class_UserGuestVerifierFilter.php

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<?php
class UserGuestVerifierFilter extends BaseFilter implements Filterable {
        protected function __construct () {
                // Call parent constructor
                parent::__construct(__CLASS__);
        }

        public final static function createUserGuestVerifierFilter () {
                // Get a new instance
                $filterInstance = new UserGuestVerifierFilter();

                // Return the instance
                return $filterInstance;
        }

        public function execute (Requestable $requestInstance, Responseable $responseInstance) {
                // Get username from request
                $userName = $requestInstance->getRequestElement('user');

                // Is the username set?
                if (is_null($userName)) {
                        // Not found in form so stop the filtering process
                        $requestInstance->requestIsValid(false);

                        // Add a message to the response
                        $responseInstance->addFatalMessage('username_guest_unset');

                        // Abort here
                        return false;
                } elseif (empty($userName)) {
                        // Empty field!
                        $requestInstance->requestIsValid(false);

                        // Add a message to the response
                        $responseInstance->addFatalMessage('username_guest_empty');

                        // Abort here
                        return false;
                } elseif ($this->ifUserGuestIsTaken($userName) === false) {
                        // Username is already taken
                        $requestInstance->requestIsValid(false);

                        // Add a message to the response
                        $responseInstance->addFatalMessage('username_guest_not_found');

                        // Abort here
                        return false;
                }

                // Set the element for compatiblity reasons
                $requestInstance->setRequestElement('username', $userName);
        }

        private function ifUserGuestIsTaken ($userName) {
                // Default is already taken
                $alreadyTaken = true;

                // Initialize instance
                $userInstance = null;

                // Get a registry instance
                $registry = Registry::getRegistry();

                // Is the user already there?
                if ($registry->instanceExists('user')) {
                        // Use the instance for checking for the email
                        $userInstance = $registry->getInstance('user');
                        $userInstance->setUserGuest($userName);
                } else {
                        // If this instance is created then the username *does* exist
                        try {
                                // Get a new instance
                                $userInstance = call_user_func_array(array($this->getConfigInstance()->readConfig('guest_class'), 'createGuestByUsername'), array($userName));

                                // Remember this user instance in our registry for later usage
                                $registry->addInstance('user', $userInstance);
                        } catch (UsernameMissingException $e) {
                                // User was not found
                        }
                }

                // Does the username exist?
                if ((is_null($userInstance)) || ($userInstance->ifUsernameExists() === false)) {
                        // This username is still available
                        $alreadyTaken = false;
                }

                // Return the result
                return $alreadyTaken;
        }
}

// [EOF]
?>