105 lines
2.9 KiB
PHP
105 lines
2.9 KiB
PHP
<?php
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/*
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* @copyright Copyright (C) 2005-2009 Keyboard Monkeys Ltd. http://www.kb-m.com
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* @license http://creativecommons.org/licenses/BSD/ BSD License
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* @author Keyboard Monkey Ltd
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* @since CommunityID 0.9
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* @package CommunityID
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* @packager Keyboard Monkeys
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*/
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/**
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* Same as Zend_Captcha_Image, but also readable by humans ;)
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*/
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class Monkeys_Captcha_Image extends Zend_Captcha_Image
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{
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/**#@+
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* All uppercase, and removed letters/numbers than can be mistaken for one another
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*/
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static $V = array("A", "E", "I", "U", "Y");
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static $VN = array("A", "E", "I", "U", "Y", "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","W","X");
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static $CN = array("B","C","D","F","G","H","J","K","M","N","P","Q","R","S","T","W","X","3","4","5","6","7","8","9");
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/**#@-*/
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/**#@+
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* Reduced these levels
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*/
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protected $_dotNoiseLevel = 25;
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protected $_lineNoiseLevel = 1;
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/**#@-*/
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/**
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* Gotta reproduce this function here 'cause PHP won't have late static binding till 5.3
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*/
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protected function _generateWord()
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{
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$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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* 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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$word = strtoupper($word);
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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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* Validate the word
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*
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* Overriden to handle on in uppercase for better readability
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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, $context = null)
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{
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$name = $this->getName();
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if (!isset($context[$name]['input'])) {
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$this->_error(self::MISSING_VALUE);
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return false;
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}
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$value = strtoupper($context[$name]['input']);
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$this->_setValue($value);
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if (!isset($context[$name]['id'])) {
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$this->_error(self::MISSING_ID);
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return false;
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}
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$this->_id = $context[$name]['id'];
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if ($value !== $this->getWord()) {
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$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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