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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Service
  * @subpackage ReCaptcha
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 
 /** @see Zend_Service_ReCaptcha */
 // require_once 'Zend/Service/ReCaptcha.php';
 
 /**
  * Zend_Service_ReCaptcha_MailHide
  *
  * @category   Zend
  * @package    Zend_Service
  * @subpackage ReCaptcha
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 class Zend_Service_ReCaptcha_MailHide extends Zend_Service_ReCaptcha
 {
     /**#@+
      * Encryption constants
      */
     const ENCRYPTION_MODE = MCRYPT_MODE_CBC;
     const ENCRYPTION_CIPHER = MCRYPT_RIJNDAEL_128;
     const ENCRYPTION_BLOCK_SIZE = 16;
     const ENCRYPTION_IV = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
     /**#@-*/
 
     /**
      * Url to the mailhide server
      *
      * @var string
      */
     const MAILHIDE_SERVER = 'http://mailhide.recaptcha.net/d';
 
     /**
      * The email address to protect
      *
      * @var string
      */
     protected $_email = null;
 
     /**
      * @var Zend_Validate_Interface
      */
     protected $_emailValidator;
 
     /**
      * Binary representation of the private key
      *
      * @var string
      */
     protected $_privateKeyPacked = null;
 
     /**
      * The local part of the email
      *
      * @var string
      */
     protected $_emailLocalPart = null;
 
     /**
      * The domain part of the email
      *
      * @var string
      */
     protected $_emailDomainPart = null;
 
     /**
      * Local constructor
      *
      * @param string $publicKey
      * @param string $privateKey
      * @param string $email
      * @param array|Zend_Config $options
      */
     public function __construct($publicKey = null, $privateKey = null, $email = null, $options = null)
     {
         /* Require the mcrypt extension to be loaded */
         $this->_requireMcrypt();
 
         /* If options is a Zend_Config object we want to convert it to an array so we can merge it with the default options */
         if ($options instanceof Zend_Config) {
             $options = $options->toArray();
         }
 
         /* Merge if needed */
         if (is_array($options)) {
             $options = array_merge($this->getDefaultOptions(), $options);
         } else {
             $options = $this->getDefaultOptions();
         }
 
         parent::__construct($publicKey, $privateKey, null, $options);
 
         if ($email !== null) {
             $this->setEmail($email);
         }
     }
 
 
     /**
      * Get emailValidator
      *
      * @return Zend_Validate_Interface
      */
     public function getEmailValidator()
     {
         if (null === $this->_emailValidator) {
             // require_once 'Zend/Validate/EmailAddress.php';
             $this->setEmailValidator(new Zend_Validate_EmailAddress());
         }
         return $this->_emailValidator;
     }
 
     /**
      * Set email validator
      *
      * @param  Zend_Validate_Interface $validator
      * @return Zend_Service_ReCaptcha_MailHide
      */
     public function setEmailValidator(Zend_Validate_Interface $validator)
     {
         $this->_emailValidator = $validator;
         return $this;
     }
 
 
     /**
      * See if the mcrypt extension is available
      *
      * @throws Zend_Service_ReCaptcha_MailHide_Exception
      */
     protected function _requireMcrypt()
     {
         if (!extension_loaded('mcrypt')) {
             /** @see Zend_Service_ReCaptcha_MailHide_Exception */
             // require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
 
             throw new Zend_Service_ReCaptcha_MailHide_Exception('Use of the Zend_Service_ReCaptcha_MailHide component requires the mcrypt extension to be enabled in PHP');
         }
     }
 
     /**
      * Serialize as string
      *
      * When the instance is used as a string it will display the email address. Since we can't
      * throw exceptions within this method we will trigger a user warning instead.
      *
      * @return string
      */
     public function __toString()
     {
         try {
             $return = $this->getHtml();
         } catch (Exception $e) {
             $return = '';
             trigger_error($e->getMessage(), E_USER_WARNING);
         }
 
         return $return;
     }
 
     /**
      * Get the default set of parameters
      *
      * @return array
      */
     public function getDefaultOptions()
     {
         return array(
             'encoding'       => 'UTF-8',
             'linkTitle'      => 'Reveal this e-mail address',
             'linkHiddenText' => '...',
             'popupWidth'     => 500,
             'popupHeight'    => 300,
         );
     }
 
     /**
      * Override the setPrivateKey method
      *
      * Override the parent method to store a binary representation of the private key as well.
      *
      * @param string $privateKey
      * @return Zend_Service_ReCaptcha_MailHide
      */
     public function setPrivateKey($privateKey)
     {
         parent::setPrivateKey($privateKey);
 
         /* Pack the private key into a binary string */
         $this->_privateKeyPacked = pack('H*', $this->_privateKey);
 
         return $this;
     }
 
     /**
      * Set the email property
      *
      * This method will set the email property along with the local and domain parts
      *
      * @param string $email
      * @return Zend_Service_ReCaptcha_MailHide
      */
     public function setEmail($email)
     {
         $this->_email = $email;
 
         $validator = $this->getEmailValidator();
         if (!$validator->isValid($email)) {
             // require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
             throw new Zend_Service_ReCaptcha_MailHide_Exception('Invalid email address provided');
         }
 
         $emailParts = explode('@', $email, 2);
 
         /* Decide on how much of the local part we want to reveal */
         if (strlen($emailParts[0]) <= 4) {
             $emailParts[0] = substr($emailParts[0], 0, 1);
         } else if (strlen($emailParts[0]) <= 6) {
             $emailParts[0] = substr($emailParts[0], 0, 3);
         } else {
             $emailParts[0] = substr($emailParts[0], 0, 4);
         }
 
         $this->_emailLocalPart = $emailParts[0];
         $this->_emailDomainPart = $emailParts[1];
 
         return $this;
     }
 
     /**
      * Get the email property
      *
      * @return string
      */
     public function getEmail()
     {
         return $this->_email;
     }
 
     /**
      * Get the local part of the email address
      *
      * @return string
      */
     public function getEmailLocalPart()
     {
         return $this->_emailLocalPart;
     }
 
     /**
      * Get the domain part of the email address
      *
      * @return string
      */
     public function getEmailDomainPart()
     {
         return $this->_emailDomainPart;
     }
 
     /**
      * Get the HTML code needed for the mail hide
      *
      * @param string $email
      * @return string
      * @throws Zend_Service_ReCaptcha_MailHide_Exception
      */
     public function getHtml($email = null)
     {
         if ($email !== null) {
             $this->setEmail($email);
         } elseif (null === ($email = $this->getEmail())) {
             /** @see Zend_Service_ReCaptcha_MailHide_Exception */
             // require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
             throw new Zend_Service_ReCaptcha_MailHide_Exception('Missing email address');
         }
 
         if ($this->_publicKey === null) {
             /** @see Zend_Service_ReCaptcha_MailHide_Exception */
             // require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
             throw new Zend_Service_ReCaptcha_MailHide_Exception('Missing public key');
         }
 
         if ($this->_privateKey === null) {
             /** @see Zend_Service_ReCaptcha_MailHide_Exception */
             // require_once 'Zend/Service/ReCaptcha/MailHide/Exception.php';
             throw new Zend_Service_ReCaptcha_MailHide_Exception('Missing private key');
         }
 
         /* Generate the url */
         $url = $this->_getUrl();
 
         $enc = $this->getOption('encoding');
 
         /* Genrate the HTML used to represent the email address */
         $html = htmlentities($this->getEmailLocalPart(), ENT_COMPAT, $enc)
             . '<a href="'
                 . htmlentities($url, ENT_COMPAT, $enc)
                 . '" onclick="window.open(\''
                     . htmlentities($url, ENT_COMPAT, $enc)
                     . '\', \'\', \'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width='
                     . $this->_options['popupWidth']
                     . ',height='
                     . $this->_options['popupHeight']
                 . '\'); return false;" title="'
                 . $this->_options['linkTitle']
                 . '">' . $this->_options['linkHiddenText'] . '</a>@'
                 . htmlentities($this->getEmailDomainPart(), ENT_COMPAT, $enc);
 
         return $html;
     }
 
     /**
      * Get the url used on the "hidden" part of the email address
      *
      * @return string
      */
     protected function _getUrl()
     {
         /* Figure out how much we need to pad the email */
         $numPad = self::ENCRYPTION_BLOCK_SIZE - (strlen($this->_email) % self::ENCRYPTION_BLOCK_SIZE);
 
         /* Pad the email */
         $emailPadded = str_pad($this->_email, strlen($this->_email) + $numPad, chr($numPad));
 
         /* Encrypt the email */
         $emailEncrypted = mcrypt_encrypt(self::ENCRYPTION_CIPHER, $this->_privateKeyPacked, $emailPadded, self::ENCRYPTION_MODE, self::ENCRYPTION_IV);
 
         /* Return the url */
         return self::MAILHIDE_SERVER . '?k=' . $this->_publicKey . '&c=' . strtr(base64_encode($emailEncrypted), '+/', '-_');
     }
 }