egroupware_official/etemplate/inc/class.etemplate_request.inc.php

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<?php
/**
* eGroupWare - eTemplate request object storing request-data directly in the form itself
*
* @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) 2007-9 by Ralf Becker <RalfBecker@outdoor-training.de>
* @version $Id$
*/
/**
* Class to represent the persitent information of an eTemplate request
*
* This class stores the request-data direct in a hidden var in the form.
* As this would allow an evil user to manipulate it and therefore compromise the security
* of an EGroupware instance, this class should only be used, if mcrypt is available
* to encrypt that data. The factory method etemplate_request::read() ensures that,
* by using etemplate_request_session instead.
*
* The key used to encrypt the request can be set in header.inc.php by setting
*
* $GLOBALS['egw_info']['server']['etemplate_form_key'] = 'something secret';
*
* if this var is not set, the db_pass and EGW_SERVER_ROOT is used instead.
*
* The request object should be instancated only via the factory method etemplate::request($id=null)
*
* $request = etemplate::request();
*
* // add request data
*
* $id = $request->id();
*
* b) open or modify an existing request:
*
* if (!($request = etemplate::request($id)))
* {
* // request not found
* }
*
* Ajax requests can use this object to open the original request by using the id, they have to transmitt back,
* and register further variables, modify the registered ones or delete them AND then update the id, if it changed:
*
* if (($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
{
/**
* here is the request data stored
*
* @var array
*/
protected $data=array();
/**
* Flag if data has been modified and therefor need to be stored again in the session
*
* @var boolean
*/
protected $data_modified=false;
/**
* mcrypt resource
*
* @var resource
*/
static protected $mcrypt;
/**
* See gzcompress, set it to 0 to not compress
*
* @var int
*/
static public $compression_level = 6;
/**
* Name of request class used
*
* Can be set here to force a certain class, otherwise the factory method chooses one
*
* @var string
*/
static public $request_class; // = 'etemplate_request_session';
/**
* Factory method to get a new request object or the one for an existing request
*
* If mcrypt AND gzcompress is available this factory method chooses etemplate_request,
* which stores the request data encrypted in a hidden var directly in the form,
* over etemplate_request_session, which stores the data in the session (and causing
* the sesison to constantly grow).
*
* @param string $id=null
* @return etemplate_request
*/
public static function read($id=null)
{
if (is_null(self::$request_class))
{
self::$request_class = check_load_extension('mcrypt') && function_exists('gzcompress') &&
self::init_crypt() ? __CLASS__ : 'etemplate_request_session';
}
if (self::$request_class != __CLASS__)
{
return call_user_method('read',self::$request_class,$id);
}
$request = new etemplate_request();
if (!is_null($id))
{
$id = base64_decode($id);
// decrypt the data if available
if (self::init_crypt())
{
$id = mdecrypt_generic(self::$mcrypt,$id);
}
// uncompress the data if available
if (self::$compression_level && function_exists('gzcompress'))
{
//$len_compressed = bytes($id);
//$time = microtime(true);
$id = gzuncompress($id);
//$time = number_format(1000.0 * (microtime(true) - $time),1);
//$len_uncompressed = bytes($id);
//error_log(__METHOD__."() uncompressed from $len_compressed to $len_uncompressed bytes $time ms");
}
$request->data = unserialize($id);
if (!$request->data)
{
error_log(__METHOD__."() id not valid!");
return false;
}
//error_log(__METHOD__."() size of request = ".bytes($id));
}
return $request;
}
/**
* Private constructor to force the instancation of this class only via it's static factory method read
*
* @param string $id=null
*/
private function __construct($id=null)
{
}
/**
* return the id of this request
*
* @return string
*/
public function &id()
{
$id = serialize($this->data);
// compress the data if available
if (self::$compression_level && function_exists('gzcompress'))
{
//$len_uncompressed = bytes($id);
//$time = microtime(true);
$id = gzcompress($id,self::$compression_level);
//$time = number_format(1000.0 * (microtime(true) - $time),1);
//$len_compressed = bytes($id);
//error_log(__METHOD__."() compressed from $len_uncompressed to $len_compressed bytes in $time ms");
}
// encrypt the data if available
if (self::init_crypt())
{
$id = mcrypt_generic(self::$mcrypt,$id);
}
$id = base64_encode($id);
//error_log(__METHOD__."() #$this->id: size of request = ".bytes($id));//.", id='$id'");
//self::debug();
return $id;
}
/**
* Register a form-variable to be processed
*
* @param string $form_name form-name
* @param string $type etemplate type
* @param array $data=array() optional extra data
*/
public function set_to_process($form_name,$type,$data=array())
{
if (!$form_name || !$type) return;
$data['type'] = $type;
$this->data['to_process'][$form_name] = $data;
$this->data_modified = true;
}
/**
* Set an attribute of a to-process record
*
* @param string $form_name form-name
* @param string $attribute etemplate type
* @param array $value
* @param boolean $add_to_array=false should $value be added to the attribute array
*/
public function set_to_process_attribute($form_name,$attribute,$value,$add_to_array=false)
{
if (!$form_name) return;
if ($add_to_array)
{
$this->data['to_process'][$form_name][$attribute][] = $value;
}
else
{
$this->data['to_process'][$form_name][$attribute] = $value;
}
$this->data_modified = true;
}
/**
* Unregister a form-variable to be no longer processed
*
* @param string $form_name form-name
*/
public function unset_to_process($form_name)
{
unset($this->data['to_process'][$form_name]);
$this->data_modified = true;
}
/**
* return the data of a form-var to process or the whole array
*
* @param string $form_name=null
* @return array
*/
public function get_to_process($form_name=null)
{
return $form_name ? $this->data['to_process'][$form_name] : $this->data['to_process'];
}
/**
* check if something set for a given $form_name
*
* @param string $form_name
* @return boolean
*/
public function isset_to_process($form_name)
{
return isset($this->data['to_process'][$form_name]);
}
/**
* magic function to set all request-vars, used eg. as $request->method = 'app.class.method';
*
* @param string $var
* @param mixed $val
*/
public function __set($var,$val)
{
if ($this->data[$var] !== $val)
{
$this->data[$var] = $val;
$this->data_modified = true;
}
}
/**
* magic function to access the request-vars, used eg. as $method = $request->method;
*
* @param string $var
* @return mixed
*/
public function &__get($var)
{
return $this->data[$var];
}
/**
* magic function to see if a request-var has been set
*
* @param string $var
* @return boolean
*/
public function __isset($var)
{
return array_key_exists($var, $this->data);
}
/**
* Get the names / keys of existing variables
*
* @return array
*/
public function names()
{
return array_keys($this->data);
}
/**
* Output the size-wise important parts of a request
*
* @param double $min_share minimum share to be reported (in percent of the whole request)
* @param double $dump_share minimum share from which on a variable get output
*/
public function debug($min_share=1.0,$dump_share=25.0)
{
echo "<p><b>total size request data = ".($total=strlen(serialize($this->data)))."</b></p>\n";
echo "<p>shares bigger then $min_share% percent of it:</p>\n";
foreach($this->data as $key => $val)
{
$len = strlen(is_array($val) ? serialize($val) : $val);
$len .= ' ('.sprintf('%2.1lf',($percent = 100.0 * $len / $total)).'%)';
if ($percent < $min_share) continue;
echo "<p><b>$key</b>: strlen(\$val)=$len</p>\n";
if ($percent >= $dump_share) _debug_array($val);
if (is_array($val) && $len > 2000)
{
foreach($val as $k => $v)
{
$l = strlen(is_array($v) ? serialize($v) : $v);
$l .= ' ('.sprintf('%2.1lf',($p = 100.0 * $l / $total)).'%)';
if ($p < $min_share) continue;
echo "<p>&nbsp;- {$key}[$k]: strlen(\$v)=$l</p>\n";
}
}
}
}
/**
* Check if session encryption is configured, possible and initialise it
*
* @param string $algo='tripledes'
* @param string $mode='ecb'
* @return boolean true if encryption is used, false otherwise
*/
static public function init_crypt($algo='tripledes',$mode='ecb')
{
if (is_null(self::$mcrypt))
{
if (isset($GLOBALS['egw_info']['server']['etemplate_form_key']))
{
$key = $GLOBALS['egw_info']['server']['etemplate_form_key'];
}
else
{
$key = $GLOBALS['egw_info']['server']['db_pass'].EGW_SERVER_ROOT;
}
if (!check_load_extension('mcrypt'))
{
error_log(__METHOD__."() required PHP extension mcrypt not loaded and can not be loaded, eTemplate requests get NOT encrypted!");
return false;
}
if (!(self::$mcrypt = mcrypt_module_open($algo, '', $mode, '')))
{
error_log(__METHOD__."() could not mcrypt_module_open(algo='$algo','',mode='$mode',''), eTemplate requests get NOT encrypted!");
return false;
}
$iv_size = mcrypt_enc_get_iv_size(self::$mcrypt);
$iv = !isset($GLOBALS['egw_info']['server']['mcrypt_iv']) || strlen($GLOBALS['egw_info']['server']['mcrypt_iv']) < $iv_size ?
mcrypt_create_iv ($iv_size, MCRYPT_RAND) : substr($GLOBALS['egw_info']['server']['mcrypt_iv'],0,$iv_size);
$key_size = mcrypt_enc_get_key_size(self::$mcrypt);
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if (strlen($key) > $key_size) $key = substr($key,0,$key_size-1);
if (mcrypt_generic_init(self::$mcrypt,$key, $iv) < 0)
{
error_log(__METHOD__."() could not initialise mcrypt, sessions get NOT encrypted!");
return self::$mcrypt = false;
}
}
return is_resource(self::$mcrypt);
}
/**
* Destructor
*/
function __destruct()
{
if (self::$mcrypt)
{
mcrypt_generic_deinit(self::$mcrypt);
self::$mcrypt = null;
}
}
}