3 * A concrete filter for validating the username. This filter may intercept the
4 * filter chain if no username is given or if the supplied username has an
5 * invalid form. It could also intercept the filter chain if the username is
8 * @author Roland Haeder <webmaster@ship-simu.org>
10 * @copyright Copyright(c) 2007, 2008 Roland Haeder, this is free software
11 * @license GNU GPL 3.0 or any newer version
12 * @link http://www.ship-simu.org
14 * This program is free software: you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation, either version 3 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program. If not, see <http://www.gnu.org/licenses/>.
27 class UserNameValidatorFilter extends BaseFrameworkSystem implements Filterable {
29 * Protected constructor
33 protected function __construct () {
34 // Call parent constructor
35 parent::__construct(__CLASS__);
37 // Set part description
38 $this->setObjectDescription("A filter for username validation");
40 // Create unique ID number
41 $this->generateUniqueId();
44 $this->removeNumberFormaters();
45 $this->removeSystemArray();
49 * Creates an instance of this filter class
51 * @return $filterInstance An instance of this filter class
53 public final static function createUserNameValidatorFilter () {
55 $filterInstance = new UserNameValidatorFilter();
57 // Return the instance
58 return $filterInstance;
62 * Executes the filter with given request and response objects
64 * @param $requestInstance An instance of a class with an Requestable interface
65 * @param $responseInstance An instance of a class with an Responseable interface
68 public function execute (Requestable $requestInstance, Responseable $responseInstance) {
69 // Get username from request
70 $userName = $requestInstance->getRequestElement('username');
72 // Is the username set?
73 if (is_null($userName)) {
74 // Not found in form so stop the filtering process
75 $requestInstance->requestIsValid(false);
77 // Add a message to the response
78 $responseInstance->addFatalMessage('username_unset');
82 } elseif (empty($userName)) {
84 $requestInstance->requestIsValid(false);
86 // Add a message to the response
87 $responseInstance->addFatalMessage('username_empty');
91 } elseif ($this->ifUserNameIsTaken($userName)) {
92 // Username is already taken
93 $requestInstance->requestIsValid(false);
95 // Add a message to the response
96 $responseInstance->addFatalMessage('username_taken');
104 * Check wether the username as already been taken
106 * @param $userName Username to check for existence
107 * @return $alreadyTaken Wether the username has been taken
109 private function ifUserNameIsTaken ($userName) {
110 // Default is already taken
111 $alreadyTaken = true;
113 // Initialize instance
114 $userInstance = null;
116 // Get a registry instance
117 $registry = Registry::getRegistry();
119 // Is the user already there?
120 if ($registry->instanceExists('user')) {
121 // Use the instance for checking for the email
122 $userInstance = $registry->getInstance('user');
123 $userInstance->setUserName($userName);
125 // If this instance is created then the username *does* exist
127 // Get a new instance
128 $userInstance = call_user_func_array(array($this->getConfigInstance()->readConfig('user_class'), "createUserByUsername"), array($userName));
130 // Remember this user instance in our registry for later usage
131 $registry->addInstance('user', $userInstance);
132 } catch (UsernameMissingException $e) {
133 // User was not found
137 // Does the username exist?
138 if ((is_null($userInstance)) || (!$userInstance->ifUsernameExists())) {
139 // This username is still available
140 $alreadyTaken = false;
144 return $alreadyTaken;