139      * @param string $user
143     private function validateUser($user)  argument
145         if(!$this->secure) return $user;
151         if ($ACT == 'login' && !$USERINFO && $user == $INPUT->str('u')) {
152             return $user;
163         if (!$user || ($user !== $_SERVER['REMOTE_USER'] && !$INFO['isadmin'])) {
167         return $user;
180     private function loadAttributes($namespace, $user)  argument
182         $key      = rawurlencode($namespace) . '.' . rawurlencode($user);
236     private function saveAttributes($namespace, $user, $data)  argument
238         $key = rawurlencode($namespace) . '.' . rawurlencode($user);
296      * @param null   $user
300     public function set($namespace, $attribute, $value, $user = null)  argument
306         $user = $this->validateUser($user);
307         if ($user === null) {
310         $lock= $namespace . '.' . $user;
313         $data = $this->loadAttributes($namespace, $user);
320             $result = $this->saveAttributes($namespace, $user, $data);
333      * @param string|null $user
337     public function enumerateAttributes($namespace, $user = null)  argument
343         $user = $this->validateUser($user);
344         if ($user === null) {
348         $lock = $namespace . '.' . $user;
351         $data = $this->loadAttributes($namespace, $user);
370      * @param string|null $user
374     public function exists($namespace, $attribute, $user = null)  argument
380         $user = $this->validateUser($user);
381         if ($user === null) {
385         $lock = $namespace . '.' . $user;
388         $data = $this->loadAttributes($namespace, $user);
406      * @param string|null $user
410     public function del($namespace, $attribute, $user = null)  argument
416         $user = $this->validateUser($user);
417         if ($user === null) {
421         $lock = $namespace . '.' . $user;
424         $data = $this->loadAttributes($namespace, $user);
430                 $result = $this->saveAttributes($namespace, $user, $data);
448      * @param string $user
452     public function purge($namespace, $user)  argument
458         if ($this->validateUser($user) === null) {
462         $lock = $namespace . '.' . $user;
465         $key = rawurlencode($namespace) . '.' . rawurlencode($user);
491      * @param string|null $user
495     public function get($namespace, $attribute, &$success = false, $user = null)  argument
505         $user = $this->validateUser($user);
506         if ($user === null) {
510         $lock = $namespace . '.' . $user;
513         $data = $this->loadAttributes($namespace, $user);