Merge branch 'master' of https://github.com/roundcube/roundcubemail

1 files changed, 653 insertions, 569 deletions

diff --git a/program/lib/Roundcube/rcube_session.php b/program/lib/Roundcube/rcube_session.php
index fdbf668ca..dedde2284 100644
--- a/program/lib/Roundcube/rcube_session.php
+++ b/program/lib/Roundcube/rcube_session.php
@@ -2,8 +2,6 @@
 
 /*
  +-----------------------------------------------------------------------+
- | program/include/rcube_session.php                                     |
- |                                                                       |
  | This file is part of the Roundcube Webmail client                     |
  | Copyright (C) 2005-2012, The Roundcube Dev Team                       |
  | Copyright (C) 2011, Kolab Systems AG                                  |
@@ -14,7 +12,6 @@
  |                                                                       |
  | PURPOSE:                                                              |
  |   Provide database supported session management                       |
- |                                                                       |
  +-----------------------------------------------------------------------+
  | Author: Thomas Bruederli <roundcube@gmail.com>                        |
  | Author: Aleksander Machniak <alec@alec.pl>                            |
@@ -31,602 +28,689 @@
  */
 class rcube_session
 {
-  private $db;
-  private $ip;
-  private $start;
-  private $changed;
-  private $unsets = array();
-  private $gc_handlers = array();
-  private $cookiename = 'roundcube_sessauth';
-  private $vars;
-  private $key;
-  private $now;
-  private $secret = '';
-  private $ip_check = false;
-  private $logging = false;
-  private $memcache;
-
-  /**
-   * Default constructor
-   */
-  public function __construct($db, $config)
-  {
-    $this->db      = $db;
-    $this->start   = microtime(true);
-    $this->ip      = $_SERVER['REMOTE_ADDR'];
-    $this->logging = $config->get('log_session', false);
-
-    $lifetime = $config->get('session_lifetime', 1) * 60;
-    $this->set_lifetime($lifetime);
-
-    // use memcache backend
-    if ($config->get('session_storage', 'db') == 'memcache') {
-      $this->memcache = rcube::get_instance()->get_memcache();
-
-      // set custom functions for PHP session management if memcache is available
-      if ($this->memcache) {
-        session_set_save_handler(
-          array($this, 'open'),
-          array($this, 'close'),
-          array($this, 'mc_read'),
-          array($this, 'mc_write'),
-          array($this, 'mc_destroy'),
-          array($this, 'gc'));
-      }
-      else {
-        rcube::raise_error(array('code' => 604, 'type' => 'db',
-          'line' => __LINE__, 'file' => __FILE__,
-          'message' => "Failed to connect to memcached. Please check configuration"),
-          true, true);
-      }
+    private $db;
+    private $ip;
+    private $start;
+    private $changed;
+    private $reloaded = false;
+    private $unsets = array();
+    private $gc_handlers = array();
+    private $cookiename = 'roundcube_sessauth';
+    private $vars;
+    private $key;
+    private $now;
+    private $secret = '';
+    private $ip_check = false;
+    private $logging = false;
+    private $memcache;
+
+
+    /**
+     * Default constructor
+     */
+    public function __construct($db, $config)
+    {
+        $this->db      = $db;
+        $this->start   = microtime(true);
+        $this->ip      = $_SERVER['REMOTE_ADDR'];
+        $this->logging = $config->get('log_session', false);
+
+        $lifetime = $config->get('session_lifetime', 1) * 60;
+        $this->set_lifetime($lifetime);
+
+        // use memcache backend
+        if ($config->get('session_storage', 'db') == 'memcache') {
+            $this->memcache = rcube::get_instance()->get_memcache();
+
+            // set custom functions for PHP session management if memcache is available
+            if ($this->memcache) {
+                session_set_save_handler(
+                    array($this, 'open'),
+                    array($this, 'close'),
+                    array($this, 'mc_read'),
+                    array($this, 'mc_write'),
+                    array($this, 'mc_destroy'),
+                    array($this, 'gc'));
+            }
+            else {
+                rcube::raise_error(array('code' => 604, 'type' => 'db',
+                    'line' => __LINE__, 'file' => __FILE__,
+                    'message' => "Failed to connect to memcached. Please check configuration"),
+                true, true);
+            }
+        }
+        else {
+            // set custom functions for PHP session management
+            session_set_save_handler(
+                array($this, 'open'),
+                array($this, 'close'),
+                array($this, 'db_read'),
+                array($this, 'db_write'),
+                array($this, 'db_destroy'),
+                array($this, 'db_gc'));
+        }
     }
-    else {
-      // set custom functions for PHP session management
-      session_set_save_handler(
-        array($this, 'open'),
-        array($this, 'close'),
-        array($this, 'db_read'),
-        array($this, 'db_write'),
-        array($this, 'db_destroy'),
-        array($this, 'db_gc'));
-      }
-  }
-
-
-  public function open($save_path, $session_name)
-  {
-    return true;
-  }
-
-
-  public function close()
-  {
-    return true;
-  }
-
-
-  /**
-   * Delete session data for the given key
-   *
-   * @param string Session ID
-   */
-  public function destroy($key)
-  {
-    return $this->memcache ? $this->mc_destroy($key) : $this->db_destroy($key);
-  }
-
-
-  /**
-   * Read session data from database
-   *
-   * @param string Session ID
-   * @return string Session vars
-   */
-  public function db_read($key)
-  {
-    $sql_result = $this->db->query(
-      "SELECT vars, ip, changed FROM ".$this->db->table_name('session')
-      ." WHERE sess_id = ?", $key);
-
-    if ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
-      $this->changed = strtotime($sql_arr['changed']);
-      $this->ip      = $sql_arr['ip'];
-      $this->vars    = base64_decode($sql_arr['vars']);
-      $this->key     = $key;
-
-      return !empty($this->vars) ? (string) $this->vars : '';
+
+
+    public function open($save_path, $session_name)
+    {
+        return true;
     }
 
-    return null;
-  }
-
-
-  /**
-   * Save session data.
-   * handler for session_read()
-   *
-   * @param string Session ID
-   * @param string Serialized session vars
-   * @return boolean True on success
-   */
-  public function db_write($key, $vars)
-  {
-    $ts = microtime(true);
-    $now = $this->db->fromunixtime((int)$ts);
-
-    // no session row in DB (db_read() returns false)
-    if (!$this->key) {
-      $oldvars = null;
+
+    public function close()
+    {
+        return true;
     }
-    // use internal data from read() for fast requests (up to 0.5 sec.)
-    else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5)) {
-      $oldvars = $this->vars;
+
+
+    /**
+     * Delete session data for the given key
+     *
+     * @param string Session ID
+     */
+    public function destroy($key)
+    {
+        return $this->memcache ? $this->mc_destroy($key) : $this->db_destroy($key);
     }
-    else { // else read data again from DB
-      $oldvars = $this->db_read($key);
+
+
+    /**
+     * Read session data from database
+     *
+     * @param string Session ID
+     *
+     * @return string Session vars
+     */
+    public function db_read($key)
+    {
+        $sql_result = $this->db->query(
+            "SELECT vars, ip, changed FROM ".$this->db->table_name('session')
+            ." WHERE sess_id = ?", $key);
+
+        if ($sql_result && ($sql_arr = $this->db->fetch_assoc($sql_result))) {
+            $this->changed = strtotime($sql_arr['changed']);
+            $this->ip      = $sql_arr['ip'];
+            $this->vars    = base64_decode($sql_arr['vars']);
+            $this->key     = $key;
+
+            return !empty($this->vars) ? (string) $this->vars : '';
+        }
+
+        return null;
     }
 
-    if ($oldvars !== null) {
-      $newvars = $this->_fixvars($vars, $oldvars);
 
-      if ($newvars !== $oldvars) {
+    /**
+     * Save session data.
+     * handler for session_read()
+     *
+     * @param string Session ID
+     * @param string Serialized session vars
+     *
+     * @return boolean True on success
+     */
+    public function db_write($key, $vars)
+    {
+        $ts  = microtime(true);
+        $now = $this->db->fromunixtime((int)$ts);
+
+        // no session row in DB (db_read() returns false)
+        if (!$this->key) {
+            $oldvars = null;
+        }
+        // use internal data from read() for fast requests (up to 0.5 sec.)
+        else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5)) {
+            $oldvars = $this->vars;
+        }
+        else { // else read data again from DB
+            $oldvars = $this->db_read($key);
+        }
+
+        if ($oldvars !== null) {
+            $newvars = $this->_fixvars($vars, $oldvars);
+
+            if ($newvars !== $oldvars) {
+                $this->db->query(
+                    sprintf("UPDATE %s SET vars=?, changed=%s WHERE sess_id=?",
+                        $this->db->table_name('session'), $now),
+                        base64_encode($newvars), $key);
+            }
+            else if ($ts - $this->changed > $this->lifetime / 2) {
+                $this->db->query("UPDATE ".$this->db->table_name('session')
+                    ." SET changed=$now WHERE sess_id=?", $key);
+            }
+        }
+        else {
+            $this->db->query(
+                sprintf("INSERT INTO %s (sess_id, vars, ip, created, changed) ".
+                    "VALUES (?, ?, ?, %s, %s)",
+                    $this->db->table_name('session'), $now, $now),
+                    $key, base64_encode($vars), (string)$this->ip);
+        }
+
+        return true;
+    }
+
+
+    /**
+     * Merge vars with old vars and apply unsets
+     */
+    private function _fixvars($vars, $oldvars)
+    {
+        if ($oldvars !== null) {
+            $a_oldvars = $this->unserialize($oldvars);
+            if (is_array($a_oldvars)) {
+                // remove unset keys on oldvars
+                foreach ((array)$this->unsets as $var) {
+                    if (isset($a_oldvars[$var])) {
+                        unset($a_oldvars[$var]);
+                    }
+                    else {
+                        $path = explode('.', $var);
+                        $k = array_pop($path);
+                        $node = &$this->get_node($path, $a_oldvars);
+                        unset($node[$k]);
+                    }
+                }
+
+                $newvars = $this->serialize(array_merge(
+                    (array)$a_oldvars, (array)$this->unserialize($vars)));
+            }
+            else {
+                $newvars = $vars;
+            }
+        }
+
+        $this->unsets = array();
+        return $newvars;
+    }
+
+
+    /**
+     * Handler for session_destroy()
+     *
+     * @param string Session ID
+     *
+     * @return boolean True on success
+     */
+    public function db_destroy($key)
+    {
+        if ($key) {
+            $this->db->query(sprintf("DELETE FROM %s WHERE sess_id = ?",
+                $this->db->table_name('session')), $key);
+        }
+
+        return true;
+    }
+
+
+    /**
+     * Garbage collecting function
+     *
+     * @param string Session lifetime in seconds
+     * @return boolean True on success
+     */
+    public function db_gc($maxlifetime)
+    {
+        // just delete all expired sessions
         $this->db->query(
-          sprintf("UPDATE %s SET vars=?, changed=%s WHERE sess_id=?",
-            $this->db->table_name('session'), $now),
-          base64_encode($newvars), $key);
-      }
-      else if ($ts - $this->changed > $this->lifetime / 2) {
-        $this->db->query("UPDATE ".$this->db->table_name('session')." SET changed=$now WHERE sess_id=?", $key);
-      }
+            sprintf("DELETE FROM %s WHERE changed < %s",
+                $this->db->table_name('session'), $this->db->fromunixtime(time() - $maxlifetime)));
+
+        $this->gc();
+
+        return true;
+    }
+
+
+    /**
+     * Read session data from memcache
+     *
+     * @param string Session ID
+     * @return string Session vars
+     */
+    public function mc_read($key)
+    {
+        if ($value = $this->memcache->get($key)) {
+            $arr = unserialize($value);
+            $this->changed = $arr['changed'];
+            $this->ip      = $arr['ip'];
+            $this->vars    = $arr['vars'];
+            $this->key     = $key;
+
+            return !empty($this->vars) ? (string) $this->vars : '';
+        }
+
+        return null;
+    }
+
+
+    /**
+     * Save session data.
+     * handler for session_read()
+     *
+     * @param string Session ID
+     * @param string Serialized session vars
+     *
+     * @return boolean True on success
+     */
+    public function mc_write($key, $vars)
+    {
+        $ts = microtime(true);
+
+        // no session data in cache (mc_read() returns false)
+        if (!$this->key)
+            $oldvars = null;
+        // use internal data for fast requests (up to 0.5 sec.)
+        else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5))
+            $oldvars = $this->vars;
+        else // else read data again
+            $oldvars = $this->mc_read($key);
+
+        $newvars = $oldvars !== null ? $this->_fixvars($vars, $oldvars) : $vars;
+
+        if ($newvars !== $oldvars || $ts - $this->changed > $this->lifetime / 2) {
+            return $this->memcache->set($key, serialize(array('changed' => time(), 'ip' => $this->ip, 'vars' => $newvars)),
+                MEMCACHE_COMPRESSED, $this->lifetime);
+        }
+
+        return true;
+    }
+
+
+    /**
+     * Handler for session_destroy() with memcache backend
+     *
+     * @param string Session ID
+     *
+     * @return boolean True on success
+     */
+    public function mc_destroy($key)
+    {
+        if ($key) {
+            // #1488592: use 2nd argument
+            $this->memcache->delete($key, 0);
+        }
+
+        return true;
+    }
+
+
+    /**
+     * Execute registered garbage collector routines
+     */
+    public function gc()
+    {
+        foreach ($this->gc_handlers as $fct) {
+            call_user_func($fct);
+        }
+    }
+
+
+    /**
+     * Register additional garbage collector functions
+     *
+     * @param mixed Callback function
+     */
+    public function register_gc_handler($func)
+    {
+        foreach ($this->gc_handlers as $handler) {
+            if ($handler == $func) {
+                return;
+            }
+        }
+
+        $this->gc_handlers[] = $func;
     }
-    else {
-      $this->db->query(
-        sprintf("INSERT INTO %s (sess_id, vars, ip, created, changed) ".
-          "VALUES (?, ?, ?, %s, %s)",
-          $this->db->table_name('session'), $now, $now),
-        $key, base64_encode($vars), (string)$this->ip);
+
+
+    /**
+     * Generate and set new session id
+     *
+     * @param boolean $destroy If enabled the current session will be destroyed
+     */
+    public function regenerate_id($destroy=true)
+    {
+        session_regenerate_id($destroy);
+
+        $this->vars = null;
+        $this->key  = session_id();
+
+        return true;
     }
 
-    return true;
-  }
-
-
-  /**
-   * Merge vars with old vars and apply unsets
-   */
-  private function _fixvars($vars, $oldvars)
-  {
-    if ($oldvars !== null) {
-      $a_oldvars = $this->unserialize($oldvars);
-      if (is_array($a_oldvars)) {
-        foreach ((array)$this->unsets as $k)
-          unset($a_oldvars[$k]);
-
-        $newvars = $this->serialize(array_merge(
-          (array)$a_oldvars, (array)$this->unserialize($vars)));
-      }
-      else
-        $newvars = $vars;
+
+    /**
+     * Append the given value to the certain node in the session data array
+     *
+     * @param string Path denoting the session variable where to append the value
+     * @param string Key name under which to append the new value (use null for appending to an indexed list)
+     * @param mixed  Value to append to the session data array
+     */
+    public function append($path, $key, $value)
+    {
+        // re-read session data from DB because it might be outdated
+        if (!$this->reloaded && microtime(true) - $this->start > 0.5) {
+            $this->reload();
+            $this->reloaded = true;
+            $this->start = microtime(true);
+        }
+
+        $node = &$this->get_node(explode('.', $path), $_SESSION);
+
+        if ($key !== null) $node[$key] = $value;
+        else               $node[] = $value;
     }
 
-    $this->unsets = array();
-    return $newvars;
-  }
-
-
-  /**
-   * Handler for session_destroy()
-   *
-   * @param string Session ID
-   *
-   * @return boolean True on success
-   */
-  public function db_destroy($key)
-  {
-    if ($key) {
-      $this->db->query(sprintf("DELETE FROM %s WHERE sess_id = ?", $this->db->table_name('session')), $key);
+
+    /**
+     * Unset a session variable
+     *
+     * @param string Variable name (can be a path denoting a certain node in the session array, e.g. compose.attachments.5)
+     * @return boolean True on success
+     */
+    public function remove($var=null)
+    {
+        if (empty($var)) {
+            return $this->destroy(session_id());
+        }
+
+        $this->unsets[] = $var;
+
+        if (isset($_SESSION[$var])) {
+            unset($_SESSION[$var]);
+        }
+        else {
+            $path = explode('.', $var);
+            $key = array_pop($path);
+            $node = &$this->get_node($path, $_SESSION);
+            unset($node[$key]);
+        }
+
+        return true;
     }
 
-    return true;
-  }
-
-
-  /**
-   * Garbage collecting function
-   *
-   * @param string Session lifetime in seconds
-   * @return boolean True on success
-   */
-  public function db_gc($maxlifetime)
-  {
-    // just delete all expired sessions
-    $this->db->query(
-      sprintf("DELETE FROM %s WHERE changed < %s",
-        $this->db->table_name('session'), $this->db->fromunixtime(time() - $maxlifetime)));
-
-    $this->gc();
-
-    return true;
-  }
-
-
-  /**
-   * Read session data from memcache
-   *
-   * @param string Session ID
-   * @return string Session vars
-   */
-  public function mc_read($key)
-  {
-    if ($value = $this->memcache->get($key)) {
-      $arr = unserialize($value);
-      $this->changed = $arr['changed'];
-      $this->ip      = $arr['ip'];
-      $this->vars    = $arr['vars'];
-      $this->key     = $key;
-
-      return !empty($this->vars) ? (string) $this->vars : '';
+
+    /**
+     * Kill this session
+     */
+    public function kill()
+    {
+        $this->vars = null;
+        $this->ip = $_SERVER['REMOTE_ADDR']; // update IP (might have changed)
+        $this->destroy(session_id());
+        rcube_utils::setcookie($this->cookiename, '-del-', time() - 60);
     }
 
-    return null;
-  }
-
-
-  /**
-   * Save session data.
-   * handler for session_read()
-   *
-   * @param string Session ID
-   * @param string Serialized session vars
-   * @return boolean True on success
-   */
-  public function mc_write($key, $vars)
-  {
-    $ts = microtime(true);
-
-    // no session data in cache (mc_read() returns false)
-    if (!$this->key)
-      $oldvars = null;
-    // use internal data for fast requests (up to 0.5 sec.)
-    else if ($key == $this->key && (!$this->vars || $ts - $this->start < 0.5))
-      $oldvars = $this->vars;
-    else // else read data again
-      $oldvars = $this->mc_read($key);
-
-    $newvars = $oldvars !== null ? $this->_fixvars($vars, $oldvars) : $vars;
-
-    if ($newvars !== $oldvars || $ts - $this->changed > $this->lifetime / 2)
-      return $this->memcache->set($key, serialize(array('changed' => time(), 'ip' => $this->ip, 'vars' => $newvars)), MEMCACHE_COMPRESSED, $this->lifetime);
-
-    return true;
-  }
-
-
-  /**
-   * Handler for session_destroy() with memcache backend
-   *
-   * @param string Session ID
-   *
-   * @return boolean True on success
-   */
-  public function mc_destroy($key)
-  {
-    if ($key) {
-      // #1488592: use 2nd argument
-      $this->memcache->delete($key, 0);
+
+    /**
+     * Re-read session data from storage backend
+     */
+    public function reload()
+    {
+        if ($this->key && $this->memcache)
+            $data = $this->mc_read($this->key);
+        else if ($this->key)
+            $data = $this->db_read($this->key);
+
+        if ($data)
+            session_decode($data);
     }
 
-    return true;
-  }
+    /**
+     * Returns a reference to the node in data array referenced by the given path.
+     * e.g. ['compose','attachments'] will return $_SESSION['compose']['attachments']
+     */
+    private function &get_node($path, &$data_arr)
+    {
+        $node = &$data_arr;
+        if (!empty($path)) {
+            foreach ((array)$path as $key) {
+                if (!isset($node[$key]))
+                    $node[$key] = array();
+                $node = &$node[$key];
+            }
+        }
+
+        return $node;
+    }
 
+    /**
+     * Serialize session data
+     */
+    private function serialize($vars)
+    {
+        $data = '';
+        if (is_array($vars)) {
+            foreach ($vars as $var=>$value)
+                $data .= $var.'|'.serialize($value);
+        }
+        else {
+            $data = 'b:0;';
+        }
 
-  /**
-   * Execute registered garbage collector routines
-   */
-  public function gc()
-  {
-    foreach ($this->gc_handlers as $fct) {
-      call_user_func($fct);
+        return $data;
     }
-  }
-
-
-  /**
-   * Register additional garbage collector functions
-   *
-   * @param mixed Callback function
-   */
-  public function register_gc_handler($func)
-  {
-    foreach ($this->gc_handlers as $handler) {
-      if ($handler == $func) {
-        return;
-      }
+
+
+    /**
+     * Unserialize session data
+     * http://www.php.net/manual/en/function.session-decode.php#56106
+     */
+    private function unserialize($str)
+    {
+        $str    = (string)$str;
+        $endptr = strlen($str);
+        $p      = 0;
+
+        $serialized = '';
+        $items      = 0;
+        $level      = 0;
+
+        while ($p < $endptr) {
+            $q = $p;
+            while ($str[$q] != '|')
+                if (++$q >= $endptr)
+                    break 2;
+
+            if ($str[$p] == '!') {
+                $p++;
+                $has_value = false;
+            }
+            else {
+                $has_value = true;
+            }
+
+            $name = substr($str, $p, $q - $p);
+            $q++;
+
+            $serialized .= 's:' . strlen($name) . ':"' . $name . '";';
+
+            if ($has_value) {
+                for (;;) {
+                    $p = $q;
+                    switch (strtolower($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++;
+                        // increment pointer because of outer array
+                        $serialized .= 'R:' . ($id + 1) . ';';
+                        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;
+        }
+
+        return unserialize( 'a:' . $items . ':{' . $serialized . '}' );
     }
 
-    $this->gc_handlers[] = $func;
-  }
-
-
-  /**
-   * Generate and set new session id
-   *
-   * @param boolean $destroy If enabled the current session will be destroyed
-   */
-  public function regenerate_id($destroy=true)
-  {
-    session_regenerate_id($destroy);
-
-    $this->vars = null;
-    $this->key  = session_id();
-
-    return true;
-  }
-
-
-  /**
-   * Unset a session variable
-   *
-   * @param string Varibale name
-   * @return boolean True on success
-   */
-  public function remove($var=null)
-  {
-    if (empty($var))
-      return $this->destroy(session_id());
-
-    $this->unsets[] = $var;
-    unset($_SESSION[$var]);
-
-    return true;
-  }
-
-
-  /**
-   * Kill this session
-   */
-  public function kill()
-  {
-    $this->vars = null;
-    $this->ip = $_SERVER['REMOTE_ADDR']; // update IP (might have changed)
-    $this->destroy(session_id());
-    rcube_utils::setcookie($this->cookiename, '-del-', time() - 60);
-  }
-
-
-  /**
-   * Re-read session data from storage backend
-   */
-  public function reload()
-  {
-    if ($this->key && $this->memcache)
-      $data = $this->mc_read($this->key);
-    else if ($this->key)
-      $data = $this->db_read($this->key);
-
-    if ($data)
-     session_decode($data);
-  }
-
-
-  /**
-   * Serialize session data
-   */
-  private function serialize($vars)
-  {
-    $data = '';
-    if (is_array($vars))
-      foreach ($vars as $var=>$value)
-        $data .= $var.'|'.serialize($value);
-    else
-      $data = 'b:0;';
-    return $data;
-  }
-
-
-  /**
-   * Unserialize session data
-   * http://www.php.net/manual/en/function.session-decode.php#56106
-   */
-  private function unserialize($str)
-  {
-    $str = (string)$str;
-    $endptr = strlen($str);
-    $p = 0;
-
-    $serialized = '';
-    $items = 0;
-    $level = 0;
-
-    while ($p < $endptr) {
-      $q = $p;
-      while ($str[$q] != '|')
-        if (++$q >= $endptr) break 2;
-
-      if ($str[$p] == '!') {
-        $p++;
-        $has_value = false;
-      } else {
-        $has_value = true;
-      }
-
-      $name = substr($str, $p, $q - $p);
-      $q++;
-
-      $serialized .= 's:' . strlen($name) . ':"' . $name . '";';
-
-      if ($has_value) {
-        for (;;) {
-          $p = $q;
-          switch (strtolower($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 */
-              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;
-          }
+
+    /**
+     * Setter for session lifetime
+     */
+    public function set_lifetime($lifetime)
+    {
+        $this->lifetime = max(120, $lifetime);
+
+        // valid time range is now - 1/2 lifetime to now + 1/2 lifetime
+        $now = time();
+        $this->now = $now - ($now % ($this->lifetime / 2));
+    }
+
+
+    /**
+     * Getter for remote IP saved with this session
+     */
+    public function get_ip()
+    {
+        return $this->ip;
+    }
+
+
+    /**
+     * Setter for cookie encryption secret
+     */
+    function set_secret($secret)
+    {
+        $this->secret = $secret;
+    }
+
+
+    /**
+     * Enable/disable IP check
+     */
+    function set_ip_check($check)
+    {
+        $this->ip_check = $check;
+    }
+
+
+    /**
+     * Setter for the cookie name used for session cookie
+     */
+    function set_cookiename($cookiename)
+    {
+        if ($cookiename) {
+            $this->cookiename = $cookiename;
         }
-      } else {
-        $serialized .= 'N;';
-        $q += 2;
-      }
-      $items++;
-      $p = $q;
     }
 
-    return unserialize( 'a:' . $items . ':{' . $serialized . '}' );
-  }
-
-
-  /**
-   * Setter for session lifetime
-   */
-  public function set_lifetime($lifetime)
-  {
-      $this->lifetime = max(120, $lifetime);
-
-      // valid time range is now - 1/2 lifetime to now + 1/2 lifetime
-      $now = time();
-      $this->now = $now - ($now % ($this->lifetime / 2));
-  }
-
-
-  /**
-   * Getter for remote IP saved with this session
-   */
-  public function get_ip()
-  {
-    return $this->ip;
-  }
-
-
-  /**
-   * Setter for cookie encryption secret
-   */
-  function set_secret($secret)
-  {
-    $this->secret = $secret;
-  }
-
-
-  /**
-   * Enable/disable IP check
-   */
-  function set_ip_check($check)
-  {
-    $this->ip_check = $check;
-  }
-
-
-  /**
-   * Setter for the cookie name used for session cookie
-   */
-  function set_cookiename($cookiename)
-  {
-    if ($cookiename)
-      $this->cookiename = $cookiename;
-  }
-
-
-  /**
-   * Check session authentication cookie
-   *
-   * @return boolean True if valid, False if not
-   */
-  function check_auth()
-  {
-    $this->cookie = $_COOKIE[$this->cookiename];
-    $result = $this->ip_check ? $_SERVER['REMOTE_ADDR'] == $this->ip : true;
-
-    if (!$result)
-      $this->log("IP check failed for " . $this->key . "; expected " . $this->ip . "; got " . $_SERVER['REMOTE_ADDR']);
-
-    if ($result && $this->_mkcookie($this->now) != $this->cookie) {
-      $this->log("Session auth check failed for " . $this->key . "; timeslot = " . date('Y-m-d H:i:s', $this->now));
-      $result = false;
-
-      // Check if using id from a previous time slot
-      for ($i = 1; $i <= 2; $i++) {
-        $prev = $this->now - ($this->lifetime / 2) * $i;
-        if ($this->_mkcookie($prev) == $this->cookie) {
-          $this->log("Send new auth cookie for " . $this->key . ": " . $this->cookie);
-          $this->set_auth_cookie();
-          $result = true;
+
+    /**
+     * Check session authentication cookie
+     *
+     * @return boolean True if valid, False if not
+     */
+    function check_auth()
+    {
+        $this->cookie = $_COOKIE[$this->cookiename];
+        $result = $this->ip_check ? $_SERVER['REMOTE_ADDR'] == $this->ip : true;
+
+        if (!$result) {
+            $this->log("IP check failed for " . $this->key . "; expected " . $this->ip . "; got " . $_SERVER['REMOTE_ADDR']);
+        }
+
+        if ($result && $this->_mkcookie($this->now) != $this->cookie) {
+            $this->log("Session auth check failed for " . $this->key . "; timeslot = " . date('Y-m-d H:i:s', $this->now));
+            $result = false;
+
+            // Check if using id from a previous time slot
+            for ($i = 1; $i <= 2; $i++) {
+                $prev = $this->now - ($this->lifetime / 2) * $i;
+                if ($this->_mkcookie($prev) == $this->cookie) {
+                    $this->log("Send new auth cookie for " . $this->key . ": " . $this->cookie);
+                    $this->set_auth_cookie();
+                    $result = true;
+                }
+            }
         }
-      }
+
+        if (!$result) {
+            $this->log("Session authentication failed for " . $this->key
+                . "; invalid auth cookie sent; timeslot = " . date('Y-m-d H:i:s', $prev));
+        }
+
+        return $result;
     }
 
-    if (!$result)
-      $this->log("Session authentication failed for " . $this->key . "; invalid auth cookie sent; timeslot = " . date('Y-m-d H:i:s', $prev));
-
-    return $result;
-  }
-
-
-  /**
-   * Set session authentication cookie
-   */
-  function set_auth_cookie()
-  {
-    $this->cookie = $this->_mkcookie($this->now);
-    rcube_utils::setcookie($this->cookiename, $this->cookie, 0);
-    $_COOKIE[$this->cookiename] = $this->cookie;
-  }
-
-
-  /**
-   * Create session cookie from session data
-   *
-   * @param int Time slot to use
-   */
-  function _mkcookie($timeslot)
-  {
-    $auth_string = "$this->key,$this->secret,$timeslot";
-    return "S" . (function_exists('sha1') ? sha1($auth_string) : md5($auth_string));
-  }
-
-  /**
-   * Writes debug information to the log
-   */
-  function log($line)
-  {
-    if ($this->logging)
-      rcube::write_log('session', $line);
-  }
 
+    /**
+     * Set session authentication cookie
+     */
+    function set_auth_cookie()
+    {
+        $this->cookie = $this->_mkcookie($this->now);
+        rcube_utils::setcookie($this->cookiename, $this->cookie, 0);
+        $_COOKIE[$this->cookiename] = $this->cookie;
+    }
+
+
+    /**
+     * Create session cookie from session data
+     *
+     * @param int Time slot to use
+     */
+    function _mkcookie($timeslot)
+    {
+        $auth_string = "$this->key,$this->secret,$timeslot";
+        return "S" . (function_exists('sha1') ? sha1($auth_string) : md5($auth_string));
+    }
+
+    /**
+     * Writes debug information to the log
+     */
+    function log($line)
+    {
+        if ($this->logging) {
+            rcube::write_log('session', $line);
+        }
+    }
 }