime=null)
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{
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return self::_call_on_backend('touch',array($path,$time,$atime));
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* Requires owner or root rights!
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*
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* @param string $path
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* @param string $mode mode string see egw_vfs::mode2int
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* @return boolean true on success, false otherwise
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*/
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static function chmod($path,$mode)
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{
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return self::_call_on_backend('chmod',array($path,$mode));
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* Requires root rights!
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*
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* @param string $path
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* @param int $owner numeric user id
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* @return boolean true on success, false otherwise
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*/
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static function chown($path,$owner)
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{
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return self::_call_on_backend('chown',array($path,$owner));
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* Requires owner or root rights!
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*
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* @param string $path
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* @param int $group numeric group id
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* @return boolean true on success, false otherwise
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*/
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static function chgrp($path,$group)
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{
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return self::_call_on_backend('chgrp',array($path,$group));
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}
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/**
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* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
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*
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* The methods use the following ways to get the mime type (in that order)
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* - directories (is_dir()) --> self::DIR_MIME_TYPE
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* - stream implemented by class defining the STAT_RETURN_MIME_TYPE constant --> use mime-type returned by url_stat
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* - for regular filesystem use mime_content_type function if available
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* - use eGW's mime-magic class
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*
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* @param string $path
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* @return string mime-type (self::DIR_MIME_TYPE for directories)
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*/
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static function mime_content_type($path)
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{
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if (!($url = self::resolve_url($path)))
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{
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return false;
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}
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if (is_dir($url))
|
|
{
|
|
$mime = self::DIR_MIME_TYPE;
|
|
}
|
|
if (!$mime && ($scheme = parse_url($url,PHP_URL_SCHEME)))
|
|
{
|
|
// check it it's an eGW stream wrapper returning mime-type via url_stat
|
|
if (class_exists($class = $scheme.'_stream_wrapper') && ($mime_attr = constant($class.'::STAT_RETURN_MIME_TYPE')))
|
|
{
|
|
$stat = call_user_func(array($scheme.'_stream_wrapper','url_stat'),parse_url($url,PHP_URL_PATH),0);
|
|
if ($stat[$mime_attr])
|
|
{
|
|
$mime = $stat[$mime_attr];
|
|
}
|
|
}
|
|
}
|
|
// 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
|
|
// ToDo: rework mime_magic as all methods cound be static!
|
|
if (!$mime)
|
|
{
|
|
static $mime_magic;
|
|
if (is_null($mime_magic))
|
|
{
|
|
$mime_magic = new mime_magic();
|
|
}
|
|
$mime = $mime_magic->filename2mime(parse_url($url,PHP_URL_PATH));
|
|
}
|
|
//error_log(__METHOD__."($path) mime=$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($path)))
|
|
{
|
|
return false;
|
|
}
|
|
if (!($this->opened_dir = opendir($this->opened_dir_url)))
|
|
{
|
|
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
|
|
$basepath = parse_url($this->opened_dir_url,PHP_URL_PATH);
|
|
foreach(self::$fstab as $mounted => $nul)
|
|
{
|
|
if (dirname($mounted) == $basepath && $mounted != '/')
|
|
{
|
|
$this->extra_dirs[] = basename($mounted);
|
|
}
|
|
}
|
|
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!
|
|
* @return array
|
|
*/
|
|
static function url_stat ( $path, $flags )
|
|
{
|
|
//error_log(__METHOD__."('$path',$flags)");
|
|
|
|
if (!($url = self::resolve_url($path)))
|
|
{
|
|
return false;
|
|
}
|
|
//error_log(__METHOD__."('$path',$flags) calling stat($url)");
|
|
return $stat = @stat($url); // suppressed the stat failed warnings
|
|
|
|
// 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(dirname($path,egw_vfs::WRITABLE)))
|
|
{
|
|
return false;
|
|
}
|
|
return $stat;
|
|
}
|
|
|
|
/**
|
|
* This method is called in response to readdir().
|
|
*
|
|
* It should return a string representing the next filename in the location opened by dir_opendir().
|
|
*
|
|
* Unless other filesystem, we only return files readable by the user, if the dir is not writable for him.
|
|
* This is done to hide files and dirs not accessible by the user (eg. other peoples home-dirs in /home).
|
|
*
|
|
* @return string
|
|
*/
|
|
function dir_readdir ( )
|
|
{
|
|
if ($this->extra_dirs && count($this->extra_dirs) > $this->extra_dir_ptr)
|
|
{
|
|
return $this->extra_dirs[$this->extra_dir_ptr++];
|
|
}
|
|
// only return children readable by the user, if dir is not writable
|
|
do {
|
|
$file = readdir($this->opened_dir);
|
|
}
|
|
while($file !== false && self::HIDE_UNREADABLES && !$this->opened_dir_writable &&
|
|
!egw_vfs::check_access(egw_vfs::concat($this->opened_dir_url,$file),egw_vfs::READABLE));
|
|
|
|
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':
|
|
require_once('HTTP/WebDAV/Client.php');
|
|
self::$wrappers[] = 'webdav';
|
|
break;
|
|
case '':
|
|
break; // default file, always loaded
|
|
default:
|
|
// check if scheme is buildin in php or one of our own stream wrappers
|
|
if (in_array($scheme,stream_get_wrappers()) || class_exists($scheme.'_stream_wrapper'))
|
|
{
|
|
self::$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::$wrappers;
|
|
}
|
|
|
|
static function init_static()
|
|
{
|
|
stream_register_wrapper(self::SCHEME,__CLASS__);
|
|
|
|
if ($GLOBALS['egw_info']['server']['vfs_fstab'] &&
|
|
is_array($fstab = unserialize($GLOBALS['egw_info']['server']['vfs_fstab'])) && count($fstab))
|
|
{
|
|
self::$fstab = $fstab;
|
|
}
|
|
}
|
|
}
|
|
|
|
vfs_stream_wrapper::init_static(); |