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1 <?php
2 // Own namespace
3 namespace Org\Mxchange\CoreFramework\Filter\Captcha;
4
5 // Import framework stuff
6 use Org\Mxchange\CoreFramework\Bootstrap\FrameworkBootstrap;
7 use Org\Mxchange\CoreFramework\Factory\Object\ObjectFactory;
8 use Org\Mxchange\CoreFramework\Filter\BaseFilter;
9 use Org\Mxchange\CoreFramework\Filter\Filterable;
10 use Org\Mxchange\CoreFramework\Helper\Crypto\CryptoHelper;
11 use Org\Mxchange\CoreFramework\Request\Requestable;
12 use Org\Mxchange\CoreFramework\Response\Responseable;
13
14 /**
15  * A filter for checking if value "encrypt" is set and fine
16  *
17  * @author              Roland Haeder <webmaster@shipsimu.org>
18  * @version             0.0.0
19  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2023 Core Developer Team
20  * @license             GNU GPL 3.0 or any newer version
21  * @link                http://www.shipsimu.org
22  *
23  * This program is free software: you can redistribute it and/or modify
24  * it under the terms of the GNU General Public License as published by
25  * the Free Software Foundation, either version 3 of the License, or
26  * (at your option) any later version.
27  *
28  * This program is distributed in the hope that it will be useful,
29  * but WITHOUT ANY WARRANTY; without even the implied warranty of
30  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
31  * GNU General Public License for more details.
32  *
33  * You should have received a copy of the GNU General Public License
34  * along with this program. If not, see <http://www.gnu.org/licenses/>.
35  */
36 class CaptchaEncryptFilter extends BaseFilter implements Filterable {
37         /**
38          * Protected constructor
39          *
40          * @return      void
41          */
42         private function __construct () {
43                 // Call parent constructor
44                 parent::__construct(__CLASS__);
45         }
46
47         /**
48          * Creates an instance of this filter class
49          *
50          * @return      $filterInstance                 An instance of this filter class
51          */
52         public static final function createCaptchaEncryptFilter () {
53                 // Get a new instance
54                 $filterInstance = new CaptchaEncryptFilter();
55
56                 // Return the instance
57                 return $filterInstance;
58         }
59
60         /**
61          * Executes the filter with given request and response objects
62          *
63          * @param       $requestInstance        An instance of a class with an Requestable interface
64          * @param       $responseInstance       An instance of a class with an Responseable interface
65          * @return      void
66          * @throws      EncryptMissingException         If the "encrypt" value is not set
67          */
68         public function execute (Requestable $requestInstance, Responseable $responseInstance) {
69                 // Get "encrypt" string barely from the request
70                 $encryptRequest = $requestInstance->getRequestElement('encrypt');
71
72                 // Is it there?
73                 if (is_null($encryptRequest)) {
74                         // Not found, so request is invalid
75                         $requestInstance->setIsRequestValid(FALSE);
76
77                         // Throw exception
78                         throw new EncryptMissingException($this, CryptoHelper::EXCEPTION_ENCRYPT_MISSING);
79                 }
80
81                 // Decode it fully
82                 $encryptDecoded = base64_decode(str_replace(' ', '+', urldecode($encryptRequest)));
83
84                 // Get a crypto helper and decrypt the string
85                 $decryptedString = CryptoHelper::getSelfInstance()->decryptString($encryptDecoded);
86
87                 // Is it the expected length?
88                 if (strlen($decryptedString) != FrameworkBootstrap::getConfigurationInstance()->getConfigEntry('captcha_string_length')) {
89                         // Not found, so request is invalid
90                         $requestInstance->setIsRequestValid(FALSE);
91
92                         // Throw exception
93                         throw new EncryptInvalidLengthException($this, CryptoHelper::EXCEPTION_ENCRYPT_INVALID);
94                 }
95
96                 // Write it to the request
97                 $requestInstance->setRequestElement('decrypted', $decryptedString);
98         }
99
100 }