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<?php
# Lifter007: TODO
# Lifter003: TODO
# Lifter010: TODO
/**
* SessionDecoder.class.php
*
* decodes serialized PHP session data
*
* @author André Noack <noack@data-quest>, Suchi & Berg GmbH <info@data-quest.de>
* @access public
* @package core
*/
// +---------------------------------------------------------------------------+
// This file is part of Stud.IP
// SessionDecoder.class.php
//
// Copyright (C) 2008 André Noack <noack@data-quest>, data-quest GmbH <info@data-quest.de>
// +---------------------------------------------------------------------------+
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or any later version.
// +---------------------------------------------------------------------------+
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// +---------------------------------------------------------------------------+
class SessionDecoder implements ArrayAccess, Countable, Iterator {
private $encoded_session = [];
private $decoded_session = [];
private $var_names = [];
/**
* Usage:
* Pass the string containing encoded session data to the
* constructor, the identified session variables become public members
* of the object
*
* $session = new SessionDecoder($encoded_session_string);
* print_r($session->my_var);
* or
* print_r($session['my_var']);
* get the names of identified variables
* print_r($session->keys());
*
* @param string $encoded_session_string
*/
public function __construct($encoded_session_string) {
$this->decode($encoded_session_string);
}
/**
* pass an encoded session string to fill the object
*
* @param string $encoded_session_string
* @return int number of identified variables
*/
public function decode($encoded_session_string){
$this->encoded_session = $this->sessionRealDecode($encoded_session_string);
if(is_array($this->encoded_session)) {
$this->var_names = array_keys($this->encoded_session);
} else {
$this->encoded_session = [];
}
$this->decoded_session = [];
return count($this->encoded_session);
}
/**
* returns an array containing the names of the identified variables
*
* @return array names of identified variables
*/
public function keys() {
return $this->var_names;
}
public function rewind() {
reset($this->var_names);
}
public function current() {
$current = current($this->var_names);
return $current !== false ? $this->offsetGet($current) : false;
}
public function key() {
return current($this->var_names);
}
public function next() {
$next = next($this->var_names);
return $this->current();
}
public function valid() {
$current = current($this->var_names);
return $current !== false;
}
public function offsetExists($offset){
return isset($this->encoded_session[$offset]);
}
public function offsetGet($offset){
if($this->offsetExists($offset) && !isset($this->decoded_session[$offset])){
$this->decoded_session[$offset] = unserialize($this->encoded_session[$offset]);
}
return isset($this->decoded_session[$offset]) ? $this->decoded_session[$offset] : null;
}
public function offsetSet($offset, $value) {}
public function offsetUnset($offset) {}
public function count(){
return count($this->var_names);
}
public function __get($name){
return $this->offsetGet($name);
}
public function __isset($name){
return $this->offsetExists($name);
}
/**
* a function that returns decoded session data,
* that seems to work in every cases,
* even when strings contain reserved chars
* (c) bmorel at ssi dot fr
* http://www.php.net/manual/en/function.session-decode.php#56106
*
* @param string $str
* @return array
*/
private function sessionRealDecode($str) {
$ret = [];
$PS_DELIMITER = '|';
$PS_UNDEF_MARKER = '!';
$str = (string)$str;
$endptr = strlen($str);
$p = 0;
$items = 0;
$level = 0;
while ($p < $endptr) {
$q = $p;
while ($str[$q] != $PS_DELIMITER)
if (++$q >= $endptr) break 2;
if ($str[$p] == $PS_UNDEF_MARKER) {
$p++;
$has_value = false;
} else {
$has_value = true;
}
$name = substr($str, $p, $q - $p);
$q++;
$serialized = '';
if ($has_value) {
for (;;) {
$p = $q;
switch ($str[$q]) {
case 'N': /* null */
case 'b': /* boolean */
case 'i': /* integer */
case 'd': /* decimal */
do $q++;
while ( ($q < $endptr) && ($str[$q] != ';') );
$q++;
$serialized .= substr($str, $p, $q - $p);
if ($level == 0) break 2;
break;
case 'R': /* reference */
$q+= 2;
for ($id = ''; ($q < $endptr) && ($str[$q] != ';'); $q++) $id .= $str[$q];
$q++;
//$serialized .= 'R:' . ($id + 1) . ';'; /* increment pointer because of outer array */
$serialized .= 'N;'; /* unserializing references is not possible*/
if ($level == 0) break 2;
break;
case 's': /* string */
$q+=2;
for ($length=''; ($q < $endptr) && ($str[$q] != ':'); $q++) $length .= $str[$q];
$q+=2;
$q+= (int)$length + 2;
$serialized .= substr($str, $p, $q - $p);
if ($level == 0) break 2;
break;
case 'a': /* array */
case 'O': /* object */
do $q++;
while ( ($q < $endptr) && ($str[$q] != '{') );
$q++;
$level++;
$serialized .= substr($str, $p, $q - $p);
break;
case '}': /* end of array|object */
$q++;
$serialized .= substr($str, $p, $q - $p);
if (--$level == 0) break 2;
break;
default:
return false;
}
}
} else {
$serialized .= 'N;';
$q+= 2;
}
$items++;
$p = $q;
$ret[$name] = $serialized;
}
return $ret;
}
}
?>
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