/**
* Constructs a new Captcha object.
*
* @throws Kohana_Exception
* @param string Config group name
* @return void
*/
public function __construct($group = NULL)
{
// Create a singleton instance once
empty(Captcha::$instance) and Captcha::$instance = $this;
// No config group name given
if (!is_string($group)) {
$group = 'default';
}
// Load and validate config group
if (!is_array($config = captcha_config($group))) {
throw new Kohana_Exception('Captcha group not defined in :group configuration', array(':group' => $group));
}
// All captcha config groups inherit default config group
if ($group !== 'default') {
// Load and validate default config group
if (!is_array($default = captcha_config('default'))) {
throw new Kohana_Exception('Captcha group not defined in :group configuration', array(':group' => 'default'));
}
// Merge config group with default config group
$config += $default;
}
// Assign config values to the object
foreach ($config as $key => $value) {
if (array_key_exists($key, Captcha::$config)) {
Captcha::$config[$key] = $value;
}
}
// Store the config group name as well, so the drivers can access it
Captcha::$config['group'] = $group;
// If using a background image, check if it exists
if (!empty($config['background'])) {
Captcha::$config['background'] = str_replace('\\', '/', realpath($config['background']));
if (!is_file(Captcha::$config['background'])) {
throw new Kohana_Exception('The specified file, :file, was not found.', array(':file' => Captcha::$config['background']));
}
}
// If using any fonts, check if they exist
if (!empty($config['fonts'])) {
Captcha::$config['fontpath'] = str_replace('\\', '/', realpath($config['fontpath'])) . '/';
foreach ($config['fonts'] as $font) {
if (!is_file(Captcha::$config['fontpath'] . $font)) {
throw new Kohana_Exception('The specified file, :file, was not found.', array(':file' => Captcha::$config['fontpath'] . $font));
}
}
}
// Generate a new challenge
$this->response = $this->generate_challenge();
}
function captcha($config = array())
{
// Check for GD library
if (!function_exists('gd_info')) {
throw new Exception('Required GD library is missing');
}
$captcha_config = captcha_config();
/*
// Overwrite defaults with custom config values
if( is_array($config) ) {
foreach( $config as $key => $value ) $captcha_config[$key] = $value;
}
// Restrict certain values
if( $captcha_config['min_length'] < 1 ) $captcha_config['min_length'] = 1;
if( $captcha_config['angle_min'] < 0 ) $captcha_config['angle_min'] = 0;
if( $captcha_config['angle_max'] > 10 ) $captcha_config['angle_max'] = 10;
if( $captcha_config['angle_max'] < $captcha_config['angle_min'] ) $captcha_config['angle_max'] = $captcha_config['angle_min'];
if( $captcha_config['min_font_size'] < 10 ) $captcha_config['min_font_size'] = 10;
if( $captcha_config['max_font_size'] < $captcha_config['min_font_size'] ) $captcha_config['max_font_size'] = $captcha_config['min_font_size'];
*/
// Use milliseconds instead of seconds
srand(microtime() * 100);
// Generate CAPTCHA code if not set by user
if (empty($captcha_config['code'])) {
$captcha_config['code'] = '';
$length = rand($captcha_config['min_length'], $captcha_config['max_length']);
while (strlen($captcha_config['code']) < $length) {
$captcha_config['code'] .= substr($captcha_config['characters'], rand() % strlen($captcha_config['characters']), 1);
}
}
// Generate image src
/*
$image_src = substr(__FILE__, strlen($_SERVER['DOCUMENT_ROOT'])) . '?_CAPTCHA&t=' . urlencode(microtime());
$image_src = '/' . ltrim(preg_replace('/\\\\/', '/', $image_src), '/');
*/
$image_src = admin_url('admin-ajax.php') . '?action=sfw2l_get_captcha&_CAPTCHA=true&t=' . urlencode(microtime());
//plugins_url( 'captcha.php', __FILE__ ) . '?_CAPTCHA&t=' . urlencode(microtime());
// direct access version, requires wp-load
//$image_src = plugins_url( 'captcha.php', __FILE__ ) . '?_CAPTCHA&t=' . urlencode(microtime());
//$_SESSION['_CAPTCHA']['config'] = serialize($captcha_config);
return array('code' => $captcha_config['code'], 'image_src' => $image_src);
}