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egroupware_official/phpgwapi/inc/class.sqlfs_stream_wrapper.inc.php

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<?php
/**
* eGroupWare API: VFS - new DB based VFS stream wrapper
*
* @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 by Ralf Becker <RalfBecker-AT-outdoor-training.de>
* @version $Id$
*/
/**
* eGroupWare API: VFS - new DB based VFS stream wrapper
*
* The sqlfs stream wrapper has 3 operation modi:
* - content of files is stored in the filesystem (eGW's files_dir) (default)
* - content of files is stored as BLOB in the DB
* - content of files is versioned (and stored in the DB) NOT YET IMPLEMENTED
* In the future it will be possible to activate eg. versioning in parts of the filesystem, via mount options in the vfs
*
* I use the PDO DB interface, as it allows to access BLOB's as streams (avoiding to hold them complete in memory).
*
* The interface is according to the docu on php.net
*
* @link http://de.php.net/manual/de/function.stream-wrapper-register.php
* @ToDo compare (and optimize) performance with old vfs system (eg. via webdav)
* @ToDo pass $operation parameter via context from vfs stream-wrappers mount table, to eg. allow to mount parts with(out) versioning
* @ToDo versioning
*/
class sqlfs_stream_wrapper implements iface_stream_wrapper
{
/**
* Mime type of directories, the old vfs uses 'Directory', while eg. WebDAV uses 'httpd/unix-directory'
*/
const DIR_MIME_TYPE = 'httpd/unix-directory';
/**
* Scheme / protocoll used for this stream-wrapper
*/
const SCHEME = 'sqlfs';
/**
* Does url_stat returns a mime type, or has it to be determined otherwise (string with attribute name)
*/
const STAT_RETURN_MIME_TYPE = 'mime';
/**
* Our tablename
*/
const TABLE = 'egw_sqlfs';
/**
* mode-bits, which have to be set for files
*/
const MODE_FILE = 0100000;
/**
* mode-bits, which have to be set for directories
*/
const MODE_DIR = 040000;
/**
* 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;
/**
* We do versioning AND store the content in the db, NOT YET IMPLEMENTED
*/
const VERSIONING = 0;
/**
* We store the content in the DB (no versioning)
*/
const STORE2DB = 1;
/**
* We store the content in the filesystem (egw_info/server/files_dir) (no versioning)
*/
const STORE2FS = 2;
/**
* default for operation, change that if you want to test with STORE2DB atm
*/
const DEFAULT_OPERATION = 2;
var $operation = self::DEFAULT_OPERATION;
/**
* optional context param when opening the stream, null if no context passed
*
* @var mixed
*/
var $context;
/**
* Path off the file opened by stream_open
*
* @var string
*/
protected $opened_path;
/**
* Mode of the file opened by stream_open
*
* @var int
*/
protected $opened_mode;
/**
* Stream of the opened file, either from the DB via PDO or the filesystem
*
* @var resource
*/
protected $opened_stream;
/**
* fs_id of opened file
*
* @var int
*/
protected $opened_fs_id;
/**
* Directory vfs::ls() of dir opened with dir_opendir()
*
* This static var gets overwritten by each new dir_opendir, it helps to not read the entries twice.
*
* @var array $path => info-array pairs
*/
static private $stat_cache;
/**
* Reference to the PDO object we use
*
* @var PDO
*/
static private $pdo;
/**
* Array with filenames of dir opened with dir_opendir
*
* @var array
*/
protected $opened_dir;
/**
* This method is called immediately after your stream object is created.
*
* @param string $url 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 ( $url, $mode, $options, &$opened_path )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url,$mode,$options)");
$path = parse_url($url,PHP_URL_PATH);
$this->opened_path = $path;
$this->opened_mode = $mode;
$this->opened_stream = null;
$stat = self::url_stat($url,0);
if (!($stat = self::url_stat($path,0)) || $mode[0] == 'x') // file not found or file should NOT exist
{
if ($mode[0] == 'r' || // does $mode require the file to exist (r,r+)
$mode[0] == 'x' || // or file should not exist, but does
!egw_vfs::check_access(($dir_stat = self::url_stat(dirname($path),0)),egw_vfs::WRITABLE)) // or we are not allowed to create it
{
self::_remove_password($url);
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$mode,$options) file does not exist or can not be created!");
if (!($options & STREAM_URL_STAT_QUIET))
{
trigger_error(__METHOD__."($url,$mode,$options) file does not exist or can not be created!",E_USER_WARNING);
}
$this->opened_stream = $this->opened_path = $this->opened_mode = null;
return false;
}
// new file --> create it in the DB
if ($this->operation == self::STORE2FS)
{
$stmt = self::$pdo->prepare($query='INSERT INTO '.self::TABLE.' (fs_name,fs_dir,fs_mode,fs_uid,fs_gid,fs_created,fs_modified,fs_creator'.
') VALUES (:fs_name,:fs_dir,:fs_mode,:fs_uid,:fs_gid,:fs_created,:fs_modified,:fs_creator)');
}
else
{
$stmt = self::$pdo->prepare($query='INSERT INTO '.self::TABLE.' (fs_name,fs_dir,fs_mode,fs_uid,fs_gid,fs_created,fs_modified,fs_creator,fs_content'.
') VALUES (:fs_name,:fs_dir,:fs_mode,:fs_uid,:fs_gid,:fs_created,:fs_modified,:fs_creator,:fs_content)');
$stmt->bindParam(':fs_content',$this->opened_stream,PDO::PARAM_LOB);
}
$values = array(
'fs_name' => basename($path),
'fs_dir' => $dir_stat['ino'],
// we use the mode of the dir, so files in group dirs stay accessible by all members
'fs_mode' => $dir_stat['mode'] & 0666,
// for the uid we use the uid of the dir if not 0=root or the current user otherwise
'fs_uid' => $dir_stat['uid'] ? $dir_stat['uid'] : egw_vfs::$user,
// we allways use the group of the dir
'fs_gid' => $dir_stat['gid'],
'fs_created' => self::_pdo_timestamp(time()),
'fs_modified' => self::_pdo_timestamp(time()),
'fs_creator' => egw_vfs::$user,
);
foreach($values as $name => &$val)
{
$stmt->bindParam(':'.$name,$val);
}
if (!$stmt->execute() || !($this->opened_fs_id = self::$pdo->lastInsertId('fs_id')))
{
$this->opened_stream = $this->opened_path = $this->opened_mode = null;
echo self::$pdo->errorInfo()."\n";
return false;
}
}
else
{
if ($mode != 'r' && !egw_vfs::check_access($stat,egw_vfs::WRITABLE)) // we are not allowed to edit it
{
self::_remove_password($url);
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$mode,$options) file can not be edited!");
if (!($options & STREAM_URL_STAT_QUIET))
{
trigger_error(__METHOD__."($url,$mode,$options) file can not be edited!",E_USER_WARNING);
}
$this->opened_stream = $this->opened_path = $this->opened_mode = null;
return false;
}
$this->opened_fs_id = $stat['fs_id'];
}
// do we operate directly on the filesystem
if ($this->operation == self::STORE2FS)
{
$this->opened_stream = fopen(self::_fs_path($path),$mode);
}
if ($mode[0] == 'a') // append modes: a, a+
{
$this->stream_seek(0,SEEK_END);
}
return is_resource($this->opened_stream);
}
/**
* 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 ( )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."()");
if (is_null($this->opened_path) || !is_resource($this->opened_stream) || !$this->opened_fs_id)
{
return false;
}
if ($this->opened_mode != 'r')
{
$this->stream_seek(0,SEEK_END);
static $mime_magic;
if (is_null($mime_magic))
{
$mime_magic = new mime_magic();
}
// we need to update the mime-type and size
$values = array(
':fs_size' => $this->stream_tell(),
// todo: analyse the file for the mime-type
':fs_mime' => $mime_magic->filename2mime($this->opened_path),
':fs_id' => $this->opened_fs_id,
);
$ret = fclose($this->opened_stream);
$stmt = self::$pdo->prepare('UPDATE '.self::TABLE.' SET fs_size=:fs_size,fs_mime=:fs_mime WHERE fs_id=:fs_id');
$stmt->execute($values);
}
else
{
$ret = fclose($this->opened_stream);
}
$this->opened_stream = $this->opened_path = $this->opened_mode = $this->opend_fs_id = 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 ( $count )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($count) pos=$this->opened_pos");
if (is_resource($this->opened_stream))
{
return fread($this->opened_stream,$count);
}
return false;
}
/**
* 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 ( $data )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($data)");
if (is_resource($this->opened_stream))
{
return fwrite($this->opened_stream,$data);
}
return false;
}
/**
* 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 ( )
{
if (is_resource($this->opened_stream))
{
return feof($this->opened_stream);
}
return false;
}
/**
* This method is called in response to ftell() calls on the stream.
*
* @return integer current read/write position of the stream
*/
function stream_tell ( )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."()");
if (is_resource($this->opened_stream))
{
return ftell($this->opened_stream);
}
return false;
}
/**
* 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, $whence )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($offset,$whence)");
if (is_resource($this->opened_stream))
{
return fseek($this->opened_stream,$offset,$whence);
}
return false;
}
/**
* This method is called in response to fflush() calls on the stream.
*
* If you have cached data in your stream but not yet stored it into the underlying storage, you should do so now.
*
* @return booelan TRUE if the cached data was successfully stored (or if there was no data to store), or FALSE if the data could not be stored.
*/
function stream_flush ( )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."()");
if (is_resource($this->opened_stream))
{
return fflush($this->opened_stream);
}
return false;
}
/**
* This method is called in response to fstat() calls on the stream.
*
* If you plan to use your wrapper in a require_once you need to define stream_stat().
* If you plan to allow any other tests like is_file()/is_dir(), you have to define url_stat().
* stream_stat() must define the size of the file, or it will never be included.
* url_stat() must define mode, or is_file()/is_dir()/is_executable(), and any of those functions affected by clearstatcache() simply won't work.
* It's not documented, but directories must be a mode like 040777 (octal), and files a mode like 0100666.
* If you wish the file to be executable, use 7s instead of 6s.
* The last 3 digits are exactly the same thing as what you pass to chmod.
* 040000 defines a directory, and 0100000 defines a file.
*
* @return array containing the same values as appropriate for the stream.
*/
function stream_stat ( )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($this->opened_path)");
return $this->url_stat($this->opened_path,0);
}
/**
* 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 $url
* @return boolean TRUE on success or FALSE on failure
*/
static function unlink ( $url,$operation=self::DEFAULT_OPERATION )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url)");
$path = parse_url($url,PHP_URL_PATH);
if (!($stat = self::url_stat($path,0)) || !($dir_stat = self::url_stat(dirname($path),0)) ||
!egw_vfs::check_access($dir_stat,egw_vfs::WRITABLE))
{
self::_remove_password($url);
if (self::LOG_LEVEL) error_log(__METHOD__."($url) (type=$type) permission denied!");
return false; // no permission or file does not exist
}
$stmt = self::$pdo->prepare('DELETE FROM '.self::TABLE.' WHERE fs_id=:fs_id');
unset(self::$stat_cache[$path]);
if (($ret = $stmt->execute(array(':fs_id' => $stat['ino']))) && $operation == self::STORE2FS)
{
unlink(self::_fs_path($path));
}
return $ret;
}
/**
* 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 $url_from
* @param string $url_to
* @return boolean TRUE on success or FALSE on failure
*/
static function rename ( $url_from, $url_to, $operation=self::DEFAULT_OPERATION )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url_from,$url_to)");
$path_from = parse_url($url_from,PHP_URL_PATH);
$path_to = parse_url($url_to,PHP_URL_PATH);
if (!($from_stat = self::url_stat($path_from,0)) ||
!($from_dir_stat = self::url_stat(dirname($path_from),0)) || !egw_vfs::check_access($from_dir_stat,egw_vfs::WRITABLE))
{
self::_remove_password($url_from);
self::_remove_password($url_to);
if (self::LOG_LEVEL) error_log(__METHOD__."($url_from,$url_to): $path_from permission denied!");
return false; // no permission or file does not exist
}
if (!($to_dir_stat = self::url_stat(dirname($path_to),0)) || !egw_vfs::check_access($to_dir_stat,egw_vfs::WRITABLE))
{
self::_remove_password($url_from);
self::_remove_password($url_to);
if (self::LOG_LEVEL) error_log(__METHOD__."($url_from,$url_to): $path_to permission denied!");
return false; // no permission or parent-dir does not exist
}
// the filesystem stream-wrapper does NOT allow to rename files to directories, as this makes problems
// for our vfs too, we abort here with an error, like the filesystem one does
if (($to_stat = self::url_stat($path_to,0)) &&
($to_stat['mime'] === self::DIR_MIME_TYPE) !== ($from_stat['mime'] === self::DIR_MIME_TYPE))
{
self::_remove_password($url_from);
self::_remove_password($url_to);
$is_dir = $to_stat['mime'] === self::DIR_MIME_TYPE ? 'a' : 'no';
if (self::LOG_LEVEL) error_log(__METHOD__."($url_to,$url_from) $path_to is $is_dir directory!");
return false; // no permission or file does not exist
}
$stmt = self::$pdo->prepare('UPDATE '.self::TABLE.' SET fs_dir=:fs_dir,fs_name=:fs_name WHERE fs_id=:fs_id');
if (($ret = $stmt->execute(array(
':fs_dir' => $to_dir_stat['ino'],
':fs_name' => basename($path_to),
':fs_id' => $from_stat['ino'],
))) && $operation == self::STORE2FS)
{
rename(self::_fs_path($path_from),self::_fs_path($path_to));
}
unset(self::$stat_cache[$path_from]);
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 $url
* @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 ( $url, $mode, $options, $operation=self::DEFAULT_OPERATION )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url,$mode,$options)");
$path = parse_url($url,PHP_URL_PATH);
if (self::url_stat($path,STREAM_URL_STAT_QUIET))
{
self::_remove_password($url);
if (self::LOG_LEVEL) error_log(__METHOD__."('$url',$mode,$options) already exist!");
if (!($options & STREAM_URL_STAT_QUIET))
{
trigger_error(__METHOD__."('$url',$mode,$options) already exist!",E_USER_WARNING);
}
return false;
}
$parent = self::url_stat(dirname($path),STREAM_URL_STAT_QUIET);
// check if we should also create all non-existing path components and our parent does not exist,
// if yes call ourself recursive with the parent directory
if (($options & STREAM_MKDIR_RECURSIVE) && $path != '/' && !$parent)
{
if (!self::mkdir(dirname($path),$mode,$options))
{
return false;
}
$parent = self::url_stat(dirname($path),0);
}
if (!$parent || !egw_vfs::check_access($parent,egw_vfs::WRITABLE))
{
self::_remove_password($url);
if (self::LOG_LEVEL) error_log(__METHOD__."('$url',$mode,$options) permission denied!");
if (!($options & STREAM_URL_STAT_QUIET))
{
trigger_error(__METHOD__."('$url',$mode,$options) permission denied!",E_USER_WARNING);
}
return false; // no permission or file does not exist
}
$stmt = self::$pdo->prepare('INSERT INTO '.self::TABLE.' (fs_name,fs_dir,fs_mode,fs_uid,fs_gid,fs_size,fs_mime,fs_created,fs_modified,fs_creator'.
') VALUES (:fs_name,:fs_dir,:fs_mode,:fs_uid,:fs_gid,:fs_size,:fs_mime,:fs_created,:fs_modified,:fs_creator)');
if (($ret = $stmt->execute(array(
':fs_name' => basename($path),
':fs_dir' => $parent['ino'],
':fs_mode' => $parent['mode'],
':fs_uid' => $parent['uid'],
':fs_gid' => $parent['gid'],
':fs_size' => 0,
':fs_mime' => self::DIR_MIME_TYPE,
':fs_created' => self::_pdo_timestamp(time()),
':fs_modified' => self::_pdo_timestamp(time()),
':fs_creator' => egw_vfs::$user,
))) && $operation == self::STORE2FS)
{
mkdir(self::_fs_path($path));
}
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 $url
* @param int $options Possible values include STREAM_REPORT_ERRORS.
* @return boolean TRUE on success or FALSE on failure.
*/
static function rmdir ( $url, $options, $operation=self::DEFAULT_OPERATION )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url)");
$path = parse_url($url,PHP_URL_PATH);
if (!($stat = self::url_stat($path,0)) || $stat['mime'] != self::DIR_MIME_TYPE ||
!($parent = self::url_stat(dirname($path),0)) || !egw_vfs::check_access($parent,egw_vfs::WRITABLE))
{
self::_remove_password($url);
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$options) (type=$type) permission denied!");
if (!($options & STREAM_URL_STAT_QUIET))
{
trigger_error(__METHOD__."('$url',$options) (type=$type) permission denied!",E_USER_WARNING);
}
return false; // no permission or file does not exist
}
$stmt = self::$pdo->prepare('SELECT COUNT(*) FROM '.self::TABLE.' WHERE fs_dir=?');
$stmt->execute(array($stat['ino']));
if ($stmt->fetchColumn())
{
self::_remove_password($url);
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$options) dir is not empty!");
if (!($options & STREAM_URL_STAT_QUIET))
{
trigger_error(__METHOD__."('$url',$options) dir is not empty!",E_USER_WARNING);
}
return false;
}
unset(self::$stat_cache[$path]);
$stmt = self::$pdo->prepare('DELETE FROM '.self::TABLE.' WHERE fs_id=?');
if (($ret = $stmt->execute(array($stat['ino']))) && $operation == self::STORE2FS)
{
rmdir(self::_fs_path($path));
}
return $ret;
}
/**
* This is not (yet) a stream-wrapper function, but it's necessary and can be used static
*
* @param string $url
* @param int $time=null modification time (unix timestamp), default null = current time
* @param int $atime=null access time (unix timestamp), default null = current time, not implemented in the vfs!
*/
static function touch($url,$time=null,$atime=null)
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url)");
$path = parse_url($url,PHP_URL_PATH);
if (!($stat = self::url_stat($path,STREAM_URL_STAT_QUIET)))
{
// file does not exist --> create an empty one
if (($f = fopen(self::SCHEME.'://default'.$path,'w')) && fclose($f))
{
if (!is_null($time))
{
$stat = self::url_stat($path,0);
}
}
else
{
return false;
}
}
$stmt = self::$pdo->prepare('UPDATE '.self::TABLE.' SET fs_modified=:fs_modified WHERE fs_id=:fs_id');
return $stmt->execute(array(
':fs_modified' => self::_pdo_timestamp($time ? $time : time()),
':fs_id' => $stat['ino'],
));
}
/**
* Chown command, not yet a stream-wrapper function, but necessary
*
* @param string $url
* @param int $owner
* @return boolean
*/
static function chown($url,$owner)
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url,$owner)");
$path = parse_url($url,PHP_URL_PATH);
if (!($stat = self::url_stat($path,0)))
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) no such file or directory!");
trigger_error("No such file or directory $url !",E_USER_WARNING);
return false;
}
if (!egw_vfs::$is_root)
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) only root can do that!");
trigger_error("Only root can do that!",E_USER_WARNING);
return false;
}
if ($owner < 0 || !$GLOBALS['egw']->accounts->id2name($owner)) // not a user
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) unknown (numeric) user id!");
trigger_error("Unknown (numeric) user id!",E_USER_WARNING);
return false;
}
$stmt = self::$pdo->prepare('UPDATE '.self::TABLE.' SET fs_uid=:fs_uid WHERE fs_id=:fs_id');
return $stmt->execute(array(
':fs_uid' => (int) $owner,
':fs_id' => $stat['ino'],
));
}
/**
* Chgrp command, not yet a stream-wrapper function, but necessary
*
* @param string $url
* @param int $group
* @return boolean
*/
static function chgrp($url,$owner)
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url,$owner)");
$path = parse_url($url,PHP_URL_PATH);
if (!($stat = self::url_stat($path,0)))
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) no such file or directory!");
trigger_error("No such file or directory $url !",E_USER_WARNING);
return false;
}
if (!egw_vfs::$is_root && $stat['uid'] != egw_vfs::$user)
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) only owner or root can do that!");
trigger_error("Only owner or root can do that!",E_USER_WARNING);
return false;
}
if ($owner < 0) $owner = -$owner; // sqlfs uses a positiv group id's!
if ($owner && !$GLOBALS['egw']->accounts->id2name(-$owner)) // not a group
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) unknown (numeric) group id!");
trigger_error("Unknown (numeric) group id!",E_USER_WARNING);
return false;
}
$stmt = self::$pdo->prepare('UPDATE '.self::TABLE.' SET fs_gid=:fs_gid WHERE fs_id=:fs_id');
return $stmt->execute(array(
':fs_gid' => $owner,
':fs_id' => $stat['ino'],
));
}
/**
* Chmod command, not yet a stream-wrapper function, but necessary
*
* @param string $url
* @param int $mode
* @return boolean
*/
static function chmod($url,$mode)
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($url,$owner)");
$path = parse_url($url,PHP_URL_PATH);
if (!($stat = self::url_stat($path,0)))
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) no such file or directory!");
trigger_error("No such file or directory $url !",E_USER_WARNING);
return false;
}
if (!egw_vfs::$is_root && $stat['uid'] != egw_vfs::$user)
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) only owner or root can do that!");
trigger_error("Only owner or root can do that!",E_USER_WARNING);
return false;
}
if (!is_numeric($mode)) // not a mode
{
if (self::LOG_LEVEL) error_log(__METHOD__."($url,$owner) no (numeric) mode!");
trigger_error("No (numeric) mode!",E_USER_WARNING);
return false;
}
$stmt = self::$pdo->prepare('UPDATE '.self::TABLE.' SET fs_mode=:fs_mode WHERE fs_id=:fs_id');
return $stmt->execute(array(
':fs_mode' => ((int) $mode) & 0777, // we dont store the file and dir bits, give int overflow!
':fs_id' => $stat['ino'],
));
}
/**
* This method is called immediately when your stream object is created for examining directory contents with opendir().
*
* @ToDo check all parent dirs for readable (fastest would be with sql query) !!!
* @param string $path URL that was passed to opendir() and that this object is expected to explore.
* @param $options
* @return booelan
*/
function dir_opendir ( $url, $options )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$url',$options)");
$this->opened_dir = null;
$path = parse_url($url,PHP_URL_PATH);
if (!($stat = self::url_stat($url,0)) || // dir not found
$stat['mime'] != self::DIR_MIME_TYPE || // no dir
!egw_vfs::check_access($stat,egw_vfs::EXECUTABLE|egw_vfs::READABLE)) // no access
{
self::_remove_password($url);
$msg = $stat['mime'] != self::DIR_MIME_TYPE ? "$url is no directory" : 'permission denied';
if (self::LOG_LEVEL) error_log(__METHOD__."('$url',$options) $msg!");
$this->opened_dir = null;
return false;
}
$this->opened_dir = array();
$query = 'SELECT fs_id,fs_name,fs_mode,fs_uid,fs_gid,fs_size,fs_mime,fs_created,fs_modified FROM '.self::TABLE.' WHERE fs_dir=?';
// only return readable files, if dir is not writable by user
if (!egw_vfs::check_access($stat,egw_vfs::WRITABLE))
{
$query .= ' AND '.self::_sql_readable();
}
$query = "/* sqlfs::dir_opendir($path) */ ".$query;
$stmt = self::$pdo->prepare($query);
$stmt->setFetchMode(PDO::FETCH_ASSOC);
if ($stmt->execute(array($stat['ino'])))
{
foreach($stmt as $file)
{
$this->opened_dir[] = $file['fs_name'];
self::$stat_cache[$path.'/'.$file['fs_name']] = $file;
}
}
//print_r($this->opened_dir);
reset($this->opened_dir);
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 ( $url, $flags )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$url',$flags)");
$path = parse_url($url,PHP_URL_PATH);
// webdav adds a trailing slash to dirs, which causes url_stat to NOT find the file otherwise
if ($path != '/' && substr($path,-1) == '/')
{
$path = substr($path,0,-1);
}
// check if we already have the info from the last dir_open call, as the old vfs reads it anyway from the db
if (self::$stat_cache && isset(self::$stat_cache[$path]))
{
return self::_vfsinfo2stat(self::$stat_cache[$path]);
}
if (!is_object(self::$pdo))
{
self::_pdo();
}
$base_query = 'SELECT fs_id,fs_name,fs_mode,fs_uid,fs_gid,fs_size,fs_mime,fs_created,fs_modified FROM '.self::TABLE.' WHERE fs_name=? AND fs_dir=';
$parts = explode('/',$path);
foreach($parts as $n => $name)
{
if ($n == 0)
{
$query = (int) ($path != '/'); // / always has fs_id == 1, no need to query it ($path=='/' needs fs_dir=0!)
}
elseif ($n < count($parts)-1)
{
$query = 'SELECT fs_id FROM '.self::TABLE.' WHERE fs_dir=('.$query.') AND fs_name='.self::$pdo->quote($name);
// if we are not root, we need to make sure the user has the right to tranverse all partent directories (read-rights)
if (!egw_vfs::$is_root)
{
$query .= ' AND '.self::_sql_readable();
}
}
else
{
$query = str_replace('fs_name=?','fs_name='.self::$pdo->quote($name),$base_query).'('.$query.')';
}
}
$query = "/* sqlfs::url_stat($path) */ ".$query;
//echo "query=$query\n";
if (!($result = self::$pdo->query($query)) || !($info = $result->fetch(PDO::FETCH_ASSOC)))
{
self::_remove_password($url);
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$url',$flags) file or directory not found!");
return false;
}
self::$stat_cache[$path] = $info;
return self::_vfsinfo2stat($info);
}
/**
* Return readable check as sql (to be AND'ed into the query), only use if !egw_vfs::$is_root
*
* @return string
*/
private function _sql_readable()
{
static $sql_read_acl;
if (is_null($sql_read_acl))
{
foreach($GLOBALS['egw']->accounts->memberships(egw_vfs::$user,true) as $gid)
{
$memberships[] = abs($gid); // sqlfs stores the gid's positiv
}
$sql_read_acl = '(fs_mode & 04 OR fs_mode & 0400 AND fs_uid='.(int)egw_vfs::$user.
' OR fs_mode & 040 AND fs_gid IN('.implode(',',$memberships).'))';
}
return $sql_read_acl;
}
/**
* This method is called in response to readdir().
*
* It should return a string representing the next filename in the location opened by dir_opendir().
*
* @return string
*/
function dir_readdir ( )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."( )");
if (!is_array($this->opened_dir)) return false;
$file = current($this->opened_dir); next($this->opened_dir);
return $file;
}
/**
* This method is called in response to rewinddir().
*
* It should reset the output generated by dir_readdir(). i.e.:
* The next call to dir_readdir() should return the first entry in the location returned by dir_opendir().
*
* @return boolean
*/
function dir_rewinddir ( )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."( )");
if (!is_array($this->opened_dir)) return false;
reset($this->opened_dir);
return true;
}
/**
* This method is called in response to closedir().
*
* You should release any resources which were locked or allocated during the opening and use of the directory stream.
*
* @return boolean
*/
function dir_closedir ( )
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."( )");
if (!is_array($this->opened_dir)) return false;
$this->opened_dir = null;
return true;
}
/**
* Convert a sqlfs-file-info into a stat array
*
* @param array $info
* @return array
*/
static private function _vfsinfo2stat($info)
{
$stat = array(
'ino' => $info['fs_id'],
'name' => $info['fs_name'],
'mode' => $info['fs_mode'] |
($info['fs_mime'] == self::DIR_MIME_TYPE ? self::MODE_DIR : self::MODE_FILE), // required by the stream wrapper
'size' => $info['fs_size'],
'uid' => $info['fs_uid'],
'gid' => $info['fs_gid'],
'mtime' => strtotime($info['fs_modified']),
'ctime' => strtotime($info['fs_created']),
'nlink' => $info['fs_mime'] == self::DIR_MIME_TYPE ? 2 : 1,
// eGW addition to return the mime type
'mime' => $info['fs_mime'],
);
//error_log(__METHOD__."($info[name]) = ".print_r($stat,true));
return $stat;
}
/**
* Create pdo object / connection, as long as pdo is not generally used in eGW
*
* @return PDO
*/
static private function _pdo()
{
$server =& $GLOBALS['egw_info']['server'];
switch($server['db_type'])
{
default:
$dsn = $server['db_type'].':host='.$server['db_host'].';dbname='.$server['db_name'];
break;
}
self::$pdo = new PDO($dsn,$server['db_user'],$server['db_pass']);
// set client charset of the connection
$charset = $GLOBALS['egw']->translation->charset();
switch($server['db_type'])
{
case 'mysql':
if (isset($GLOBALS['egw']->db->Link_ID->charset2mysql[$charset])) $charset = $GLOBALS['egw']->db->Link_ID->charset2mysql[$charset];
// fall throught
case 'pgsql':
$query = "SET NAMES '$charset'";
break;
}
if ($query)
{
self::$pdo->exec($query);
}
return self::$pdo;
}
/**
* Just a little abstration 'til I know how to organise stuff like that with PDO
*
* @param mixed $time
* @return string Y-m-d H:i:s
*/
static private function _pdo_timestamp($time)
{
if (is_numeric($time))
{
$time = date('Y-m-d H:i:s',$time);
}
return $time;
}
/**
* Return the path of the stored content of a file if $this->operation == self::STORE2FS
*
* @param string $path
* @return string
*/
static private function _fs_path($path)
{
return $GLOBALS['egw_info']['server']['files_dir'].$path;
}
/**
* Replace the password of an url with '...' for error messages
*
* @param string &$url
*/
static private function _remove_password(&$url)
{
$parts = parse_url($url);
if ($parts['pass'] || $parts['scheme'])
{
$url = $parts['scheme'].'://'.($parts['user'] ? $parts['user'].($parts['pass']?':...':'').'@' : '').
$parts['host'].$parts['path'];
}
}
}
stream_register_wrapper(sqlfs_stream_wrapper::SCHEME ,'sqlfs_stream_wrapper');
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