Code syncronized with shipsimu code base

[mailer.git] / inc / classes / main / filter / verifier / class_UserNameVerifierFilter.php

diff --git a/inc/classes/main/filter/verifier/class_UserNameVerifierFilter.php b/inc/classes/main/filter/verifier/class_UserNameVerifierFilter.php
new file mode 100644 (file)
index 0000000..7d0bde9
--- /dev/null
+++ b/inc/classes/main/filter/verifier/class_UserNameVerifierFilter.php
@@ -0,0 +1,139 @@
+<?php
+/**
+ * A concrete filter for verfying the username. This filter may intercept the
+ * filter chain if no username is given or if the supplied username has an
+ * invalid form. It could also intercept the filter chain if the username was
+ * not found.
+ *
+ * @author             Roland Haeder <webmaster@ship-simu.org>
+ * @version            0.0.0
+ * @copyright  Copyright (c) 2007, 2008 Roland Haeder, this is free software
+ * @license            GNU GPL 3.0 or any newer version
+ * @link               http://www.ship-simu.org
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+class UserNameVerifierFilter extends BaseFilter implements Filterable {
+       /**
+        * Protected constructor
+        *
+        * @return      void
+        */
+       protected function __construct () {
+               // Call parent constructor
+               parent::__construct(__CLASS__);
+       }
+
+       /**
+        * Creates an instance of this filter class
+        *
+        * @return      $filterInstance         An instance of this filter class
+        */
+       public final static function createUserNameVerifierFilter () {
+               // Get a new instance
+               $filterInstance = new UserNameVerifierFilter();
+
+               // Return the instance
+               return $filterInstance;
+       }
+
+       /**
+        * Executes the filter with given request and response objects
+        *
+        * @param       $requestInstance        An instance of a class with an Requestable interface
+        * @param       $responseInstance       An instance of a class with an Responseable interface
+        * @return      void
+        */
+       public function execute (Requestable $requestInstance, Responseable $responseInstance) {
+               // Get username from request
+               $userName = $requestInstance->getRequestElement('username');
+
+               // Is the username set?
+               if (is_null($userName)) {
+                       // Not found in form so stop the filtering process
+                       $requestInstance->requestIsValid(false);
+
+                       // Add a message to the response
+                       $responseInstance->addFatalMessage('username_unset');
+
+                       // Abort here
+                       return false;
+               } elseif (empty($userName)) {
+                       // Empty field!
+                       $requestInstance->requestIsValid(false);
+
+                       // Add a message to the response
+                       $responseInstance->addFatalMessage('username_empty');
+
+                       // Abort here
+                       return false;
+               } elseif (!$this->ifUserNameIsTaken($userName)) {
+                       // Username is already taken
+                       $requestInstance->requestIsValid(false);
+
+                       // Add a message to the response
+                       $responseInstance->addFatalMessage('username_not_found');
+
+                       // Abort here
+                       return false;
+               }
+       }
+
+       /**
+        * Check wether the username as already been taken
+        *
+        * @param       $userName               Username to check for existence
+        * @return      $alreadyTaken   Wether the username has been taken
+        */
+       private function ifUserNameIsTaken ($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');
+                       $userInstance->setUserName($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('user_class'), 'createMemberByUsername'), 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())) {
+                       // This username is still available
+                       $alreadyTaken = false;
+               } // END - if
+
+               // Return the result
+               return $alreadyTaken;
+       }
+}
+
+// [EOF]
+?>