/plugins/cforms/cforms-captcha.php
PHP | 167 lines | 118 code | 42 blank | 7 comment | 15 complexity | 3280227782092bca40a80ae25a64d7b7 MD5 | raw file
Possible License(s): GPL-3.0, LGPL-3.0
- <?php
- $min = prep( $_REQUEST['c1'],4 );
- $max = prep( $_REQUEST['c2'],5 );
- $src = prep( $_REQUEST['ac'], 'abcdefghijkmnpqrstuvwxyz23456789');
-
- $img_sz_type = 0;
- $img_sz_width = prep($_REQUEST['w'],115);
- $img_sz_height = prep($_REQUEST['h'],25);
-
- $im_bg = 0;
- $im_bg_type = 1;
- $im_bg_url = 'captchabg/' . ( prep($_REQUEST['b'],'1.gif') );
-
- $fontUsed = 0;
- $font_url = 'captchafonts/' . ( prep($_REQUEST['f'],'font4.ttf') );
- $fonts_dir = 'captchafonts';
-
- $min_font_size = prep($_REQUEST['f1'],17);
- $max_font_size = prep($_REQUEST['f2'],19);
-
- $min_angle = prep($_REQUEST['a1'],-12);
- $max_angle = prep($_REQUEST['a2'],12);
-
- $col_txt_type = 4;
- $col = prep($_REQUEST['c'],'000066');
- $col_txt_r = hexdec(substr($col,0,2));
- $col_txt_g = hexdec(substr($col,2,2));
- $col_txt_b = hexdec(substr($col,4,2));
-
- $border = prep($_REQUEST['l'],'000066');
- $border_r = hexdec(substr($border,0,2));
- $border_g = hexdec(substr($border,2,2));
- $border_b = hexdec(substr($border,4,2));
-
- $char_padding = 2;
- $output_type = 'png';
-
- $no = prep($_REQUEST['ts'],'');
-
- ### captcha random code
- $srclen = strlen($src)-1;
- $length = mt_rand($min,$max);
-
- $turing = '';
- for($i=0; $i<$length; $i++)
- $turing .= substr($src, mt_rand(0, $srclen), 1);
-
- $tu = ($_REQUEST['i']=='i')?strtolower($turing):$turing;
-
- setcookie('turing_string_'.$no, $_REQUEST['i'].'+'.md5($tu),(time()+60*60*5),"/");
-
- if ($fontUsed == 1 ) {
- $fontno = mt_rand(1,34);
- $font = $fonts_dir . '/font' . $fontno . '.ttf';
- }
- else $font = $font_url;
-
- ### initialize variables
-
- $length = strlen($turing);
- $data = array();
- $image_width = $image_height = 0;
-
- $codelen = 0;
-
- ### build the data array of the characters, size, placement, etc.
-
- for($i=0; $i<$length; $i++) {
- $char = substr($turing, $i, 1);
-
- $size = mt_rand($min_font_size, $max_font_size);
- $angle = mt_rand($min_angle, $max_angle);
-
- $bbox = ImageTTFBBox( $size, $angle, $font, $char );
-
- $char_width = max($bbox[2], $bbox[4]) - min($bbox[0], $bbox[6]);
- $char_height = max($bbox[1], $bbox[3]) - min($bbox[7], $bbox[5]);
-
- $codelen = $codelen + $char_width + $char_padding;
-
- $image_width += $char_width + $char_padding;
- $image_height = max($image_height, $char_height);
- $data[] = array('char'=>$char,'size'=>$size,'angle'=>$angle,'height'=>$char_height,'width'=>$char_width);
- }
-
- ### calculate the final image size, adding some padding
-
- $x_padding = 12;
- if ( $img_sz_type == 1 ) {
- $image_width += ($x_padding * 2);
- $image_height = ($image_height * 1.5) + 2;
- } else {
- $image_width = $img_sz_width;
- $image_height = $img_sz_height;
- }
-
- ### build the image, and allocte the colors
-
- $im = ImageCreate($image_width, $image_height);
- $cs = mt_rand(1,3);
-
- $d1 = $d2 = $d3 = 0;
- while ( ($d1<50) AND ($d2<50) AND ($d3<50) ) {
- $r = mt_rand(200,255); $g = mt_rand(200,255); $b = mt_rand(200,255);
- $d1 = abs($r-$g); $d2 = abs($r-$b); $d3 = abs($g-$b);
- }
-
- $color_bg = ImageColorAllocate($im, $r, $g, $b );
- $color_border = ImageColorAllocate($im, $border_r, $border_g, $border_b);
- $color_line0 = ImageColorAllocate($im, round($r*0.85), round($g*0.85), round($b*0.85) );
- $color_elipse0 = ImageColorAllocate($im, round($r*0.95), round($g*0.95), round($b*0.95) );
- $color_elipse1 = ImageColorAllocate($im, round($r*0.90), round($g*0.90), round($b*0.90) );
-
- $d1 = mt_rand(0,50); $d2 = mt_rand(0,50); $d3 = mt_rand(0,50);
-
- $color_line1 = ImageColorAllocate($im, $r-$d1, $g-$d2, $b-$d3 );
-
- $d1 = $d2 = $d3 = 0;
- while ( ($d1<100) AND ($d2<100) AND ($d3<100) ) {
- $r = mt_rand(0,150); $g = mt_rand(0,150); $b = mt_rand(0,150);
- $d1 = abs($r-$g); $d2 = abs($r-$b); $d3 = abs($g-$b);
- }
-
- switch ( $col_txt_type ) {
- case 1 : $col_txt = ImageColorAllocate($im, $r, $g, $b ); break;
- case 2 : $col_txt = ImageColorAllocate($im, 0, 0, 0 ); break;
- case 3 : $col_txt = ImageColorAllocate($im, 255, 255, 255 ); break;
- case 4 : $col_txt = ImageColorAllocate($im, $col_txt_r, $col_txt_g, $col_txt_b ); break;
- }
-
- $noiset = mt_rand(1,2);
-
- $image_data=getimagesize($im_bg_url);
- $image_type=$image_data[2];
-
- if($image_type==1) $img_src=imagecreatefromgif($im_bg_url);
- elseif($image_type==2) $img_src=imagecreatefromjpeg($im_bg_url);
- elseif($image_type==3) $img_src=imagecreatefrompng($im_bg_url);
-
- if ( $im_bg_type == 1 ) {
- imagesettile($im,$img_src);
- imageFilledRectangle ($im, 0, 0, $image_width, $image_height, IMG_COLOR_TILED);
- } else
- imagecopyresampled($im,$img_src,0,0,0,0,$image_width,$image_height,$image_data[0],$image_data[1]);
-
- $pos_x = ($image_width - $codelen) / 2;
- foreach($data as $d) {
- $pos_y = ( ( $image_height + $d['height'] ) / 2 );
- ImageTTFText($im, $d['size'], $d['angle'], $pos_x, $pos_y, $col_txt, $font, $d['char'] );
- $pos_x += $d['width'] + $char_padding;
- }
-
- ### a nice border
- ImageRectangle($im, 0, 0, $image_width-1, $image_height-1, $color_border);
- switch ($output_type) {
- case 'jpeg': Header('Content-type: image/jpeg'); ImageJPEG($im,NULL,100); break;
- case 'png':
- default: Header('Content-type: image/png'); ImagePNG($im); break;
- }
-
- ImageDestroy($im);
-
- ### strip stuff
- function prep($v,$d) {
- return ($v<>'') ? stripslashes($v) : $d;
- }
- ?>