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<?php |
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/** |
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* CAPTCHA generator script. |
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* |
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* @author Qiang Xue <[email protected]> |
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* @link https://github.com/pradosoft/prado |
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* @license https://github.com/pradosoft/prado/blob/master/LICENSE |
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* @package Prado\Web\UI\WebControls\assets |
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*/ |
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namespace Prado\Web\UI\WebControls\assets; |
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define('THEME_OPAQUE_BACKGROUND', 0x0001); |
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define('THEME_NOISY_BACKGROUND', 0x0002); |
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define('THEME_HAS_GRID', 0x0004); |
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define('THEME_HAS_SCRIBBLE', 0x0008); |
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define('THEME_MORPH_BACKGROUND', 0x0010); |
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define('THEME_SHADOWED_TEXT', 0x0020); |
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require_once(__DIR__ . '/captcha_key.php'); |
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$token = 'error'; |
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$theme = 0; |
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if (isset($_GET['options'])) { |
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$str = base64_decode($_GET['options']); |
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if (strlen($str) > 32) { |
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$hash = substr($str, 0, 32); |
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$str = substr($str, 32); |
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if (md5($privateKey . $str) === $hash) { |
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$options = unserialize($str); |
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$publicKey = $options['publicKey']; |
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$tokenLength = $options['tokenLength']; |
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$caseSensitive = $options['caseSensitive']; |
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$alphabet = $options['alphabet']; |
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$fontSize = $options['fontSize']; |
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$theme = $options['theme']; |
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if (($randomSeed = $options['randomSeed']) > 0) { |
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srand($randomSeed); |
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} else { |
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srand((int) (microtime() * 1000000)); |
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} |
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$token = generateToken($publicKey, $privateKey, $alphabet, $tokenLength, $caseSensitive); |
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} |
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} |
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} |
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displayToken($token, $fontSize, $theme); |
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function generateToken($publicKey, $privateKey, $alphabet, $tokenLength, $caseSensitive) |
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{ |
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$token = substr(hash2string(md5($publicKey . $privateKey), $alphabet) . hash2string(md5($privateKey . $publicKey), $alphabet), 0, $tokenLength); |
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return $caseSensitive ? $token : strtoupper($token); |
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} |
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function hash2string($hex, $alphabet) |
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{ |
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if (strlen($alphabet) < 2) { |
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$alphabet = '234578adefhijmnrtABDEFGHJLMNRT'; |
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} |
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$hexLength = strlen($hex); |
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$base = strlen($alphabet); |
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$result = ''; |
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for ($i = 0;$i < $hexLength;$i += 6) { |
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$number = hexdec(substr($hex, $i, 6)); |
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while ($number) { |
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$result .= $alphabet[$number % $base]; |
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$number = floor($number / $base); |
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} |
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} |
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return $result; |
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} |
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function displayToken($token, $fontSize, $theme) |
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{ |
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if (($fontSize = (int) $fontSize) < 22) { |
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$fontSize = 22; |
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} |
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if ($fontSize > 100) { |
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$fontSize = 100; |
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} |
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$length = strlen($token); |
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$padding = 10; |
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$fontWidth = $fontSize; |
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$fontHeight = floor($fontWidth * 1.5); |
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$width = $fontWidth * $length + $padding * 2; |
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$height = $fontHeight; |
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$image = imagecreatetruecolor($width, $height); |
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addBackground( |
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$image, |
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$width, |
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$height, |
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$theme & THEME_OPAQUE_BACKGROUND, |
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$theme & THEME_NOISY_BACKGROUND, |
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$theme & THEME_HAS_GRID, |
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$theme & THEME_HAS_SCRIBBLE, |
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$theme & THEME_MORPH_BACKGROUND |
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); |
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$font = __DIR__ . DIRECTORY_SEPARATOR . 'verase.ttf'; |
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if (function_exists('imagefilter')) { |
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imagefilter($image, IMG_FILTER_GAUSSIAN_BLUR); |
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} |
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$hasShadow = ($theme & THEME_SHADOWED_TEXT); |
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for ($i = 0;$i < $length;$i++) { |
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$color = imagecolorallocate($image, rand(150, 220), rand(150, 220), rand(150, 220)); |
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$size = rand($fontWidth - 10, $fontWidth); |
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$angle = rand(-30, 30); |
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$x = $padding + $i * $fontWidth; |
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$y = rand($fontHeight - 15, $fontHeight - 10); |
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imagettftext($image, $size, $angle, $x, $y, $color, $font, $token[$i]); |
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if ($hasShadow) { |
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imagettftext($image, $size, $angle, $x + 2, $y + 2, $color, $font, $token[$i]); |
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} |
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imagecolordeallocate($image, $color); |
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} |
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header('Content-Type: image/png'); |
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imagepng($image); |
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imagedestroy($image); |
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} |
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function addBackground($image, $width, $height, $opaque, $noisy, $hasGrid, $hasScribble, $morph) |
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{ |
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$background = imagecreatetruecolor($width * 2, $height * 2); |
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$white = imagecolorallocate($background, 255, 255, 255); |
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imagefill($background, 0, 0, $white); |
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if ($opaque) { |
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imagefill($background, 0, 0, imagecolorallocate($background, 100, 100, 100)); |
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} |
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if ($noisy) { |
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addNoise($background, $width * 2, $height * 2); |
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} |
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if ($hasGrid) { |
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addGrid($background, $width * 2, $height * 2); |
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} |
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if ($hasScribble) { |
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addScribble($background, $width * 2, $height * 2); |
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} |
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if ($morph) { |
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morphImage($background, $width * 2, $height * 2); |
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} |
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imagecopy($image, $background, 0, 0, 30, 30, $width, $height); |
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if (!$opaque) { |
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imagecolortransparent($image, $white); |
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} |
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} |
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function addNoise($image, $width, $height) |
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{ |
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for ($x = 0;$x < $width;++$x) { |
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for ($y = 0;$y < $height;++$y) { |
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if (rand(0, 100) < 25) { |
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$color = imagecolorallocate($image, rand(150, 220), rand(150, 220), rand(150, 220)); |
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imagesetpixel($image, $x, $y, $color); |
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imagecolordeallocate($image, $color); |
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} |
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} |
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} |
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} |
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function addGrid($image, $width, $height) |
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{ |
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for ($i = 0;$i < $width;$i += rand(15, 25)) { |
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imagesetthickness($image, rand(2, 6)); |
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$color = imagecolorallocate($image, rand(100, 180), rand(100, 180), rand(100, 180)); |
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imageline($image, $i + rand(-10, 20), 0, $i + rand(-10, 20), $height, $color); |
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imagecolordeallocate($image, $color); |
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} |
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for ($i = 0;$i < $height;$i += rand(15, 25)) { |
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imagesetthickness($image, rand(2, 6)); |
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$color = imagecolorallocate($image, rand(100, 180), rand(100, 180), rand(100, 180)); |
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imageline($image, 0, $i + rand(-10, 20), $width, $i + rand(-10, 20), $color); |
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imagecolordeallocate($image, $color); |
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} |
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} |
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function addScribble($image, $width, $height) |
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{ |
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for ($i = 0;$i < 8;$i++) { |
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$color = imagecolorallocate($image, rand(100, 180), rand(100, 180), rand(100, 180)); |
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$points = []; |
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for ($j = 1;$j < rand(5, 10);$j++) { |
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$points[] = rand(2 * (20 * ($i + 1)), 2 * (50 * ($i + 1))); |
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$points[] = rand(30, $height + 30); |
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} |
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imagesetthickness($image, rand(2, 6)); |
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imagepolygon($image, $points, (int) (count($points) / 2), $color); |
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imagecolordeallocate($image, $color); |
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} |
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} |
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function morphImage($image, $width, $height) |
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{ |
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$tempImage = imagecreatetruecolor($width, $height); |
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$chunk = rand(1, 5); |
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for ($x = $y = 0;$x < $width;$x += $chunk) { |
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$chunk = rand(1, 5); |
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$y += rand(-1, 1); |
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if ($y >= $height) { |
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$y = $height - 5; |
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} |
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if ($y < 0) { |
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$y = 5; |
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} |
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imagecopy($tempImage, $image, $x, 0, $x, $y, $chunk, $height); |
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} |
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for ($x = $y = 0;$y < $height;$y += $chunk) { |
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$chunk = rand(1, 5); |
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$x += rand(-1, 1); |
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if ($x >= $width) { |
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$x = $width - 5; |
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} |
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if ($x < 0) { |
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$x = 5; |
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} |
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imagecopy($image, $tempImage, $x, $y, 0, $y, $width, $chunk); |
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} |
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} |
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pradosoft /
prado
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