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240 lines
7.4 KiB
240 lines
7.4 KiB
<?php |
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# KCAPTCHA PROJECT VERSION 2.1 |
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# Automatic test to tell computers and humans apart |
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# Copyright by Kruglov Sergei, 2006, 2007, 2008, 2011, 2016 |
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# www.captcha.ru, www.kruglov.ru |
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# System requirements: PHP 4.0.6+ w/ GD |
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# NOTE! decomment string "function KCAPTCHA(){" and comment "function __construct(){" to complify with php below 5.0 |
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# KCAPTCHA is a free software. You can freely use it for developing own site or software. |
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# If you use this software as a part of own sofware, you must leave copyright notices intact or add KCAPTCHA copyright notices to own. |
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# As a default configuration, KCAPTCHA has a small credits text at bottom of CAPTCHA image. |
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# You can remove it, but I would be pleased if you left it. ;) |
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# See kcaptcha_config.php for customization |
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class KCAPTCHA{ |
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// generates keystring and image |
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//function KCAPTCHA(){ // old PHP declaration |
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function __construct(){ // new PHP declaration |
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require(dirname(__FILE__).'/kcaptcha_config.php'); |
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$fonts=array(); |
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$fontsdir_absolute=dirname(__FILE__).'/'.$fontsdir; |
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if ($handle = opendir($fontsdir_absolute)) { |
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while (false !== ($file = readdir($handle))) { |
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if (preg_match('/\.png$/i', $file)) { |
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$fonts[]=$fontsdir_absolute.'/'.$file; |
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} |
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} |
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closedir($handle); |
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} |
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$alphabet_length=strlen($alphabet); |
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do{ |
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// generating random keystring |
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while(true){ |
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$this->keystring=''; |
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for($i=0;$i<$length;$i++){ |
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$this->keystring.=$allowed_symbols{mt_rand(0,strlen($allowed_symbols)-1)}; |
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} |
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if(!preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp|ww/', $this->keystring)) break; |
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} |
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$font_file=$fonts[mt_rand(0, count($fonts)-1)]; |
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$font=imagecreatefrompng($font_file); |
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imagealphablending($font, true); |
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$fontfile_width=imagesx($font); |
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$fontfile_height=imagesy($font)-1; |
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$font_metrics=array(); |
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$symbol=0; |
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$reading_symbol=false; |
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// loading font |
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for($i=0;$i<$fontfile_width && $symbol<$alphabet_length;$i++){ |
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$transparent = (imagecolorat($font, $i, 0) >> 24) == 127; |
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if(!$reading_symbol && !$transparent){ |
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$font_metrics[$alphabet{$symbol}]=array('start'=>$i); |
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$reading_symbol=true; |
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continue; |
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} |
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if($reading_symbol && $transparent){ |
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$font_metrics[$alphabet{$symbol}]['end']=$i; |
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$reading_symbol=false; |
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$symbol++; |
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continue; |
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} |
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} |
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$img=imagecreatetruecolor($width, $height); |
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imagealphablending($img, true); |
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$white=imagecolorallocate($img, 255, 255, 255); |
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$black=imagecolorallocate($img, 0, 0, 0); |
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imagefilledrectangle($img, 0, 0, $width-1, $height-1, $white); |
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// draw text |
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$x=1; |
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$odd=mt_rand(0,1); |
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if($odd==0) $odd=-1; |
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for($i=0;$i<$length;$i++){ |
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$m=$font_metrics[$this->keystring{$i}]; |
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$y=(($i%2)*$fluctuation_amplitude - $fluctuation_amplitude/2)*$odd |
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+ mt_rand(-round($fluctuation_amplitude/3), round($fluctuation_amplitude/3)) |
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+ ($height-$fontfile_height)/2; |
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if($no_spaces){ |
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$shift=0; |
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if($i>0){ |
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$shift=10000; |
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for($sy=3;$sy<$fontfile_height-10;$sy+=1){ |
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for($sx=$m['start']-1;$sx<$m['end'];$sx+=1){ |
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$rgb=imagecolorat($font, $sx, $sy); |
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$opacity=$rgb>>24; |
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if($opacity<127){ |
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$left=$sx-$m['start']+$x; |
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$py=$sy+$y; |
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if($py>$height) break; |
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for($px=min($left,$width-1);$px>$left-200 && $px>=0;$px-=1){ |
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$color=imagecolorat($img, $px, $py) & 0xff; |
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if($color+$opacity<170){ // 170 - threshold |
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if($shift>$left-$px){ |
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$shift=$left-$px; |
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} |
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break; |
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} |
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} |
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break; |
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} |
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} |
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} |
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if($shift==10000){ |
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$shift=mt_rand(4,6); |
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} |
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} |
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}else{ |
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$shift=1; |
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} |
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imagecopy($img, $font, $x-$shift, $y, $m['start'], 1, $m['end']-$m['start'], $fontfile_height); |
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$x+=$m['end']-$m['start']-$shift; |
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} |
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}while($x>=$width-10); // while not fit in canvas |
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//noise |
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$white=imagecolorallocate($font, 255, 255, 255); |
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$black=imagecolorallocate($font, 0, 0, 0); |
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for($i=0;$i<(($height-30)*$x)*$white_noise_density;$i++){ |
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imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $white); |
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} |
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for($i=0;$i<(($height-30)*$x)*$black_noise_density;$i++){ |
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imagesetpixel($img, mt_rand(0, $x-1), mt_rand(10, $height-15), $black); |
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} |
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$center=$x/2; |
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// credits. To remove, see configuration file |
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$img2=imagecreatetruecolor($width, $height+($show_credits?12:0)); |
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$foreground=imagecolorallocate($img2, $foreground_color[0], $foreground_color[1], $foreground_color[2]); |
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$background=imagecolorallocate($img2, $background_color[0], $background_color[1], $background_color[2]); |
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imagefilledrectangle($img2, 0, 0, $width-1, $height-1, $background); |
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imagefilledrectangle($img2, 0, $height, $width-1, $height+12, $foreground); |
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$credits=empty($credits)?$_SERVER['HTTP_HOST']:$credits; |
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imagestring($img2, 2, $width/2-imagefontwidth(2)*strlen($credits)/2, $height-2, $credits, $background); |
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// periods |
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$rand1=mt_rand(750000,1200000)/10000000; |
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$rand2=mt_rand(750000,1200000)/10000000; |
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$rand3=mt_rand(750000,1200000)/10000000; |
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$rand4=mt_rand(750000,1200000)/10000000; |
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// phases |
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$rand5=mt_rand(0,31415926)/10000000; |
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$rand6=mt_rand(0,31415926)/10000000; |
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$rand7=mt_rand(0,31415926)/10000000; |
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$rand8=mt_rand(0,31415926)/10000000; |
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// amplitudes |
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$rand9=mt_rand(330,420)/110; |
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$rand10=mt_rand(330,450)/100; |
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//wave distortion |
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for($x=0;$x<$width;$x++){ |
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for($y=0;$y<$height;$y++){ |
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$sx=$x+(sin($x*$rand1+$rand5)+sin($y*$rand3+$rand6))*$rand9-$width/2+$center+1; |
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$sy=$y+(sin($x*$rand2+$rand7)+sin($y*$rand4+$rand8))*$rand10; |
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if($sx<0 || $sy<0 || $sx>=$width-1 || $sy>=$height-1){ |
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continue; |
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}else{ |
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$color=imagecolorat($img, $sx, $sy) & 0xFF; |
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$color_x=imagecolorat($img, $sx+1, $sy) & 0xFF; |
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$color_y=imagecolorat($img, $sx, $sy+1) & 0xFF; |
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$color_xy=imagecolorat($img, $sx+1, $sy+1) & 0xFF; |
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} |
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if($color==255 && $color_x==255 && $color_y==255 && $color_xy==255){ |
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continue; |
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}else if($color==0 && $color_x==0 && $color_y==0 && $color_xy==0){ |
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$newred=$foreground_color[0]; |
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$newgreen=$foreground_color[1]; |
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$newblue=$foreground_color[2]; |
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}else{ |
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$frsx=$sx-floor($sx); |
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$frsy=$sy-floor($sy); |
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$frsx1=1-$frsx; |
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$frsy1=1-$frsy; |
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$newcolor=( |
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$color*$frsx1*$frsy1+ |
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$color_x*$frsx*$frsy1+ |
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$color_y*$frsx1*$frsy+ |
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$color_xy*$frsx*$frsy); |
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if($newcolor>255) $newcolor=255; |
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$newcolor=$newcolor/255; |
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$newcolor0=1-$newcolor; |
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$newred=$newcolor0*$foreground_color[0]+$newcolor*$background_color[0]; |
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$newgreen=$newcolor0*$foreground_color[1]+$newcolor*$background_color[1]; |
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$newblue=$newcolor0*$foreground_color[2]+$newcolor*$background_color[2]; |
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} |
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imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newred, $newgreen, $newblue)); |
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} |
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} |
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header('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); |
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header('Cache-Control: no-store, no-cache, must-revalidate'); |
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header('Cache-Control: post-check=0, pre-check=0', FALSE); |
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header('Pragma: no-cache'); |
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if(function_exists("imagejpeg")){ |
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header("Content-Type: image/jpeg"); |
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imagejpeg($img2, null, $jpeg_quality); |
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}else if(function_exists("imagegif")){ |
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header("Content-Type: image/gif"); |
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imagegif($img2); |
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}else if(function_exists("imagepng")){ |
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header("Content-Type: image/x-png"); |
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imagepng($img2); |
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} |
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} |
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// returns keystring |
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function getKeyString(){ |
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return $this->keystring; |
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} |
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} |
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?>
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