CRM/Utils/ReCAPTCHA.php

   1 <?php
   2 /*
   3  +--------------------------------------------------------------------+
   4  | CiviCRM version 4.7                                                |
   5  +--------------------------------------------------------------------+
   6  | Copyright CiviCRM LLC (c) 2004-2015                                |
   7  +--------------------------------------------------------------------+
   8  | This file is a part of CiviCRM.                                    |
   9  |                                                                    |
  10  | CiviCRM is free software; you can copy, modify, and distribute it  |
  11  | under the terms of the GNU Affero General Public License           |
  12  | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
  13  |                                                                    |
  14  | CiviCRM is distributed in the hope that it will be useful, but     |
  15  | WITHOUT ANY WARRANTY; without even the implied warranty of         |
  16  | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
  17  | See the GNU Affero General Public License for more details.        |
  18  |                                                                    |
  19  | You should have received a copy of the GNU Affero General Public   |
  20  | License and the CiviCRM Licensing Exception along                  |
  21  | with this program; if not, contact CiviCRM LLC                     |
  22  | at info[AT]civicrm[DOT]org. If you have questions about the        |
  23  | GNU Affero General Public License or the licensing of CiviCRM,     |
  24  | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
  25  +--------------------------------------------------------------------+
  26  */
  27
  28 /**
  29  *
  30  * @package CRM
  31  * @copyright CiviCRM LLC (c) 2004-2015
  32  */
  33 class CRM_Utils_ReCAPTCHA {
  34
  35   protected $_captcha = NULL;
  36
  37   protected $_name = NULL;
  38
  39   protected $_url = NULL;
  40
  41   protected $_phrase = NULL;
  42
  43   /**
  44    * We only need one instance of this object. So we use the singleton
  45    * pattern and cache the instance in this variable
  46    *
  47    * @var object
  48    */
  49   static private $_singleton = NULL;
  50
  51   /**
  52    * Singleton function used to manage this object.
  53    *
  54    *
  55    * @return object
  56    */
  57   public static function &singleton() {
  58     if (self::$_singleton === NULL) {
  59       self::$_singleton = new CRM_Utils_ReCAPTCHA();
  60     }
  61     return self::$_singleton;
  62   }
  63
  64   public function __construct() {
  65     // Empty function?
  66   }
  67
  68   /**
  69    * Add element to form.
  70    *
  71    * @param CRM_Core_Form $form
  72    */
  73   public static function add(&$form) {
  74     $error = NULL;
  75     $config = CRM_Core_Config::singleton();
  76     $useSSL = FALSE;
  77     if (!function_exists('recaptcha_get_html')) {
  78       require_once 'packages/recaptcha/recaptchalib.php';
  79     }
  80
  81     // See if we are using SSL
  82     if (CRM_Utils_System::isSSL()) {
  83       $useSSL = TRUE;
  84     }
  85     $html = recaptcha_get_html($config->recaptchaPublicKey, $error, $useSSL);
  86
  87     $form->assign('recaptchaHTML', $html);
  88     $form->assign('recaptchaOptions', $config->recaptchaOptions);
  89     $form->add(
  90       'text',
  91       'g-recaptcha-response',
  92       'reCaptcha',
  93       NULL,
  94       TRUE
  95     );
  96     $form->registerRule('recaptcha', 'callback', 'validate', 'CRM_Utils_ReCAPTCHA');
  97     if ($form->isSubmitted() && empty($form->_submitValues['g-recaptcha-response'])) {
  98       $form->setElementError(
  99         'g-recaptcha-response',
 100         ts('Input text must match the phrase in the image. Please review the image and re-enter matching text.')
 101       );
 102     }
 103   }
 104
 105 }