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<?php /* Login Ninja (c) 2017. Web factory Ltd http://www.webfactoryltd.com/ */ define('UCP_MAX_CAPTCHA', 10); class ucp_captcha { // convert HEX(HTML) color notation to RGB static function hex2rgb($color) { if ($color[0] == '#') { $color = substr($color, 1); } if (strlen($color) == 6) { list($r, $g, $b) = array($color[0].$color[1], $color[2].$color[3], $color[4].$color[5]); } elseif (strlen($color) == 3) { list($r, $g, $b) = array($color[0].$color[0], $color[1].$color[1], $color[2].$color[2]); } else { return array(255, 255, 255); } $r = hexdec($r); $g = hexdec($g); $b = hexdec($b); return array($r, $g, $b); } // html2rgb // output captcha image static function generate() { $a = rand(0, (int) UCP_MAX_CAPTCHA); $b = rand(0, (int) UCP_MAX_CAPTCHA); $color = @$_GET['color']; $color = urldecode($color); if ($a > $b) { $out = "$a - $b"; $_SESSION['captcha'] = $a - $b; } else { $out = "$a + $b"; $_SESSION['captcha'] = $a + $b; } $font = 5; $width = ImageFontWidth($font) * strlen($out); $height = ImageFontHeight($font); $im = ImageCreate($width, $height); $x = imagesx($im) - $width ; $y = imagesy($im) - $height; $white = imagecolorallocate ($im, 255, 255, 255); $gray = imagecolorallocate ($im, 66, 66, 66); $black = imagecolorallocate ($im, 0, 0, 0); $trans_color = $white; //transparent colour if ($color) { $color = self::hex2rgb($color); $new_color = imagecolorallocate ($im, $color[0], $color[1], $color[2]); imagefill($im, 1, 1, $new_color); } else { imagecolortransparent($im, $trans_color); } imagestring ($im, $font, $x, $y, $out, $black); if (@$_GET['noise']) { //mess up the image a bit $style = array($black, $white, $white, $white, $black); imagesetstyle($im, $style); imageline($im, rand(0, $width), 0, rand(0, $width), $height, IMG_COLOR_STYLED); imageline($im, rand(0, $width), 0, rand(0, $width), $height, IMG_COLOR_STYLED); imageline($im, rand(0, $width), 0, rand(0, $width), $height, IMG_COLOR_STYLED); } header('Cache-Control: no-cache, must-revalidate'); header('Expires: Sat, 26 Jul 1997 05:00:00 GMT'); header('Content-type: image/gif'); imagegif($im); die(); } // create static function get() { return $_SESSION['captcha']; } // get } // wf_ln_captcha if (isset($_GET['ucp-generate-image'])) { @session_start(); ucp_captcha::generate(); }
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