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kcaptcha.lib.php
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kcaptcha.lib.php
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<?php
# KCAPTCHA PROJECT VERSION 1.2.6
# Automatic test to tell computers and humans apart
# Copyright by Kruglov Sergei, 2006, 2007, 2008
# www.captcha.ru, www.kruglov.ru
# System requirements: PHP 4.0.6+ w/ GD
# KCAPTCHA is a free software. You can freely use it for building own site or software.
# If you use this software as a part of own sofware, you must leave copyright notices intact or add KCAPTCHA copyright notices to own.
# As a default configuration, KCAPTCHA has a small credits text at bottom of CAPTCHA image.
# You can remove it, but I would be pleased if you left it. ;)
# See kcaptcha_config.php for customization
class KCAPTCHA{
// generates keystring and image
function image(){
require(dirname(__FILE__).'/kcaptcha_config.php');
$fonts=array();
$fontsdir_absolute=dirname(__FILE__).'/'.$fontsdir;
if ($handle = opendir($fontsdir_absolute)) {
while (false !== ($file = readdir($handle))) {
if (preg_match('/\.png$/i', $file)) {
$fonts[]=$fontsdir_absolute.'/'.$file;
}
}
closedir($handle);
}
$alphabet_length=strlen($alphabet);
$font_file=$fonts[mt_rand(0, count($fonts)-1)];
$font=imagecreatefrompng($font_file);
imagealphablending($font, true);
$fontfile_width=imagesx($font);
$fontfile_height=imagesy($font)-1;
$font_metrics=array();
$symbol=0;
$reading_symbol=false;
// loading font
for($i=0;$i<$fontfile_width && $symbol<$alphabet_length;$i++){
$transparent = (imagecolorat($font, $i, 0) >> 24) == 127;
if(!$reading_symbol && !$transparent){
$font_metrics[$alphabet{$symbol}]=array('start'=>$i);
$reading_symbol=true;
continue;
}
if($reading_symbol && $transparent){
$font_metrics[$alphabet{$symbol}]['end']=$i;
$reading_symbol=false;
$symbol++;
continue;
}
}
$img=imagecreatetruecolor($width, $height);
imagealphablending($img, true);
$white=imagecolorallocate($img, 255, 255, 255);
$black=imagecolorallocate($img, 0, 0, 0);
imagefilledrectangle($img, 0, 0, $width-1, $height-1, $white);
// draw text
$x=1;
$odd=mt_rand(0,1);
if($odd==0) $odd=-1;
for($i=0;$i<$length;$i++){
$m=$font_metrics[$this->keystring{$i}];
$y=(($i%2)*$fluctuation_amplitude - $fluctuation_amplitude/2)*$odd
+ mt_rand(-round($fluctuation_amplitude/3), round($fluctuation_amplitude/3))
+ ($height-$fontfile_height)/2;
if($no_spaces){
$shift=0;
if($i>0){
$shift=10000;
for($sy=3;$sy<$fontfile_height-10;$sy+=1){
for($sx=$m['start']-1;$sx<$m['end'];$sx+=1){
$rgb=imagecolorat($font, $sx, $sy);
$opacity=$rgb>>24;
if($opacity<127){
$left=$sx-$m['start']+$x;
$py=$sy+$y;
if($py>$height) break;
for($px=min($left,$width-1);$px>$left-200 && $px>=0;$px-=1){
$color=imagecolorat($img, $px, $py) & 0xff;
if($color+$opacity<170){ // 170 - threshold
if($shift>$left-$px){
$shift=$left-$px;
}
break;
}
}
break;
}
}
}
if($shift==10000){
$shift=mt_rand(4,6);
}
}
}else{
$shift=1;
}
imagecopy($img, $font, $x-$shift, $y, $m['start'], 1, $m['end']-$m['start'], $fontfile_height);
$x+=$m['end']-$m['start']-$shift;
}
//noise
$white=imagecolorallocate($font, 255, 255, 255);
$black=imagecolorallocate($font, 0, 0, 0);
for($i=0;$i<(($height-30)*$x)*$white_noise_density;$i++){
imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $white);
}
for($i=0;$i<(($height-30)*$x)*$black_noise_density;$i++){
imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $black);
}
$center=$x/2;
// credits. To remove, see configuration file
$img2=imagecreatetruecolor($width, $height+($show_credits?12:0));
$foreground=imagecolorallocate($img2, $foreground_color[0], $foreground_color[1], $foreground_color[2]);
$background=imagecolorallocate($img2, $background_color[0], $background_color[1], $background_color[2]);
imagefilledrectangle($img2, 0, 0, $width-1, $height-1, $background);
imagefilledrectangle($img2, 0, $height, $width-1, $height+12, $foreground);
$credits=empty($credits)?$_SERVER['HTTP_HOST']:$credits;
imagestring($img2, 2, $width/2-imagefontwidth(2)*strlen($credits)/2, $height-2, $credits, $background);
// periods
$rand1=mt_rand(750000,1200000)/10000000;
$rand2=mt_rand(750000,1200000)/10000000;
$rand3=mt_rand(750000,1200000)/10000000;
$rand4=mt_rand(750000,1200000)/10000000;
// phases
$rand5=mt_rand(0,31415926)/10000000;
$rand6=mt_rand(0,31415926)/10000000;
$rand7=mt_rand(0,31415926)/10000000;
$rand8=mt_rand(0,31415926)/10000000;
// amplitudes
$rand9=mt_rand(330,420)/110;
$rand10=mt_rand(330,450)/110;
//wave distortion
for($x=0;$x<$width;$x++){
for($y=0;$y<$height;$y++){
if ($wave) {
$sx=$x+(sin($x*$rand1+$rand5)+sin($y*$rand3+$rand6))*$rand9-$width/2+$center+1;
$sy=$y+(sin($x*$rand2+$rand7)+sin($y*$rand4+$rand8))*$rand10;
}
else {
$sx=$x-$width/2+$center+1;
$sy=$y+(sin($x*$rand2+$rand7)+sin($y*$rand4+$rand8))*1.5;
}
if($sx<0 || $sy<0 || $sx>=$width-1 || $sy>=$height-1){
continue;
}else{
$color=imagecolorat($img, $sx, $sy) & 0xFF;
$color_x=imagecolorat($img, $sx+1, $sy) & 0xFF;
$color_y=imagecolorat($img, $sx, $sy+1) & 0xFF;
$color_xy=imagecolorat($img, $sx+1, $sy+1) & 0xFF;
}
if($color==255 && $color_x==255 && $color_y==255 && $color_xy==255){
continue;
}else if($color==0 && $color_x==0 && $color_y==0 && $color_xy==0){
$newred=$foreground_color[0];
$newgreen=$foreground_color[1];
$newblue=$foreground_color[2];
}else{
$frsx=$sx-floor($sx);
$frsy=$sy-floor($sy);
$frsx1=1-$frsx;
$frsy1=1-$frsy;
$newcolor=(
$color*$frsx1*$frsy1+
$color_x*$frsx*$frsy1+
$color_y*$frsx1*$frsy+
$color_xy*$frsx*$frsy);
if($newcolor>255) $newcolor=255;
$newcolor=$newcolor/255;
$newcolor0=1-$newcolor;
$newred=$newcolor0*$foreground_color[0]+$newcolor*$background_color[0];
$newgreen=$newcolor0*$foreground_color[1]+$newcolor*$background_color[1];
$newblue=$newcolor0*$foreground_color[2]+$newcolor*$background_color[2];
}
imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newred, $newgreen, $newblue));
}
}
header('Expires: Mon, 26 Jul 1997 05:00:00 GMT');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Cache-Control: post-check=0, pre-check=0', FALSE);
header('Pragma: no-cache');
if(function_exists("imagejpeg")){
header("Content-Type: image/jpeg");
imagejpeg($img2, null, $jpeg_quality);
}else if(function_exists("imagegif")){
header("Content-Type: image/gif");
imagegif($img2);
}else if(function_exists("imagepng")){
header("Content-Type: image/x-png");
imagepng($img2);
}
}
// returns keystring
function getKeyString(){
return $this->keystring;
}
function setKeyString($str){
$this->keystring = $str;
}
}
// 캡챠 HTML 코드 출력
function captcha_html($class="captcha")
{
if(is_mobile())
$class .= ' m_captcha';
$html .= "\n".'<script>var g5_captcha_url = "'.G5_CAPTCHA_URL.'";</script>';
//$html .= "\n".'<script>var g5_captcha_path = "'.G5_CAPTCHA_PATH.'";</script>';
$html .= "\n".'<script src="'.G5_CAPTCHA_URL.'/kcaptcha.js"></script>';
$html .= "\n".'<fieldset id="captcha" class="'.$class.'">';
$html .= "\n".'<legend><label for="captcha_key">자동등록방지</label></legend>';
if (is_mobile()) $html .= '<audio src="#" id="captcha_audio" controls></audio>';
//$html .= "\n".'<img src="#" alt="" id="captcha_img">';
$html .= "\n".'<img src="javascript:void(0);" alt="" id="captcha_img">';
if (!is_mobile()) $html .= "\n".'<button type="button" id="captcha_mp3"><span></span>숫자음성듣기</button>';
$html .= "\n".'<button type="button" id="captcha_reload"><span></span>새로고침</button>';
$html .= '<input type="text" name="captcha_key" id="captcha_key" required class="captcha_box required" size="6" maxlength="6">';
$html .= "\n".'<span id="captcha_info">자동등록방지 숫자를 순서대로 입력하세요.</span>';
$html .= "\n".'</fieldset>';
return $html;
}
// 캡챠 사용시 자바스크립트에서 입력된 캡챠를 검사함
function chk_captcha_js()
{
return "if (!chk_captcha()) return false;\n";
}
// 세션에 저장된 캡챠값과 $_POST 로 넘어온 캡챠값을 비교
function chk_captcha()
{
$captcha_count = (int)get_session('ss_captcha_count');
if ($captcha_count > 5) {
return false;
}
if (!isset($_POST['captcha_key'])) return false;
if (!trim($_POST['captcha_key'])) return false;
if ($_POST['captcha_key'] != get_session('ss_captcha_key')) {
$_SESSION['ss_captcha_count'] = $captcha_count + 1;
return false;
}
return true;
}
?>