110 lines
3.6 KiB
PHP
110 lines
3.6 KiB
PHP
<?php
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/**
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* WP Captcha
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* https://getwpcaptcha.com/
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* (c) WebFactory Ltd, 2022 - 2023, www.webfactoryltd.com
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*/
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class WPCaptcha_Captcha {
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// convert HEX(HTML) color notation to RGB
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static function hex2rgb($color) {
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if ($color[0] == '#') {
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$color = substr($color, 1);
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}
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if (strlen($color) == 6) {
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list($r, $g, $b) = array($color[0].$color[1],
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$color[2].$color[3],
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$color[4].$color[5]);
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} elseif (strlen($color) == 3) {
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list($r, $g, $b) = array($color[0].$color[0], $color[1].$color[1], $color[2].$color[2]);
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} else {
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return array(255, 255, 255);
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}
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$r = hexdec($r);
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$g = hexdec($g);
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$b = hexdec($b);
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return array($r, $g, $b);
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} // html2rgb
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// output captcha image
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static function generate() {
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$a = rand(0, (int) 10);
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$b = rand(0, (int) 10);
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$color = @$_GET['color'];
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$color = urldecode($color);
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if(isset($_GET['id'])){
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$captcha_cookie_name = 'wpcaptcha_captcha_' . intval($_GET['id']);
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} else{
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$captcha_cookie_name = 'wpcaptcha_captcha';
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}
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if ($a > $b) {
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$out = "$a - $b";
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$captcha_value = $a - $b;
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} else {
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$out = "$a + $b";
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$captcha_value = $a + $b;
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}
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setcookie($captcha_cookie_name, $captcha_value, time() + 60 * 5, '/');
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$font = 5;
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$width = ImageFontWidth($font) * strlen($out);
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$height = ImageFontHeight($font);
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$im = ImageCreate($width, $height);
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$x = imagesx($im) - $width ;
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$y = imagesy($im) - $height;
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$white = imagecolorallocate ($im, 255, 255, 255);
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$gray = imagecolorallocate ($im, 66, 66, 66);
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$black = imagecolorallocate ($im, 0, 0, 0);
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$trans_color = $white; //transparent color
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if ($color) {
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$color = self::hex2rgb($color);
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$new_color = imagecolorallocate ($im, $color[0], $color[1], $color[2]);
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imagefill($im, 1, 1, $new_color);
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} else {
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imagecolortransparent($im, $trans_color);
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}
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imagestring ($im, $font, $x, $y, $out, $black);
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// always add noise
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if (1 == 1) {
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$color_min = 100;
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$color_max = 200;
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$rand1 = imagecolorallocate ($im, rand($color_min,$color_max), rand($color_min,$color_max), rand($color_min,$color_max));
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$rand2 = imagecolorallocate ($im, rand($color_min,$color_max), rand($color_min,$color_max), rand($color_min,$color_max));
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$rand3 = imagecolorallocate ($im, rand($color_min,$color_max), rand($color_min,$color_max), rand($color_min,$color_max));
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$rand4 = imagecolorallocate ($im, rand($color_min,$color_max), rand($color_min,$color_max), rand($color_min,$color_max));
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$rand5 = imagecolorallocate ($im, rand($color_min,$color_max), rand($color_min,$color_max), rand($color_min,$color_max));
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$style = array($rand1, $rand2, $rand3, $rand4, $rand5);
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imagesetstyle($im, $style);
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imageline($im, rand(0, $width), 0, rand(0, $width), $height, IMG_COLOR_STYLED);
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imageline($im, rand(0, $width), 0, rand(0, $width), $height, IMG_COLOR_STYLED);
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imageline($im, rand(0, $width), 0, rand(0, $width), $height, IMG_COLOR_STYLED);
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imageline($im, rand(0, $width), 0, rand(0, $width), $height, IMG_COLOR_STYLED);
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imageline($im, rand(0, $width), 0, rand(0, $width), $height, IMG_COLOR_STYLED);
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}
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header('Cache-Control: no-cache, must-revalidate');
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header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
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header('Content-type: image/gif');
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imagegif($im);
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die();
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} // create
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} // WPCaptcha_Captcha
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if (isset($_GET['wpcaptcha-generate-image'])) {
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WPCaptcha_Captcha::generate();
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}
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