3 * A filter for checking if the "encrypt" value is set and fine
5 * @author Roland Haeder <webmaster@ship-simu.org>
7 * @copyright Copyright (c) 2007, 2008 Roland Haeder, this is free software
8 * @license GNU GPL 3.0 or any newer version
9 * @link http://www.ship-simu.org
11 * This program is free software: you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation, either version 3 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 class CaptchaEncryptFilter extends BaseFrameworkSystem implements Filterable {
26 * Protected constructor
30 protected function __construct () {
31 // Call parent constructor
32 parent::__construct(__CLASS__);
34 // Set part description
35 $this->setObjectDescription("A filter for checking encryption data");
37 // Create unique ID number
38 $this->generateUniqueId();
42 * Creates an instance of this filter class
44 * @return $filterInstance An instance of this filter class
46 public final static function createCaptchaEncryptFilter () {
48 $filterInstance = new CaptchaEncryptFilter();
50 // Return the instance
51 return $filterInstance;
55 * Executes the filter with given request and response objects
57 * @param $requestInstance An instance of a class with an Requestable interface
58 * @param $responseInstance An instance of a class with an Responseable interface
60 * @throws EncryptMissingException If the "encrypt" value is not set
62 public function execute (Requestable $requestInstance, Responseable $responseInstance) {
63 // Get "encrypt" string barely from the request
64 $encryptRequest = $requestInstance->getRequestElement('encrypt');
67 if (is_null($encryptRequest)) {
68 // Not found, so request is invalid
69 $requestInstance->requestIsValid(false);
72 throw new EncryptMissingException($this, CryptoHelper::EXCEPTION_ENCRYPT_MISSING);
76 $encryptDecoded = base64_decode(str_replace(" ", "+", urldecode($encryptRequest)));
78 // Get a crypto helper and decrypt the string
79 $decryptedString = ObjectFactory::createObjectByConfiguredName('crypto_class')->decryptString($encryptDecoded);
81 // Is it the expected length?
82 if (strlen($decryptedString) != $this->getConfigInstance()->readConfig('captcha_string_length')) {
83 // Not found, so request is invalid
84 $requestInstance->requestIsValid(false);
87 throw new EncryptInvalidLengthException($this, CryptoHelper::EXCEPTION_ENCRYPT_INVALID);
90 // Write it to the request
91 $requestInstance->setRequestElement('decrypted', $decryptedString);