<?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) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id$
*/
/** @see Zend_Captcha_Word */
require_once 'Zend/Captcha/Word.php';
/**
* Image-based captcha element
*
* Generates image displaying random word
*
* @category Zend
* @package Zend_Captcha
* @subpackage Adapter
* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Captcha_Image extends Zend_Captcha_Word
{
/**
* Directory for generated images
*
* @var string
*/
protected $_imgDir = "./images/captcha/";
/**
* URL for accessing images
*
* @var string
*/
protected $_imgUrl = "/images/captcha/";
/**
* Image's alt tag content
*
* @var string
*/
protected $_imgAlt = "";
/**
* Image suffix (including dot)
*
* @var string
*/
protected $_suffix = ".png";
/**
* Image width
*
* @var int
*/
protected $_width = 200;
/**
* Image height
*
* @var int
*/
protected $_height = 50;
/**
* Font size
*
* @var int
*/
protected $_fsize = 24;
/**
* Image font file
*
* @var string
*/
protected $_font;
/**
* Image to use as starting point
* Default is blank image. If provided, should be PNG image.
*
* @var string
*/
protected $_startImage;
/**
* How frequently to execute garbage collection
*
* @var int
*/
protected $_gcFreq = 10;
/**
* How long to keep generated images
*
* @var int
*/
protected $_expiration = 600;
/**
* Number of noise dots on image
* Used twice - before and after transform
*
* @var int
*/
protected $_dotNoiseLevel = 100;
/**
* Number of noise lines on image
* Used twice - before and after transform
*
* @var int
*/
protected $_lineNoiseLevel = 5;
/**
* @return string
*/
public function getImgAlt ()
{
return $this->_imgAlt;
}
/**
* @return string
*/
public function getStartImage ()
{
return $this->_startImage;
}
/**
* @return int
*/
public function getDotNoiseLevel ()
{
return $this->_dotNoiseLevel;
}
/**
* @return int
*/
public function getLineNoiseLevel ()
{
return $this->_lineNoiseLevel;
}
/**
* Get captcha expiration
*
* @return int
*/
public function getExpiration()
{
return $this->_expiration;
}
/**
* Get garbage collection frequency
*
* @return int
*/
public function getGcFreq()
{
return $this->_gcFreq;
}
/**
* Get font to use when generating captcha
*
* @return string
*/
public function getFont()
{
return $this->_font;
}
/**
* Get font size
*
* @return int
*/
public function getFontSize()
{
return $this->_fsize;
}
/**
* Get captcha image height
*
* @return int
*/
public function getHeight()
{
return $this->_height;
}
/**
* Get captcha image directory
*
* @return string
*/
public function getImgDir()
{
return $this->_imgDir;
}
/**
* Get captcha image base URL
*
* @return string
*/
public function getImgUrl()
{
return $this->_imgUrl;
}
/**
* Get captcha image file suffix
*
* @return string
*/
public function getSuffix()
{
return $this->_suffix;
}
/**
* Get captcha image width
*
* @return int
*/
public function getWidth()
{
return $this->_width;
}
/**
* @param string $startImage
*/
public function setStartImage ($startImage)
{
$this->_startImage = $startImage;
return $this;
}
/**
* @param int $dotNoiseLevel
*/
public function setDotNoiseLevel ($dotNoiseLevel)
{
$this->_dotNoiseLevel = $dotNoiseLevel;
return $this;
}
/**
* @param int $lineNoiseLevel
*/
public function setLineNoiseLevel ($lineNoiseLevel)
{
$this->_lineNoiseLevel = $lineNoiseLevel;
return $this;
}
/**
* Set captcha expiration
*
* @param int $expiration
* @return Zend_Captcha_Image
*/
public function setExpiration($expiration)
{
$this->_expiration = $expiration;
return $this;
}
/**
* Set garbage collection frequency
*
* @param int $gcFreq
* @return Zend_Captcha_Image
*/
public function setGcFreq($gcFreq)
{
$this->_gcFreq = $gcFreq;
return $this;
}
/**
* Set captcha font
*
* @param string $font
* @return Zend_Captcha_Image
*/
public function setFont($font)
{
$this->_font = $font;
return $this;
}
/**
* Set captcha font size
*
* @param int $fsize
* @return Zend_Captcha_Image
*/
public function setFontSize($fsize)
{
$this->_fsize = $fsize;
return $this;
}
/**
* Set captcha image height
*
* @param int $height
* @return Zend_Captcha_Image
*/
public function setHeight($height)
{
$this->_height = $height;
return $this;
}
/**
* Set captcha image storage directory
*
* @param string $imgDir
* @return Zend_Captcha_Image
*/
public function setImgDir($imgDir)
{
$this->_imgDir = rtrim($imgDir, "/\\") . '/';
return $this;
}
/**
* Set captcha image base URL
*
* @param string $imgUrl
* @return Zend_Captcha_Image
*/
public function setImgUrl($imgUrl)
{
$this->_imgUrl = rtrim($imgUrl, "/\\") . '/';
return $this;
}
/**
* @param string $imgAlt
*/
public function setImgAlt ($imgAlt)
{
$this->_imgAlt = $imgAlt;
return $this;
}
/**
* Set captch image filename suffix
*
* @param string $suffix
* @return Zend_Captcha_Image
*/
public function setSuffix($suffix)
{
$this->_suffix = $suffix;
return $this;
}
/**
* Set captcha image width
*
* @param int $width
* @return Zend_Captcha_Image
*/
public function setWidth($width)
{
$this->_width = $width;
return $this;
}
/**
* Generate random frequency
*
* @return float
*/
protected function _randomFreq()
{
return mt_rand(700000, 1000000) / 15000000;
}
/**
* Generate random phase
*
* @return float
*/
protected function _randomPhase()
{
// random phase from 0 to pi
return mt_rand(0, 3141592) / 1000000;
}
/**
* Generate random character size
*
* @return int
*/
protected function _randomSize()
{
return mt_rand(300, 700) / 100;
}
/**
* Generate captcha
*
* @return string captcha ID
*/
public function generate()
{
$id = parent::generate();
$tries = 5;
// If there's already such file, try creating a new ID
while($tries-- && file_exists($this->getImgDir() . $id . $this->getSuffix())) {
$id = $this->_generateRandomId();
$this->_setId($id);
}
$this->_generateImage($id, $this->getWord());
if (mt_rand(1, $this->getGcFreq()) == 1) {
$this->_gc();
}
return $id;
}
/**
* Generate image captcha
*
* Override this function if you want different image generator
* Wave transform from http://www.captcha.ru/captchas/multiwave/
*
* @param string $id Captcha ID
* @param string $word Captcha word
*/
protected function _generateImage($id, $word)
{
if (!extension_loaded("gd")) {
require_once 'Zend/Captcha/Exception.php';
throw new Zend_Captcha_Exception("Image CAPTCHA requires GD extension");
}
if (!function_exists("imagepng")) {
require_once 'Zend/Captcha/Exception.php';
throw new Zend_Captcha_Exception("Image CAPTCHA requires PNG support");
}
if (!function_exists("imageftbbox")) {
require_once 'Zend/Captcha/Exception.php';
throw new Zend_Captcha_Exception("Image CAPTCHA requires FT fonts support");
}
$font = $this->getFont();
if (empty($font)) {
require_once 'Zend/Captcha/Exception.php';
throw new Zend_Captcha_Exception("Image CAPTCHA requires font");
}
$w = $this->getWidth();
$h = $this->getHeight();
$fsize = $this->getFontSize();
$img_file = $this->getImgDir() . $id . $this->getSuffix();
if(empty($this->_startImage)) {
$img = imagecreatetruecolor($w, $h);
} else {
$img = imagecreatefrompng($this->_startImage);
if(!$img) {
require_once 'Zend/Captcha/Exception.php';
throw new Zend_Captcha_Exception("Can not load start image");
}
$w = imagesx($img);
$h = imagesy($img);
}
$text_color = imagecolorallocate($img, 0, 0, 0);
$bg_color = imagecolorallocate($img, 255, 255, 255);
imagefilledrectangle($img, 0, 0, $w-1, $h-1, $bg_color);
$textbox = imageftbbox($fsize, 0, $font, $word);
$x = ($w - ($textbox[2] - $textbox[0])) / 2;
$y = ($h - ($textbox[7] - $textbox[1])) / 2;
imagefttext($img, $fsize, 0, $x, $y, $text_color, $font, $word);
// generate noise
for ($i=0; $i<$this->_dotNoiseLevel; $i++) {
imagefilledellipse($img, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color);
}
for($i=0; $i<$this->_lineNoiseLevel; $i++) {
imageline($img, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color);
}
// transformed image
$img2 = imagecreatetruecolor($w, $h);
$bg_color = imagecolorallocate($img2, 255, 255, 255);
imagefilledrectangle($img2, 0, 0, $w-1, $h-1, $bg_color);
// apply wave transforms
$freq1 = $this->_randomFreq();
$freq2 = $this->_randomFreq();
$freq3 = $this->_randomFreq();
$freq4 = $this->_randomFreq();
$ph1 = $this->_randomPhase();
$ph2 = $this->_randomPhase();
$ph3 = $this->_randomPhase();
$ph4 = $this->_randomPhase();
$szx = $this->_randomSize();
$szy = $this->_randomSize();
for ($x = 0; $x < $w; $x++) {
for ($y = 0; $y < $h; $y++) {
$sx = $x + (sin($x*$freq1 + $ph1) + sin($y*$freq3 + $ph3)) * $szx;
$sy = $y + (sin($x*$freq2 + $ph2) + sin($y*$freq4 + $ph4)) * $szy;
if ($sx < 0 || $sy < 0 || $sx >= $w - 1 || $sy >= $h - 1) {
continue;
} else {
$color = (imagecolorat($img, $sx, $sy) >> 16) & 0xFF;
$color_x = (imagecolorat($img, $sx + 1, $sy) >> 16) & 0xFF;
$color_y = (imagecolorat($img, $sx, $sy + 1) >> 16) & 0xFF;
$color_xy = (imagecolorat($img, $sx + 1, $sy + 1) >> 16) & 0xFF;
}
if ($color == 255 && $color_x == 255 && $color_y == 255 && $color_xy == 255) {
// ignore background
continue;
} elseif ($color == 0 && $color_x == 0 && $color_y == 0 && $color_xy == 0) {
// transfer inside of the image as-is
$newcolor = 0;
} else {
// do antialiasing for border items
$frac_x = $sx-floor($sx);
$frac_y = $sy-floor($sy);
$frac_x1 = 1-$frac_x;
$frac_y1 = 1-$frac_y;
$newcolor = $color * $frac_x1 * $frac_y1
+ $color_x * $frac_x * $frac_y1
+ $color_y * $frac_x1 * $frac_y
+ $color_xy * $frac_x * $frac_y;
}
imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newcolor, $newcolor, $newcolor));
}
}
// generate noise
for ($i=0; $i<$this->_dotNoiseLevel; $i++) {
imagefilledellipse($img2, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color);
}
for ($i=0; $i<$this->_lineNoiseLevel; $i++) {
imageline($img2, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color);
}
imagepng($img2, $img_file);
imagedestroy($img);
imagedestroy($img2);
}
/**
* Remove old files from image directory
*
*/
protected function _gc()
{
$expire = time() - $this->getExpiration();
$imgdir = $this->getImgDir();
if(!$imgdir || strlen($imgdir) < 2) {
// safety guard
return;
}
$suffixLength = strlen($this->_suffix);
foreach (new DirectoryIterator($imgdir) as $file) {
if (!$file->isDot() && !$file->isDir()) {
if (file_exists($file->getPathname()) && $file->getMTime() < $expire) {
// only deletes files ending with $this->_suffix
if (substr($file->getFilename(), -($suffixLength)) == $this->_suffix) {
unlink($file->getPathname());
}
}
}
}
}
/**
* Display the captcha
*
* @param Zend_View_Interface $view
* @param mixed $element
* @return string
*/
public function render(Zend_View_Interface $view = null, $element = null)
{
$endTag = ' />';
if (($view instanceof Zend_View_Abstract) && !$view->doctype()->isXhtml()) {
$endTag = '>';
}
return '<img width="' . $this->getWidth() . '" height="' . $this->getHeight() . '" alt="' . $this->getImgAlt()
. '" src="' . $this->getImgUrl() . $this->getId() . $this->getSuffix() . '"' . $endTag;
}
}