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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Session
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  * @since      Preview Release 0.2
  */
 
 
 /**
  * @see Zend_Session
  */
 // require_once 'Zend/Session.php';
 
 
 /**
  * @see Zend_Session_Abstract
  */
 // require_once 'Zend/Session/Abstract.php';
 
 
 /**
  * Zend_Session_Namespace
  *
  * @category   Zend
  * @package    Zend_Session
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Session_Namespace extends Zend_Session_Abstract implements IteratorAggregate
 {
 
     /**
      * used as option to constructor to prevent additional instances to the same namespace
      */
     const SINGLE_INSTANCE = true;
 
     /**
      * Namespace - which namespace this instance of zend-session is saving-to/getting-from
      *
      * @var string
      */
     protected $_namespace = "Default";
 
     /**
      * Namespace locking mechanism
      *
      * @var array
      */
     protected static $_namespaceLocks = array();
 
     /**
      * Single instance namespace array to ensure data security.
      *
      * @var array
      */
     protected static $_singleInstances = array();
 
     /**
      * resetSingleInstance()
      *
      * @param string $namespaceName
      * @return null
      */
     public static function resetSingleInstance($namespaceName = null)
     {
         if ($namespaceName != null) {
             if (array_key_exists($namespaceName, self::$_singleInstances)) {
                 unset(self::$_singleInstances[$namespaceName]);
             }
             return;
         }
 
         self::$_singleInstances = array();
         return;
     }
 
     /**
      * __construct() - Returns an instance object bound to a particular, isolated section
      * of the session, identified by $namespace name (defaulting to 'Default').
      * The optional argument $singleInstance will prevent construction of additional
      * instance objects acting as accessors to this $namespace.
      *
      * @param string $namespace       - programmatic name of the requested namespace
      * @param bool $singleInstance    - prevent creation of additional accessor instance objects for this namespace
      * @return void
      */
     public function __construct($namespace = 'Default', $singleInstance = false)
     {
         if ($namespace === '') {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception('Session namespace must be a non-empty string.');
         }
 
         if ($namespace[0] == "_") {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception('Session namespace must not start with an underscore.');
         }
 
         if (preg_match('#(^[0-9])#i', $namespace[0])) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception('Session namespace must not start with a number.');
         }
 
         if (isset(self::$_singleInstances[$namespace])) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception("A session namespace object already exists for this namespace ('$namespace'), and no additional accessors (session namespace objects) for this namespace are permitted.");
         }
 
         if ($singleInstance === true) {
             self::$_singleInstances[$namespace] = true;
         }
 
         $this->_namespace = $namespace;
 
         // Process metadata specific only to this namespace.
         Zend_Session::start(true); // attempt auto-start (throws exception if strict option set)
 
         if (self::$_readable === false) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception(self::_THROW_NOT_READABLE_MSG);
         }
 
         if (!isset($_SESSION['__ZF'])) {
             return; // no further processing needed
         }
 
         // do not allow write access to namespaces, after stop() or writeClose()
         if (parent::$_writable === true) {
             if (isset($_SESSION['__ZF'][$namespace])) {
 
                 // Expire Namespace by Namespace Hop (ENNH)
                 if (isset($_SESSION['__ZF'][$namespace]['ENNH'])) {
                     $_SESSION['__ZF'][$namespace]['ENNH']--;
 
                     if ($_SESSION['__ZF'][$namespace]['ENNH'] === 0) {
                         if (isset($_SESSION[$namespace])) {
                             self::$_expiringData[$namespace] = $_SESSION[$namespace];
                             unset($_SESSION[$namespace]);
                         }
                         unset($_SESSION['__ZF'][$namespace]);
                     }
                 }
 
                 // Expire Namespace Variables by Namespace Hop (ENVNH)
                 if (isset($_SESSION['__ZF'][$namespace]['ENVNH'])) {
                     foreach ($_SESSION['__ZF'][$namespace]['ENVNH'] as $variable => $hops) {
                         $_SESSION['__ZF'][$namespace]['ENVNH'][$variable]--;
 
                         if ($_SESSION['__ZF'][$namespace]['ENVNH'][$variable] === 0) {
                             if (isset($_SESSION[$namespace][$variable])) {
                                 self::$_expiringData[$namespace][$variable] = $_SESSION[$namespace][$variable];
                                 unset($_SESSION[$namespace][$variable]);
                             }
                             unset($_SESSION['__ZF'][$namespace]['ENVNH'][$variable]);
                         }
                     }
                     if(empty($_SESSION['__ZF'][$namespace]['ENVNH'])) {
                         unset($_SESSION['__ZF'][$namespace]['ENVNH']);
                     }
                 }
             }
 
             if (empty($_SESSION['__ZF'][$namespace])) {
                 unset($_SESSION['__ZF'][$namespace]);
             }
 
             if (empty($_SESSION['__ZF'])) {
                 unset($_SESSION['__ZF']);
             }
         }
     }
 
 
     /**
      * getIterator() - return an iteratable object for use in foreach and the like,
      * this completes the IteratorAggregate interface
      *
      * @return ArrayObject - iteratable container of the namespace contents
      */
     public function getIterator()
     {
         return new ArrayObject(parent::_namespaceGetAll($this->_namespace));
     }
 
 
     /**
      * lock() - mark a session/namespace as readonly
      *
      * @return void
      */
     public function lock()
     {
         self::$_namespaceLocks[$this->_namespace] = true;
     }
 
 
     /**
      * unlock() - unmark a session/namespace to enable read & write
      *
      * @return void
      */
     public function unlock()
     {
         unset(self::$_namespaceLocks[$this->_namespace]);
     }
 
 
     /**
      * unlockAll() - unmark all session/namespaces to enable read & write
      *
      * @return void
      */
     public static function unlockAll()
     {
         self::$_namespaceLocks = array();
     }
 
 
     /**
      * isLocked() - return lock status, true if, and only if, read-only
      *
      * @return bool
      */
     public function isLocked()
     {
         return isset(self::$_namespaceLocks[$this->_namespace]);
     }
 
 
     /**
      * unsetAll() - unset all variables in this namespace
      *
      * @return true
      */
     public function unsetAll()
     {
         return parent::_namespaceUnset($this->_namespace);
     }
 
 
     /**
      * __get() - method to get a variable in this object's current namespace
      *
      * @param string $name - programmatic name of a key, in a <key,value> pair in the current namespace
      * @return mixed
      */
     public function & __get($name)
     {
         if ($name === '') {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception("The '$name' key must be a non-empty string");
         }
 
         return parent::_namespaceGet($this->_namespace, $name);
     }
 
 
     /**
      * __set() - method to set a variable/value in this object's namespace
      *
      * @param string $name - programmatic name of a key, in a <key,value> pair in the current namespace
      * @param mixed $value - value in the <key,value> pair to assign to the $name key
      * @throws Zend_Session_Exception
      * @return true
      */
     public function __set($name, $value)
     {
         if (isset(self::$_namespaceLocks[$this->_namespace])) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception('This session/namespace has been marked as read-only.');
         }
 
         if ($name === '') {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception("The '$name' key must be a non-empty string");
         }
 
         if (parent::$_writable === false) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception(parent::_THROW_NOT_WRITABLE_MSG);
         }
 
         $name = (string) $name;
 
         $_SESSION[$this->_namespace][$name] = $value;
     }
 
 
     /**
      * apply() - enables applying user-selected function, such as array_merge() to the namespace
      * Parameters following the $callback argument are passed to the callback function.
      * Caveat: ignores members expiring now.
      *
      * Example:
      *   $namespace->apply('array_merge', array('tree' => 'apple', 'fruit' => 'peach'), array('flower' => 'rose'));
      *   $namespace->apply('count');
      *
      * @param string|array $callback - callback function
      */
     public function apply($callback)
     {
         $arg_list = func_get_args();
         $arg_list[0] = $_SESSION[$this->_namespace];
         return call_user_func_array($callback, $arg_list);
     }
 
 
     /**
      * applySet() - enables applying user-selected function, and sets entire namespace to the result
      * Result of $callback must be an array.
      * Parameters following the $callback argument are passed to the callback function.
      * Caveat: ignores members expiring now.
      *
      * Example:
      *   $namespace->applySet('array_merge', array('tree' => 'apple', 'fruit' => 'peach'), array('flower' => 'rose'));
      *
      * @param string|array $callback - callback function
      */
     public function applySet($callback)
     {
         $arg_list = func_get_args();
         $arg_list[0] = $_SESSION[$this->_namespace];
         $result = call_user_func_array($callback, $arg_list);
         if (!is_array($result)) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception('Result must be an array. Got: ' . gettype($result));
         }
         $_SESSION[$this->_namespace] = $result;
         return $result;
     }
 
 
     /**
      * __isset() - determine if a variable in this object's namespace is set
      *
      * @param string $name - programmatic name of a key, in a <key,value> pair in the current namespace
      * @return bool
      */
     public function __isset($name)
     {
         if ($name === '') {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception("The '$name' key must be a non-empty string");
         }
 
         return parent::_namespaceIsset($this->_namespace, $name);
     }
 
 
     /**
      * __unset() - unset a variable in this object's namespace.
      *
      * @param string $name - programmatic name of a key, in a <key,value> pair in the current namespace
      * @return true
      */
     public function __unset($name)
     {
         if ($name === '') {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception("The '$name' key must be a non-empty string");
         }
 
         return parent::_namespaceUnset($this->_namespace, $name);
     }
 
 
     /**
      * setExpirationSeconds() - expire the namespace, or specific variables after a specified
      * number of seconds
      *
      * @param int $seconds     - expires in this many seconds
      * @param mixed $variables - OPTIONAL list of variables to expire (defaults to all)
      * @throws Zend_Session_Exception
      * @return void
      */
     public function setExpirationSeconds($seconds, $variables = null)
     {
         if (parent::$_writable === false) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception(parent::_THROW_NOT_WRITABLE_MSG);
         }
 
         if ($seconds <= 0) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception('Seconds must be positive.');
         }
 
         if ($variables === null) {
 
             // apply expiration to entire namespace
             $_SESSION['__ZF'][$this->_namespace]['ENT'] = time() + $seconds;
 
         } else {
 
             if (is_string($variables)) {
                 $variables = array($variables);
             }
 
             foreach ($variables as $variable) {
                 if (!empty($variable)) {
                     $_SESSION['__ZF'][$this->_namespace]['ENVT'][$variable] = time() + $seconds;
                 }
             }
         }
     }
 
 
     /**
      * setExpirationHops() - expire the namespace, or specific variables after a specified
      * number of page hops
      *
      * @param int $hops        - how many "hops" (number of subsequent requests) before expiring
      * @param mixed $variables - OPTIONAL list of variables to expire (defaults to all)
      * @param boolean $hopCountOnUsageOnly - OPTIONAL if set, only count a hop/request if this namespace is used
      * @throws Zend_Session_Exception
      * @return void
      */
     public function setExpirationHops($hops, $variables = null, $hopCountOnUsageOnly = false)
     {
         if (parent::$_writable === false) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception(parent::_THROW_NOT_WRITABLE_MSG);
         }
 
         if ($hops <= 0) {
             /**
              * @see Zend_Session_Exception
              */
             // require_once 'Zend/Session/Exception.php';
             throw new Zend_Session_Exception('Hops must be positive number.');
         }
 
         if ($variables === null) {
 
             // apply expiration to entire namespace
             if ($hopCountOnUsageOnly === false) {
                 $_SESSION['__ZF'][$this->_namespace]['ENGH'] = $hops;
             } else {
                 $_SESSION['__ZF'][$this->_namespace]['ENNH'] = $hops;
             }
 
         } else {
 
             if (is_string($variables)) {
                 $variables = array($variables);
             }
 
             foreach ($variables as $variable) {
                 if (!empty($variable)) {
                     if ($hopCountOnUsageOnly === false) {
                         $_SESSION['__ZF'][$this->_namespace]['ENVGH'][$variable] = $hops;
                     } else {
                         $_SESSION['__ZF'][$this->_namespace]['ENVNH'][$variable] = $hops;
                     }
                 }
             }
         }
     }
 
     /**
      * Returns the namespace name
      *
      * @return string
      */
     public function getNamespace()
     {
         return $this->_namespace;
     }
 }