egroupware/etemplate/inc/class.etemplate_request_files.inc.php

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<?php
/**
* eGroupWare - eTemplate request object storing the data in the filesystem
*
* @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
* @package etemplate
* @subpackage api
* @link http://www.egroupware.org
* @author Ralf Becker <RalfBecker@outdoor-training.de>
* @copyright (c) 2009 by Ralf Becker <RalfBecker@outdoor-training.de>
* @version $Id$
*/
/**
* Class to represent the persitent information stored on the server for each eTemplate request
*
* The information is stored in the filesystem. The admin has to take care of regulary cleaning of
* the used directory, as old requests get NOT deleted by this handler.
*
* To enable the use of this handler, you have to set (in etemplate/inc/class.etemplate_request.inc.php):
*
* etemplate_request::$request_class = 'etemplate_request_files';
*
* The request object should be instancated only via the factory method etemplate_request::read($id=null)
*
* $request = etemplate_request::read();
*
* // add request data
*
* $id = $request->id();
*
* b) open or modify an existing request:
*
* if (!($request = etemplate_request::read($id)))
* {
* // request not found
* }
*
* Ajax requests can use this object to open the original request by using the id, they have to transmitt back,
* and register further variables, modify the registered ones or delete them AND then update the id, if it changed:
*
* if (($new_id = $request->id()) != $id)
* {
* $response->addAssign('etemplate_exec_id','value',$new_id);
* }
*
* For an example look in link_widget::ajax_search()
*/
class etemplate_request_files extends etemplate_request
{
/**
* request id
*
* @var string
*/
protected $id;
/**
* Name of the directory to store the request data, by default $GLOBALS['egw_info']['server']['temp_dir']
*
* @var string
*/
static public $directory;
/**
* Private constructor to force the instancation of this class only via it's static factory method read
*
* @param array $id
*/
private function __construct($id=null)
{
if (is_null(self::$directory))
{
self::$directory = $GLOBALS['egw_info']['server']['temp_dir'];
}
if (!$id) $id = self::request_id();
$this->id = $id;
}
/**
* return the id of this request
*
* @return string
*/
public function id()
{
//error_log(__METHOD__."() id=$this->id");
return $this->id;
}
/**
* Factory method to get a new request object or the one for an existing request
*
* @param string $id=null
* @return etemplate_request|boolean the object or false if $id is not found
*/
static function read($id=null)
{
$request = new etemplate_request_files($id);
if (!is_null($id))
{
if (!file_exists($filename = self::$directory.'/'.$id) || !is_readable($filename))
{
error_log("Error opening '$filename' to read the etemplate request data!");
return false;
}
$request->data = unserialize(file_get_contents($filename));
if ($request->data === false) error_log("Error unserializing '$filename' to read the etemplate request data!");
}
//error_log(__METHOD__."(id=$id");
return $request;
}
/**
* creates a new request-id via microtime()
*
* @return string
*/
static function request_id()
{
do
{
$id = uniqid('etemplate_'.$GLOBALS['egw_info']['flags']['currentapp'].'_',true);
}
while (file_exists(self::$directory.'/'.$id));
return $id;
}
/**
* saves content,readonlys,template-keys, ... via eGW's appsession function
*
* As a user may open several windows with the same content/template wie generate a location-id from microtime
* which is used as location for request to descriminate between the different windows. This location-id
* is then saved as a hidden-var in the form. The above mentions session-id has nothing to do / is different
* from the session-id which is constant for all windows opened in one session.
*/
function __destruct()
{
if (!file_put_contents($filename = self::$directory.'/'.$this->id,serialize($this->data)))
{
error_log("Error opening '$filename' to store the etemplate request data!");
}
}
}