191 lines
6.9 KiB
PHP
191 lines
6.9 KiB
PHP
<?php
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function captcha($color, $mode, $mul, $allowed)
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{
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$bg_path = dirname(__FILE__) . '/captchabg/';
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$font_path = dirname(__FILE__) . '/fonts/';
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if ($mode == "Easy") {
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$fonr_name = 'SigmarOne.ttf';
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} elseif ($mode == "Normal") {
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$fonr_name = 'times_new_yorker.ttf';
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} elseif ($mode == "Tough") {
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$fonr_name = 'captcha_code.otf';
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} else {
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$fonr_name = 'times_new_yorker.ttf';
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}
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if ($mul == "on") {
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$captcha_config = array(
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'code' => '',
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'min_length' => 5,
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'max_length' => 5,
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'backgrounds' => array(
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$bg_path . 'text3.png',
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$bg_path . 'text2.png',
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$bg_path . 'text1.png'
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),
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'fonts' => array(
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$font_path . $fonr_name
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),
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'characters' => $allowed,
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'min_font_size' => 28,
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'max_font_size' => 28,
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'color' => $color,
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'angle_min' => 0,
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'angle_max' => 10,
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'shadow' => true,
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'shadow_color' => '#fff',
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'shadow_offset_x' => -1,
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'shadow_offset_y' => 1
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);
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} else {
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$captcha_config = array(
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'code' => '',
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'min_length' => 5,
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'max_length' => 5,
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'backgrounds' => array(
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$bg_path . 'text2.png'
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),
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'fonts' => array(
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$font_path . 'times_new_yorker.ttf'
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),
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'characters' => $allowed,
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'min_font_size' => 28,
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'max_font_size' => 28,
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'color' => $color,
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'angle_min' => 0,
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'angle_max' => 10,
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'shadow' => true,
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'shadow_color' => '#fff',
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'shadow_offset_x' => -1,
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'shadow_offset_y' => 1
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);
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}
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// Overwrite defaults with custom config values
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if (is_array($config)) {
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foreach ($config as $key => $value)
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$captcha_config[$key] = $value;
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}
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// Restrict certain values
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if ($captcha_config['min_length'] < 1)
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$captcha_config['min_length'] = 1;
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if ($captcha_config['angle_min'] < 0)
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$captcha_config['angle_min'] = 0;
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if ($captcha_config['angle_max'] > 10)
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$captcha_config['angle_max'] = 10;
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if ($captcha_config['angle_max'] < $captcha_config['angle_min'])
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$captcha_config['angle_max'] = $captcha_config['angle_min'];
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if ($captcha_config['min_font_size'] < 10)
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$captcha_config['min_font_size'] = 10;
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if ($captcha_config['max_font_size'] < $captcha_config['min_font_size'])
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$captcha_config['max_font_size'] = $captcha_config['min_font_size'];
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// Use milliseconds instead of seconds
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srand(microtime() * 100);
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// Generate CAPTCHA code if not set by user
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if (empty($captcha_config['code'])) {
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$captcha_config['code'] = '';
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$length = rand($captcha_config['min_length'], $captcha_config['max_length']);
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while (strlen($captcha_config['code']) < $length) {
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$captcha_config['code'] .= substr($captcha_config['characters'], rand() % (strlen($captcha_config['characters'])), 1);
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}
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}
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// Generate HTML for image src
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$image_src = substr(__FILE__, strlen(realpath($_SERVER['DOCUMENT_ROOT']))) . '?_CAPTCHA&t=' . urlencode(microtime());
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$image_src = '/' . ltrim(preg_replace('/\\\\/', '/', $image_src), '/');
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$_SESSION['_CAPTCHA']['config'] = serialize($captcha_config);
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return array(
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'code' => $captcha_config['code'],
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'image_src' => $image_src
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);
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}
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if (!function_exists('hex2rgb')) {
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function hex2rgb($hex_str, $return_string = false, $separator = ',')
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{
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$hex_str = preg_replace("/[^0-9A-Fa-f]/", '', $hex_str); // Gets a proper hex string
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$rgb_array = array();
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if (strlen($hex_str) == 6) {
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$color_val = hexdec($hex_str);
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$rgb_array['r'] = 0xFF & ($color_val >> 0x10);
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$rgb_array['g'] = 0xFF & ($color_val >> 0x8);
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$rgb_array['b'] = 0xFF & $color_val;
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} elseif (strlen($hex_str) == 3) {
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$rgb_array['r'] = hexdec(str_repeat(substr($hex_str, 0, 1), 2));
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$rgb_array['g'] = hexdec(str_repeat(substr($hex_str, 1, 1), 2));
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$rgb_array['b'] = hexdec(str_repeat(substr($hex_str, 2, 1), 2));
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} else {
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return false;
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}
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return $return_string ? implode($separator, $rgb_array) : $rgb_array;
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}
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}
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// Draw the image
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if (isset($_GET['_CAPTCHA'])) {
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session_start();
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$captcha_config = unserialize($_SESSION['_CAPTCHA']['config']);
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if (!$captcha_config)
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exit();
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// Use milliseconds instead of seconds
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srand(microtime() * 100);
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// Pick random background, get info, and start captcha
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$background = $captcha_config['backgrounds'][rand(0, count($captcha_config['backgrounds']) - 1)];
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list($bg_width, $bg_height, $bg_type, $bg_attr) = getimagesize($background);
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$captcha = imagecreatefrompng($background);
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$color = hex2rgb($captcha_config['color']);
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$color = imagecolorallocate($captcha, $color['r'], $color['g'], $color['b']);
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// Determine text angle
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$angle = rand($captcha_config['angle_min'], $captcha_config['angle_max']) * (rand(0, 1) == 1 ? -1 : 1);
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// Select font randomly
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$font = $captcha_config['fonts'][rand(0, count($captcha_config['fonts']) - 1)];
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// Verify font file exists
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if (!file_exists($font))
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throw new Exception('Font file not found: ' . $font);
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// Set the font size
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$font_size = rand($captcha_config['min_font_size'], $captcha_config['max_font_size']);
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$text_box_size = imagettfbbox($font_size, $angle, $font, $captcha_config['code']);
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// Determine text position
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$box_width = abs($text_box_size[6] - $text_box_size[2]);
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$box_height = abs($text_box_size[5] - $text_box_size[1]);
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$text_pos_x_min = 0;
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$text_pos_x_max = ($bg_width) - ($box_width);
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$text_pos_x = rand($text_pos_x_min, $text_pos_x_max);
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$text_pos_y_min = $box_height;
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$text_pos_y_max = ($bg_height) - ($box_height / 2);
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$text_pos_y = rand($text_pos_y_min, $text_pos_y_max);
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// Draw shadow
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if ($captcha_config['shadow']) {
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$shadow_color = hex2rgb($captcha_config['shadow_color']);
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$shadow_color = imagecolorallocate($captcha, $shadow_color['r'], $shadow_color['g'], $shadow_color['b']);
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imagettftext($captcha, $font_size, $angle, $text_pos_x + $captcha_config['shadow_offset_x'], $text_pos_y + $captcha_config['shadow_offset_y'], $shadow_color, $font, $captcha_config['code']);
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}
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// Draw text
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imagettftext($captcha, $font_size, $angle, $text_pos_x, $text_pos_y, $color, $font, $captcha_config['code']);
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// Output image
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header("Content-type: image/png");
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imagepng($captcha);
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} |