More conventions than code added:
[shipsimu.git] / inc / classes / main / filter / verifier / class_UserNameVerifierFilter.php
1 <?php
2 /**
3  * A concrete filter for verfying 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 was
6  * not found.
7  *
8  * @author              Roland Haeder <webmaster@ship-simu.org>
9  * @version             0.0.0
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
13  *
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.
18  *
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.
23  *
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/>.
26  */
27 class UserNameVerifierFilter extends BaseFilter implements Filterable {
28         /**
29          * Protected constructor
30          *
31          * @return      void
32          */
33         protected function __construct () {
34                 // Call parent constructor
35                 parent::__construct(__CLASS__);
36
37                 // Set part description
38                 $this->setObjectDescription("A filter for username verification");
39
40                 // Create unique ID number
41                 $this->generateUniqueId();
42         }
43
44         /**
45          * Creates an instance of this filter class
46          *
47          * @return      $filterInstance         An instance of this filter class
48          */
49         public final static function createUserNameVerifierFilter () {
50                 // Get a new instance
51                 $filterInstance = new UserNameVerifierFilter();
52
53                 // Return the instance
54                 return $filterInstance;
55         }
56
57         /**
58          * Executes the filter with given request and response objects
59          *
60          * @param       $requestInstance        An instance of a class with an Requestable interface
61          * @param       $responseInstance       An instance of a class with an Responseable interface
62          * @return      void
63          */
64         public function execute (Requestable $requestInstance, Responseable $responseInstance) {
65                 // Get username from request
66                 $userName = $requestInstance->getRequestElement('username');
67
68                 // Is the username set?
69                 if (is_null($userName)) {
70                         // Not found in form so stop the filtering process
71                         $requestInstance->requestIsValid(false);
72
73                         // Add a message to the response
74                         $responseInstance->addFatalMessage('username_unset');
75
76                         // Abort here
77                         return false;
78                 } elseif (empty($userName)) {
79                         // Empty field!
80                         $requestInstance->requestIsValid(false);
81
82                         // Add a message to the response
83                         $responseInstance->addFatalMessage('username_empty');
84
85                         // Abort here
86                         return false;
87                 } elseif (!$this->ifUserNameIsTaken($userName)) {
88                         // Username is already taken
89                         $requestInstance->requestIsValid(false);
90
91                         // Add a message to the response
92                         $responseInstance->addFatalMessage('username_not_found');
93
94                         // Abort here
95                         return false;
96                 }
97         }
98
99         /**
100          * Check wether the username as already been taken
101          *
102          * @param       $userName               Username to check for existence
103          * @return      $alreadyTaken   Wether the username has been taken
104          */
105         private function ifUserNameIsTaken ($userName) {
106                 // Default is already taken
107                 $alreadyTaken = true;
108
109                 // Initialize instance
110                 $userInstance = null;
111
112                 // Get a registry instance
113                 $registry = Registry::getRegistry();
114
115                 // Is the user already there?
116                 if ($registry->instanceExists('user')) {
117                         // Use the instance for checking for the email
118                         $userInstance = $registry->getInstance('user');
119                         $userInstance->setUserName($userName);
120                 } else {
121                         // If this instance is created then the username *does* exist
122                         try {
123                                 // Get a new instance
124                                 $userInstance = call_user_func_array(array($this->getConfigInstance()->readConfig('user_class'), "createUserByUsername"), array($userName));
125
126                                 // Remember this user instance in our registry for later usage
127                                 $registry->addInstance('user', $userInstance);
128                         } catch (UsernameMissingException $e) {
129                                 // User was not found
130                         }
131                 }
132
133                 // Does the username exist?
134                 if ((is_null($userInstance)) || (!$userInstance->ifUsernameExists())) {
135                         // This username is still available
136                         $alreadyTaken = false;
137                 }
138
139                 // Return the result
140                 return $alreadyTaken;
141         }
142 }
143
144 // [EOF]
145 ?>