Beta - but working - code for a new and extensive Session Library.

[eluser]starbbs[/eluser]

Code:

function __sessionVarNames($name){
  if (is_string($name)){
   if (strpos($name, ".")){
    $names = explode(".", $name);
   }else{
    $names = array($name);
   }
   $expression = "\$_SESSION";

   foreach($names as $item){
    $expression .= is_numeric($item) ? "[$item]" : "['$item']";
   }
   return $expression;
  }
  $this->__setError(3, "$name is not a string");
  return false;
}

function checkSessionVar($name){
  $expression = "return isset(" . $this->__sessionVarNames($name) . ");";
  return eval($expression);
}

function returnSessionVars(){
  if (!empty($_SESSION)){
   $result = eval("return \$_SESSION;");
   return $result;
  }
  $this->__setError(2, "No Session vars set");
  return false;
}

function destroyInvalid(){
  $sessionpath = session_save_path();
  $cookiename = $this->CI->config->item('sess_cookie_name');
  if (empty($sessionpath)){
   $sessionpath = "/tmp";
  }

  if (isset($_COOKIE[session_name()])){
   setcookie($cookiename, '', time() - 42000, $this->path);
  }
  $file = $sessionpath . '/' . "sess_" . session_id();
  @session_destroy();
  @unlink ($file);
  $this->__construct();
  $this->renew();
}

function getError($errorNumber){
  if (!is_array($this->error) || !array_key_exists($errorNumber, $this->error)){
   return false;
  }else{
   return $this->error[$errorNumber];
  }
}

function getLastError(){
  if ($this->lastError){
   return $this->getError($this->lastError);
  }else{
   return false;
  }
}

function __setError($errorNumber, $errorMessage){
  if ($this->error === false){
   $this->error = array();
  }
  $this->error[$errorNumber] = $errorMessage;
  $this->lastError = $errorNumber;
}

function __checkValid(){
  if ($this->readSessionVar("Config")){
   if ($this->userAgent == $this->readSessionVar("Config.userAgent") && $this->time <= $this->readSessionVar("Config.time")){
    $this->writeSessionVar("Config.time", $this->sessionTime);
    $this->valid = true;
   }else{
    $this->valid = false;
    $this->__setError(1, "Session Highjacking Attempted !!!");
    $this->destroyInvalid();
   }
  }else{
   srand ((double)microtime() * 1000000);
   $this->writeSessionVar('Config.rand', rand());
   $this->writeSessionVar("Config.time", $this->sessionTime);
   $this->writeSessionVar("Config.userAgent", $this->userAgent);
   $this->writeSessionVar("Config.ip_address", $this->ip_address);
   $this->writeSessionVar("schoolnaam", 'test naampje');
   $this->valid = true;

   $this->userdata = array('session_id' => md5(uniqid(session_id(), true)),
    'ip_address' => $this->CI->input->ip_address(),
    'user_agent' => substr($this->CI->input->user_agent(), 0, 50),
    'last_activity' => $this->now);

   $this->CI->db->query($this->CI->db->insert_string('ci_sessions', $this->userdata));

   $this->userdata['last_visit'] = 0;
   $this->__setError(1, "Session is valid");
  }
}

function __open(){
  return true;
}

function __close(){
  return true;
}

/**
  * Get the number of online users
  *
  * @return integer number of users currently online
  */
function get_all_users_online(){
  // counts the rows from the database
  $result = mysql_fetch_assoc(mysql_query("SELECT COUNT(session_id) as count FROM ci_sessions"));
  // return the number of found rows
  return $result["count"];
}

/**
  * Custom gc() function (garbage collector)
  *
  * @access private
  */
function __gc(){
  srand(time());
  if ((rand() % 100) < get_cfg_var('session.gc_probability')){
   $expire = $this->now - $this->sessionlength;

   $this->CI->db->where("last_activity < {$expire}");
   $this->CI->db->delete($this->session_table);

   log_message('debug', 'Session garbage collection performed.');
  }

  $expiry_time = time() - $this->sessionTime;
  log_message('debug', "SESSION DB -> The garbage collector was launched $expiry_time");
  $CI = & get_instance();
  // it deletes expired sessions from database
  $CI->db->query("DELETE FROM ci_sessions WHERE expires <= $expiry_time");
}

function __read ($id){
  $allData = array();
  $hasData = false;
  $result = false;
  log_message('debug', "Trying to read $id from SESSION DB");
  $this->CI->db->select('val');
  $this->CI->db->from($this->tablename);
  $this->CI->db->where('id', $id);
  $result = $this->CI->db->get($this->tablename);
  $frecords = $result->num_rows();
  if($frecords > 1){
   $hasData = ($frecords > 1) ? true : false;
   $allData[] = $result->result_array();
   log_message('debug', "Succesfully found $frecords in the SESSION db for $id");
  }
  if ($hasData){
   log_message('debug', "It seems that 'hasData' var was set to true because it found records in the session db");
   return $allData[$id];
  }else{
   log_message('debug', "No data has been found in de SESSION db for $id");
   return '';
  }
}

// continue next page