374 lines
8.4 KiB
PHP
374 lines
8.4 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Captcha
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* @subpackage Adapter
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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/** Zend_Captcha_Base */
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require_once 'Zend/Captcha/Base.php';
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/**
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* Word-based captcha adapter
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*
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* Generates random word which user should recognise
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*
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* @category Zend
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* @package Zend_Captcha
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* @subpackage Adapter
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* @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: $
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*/
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abstract class Zend_Captcha_Word extends Zend_Captcha_Base
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{
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/**#@+
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* @var array Character sets
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*/
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static $V = array("a", "e", "i", "o", "u", "y");
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static $VN = array("a", "e", "i", "o", "u", "y","2","3","4","5","6","7","8","9");
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static $C = array("b","c","d","f","g","h","j","k","m","n","p","q","r","s","t","u","v","w","x","z");
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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");
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/**#@-*/
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/**
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* Random session ID
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*
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* @var string
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*/
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protected $_id;
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/**
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* Generated word
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*
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* @var string
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*/
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protected $_word;
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/**
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* Session
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*
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* @var Zend_Session_Namespace
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*/
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protected $_session;
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/**
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* Class name for sessions
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*
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* @var string
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*/
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protected $_sessionClass = 'Zend_Session_Namespace';
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/**
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* Should the numbers be used or only letters
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*
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* @var boolean
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*/
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protected $_useNumbers = true;
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/**
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* Should both cases be used or only lowercase
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*
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* @var boolean
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*/
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// protected $_useCase = false;
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/**
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* Session lifetime for the captcha data
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*
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* @var integer
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*/
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protected $_timeout = 300;
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/**#@+
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* Error codes
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* @const string
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*/
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const MISSING_VALUE = 'missingValue';
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const MISSING_ID = 'missingID';
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const BAD_CAPTCHA = 'badCaptcha';
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/**#@-*/
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/**
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* Error messages
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* @var array
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*/
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protected $_messageTemplates = array(
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self::MISSING_VALUE => 'Empty captcha value',
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self::MISSING_ID => 'Captcha ID field is missing',
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self::BAD_CAPTCHA => 'Captcha value is wrong',
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);
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/**
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* Length of the word to generate
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*
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* @var integer
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*/
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protected $_wordlen = 8;
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/**
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* Retrieve session class to utilize
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*
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* @return string
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*/
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public function getSessionClass()
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{
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return $this->_sessionClass;
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}
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/**
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* Set session class for persistence
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*
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* @param string $_sessionClass
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* @return Zend_Captcha_Word
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*/
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public function setSessionClass($_sessionClass)
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{
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$this->_sessionClass = $_sessionClass;
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return $this;
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}
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/**
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* Retrieve word length to use when genrating captcha
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*
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* @return integer
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*/
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public function getWordlen()
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{
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return $this->_wordlen;
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}
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/**
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* Set word length of captcha
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*
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* @param integer $wordlen
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* @return Zend_Captcha_Word
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*/
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public function setWordlen($wordlen)
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{
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$this->_wordlen = $wordlen;
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return $this;
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}
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/**
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* Retrieve captcha ID
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*
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* @return string
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*/
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public function getId ()
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{
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if (null === $this->_id) {
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$this->_setId($this->_generateRandomId());
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}
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return $this->_id;
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}
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/**
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* Set captcha identifier
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*
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* @param string $id
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* return Zend_Captcha_Word
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*/
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protected function _setId ($id)
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{
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$this->_id = $id;
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return $this;
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}
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/**
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* Set timeout for session token
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*
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* @param int $ttl
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* @return Zend_Captcha_Word
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*/
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public function setTimeout($ttl)
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{
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$this->_timeout = (int) $ttl;
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return $this;
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}
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/**
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* Get session token timeout
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*
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* @return int
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*/
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public function getTimeout()
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{
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return $this->_timeout;
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}
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/**
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* Get session object
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*
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* @return Zend_Session_Namespace
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*/
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public function getSession()
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{
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if (!isset($this->_session) || (null === $this->_session)) {
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$id = $this->getId();
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if (!class_exists($this->_sessionClass)) {
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require_once 'Zend/Loader.php';
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Zend_Loader::loadClass($this->_sessionClass);
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}
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$this->_session = new $this->_sessionClass('Zend_Form_Captcha_' . $id);
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$this->_session->setExpirationHops(1, null, true);
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$this->_session->setExpirationSeconds($this->getTimeout());
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}
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return $this->_session;
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}
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/**
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* Set session namespace object
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*
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* @param Zend_Session_Namespace $session
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* @return Zend_Captcha_Word
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*/
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public function setSession(Zend_Session_Namespace $session)
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{
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$this->_session = $session;
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return $this;
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}
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/**
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* Get captcha word
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*
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* @return string
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*/
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public function getWord()
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{
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if (empty($this->_word)) {
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$session = $this->getSession();
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$this->_word = $session->word;
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}
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return $this->_word;
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}
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/**
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* Set captcha word
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*
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* @param string $word
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* @return Zend_Captcha_Word
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*/
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protected function _setWord($word)
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{
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$session = $this->getSession();
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$session->word = $word;
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$this->_word = $word;
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return $this;
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}
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/**
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* Generate new random word
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*
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* @return string
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*/
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protected function _generateWord()
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{
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$word = '';
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$wordLen = $this->getWordLen();
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$vowels = $this->_useNumbers ? self::$VN : self::$V;
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$consonants = $this->_useNumbers ? self::$CN : self::$C;
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for ($i=0; $i < $wordLen; $i = $i + 2) {
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// generate word with mix of vowels and consonants
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$consonant = $consonants[array_rand($consonants)];
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$vowel = $vowels[array_rand($vowels)];
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$word .= $consonant . $vowel;
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}
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if (strlen($word) > $wordLen) {
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$word = substr($word, 0, $wordLen);
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}
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return $word;
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}
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/**
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* Generate new session ID and new word
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*
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* @return string session ID
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*/
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public function generate()
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{
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$this->_session = null;
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$id = $this->_generateRandomId();
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$this->_setId($id);
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$word = $this->_generateWord();
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$this->_setWord($word);
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return $id;
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}
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protected function _generateRandomId()
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{
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return md5(mt_rand(0, 1000) . microtime(true));
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}
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/**
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* Validate the word
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*
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* @see Zend_Validate_Interface::isValid()
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* @param mixed $value
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* @return boolean
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*/
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public function isValid($value, $context = null)
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{
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if (!is_array($value) && !is_array($context)) {
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$this->_error(self::MISSING_VALUE);
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return false;
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}
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if (!is_array($value) && is_array($context)) {
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$value = $context;
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}
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$name = $this->getName();
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if (isset($value[$name])) {
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$value = $value[$name];
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}
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if (!isset($value['input'])) {
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$this->_error(self::MISSING_VALUE);
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return false;
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}
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$input = strtolower($value['input']);
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$this->_setValue($input);
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if (!isset($value['id'])) {
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$this->_error(self::MISSING_ID);
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return false;
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}
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$this->_id = $value['id'];
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if ($input !== $this->getWord()) {
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$this->_error(self::BAD_CAPTCHA);
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return false;
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}
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return true;
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}
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/**
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* Get captcha decorator
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*
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* @return string
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*/
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public function getDecorator()
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{
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return "Captcha_Word";
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}
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}
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