/library/Zend/Captcha/Word.php
PHP | 356 lines | 146 code | 35 blank | 175 comment | 10 complexity | 9862fa23faeb3738a1282ac98a97e00f MD5 | raw file
Possible License(s): BSD-3-Clause, LGPL-2.1
- <?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) 2005-2008 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) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: $
- */
- 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();
- $this->_session = new $this->_sessionClass('Zend_Form_Captcha_' . $id);
- $this->_session->setExpirationHops(1);
- $this->_session->setExpirationSeconds($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)
- {
- $name = $this->getName();
- if (!isset($context[$name]['input'])) {
- $this->_error(self::MISSING_VALUE);
- return false;
- }
- $value = strtolower($context[$name]['input']);
- $this->_setValue($value);
- if (!isset($context[$name]['id'])) {
- $this->_error(self::MISSING_ID);
- return false;
- }
-
- $this->_id = $context[$name]['id'];
- if ($value != $this->getWord()) {
- $this->_error(self::BAD_CAPTCHA);
- return false;
- }
-
- return true;
- }
- /**
- * Get captcha decorator
- *
- * @return string
- */
- public function getDecorator()
- {
- return "Captcha_Word";
- }
- }