diff --git a/lib/kcaptcha/kcaptcha.php b/lib/kcaptcha/kcaptcha.php index 1e2fa37..5de0357 100644 --- a/lib/kcaptcha/kcaptcha.php +++ b/lib/kcaptcha/kcaptcha.php @@ -1,10 +1,10 @@ keystring=''; - for($i=0;$i<$length;$i++){ - $this->keystring.=$allowed_symbols{mt_rand(0,strlen($allowed_symbols)-1)}; - } - if(!preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp|ww/', $this->keystring)) break; - } - - $font_file=$fonts[mt_rand(0, count($fonts)-1)]; - $font=imagecreatefrompng($font_file); - imagealphablending($font, true); + 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); + + do{ + // generating random keystring + while(true){ + $this->keystring=''; + for($i=0;$i<$length;$i++){ + $this->keystring.=substr($allowed_symbols, mt_rand(0,strlen($allowed_symbols)-1), 1); + } + if(!preg_match('/cp|cb|ck|c6|c9|rn|rm|mm|co|do|cl|db|qp|qb|dp|ww/', $this->keystring)) break; + } + + $font_file=$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; + $fontfile_width=imagesx($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, $i, 0) >> 24) == 127; + // loading font + for($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){ + $font_metrics[substr($alphabet, $symbol, 1)]=array('start'=>$i); + $reading_symbol=true; + continue; + } - if($reading_symbol && $transparent){ - $font_metrics[$alphabet{$symbol}]['end']=$i; - $reading_symbol=false; - $symbol++; - continue; - } - } + if($reading_symbol && $transparent){ + $font_metrics[substr($alphabet, $symbol, 1)]['end']=$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); + $img=imagecreatetruecolor($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, $white); + imagefilledrectangle($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}]; + // draw text + $x=1; + $odd=mt_rand(0,1); + if($odd==0) $odd=-1; + for($i=0;$i<$length;$i++){ + $m=$font_metrics[substr($this->keystring, $i, 1)]; - $y=(($i%2)*$fluctuation_amplitude - $fluctuation_amplitude/2)*$odd - + mt_rand(-round($fluctuation_amplitude/3), round($fluctuation_amplitude/3)) - + ($height-$fontfile_height)/2; + $y=(($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){ - $shift=mt_rand(4,6); - } + if($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; - } - }while($x>=$width-10); // while not fit in canvas + } + }else{ + $shift=1; + } + imagecopy($img, $font, $x-$shift, $y, $m['start'], 1, $m['end']-$m['start'], $fontfile_height); + $x+=$m['end']-$m['start']-$shift; + } + }while($x>=$width-10); // while not fit in canvas - //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); - } + //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; + + $center=$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); + // 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)/100; + // 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; + $rand10=mt_rand(330,450)/100; - //wave distortion + //wave distortion - for($x=0;$x<$width;$x++){ - for($y=0;$y<$height;$y++){ - $sx=$x+(sin($x*$rand1+$rand5)+sin($y*$rand3+$rand6))*$rand9-$width/2+$center+1; - $sy=$y+(sin($x*$rand2+$rand7)+sin($y*$rand4+$rand8))*$rand10; + for($x=0;$x<$width;$x++){ + for($y=0;$y<$height;$y++){ + $sx=$x+(sin($x*$rand1+$rand5)+sin($y*$rand3+$rand6))*$rand9-$width/2+$center+1; + $sy=$y+(sin($x*$rand2+$rand7)+sin($y*$rand4+$rand8))*$rand10; - if($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, $sy+1) & 0xFF; - } + if($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; + 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); + $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; + 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]; - } + $newred=$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($img2); - } - } + imagesetpixel($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; - } + // returns keystring + function getKeyString(){ + return $this->keystring; + } } ?> \ No newline at end of file