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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_Captcha
* @subpackage Adapter
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
/** Zend_Captcha_Base */
require_once 'Zend/Captcha/Base.php';
/**
* Word-based captcha adapter
*
* Generates random word which user should recognise
*
* @category Zend
* @package Zend_Captcha
* @subpackage Adapter
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Word.php 16971 2009-07-22 18:05:45Z mikaelkael $
*/
abstract class Zend_Captcha_Word extends Zend_Captcha_Base
{
/**#@+
* @var array Character sets
*/
static $V = array("a", "e", "i", "o", "u", "y");
static $VN = array("a", "e", "i", "o", "u", "y","2","3","4","5","6","7","8","9");
static $C = array("b","c","d","f","g","h","j","k","m","n","p","q","r","s","t","u","v","w","x","z");
static $CN = array("b","c","d","f","g","h","j","k","m","n","p","q","r","s","t","u","v","w","x","z","2","3","4","5","6","7","8","9");
/**#@-*/
/**
* Random session ID
*
* @var string
*/
protected $_id;
/**
* Generated word
*
* @var string
*/
protected $_word;
/**
* Session
*
* @var Zend_Session_Namespace
*/
protected $_session;
/**
* Class name for sessions
*
* @var string
*/
protected $_sessionClass = 'Zend_Session_Namespace';
/**
* Should the numbers be used or only letters
*
* @var boolean
*/
protected $_useNumbers = true;
/**
* Should both cases be used or only lowercase
*
* @var boolean
*/
// protected $_useCase = false;
/**
* Session lifetime for the captcha data
*
* @var integer
*/
protected $_timeout = 300;
/**#@+
* Error codes
* @const string
*/
const MISSING_VALUE = 'missingValue';
const MISSING_ID = 'missingID';
const BAD_CAPTCHA = 'badCaptcha';
/**#@-*/
/**
* Error messages
* @var array
*/
protected $_messageTemplates = array(
self::MISSING_VALUE => 'Empty captcha value',
self::MISSING_ID => 'Captcha ID field is missing',
self::BAD_CAPTCHA => 'Captcha value is wrong',
);
/**
* Length of the word to generate
*
* @var integer
*/
protected $_wordlen = 8;
/**
* Retrieve session class to utilize
*
* @return string
*/
public function getSessionClass()
{
return $this->_sessionClass;
}
/**
* Set session class for persistence
*
* @param string $_sessionClass
* @return Zend_Captcha_Word
*/
public function setSessionClass($_sessionClass)
{
$this->_sessionClass = $_sessionClass;
return $this;
}
/**
* Retrieve word length to use when genrating captcha
*
* @return integer
*/
public function getWordlen()
{
return $this->_wordlen;
}
/**
* Set word length of captcha
*
* @param integer $wordlen
* @return Zend_Captcha_Word
*/
public function setWordlen($wordlen)
{
$this->_wordlen = $wordlen;
return $this;
}
/**
* Retrieve captcha ID
*
* @return string
*/
public function getId ()
{
if (null === $this->_id) {
$this->_setId($this->_generateRandomId());
}
return $this->_id;
}
/**
* Set captcha identifier
*
* @param string $id
* return Zend_Captcha_Word
*/
protected function _setId ($id)
{
$this->_id = $id;
return $this;
}
/**
* Set timeout for session token
*
* @param int $ttl
* @return Zend_Captcha_Word
*/
public function setTimeout($ttl)
{
$this->_timeout = (int) $ttl;
return $this;
}
/**
* Get session token timeout
*
* @return int
*/
public function getTimeout()
{
return $this->_timeout;
}
/**
* Get session object
*
* @return Zend_Session_Namespace
*/
public function getSession()
{
if (!isset($this->_session) || (null === $this->_session)) {
$id = $this->getId();
if (!class_exists($this->_sessionClass)) {
require_once 'Zend/Loader.php';
Zend_Loader::loadClass($this->_sessionClass);
}
$this->_session = new $this->_sessionClass('Zend_Form_Captcha_' . $id);
$this->_session->setExpirationHops(1, null, true);
$this->_session->setExpirationSeconds($this->getTimeout());
}
return $this->_session;
}
/**
* Set session namespace object
*
* @param Zend_Session_Namespace $session
* @return Zend_Captcha_Word
*/
public function setSession(Zend_Session_Namespace $session)
{
$this->_session = $session;
return $this;
}
/**
* Get captcha word
*
* @return string
*/
public function getWord()
{
if (empty($this->_word)) {
$session = $this->getSession();
$this->_word = $session->word;
}
return $this->_word;
}
/**
* Set captcha word
*
* @param string $word
* @return Zend_Captcha_Word
*/
protected function _setWord($word)
{
$session = $this->getSession();
$session->word = $word;
$this->_word = $word;
return $this;
}
/**
* Generate new random word
*
* @return string
*/
protected function _generateWord()
{
$word = '';
$wordLen = $this->getWordLen();
$vowels = $this->_useNumbers ? self::$VN : self::$V;
$consonants = $this->_useNumbers ? self::$CN : self::$C;
for ($i=0; $i < $wordLen; $i = $i + 2) {
// generate word with mix of vowels and consonants
$consonant = $consonants[array_rand($consonants)];
$vowel = $vowels[array_rand($vowels)];
$word .= $consonant . $vowel;
}
if (strlen($word) > $wordLen) {
$word = substr($word, 0, $wordLen);
}
return $word;
}
/**
* Generate new session ID and new word
*
* @return string session ID
*/
public function generate()
{
$this->_session = null;
$id = $this->_generateRandomId();
$this->_setId($id);
$word = $this->_generateWord();
$this->_setWord($word);
return $id;
}
protected function _generateRandomId()
{
return md5(mt_rand(0, 1000) . microtime(true));
}
/**
* Validate the word
*
* @see Zend_Validate_Interface::isValid()
* @param mixed $value
* @return boolean
*/
public function isValid($value, $context = null)
{
if (!is_array($value) && !is_array($context)) {
$this->_error(self::MISSING_VALUE);
return false;
}
if (!is_array($value) && is_array($context)) {
$value = $context;
}
$name = $this->getName();
if (isset($value[$name])) {
$value = $value[$name];
}
if (!isset($value['input'])) {
$this->_error(self::MISSING_VALUE);
return false;
}
$input = strtolower($value['input']);
$this->_setValue($input);
if (!isset($value['id'])) {
$this->_error(self::MISSING_ID);
return false;
}
$this->_id = $value['id'];
if ($input !== $this->getWord()) {
$this->_error(self::BAD_CAPTCHA);
return false;
}
return true;
}
/**
* Get captcha decorator
*
* @return string
*/
public function getDecorator()
{
return "Captcha_Word";
}
}
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