egroupware_official/phpgwapi/inc/class.vfs_stream_wrapper.inc.php
2009-11-28 15:23:26 +00:00

1069 lines
35 KiB
PHP

<?php
/**
* eGroupWare API: VFS - stream wrapper interface
*
* @link http://www.egroupware.org
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package api
* @subpackage vfs
* @author Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @copyright (c) 2008-9 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @version $Id$
*/
/**
* eGroupWare API: VFS - stream wrapper interface
*
* The new vfs stream wrapper uses a kind of fstab to mount different filesystems / stream wrapper types
* together for eGW's virtual file system.
*
* @link http://www.php.net/manual/en/function.stream-wrapper-register.php
*/
class vfs_stream_wrapper implements iface_stream_wrapper
{
/**
* Scheme / protocol used for this stream-wrapper
*/
const SCHEME = 'vfs';
/**
* Mime type of directories, the old vfs used 'Directory', while eg. WebDAV uses 'httpd/unix-directory'
*/
const DIR_MIME_TYPE = 'httpd/unix-directory';
/**
* Should unreadable entries in a not writable directory be hidden, default yes
*/
const HIDE_UNREADABLES = true;
/**
* optional context param when opening the stream, null if no context passed
*
* @var mixed
*/
var $context;
/**
* mode-bits, which have to be set for links
*/
const MODE_LINK = 0120000;
/**
* How much should be logged to the apache error-log
*
* 0 = Nothing
* 1 = only errors
* 2 = all function calls and errors (contains passwords too!)
*/
const LOG_LEVEL = 1;
/**
* Our fstab in the form mount-point => url
*
* The entry for root has to be the first, or more general if you mount into subdirs the parent has to be before!
*
* @var array
*/
protected static $fstab = array(
'/' => 'sqlfs://$host/',
'/apps' => 'links://$host/apps',
);
/**
* stream / ressouce this class is opened for by stream_open
*
* @var ressource
*/
private $opened_stream;
/**
* directory-ressouce this class is opened for by dir_open
*
* @var ressource
*/
private $opened_dir;
/**
* URL of the opened dir, used to build the complete URL of files in the dir
*
* @var string
*/
private $opened_dir_url;
/**
* Flag if opened dir is writable, in which case we return un-readable entries too
*
* @var boolean
*/
private $opened_dir_writable;
/**
* Extra dirs from our fstab in the current opened dir
*
* @var array
*/
private $extra_dirs;
/**
* Pointer in the extra dirs
*
* @var int
*/
private $extra_dir_ptr;
private static $wrappers;
/**
* Resolve the given path according to our fstab AND symlinks
*
* @param string $path
* @param boolean $file_exists=true true if file needs to exists, false if not
* @return string|boolean false if the url cant be resolved, should not happen if fstab has a root entry
*/
static function resolve_url_symlinks($path,$file_exists=true,$resolve_last_symlink=true)
{
$path = self::get_path($path);
if (!($stat = self::url_stat($path,$resolve_last_symlink?0:STREAM_URL_STAT_LINK)) && !$file_exists)
{
$ret = self::check_symlink_components($path,0,$url);
if (self::LOG_LEVEL > 1) $log = " (check_symlink_components('$path',0,'$url') = $ret)";
}
else
{
$url = $stat['url'];
}
// if the url resolves to a symlink to the vfs, resolve this vfs:// url direct
if ($url && parse_url($url,PHP_URL_SCHEME) == self::SCHEME)
{
$url = self::resolve_url(parse_url($url,PHP_URL_PATH));
}
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($path,file_exists=$file_exists,resolve_last_symlink=$resolve_last_symlink) = '$url'$log");
return $url;
}
/**
* Resolve the given path according to our fstab
*
* @param string $path
* @param boolean $do_symlink=true is a direct match allowed, default yes (must be false for a lstat or readlink!)
* @return string|boolean false if the url cant be resolved, should not happen if fstab has a root entry
*/
static function resolve_url($path,$do_symlink=true)
{
static $cache = array();
$path = self::get_path($path);
// we do some caching here
if (isset($cache[$path]))
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path') = '{$cache[$path]}' (from cache)");
return $cache[$path];
}
// check if we can already resolve path (or a part of it) with a known symlinks
$path = self::symlinkCache_resolve($path,$do_symlink);
// setting default user, passwd and domain, if it's not contained int the url
static $defaults;
if (is_null($defaults))
{
$defaults = array(
'user' => $GLOBALS['egw_info']['user']['account_lid'],
'pass' => $GLOBALS['egw_info']['user']['passwd'],
'host' => $GLOBALS['egw_info']['user']['domain'],
);
}
$parts = array_merge(parse_url($path),$defaults);
if (!$parts['host']) $parts['host'] = 'default'; // otherwise we get an invalid url (scheme:///path/to/something)!
if (!empty($parts['scheme']) && $parts['scheme'] != self::SCHEME)
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path') = '$path' (path is already an url)");
return $path; // path is already a non-vfs url --> nothing to do
}
if (empty($parts['path'])) $parts['path'] = '/';
foreach(array_reverse(self::$fstab) as $mounted => $url)
{
if ($mounted == '/' || $mounted == $parts['path'] || $mounted.'/' == substr($parts['path'],0,strlen($mounted)+1))
{
$scheme = parse_url($url,PHP_URL_SCHEME);
if (is_null(self::$wrappers) || !in_array($scheme,self::$wrappers))
{
self::load_wrapper($scheme);
}
$url = egw_vfs::concat($url,substr($parts['path'],strlen($mounted)));
$url = str_replace(array('$user','$pass','$host'),array($parts['user'],$parts['pass'],$parts['host']),$url);
if ($parts['query']) $url .= '?'.$parts['query'];
if ($parts['fragment']) $url .= '#'.$parts['fragment'];
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path') = '$url'");
return $cache[$path] = $url;
}
}
if (self::LOG_LEVEL > 0) error_log(__METHOD__."('$path') can't resolve path!\n");
trigger_error(__METHOD__."($path) can't resolve path!\n",E_USER_WARNING);
return false;
}
/**
* This method is called immediately after your stream object is created.
*
* @param string $path URL that was passed to fopen() and that this object is expected to retrieve
* @param string $mode mode used to open the file, as detailed for fopen()
* @param int $options additional flags set by the streams API (or'ed together):
* - STREAM_USE_PATH If path is relative, search for the resource using the include_path.
* - STREAM_REPORT_ERRORS If this flag is set, you are responsible for raising errors using trigger_error() during opening of the stream.
* If this flag is not set, you should not raise any errors.
* @param string $opened_path full path of the file/resource, if the open was successfull and STREAM_USE_PATH was set
* @return boolean true if the ressource was opened successful, otherwise false
*/
function stream_open ( $path, $mode, $options, &$opened_path )
{
$this->opened_stream = null;
if (!($url = self::resolve_url_symlinks($path,$mode[0]=='r')))
{
return false;
}
if (!($this->opened_stream = fopen($url,$mode,$options)))
{
return false;
}
return true;
}
/**
* This method is called when the stream is closed, using fclose().
*
* You must release any resources that were locked or allocated by the stream.
*/
function stream_close ( )
{
$ret = fclose($this->opened_stream);
$this->opened_stream = null;
return $ret;
}
/**
* This method is called in response to fread() and fgets() calls on the stream.
*
* You must return up-to count bytes of data from the current read/write position as a string.
* If there are less than count bytes available, return as many as are available.
* If no more data is available, return either FALSE or an empty string.
* You must also update the read/write position of the stream by the number of bytes that were successfully read.
*
* @param int $count
* @return string/false up to count bytes read or false on EOF
*/
function stream_read ( $count )
{
return fread($this->opened_stream,$count);
}
/**
* This method is called in response to fwrite() calls on the stream.
*
* You should store data into the underlying storage used by your stream.
* If there is not enough room, try to store as many bytes as possible.
* You should return the number of bytes that were successfully stored in the stream, or 0 if none could be stored.
* You must also update the read/write position of the stream by the number of bytes that were successfully written.
*
* @param string $data
* @return integer
*/
function stream_write ( $data )
{
return fwrite($this->opened_stream,$data);
}
/**
* This method is called in response to feof() calls on the stream.
*
* Important: PHP 5.0 introduced a bug that wasn't fixed until 5.1: the return value has to be the oposite!
*
* if(version_compare(PHP_VERSION,'5.0','>=') && version_compare(PHP_VERSION,'5.1','<'))
* {
* $eof = !$eof;
* }
*
* @return boolean true if the read/write position is at the end of the stream and no more data availible, false otherwise
*/
function stream_eof ( )
{
return feof($this->opened_stream);
}
/**
* This method is called in response to ftell() calls on the stream.
*
* @return integer current read/write position of the stream
*/
function stream_tell ( )
{
return ftell($this->opened_stream);
}
/**
* This method is called in response to fseek() calls on the stream.
*
* You should update the read/write position of the stream according to offset and whence.
* See fseek() for more information about these parameters.
*
* @param integer $offset
* @param integer $whence SEEK_SET - Set position equal to offset bytes
* SEEK_CUR - Set position to current location plus offset.
* 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.)
* @return boolean TRUE if the position was updated, FALSE otherwise.
*/
function stream_seek ( $offset, $whence )
{
return fseek($this->opened_stream,$offset,$whence);
}
/**
* This method is called in response to fflush() calls on the stream.
*
* If you have cached data in your stream but not yet stored it into the underlying storage, you should do so now.
*
* @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.
*/
function stream_flush ( )
{
return fflush($this->opened_stream);
}
/**
* This method is called in response to fstat() calls on the stream.
*
* If you plan to use your wrapper in a require_once you need to define stream_stat().
* If you plan to allow any other tests like is_file()/is_dir(), you have to define url_stat().
* stream_stat() must define the size of the file, or it will never be included.
* url_stat() must define mode, or is_file()/is_dir()/is_executable(), and any of those functions affected by clearstatcache() simply won't work.
* It's not documented, but directories must be a mode like 040777 (octal), and files a mode like 0100666.
* If you wish the file to be executable, use 7s instead of 6s.
* The last 3 digits are exactly the same thing as what you pass to chmod.
* 040000 defines a directory, and 0100000 defines a file.
*
* @return array containing the same values as appropriate for the stream.
*/
function stream_stat ( )
{
return fstat($this->opened_stream);
}
/**
* This method is called in response to unlink() calls on URL paths associated with the wrapper.
*
* It should attempt to delete the item specified by path.
* In order for the appropriate error message to be returned, do not define this method if your wrapper does not support unlinking!
*
* @param string $path
* @return boolean TRUE on success or FALSE on failure
*/
static function unlink ( $path )
{
if (!($url = self::resolve_url_symlinks($path,true,false))) // true,false file need to exist, but do not resolve last component
{
return false;
}
self::symlinkCache_remove($path);
return unlink($url);
}
/**
* This method is called in response to rename() calls on URL paths associated with the wrapper.
*
* 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));
}
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($path,false))) // false = directory does not need to exists
{
return false;
}
return mkdir($url,$mode,$options);
}
/**
* 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($path)))
{
return false;
}
self::symlinkCache_remove($path);
return rmdir($url);
}
/**
* 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;
}
$scheme2urls[(string)parse_url($url,PHP_URL_SCHEME)][$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)
{
return self::_call_on_backend('readlink',array($path),true); // true = fail silent, if backend does not support readlink
}
/**
* 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,$link)
{
return self::_call_on_backend('symlink',array($target,$link),false,1); // 1=path is in $link!
}
/**
* 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 $path
* @return string mime-type (self::DIR_MIME_TYPE for directories)
*/
static function mime_content_type($path)
{
if (!($url = self::resolve_url_symlinks($path)))
{
return false;
}
if (($scheme = parse_url($url,PHP_URL_SCHEME)))
{
// check it it's an eGW stream wrapper returning mime-type via url_stat
if (class_exists($class = self::scheme2class($scheme)) && ($mime_attr = @constant($class.'::STAT_RETURN_MIME_TYPE')))
{
$stat = call_user_func(array($class,'url_stat'),parse_url($url,PHP_URL_PATH),0);
if ($stat[$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
if (!$mime)
{
$mime = mime_magic::filename2mime(parse_url($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_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 => $nul)
{
if ((dirname($mounted) == $basepath || dirname($mounted).'/' == $basepath) && $mounted != '/')
{
$this->extra_dirs[] = basename($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, $check_symlink_components=true )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path',$flags,try_create_home=$try_create_home,check_symlink_components=$check_symlink_components)");
if (!($url = self::resolve_url($path,!($flags & STREAM_URL_STAT_LINK))))
{
if (self::LOG_LEVEL > 0) error_log(__METHOD__."('$path',$flags) can NOT resolve path!");
return false;
}
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) && ($lpath = self::readlink($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($lpath,STREAM_URL_STAT_QUIET))
{
if(isset($stat['url'])) $url = $stat['url']; // if stat returns an url use that, as there might be more links ...
self::symlinkCache_add($path,$url);
}
}
}
// check if a failed url_stat was for a home dir, in that case silently create it
if (!$stat && $try_create_home && dirname(parse_url($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;
}
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,$stat) &&
!egw_vfs::check_access(dirname($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 : $path;
}
/**
* This method is called in response to readdir().
*
* It should return a string representing the next filename in the location opened by dir_opendir().
*
* Unless other filesystem, we only return files readable by the user, if the dir is not writable for him.
* This is done to hide files and dirs not accessible by the user (eg. other peoples home-dirs in /home).
*
* @return string
*/
function dir_readdir ( )
{
if ($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) || // dont return mountpoints 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':
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(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 $path;
}
/**
* Init our static properties and register this wrapper
*
*/
static function init_static()
{
stream_register_wrapper(self::SCHEME,__CLASS__);
if ($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();