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601 lines
14 KiB
PHP
601 lines
14 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) 2005-2009 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: Image.php 16971 2009-07-22 18:05:45Z mikaelkael $
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*/
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/** Zend_Captcha_Word */
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require_once 'Zend/Captcha/Word.php';
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/**
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* Image-based captcha element
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*
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* Generates image displaying random word
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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) 2005-2009 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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class Zend_Captcha_Image extends Zend_Captcha_Word
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{
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/**
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* Directory for generated images
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*
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* @var string
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*/
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protected $_imgDir = "./images/captcha/";
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/**
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* URL for accessing images
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*
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* @var string
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*/
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protected $_imgUrl = "/images/captcha/";
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/**
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* Image's alt tag content
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*
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* @var string
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*/
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protected $_imgAlt = "";
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/**
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* Image suffix (including dot)
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*
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* @var string
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*/
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protected $_suffix = ".png";
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/**
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* Image width
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*
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* @var int
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*/
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protected $_width = 200;
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/**
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* Image height
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*
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* @var int
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*/
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protected $_height = 50;
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/**
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* Font size
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*
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* @var int
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*/
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protected $_fsize = 24;
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/**
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* Image font file
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*
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* @var string
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*/
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protected $_font;
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/**
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* Image to use as starting point
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* Default is blank image. If ptovided, should be PNG image.
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*
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* @var string
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*/
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protected $_startImage;
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/**
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* How frequently to execute garbage collection
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*
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* @var int
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*/
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protected $_gcFreq = 10;
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/**
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* How long to keep generated images
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*
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* @var int
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*/
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protected $_expiration = 600;
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/**
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* Number of noise dots on image
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* Used twice - before and after transform
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*
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* @var int
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*/
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protected $_dotNoiseLevel = 100;
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/**
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* Number of noise lines on image
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* Used twice - before and after transform
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*
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* @var int
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*/
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protected $_lineNoiseLevel = 5;
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/**
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* @return string
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*/
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public function getImgAlt ()
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{
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return $this->_imgAlt;
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}
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/**
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* @return string
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*/
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public function getStartImage ()
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{
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return $this->_startImage;
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}
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/**
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* @return int
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*/
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public function getDotNoiseLevel ()
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{
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return $this->_dotNoiseLevel;
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}
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/**
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* @return int
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*/
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public function getLineNoiseLevel ()
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{
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return $this->_lineNoiseLevel;
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}
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/**
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* Get captcha expiration
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*
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* @return int
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*/
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public function getExpiration()
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{
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return $this->_expiration;
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}
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/**
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* Get garbage collection frequency
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*
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* @return int
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*/
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public function getGcFreq()
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{
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return $this->_gcFreq;
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}
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/**
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* Get font to use when generating captcha
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*
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* @return string
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*/
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public function getFont()
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{
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return $this->_font;
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}
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/**
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* Get font size
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*
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* @return int
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*/
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public function getFontSize()
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{
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return $this->_fsize;
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}
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/**
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* Get captcha image height
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*
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* @return int
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*/
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public function getHeight()
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{
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return $this->_height;
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}
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/**
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* Get captcha image directory
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*
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* @return string
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*/
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public function getImgDir()
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{
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return $this->_imgDir;
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}
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/**
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* Get captcha image base URL
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*
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* @return string
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*/
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public function getImgUrl()
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{
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return $this->_imgUrl;
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}
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/**
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* Get captcha image file suffix
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*
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* @return string
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*/
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public function getSuffix()
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{
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return $this->_suffix;
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}
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/**
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* Get captcha image width
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*
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* @return int
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*/
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public function getWidth()
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{
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return $this->_width;
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}
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/**
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* @param string $startImage
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*/
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public function setStartImage ($startImage)
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{
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$this->_startImage = $startImage;
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return $this;
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}
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/**
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* @param int $dotNoiseLevel
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*/
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public function setDotNoiseLevel ($dotNoiseLevel)
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{
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$this->_dotNoiseLevel = $dotNoiseLevel;
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return $this;
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}
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/**
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* @param int $lineNoiseLevel
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*/
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public function setLineNoiseLevel ($lineNoiseLevel)
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{
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$this->_lineNoiseLevel = $lineNoiseLevel;
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return $this;
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}
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/**
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* Set captcha expiration
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*
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* @param int $expiration
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* @return Zend_Captcha_Image
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*/
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public function setExpiration($expiration)
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{
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$this->_expiration = $expiration;
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return $this;
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}
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/**
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* Set garbage collection frequency
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*
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* @param int $gcFreq
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* @return Zend_Captcha_Image
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*/
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public function setGcFreq($gcFreq)
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{
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$this->_gcFreq = $gcFreq;
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return $this;
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}
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/**
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* Set captcha font
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*
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* @param string $font
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* @return Zend_Captcha_Image
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*/
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public function setFont($font)
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{
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$this->_font = $font;
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return $this;
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}
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/**
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* Set captcha font size
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*
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* @param int $fsize
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* @return Zend_Captcha_Image
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*/
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public function setFontSize($fsize)
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{
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$this->_fsize = $fsize;
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return $this;
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}
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/**
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* Set captcha image height
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*
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* @param int $height
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* @return Zend_Captcha_Image
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*/
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public function setHeight($height)
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{
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$this->_height = $height;
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return $this;
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}
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/**
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* Set captcha image storage directory
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*
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* @param string $imgDir
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* @return Zend_Captcha_Image
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*/
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public function setImgDir($imgDir)
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{
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$this->_imgDir = rtrim($imgDir, "/\\") . '/';
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return $this;
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}
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/**
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* Set captcha image base URL
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*
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* @param string $imgUrl
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* @return Zend_Captcha_Image
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*/
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public function setImgUrl($imgUrl)
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{
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$this->_imgUrl = rtrim($imgUrl, "/\\") . '/';
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return $this;
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}
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/**
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* @param string $imgAlt
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*/
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public function setImgAlt ($imgAlt)
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{
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$this->_imgAlt = $imgAlt;
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return $this;
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}
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/**
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* Set captch image filename suffix
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*
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* @param string $suffix
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* @return Zend_Captcha_Image
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*/
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public function setSuffix($suffix)
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{
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$this->_suffix = $suffix;
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return $this;
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}
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/**
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* Set captcha image width
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*
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* @param int $width
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* @return Zend_Captcha_Image
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*/
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public function setWidth($width)
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{
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$this->_width = $width;
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return $this;
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}
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/**
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* Generate random frequency
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*
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* @return float
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*/
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protected function _randomFreq()
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{
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return mt_rand(700000, 1000000) / 15000000;
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}
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/**
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* Generate random phase
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*
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* @return float
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*/
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protected function _randomPhase()
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{
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// random phase from 0 to pi
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return mt_rand(0, 3141592) / 1000000;
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}
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/**
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* Generate random character size
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*
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* @return int
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*/
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protected function _randomSize()
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{
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return mt_rand(300, 700) / 100;
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}
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/**
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* Generate captcha
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*
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* @return string captcha ID
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*/
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public function generate()
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{
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$id = parent::generate();
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$tries = 5;
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// If there's already such file, try creating a new ID
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while($tries-- && file_exists($this->getImgDir() . $id . $this->getSuffix())) {
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$id = $this->_generateRandomId();
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$this->_setId($id);
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}
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$this->_generateImage($id, $this->getWord());
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if (mt_rand(1, $this->getGcFreq()) == 1) {
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$this->_gc();
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}
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return $id;
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}
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/**
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* Generate image captcha
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*
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* Override this function if you want different image generator
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* Wave transform from http://www.captcha.ru/captchas/multiwave/
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*
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* @param string $id Captcha ID
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* @param string $word Captcha word
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*/
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protected function _generateImage($id, $word)
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{
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if (!extension_loaded("gd")) {
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require_once 'Zend/Captcha/Exception.php';
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throw new Zend_Captcha_Exception("Image CAPTCHA requires GD extension");
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}
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if (!function_exists("imagepng")) {
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require_once 'Zend/Captcha/Exception.php';
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throw new Zend_Captcha_Exception("Image CAPTCHA requires PNG support");
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}
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if (!function_exists("imageftbbox")) {
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require_once 'Zend/Captcha/Exception.php';
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throw new Zend_Captcha_Exception("Image CAPTCHA requires FT fonts support");
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}
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$font = $this->getFont();
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if (empty($font)) {
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require_once 'Zend/Captcha/Exception.php';
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throw new Zend_Captcha_Exception("Image CAPTCHA requires font");
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}
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$w = $this->getWidth();
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$h = $this->getHeight();
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$fsize = $this->getFontSize();
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$img_file = $this->getImgDir() . $id . $this->getSuffix();
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if(empty($this->_startImage)) {
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$img = imagecreatetruecolor($w, $h);
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} else {
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$img = imagecreatefrompng($this->_startImage);
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if(!$img) {
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require_once 'Zend/Captcha/Exception.php';
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throw new Zend_Captcha_Exception("Can not load start image");
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}
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$w = imagesx($img);
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$h = imagesy($img);
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}
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$text_color = imagecolorallocate($img, 0, 0, 0);
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$bg_color = imagecolorallocate($img, 255, 255, 255);
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imagefilledrectangle($img, 0, 0, $w-1, $h-1, $bg_color);
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$textbox = imageftbbox($fsize, 0, $font, $word);
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$x = ($w - ($textbox[2] - $textbox[0])) / 2;
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$y = ($h - ($textbox[7] - $textbox[1])) / 2;
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imagefttext($img, $fsize, 0, $x, $y, $text_color, $font, $word);
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// generate noise
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for ($i=0; $i<$this->_dotNoiseLevel; $i++) {
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imagefilledellipse($img, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color);
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}
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for($i=0; $i<$this->_lineNoiseLevel; $i++) {
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imageline($img, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color);
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}
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// transformed image
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$img2 = imagecreatetruecolor($w, $h);
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$bg_color = imagecolorallocate($img2, 255, 255, 255);
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imagefilledrectangle($img2, 0, 0, $w-1, $h-1, $bg_color);
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// apply wave transforms
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$freq1 = $this->_randomFreq();
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$freq2 = $this->_randomFreq();
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$freq3 = $this->_randomFreq();
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$freq4 = $this->_randomFreq();
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$ph1 = $this->_randomPhase();
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$ph2 = $this->_randomPhase();
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$ph3 = $this->_randomPhase();
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$ph4 = $this->_randomPhase();
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$szx = $this->_randomSize();
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$szy = $this->_randomSize();
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for ($x = 0; $x < $w; $x++) {
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for ($y = 0; $y < $h; $y++) {
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$sx = $x + (sin($x*$freq1 + $ph1) + sin($y*$freq3 + $ph3)) * $szx;
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$sy = $y + (sin($x*$freq2 + $ph2) + sin($y*$freq4 + $ph4)) * $szy;
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if ($sx < 0 || $sy < 0 || $sx >= $w - 1 || $sy >= $h - 1) {
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continue;
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} else {
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$color = (imagecolorat($img, $sx, $sy) >> 16) & 0xFF;
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$color_x = (imagecolorat($img, $sx + 1, $sy) >> 16) & 0xFF;
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$color_y = (imagecolorat($img, $sx, $sy + 1) >> 16) & 0xFF;
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$color_xy = (imagecolorat($img, $sx + 1, $sy + 1) >> 16) & 0xFF;
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}
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if ($color == 255 && $color_x == 255 && $color_y == 255 && $color_xy == 255) {
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// ignore background
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continue;
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} elseif ($color == 0 && $color_x == 0 && $color_y == 0 && $color_xy == 0) {
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// transfer inside of the image as-is
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$newcolor = 0;
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} else {
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// do antialiasing for border items
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$frac_x = $sx-floor($sx);
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$frac_y = $sy-floor($sy);
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$frac_x1 = 1-$frac_x;
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$frac_y1 = 1-$frac_y;
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$newcolor = $color * $frac_x1 * $frac_y1
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+ $color_x * $frac_x * $frac_y1
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+ $color_y * $frac_x1 * $frac_y
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+ $color_xy * $frac_x * $frac_y;
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}
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imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newcolor, $newcolor, $newcolor));
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}
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}
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// generate noise
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for ($i=0; $i<$this->_dotNoiseLevel; $i++) {
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imagefilledellipse($img2, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color);
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}
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for ($i=0; $i<$this->_lineNoiseLevel; $i++) {
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imageline($img2, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color);
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}
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imagepng($img2, $img_file);
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imagedestroy($img);
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imagedestroy($img2);
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}
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/**
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* Remove old files from image directory
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*
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*/
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protected function _gc()
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{
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$expire = time() - $this->getExpiration();
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$imgdir = $this->getImgDir();
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if(!$imgdir || strlen($imgdir) < 2) {
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// safety guard
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return;
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}
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foreach (new DirectoryIterator($imgdir) as $file) {
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if (!$file->isDot() && !$file->isDir()) {
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if ($file->getMTime() < $expire) {
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unlink($file->getPathname());
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}
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}
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}
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}
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|
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/**
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* Display the captcha
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*
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* @param Zend_View_Interface $view
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* @param mixed $element
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* @return string
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*/
|
|
public function render(Zend_View_Interface $view = null, $element = null)
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|
{
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return '<img width="'.$this->getWidth().'" height="'.$this->getHeight().'" alt="'.$this->getImgAlt().'" src="' . $this->getImgUrl() . $this->getId() . $this->getSuffix() . '"/><br/>';
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}
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}
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