/**
* Constructs a new challenge.
*
* @return void
*/
public function __construct()
{
Captcha::$config = array_merge(Kohana::config('captcha/' . Captcha::$config['style']), Kohana::config('captcha.' . Captcha::$config['group']), Captcha::$config);
if (!empty($_POST) && !empty(Captcha::$config['field']) && !empty($_POST['g-recaptcha-response'])) {
$_POST[Captcha::$config['field']] = $_POST['g-recaptcha-response'];
}
}
public static function instance($group = 'alpha')
{
if (!isset(Captcha::$instance)) {
$config = Kohana::config('captcha');
Captcha::$config = $config;
//$style = $config['style'];
$class = 'Captcha_' . ucfirst($group);
Captcha::$instance = new $class($config);
}
return Captcha::$instance;
}
/**
* Constructs a new Captcha object.
*
* @throws KoException
* @param string config group name
* @return void
*/
public function __construct($config = NULL)
{
if (empty($config)) {
$config = Ko::config('captcha.default');
} elseif (is_string($config)) {
if (($config = Ko::config('captcha.' . $config)) === NULL) {
throw new KoException('captcha.undefined_group :group', array(':group' => $config));
}
}
$config_default = Ko::config('captcha.default');
// Merge the default config with the passed config
self::$config = array_merge($config_default, $config);
// If using a background image, check if it exists
if (!empty($config['background'])) {
self::$config['background'] = str_replace('\\', '/', realpath($config['background']));
if (!is_file(self::$config['background'])) {
throw new KoException('captcha.file_not_found :background', array(':background' => self::$config['background']));
}
}
// If using any fonts, check if they exist
if (!empty($config['fonts'])) {
self::$config['fontpath'] = str_replace('\\', '/', realpath($config['fontpath'])) . '/';
foreach ($config['fonts'] as $font) {
if (!is_file(self::$config['fontpath'] . $font)) {
throw new KoException('captcha.file_not_found :font', array(':font' => self::$config['fontpath'] . $font));
}
}
}
// Set driver name
$driver = 'Captcha_' . ucfirst($config['style']);
// Load the driver
if (!Ko::autoload($driver)) {
throw new KoException('core.driver_not_found :style', array(':style' => $driver));
}
$this->driver = new $driver();
// Validate the driver
if (!$this->driver instanceof Captcha_Driver) {
throw new KoException('core.driver_implements :driver', array(':driver' => $config['style']));
}
}
/**
* render image
*
* @param array $config
* @return image
*/
public static function render($config = false)
{
if (is_array($config)) {
Captcha::$config = array_merge(Captcha::$config, $config);
}
if (empty(Captcha::$response)) {
Captcha::generate_challenge();
}
// Creates Captcha::$image
Captcha::image_create(Captcha::$config['background']);
// Add a random gradient
if (empty(Captcha::$config['background'])) {
$color1 = imagecolorallocate(Captcha::$image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));
$color2 = imagecolorallocate(Captcha::$image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));
Captcha::image_gradient($color1, $color2);
}
// Add a few random circles
for ($i = 0, $count = mt_rand(10, Captcha::$config['complexity'] * 3); $i < $count; $i++) {
$color = imagecolorallocatealpha(Captcha::$image, mt_rand(0, 255), mt_rand(0, 255), mt_rand(0, 255), mt_rand(80, 120));
$size = mt_rand(5, Captcha::$config['height'] / 3);
imagefilledellipse(Captcha::$image, mt_rand(0, Captcha::$config['width']), mt_rand(0, Captcha::$config['height']), $size, $size, $color);
}
// Calculate character font-size and spacing
$default_size = min(Captcha::$config['width'], Captcha::$config['height'] * 2) / strlen(Captcha::$response);
$spacing = (int) (Captcha::$config['width'] * 0.9 / strlen(Captcha::$response));
// Background alphabetic character attributes
$color_limit = mt_rand(96, 160);
$chars = 'ABEFGJKLPQRTVY';
// Draw each captcha character with varying attributes
for ($i = 0, $strlen = strlen(Captcha::$response); $i < $strlen; $i++) {
// Use different fonts if available
$font = Core::find_file('data', Captcha::$config['fonts'][array_rand(Captcha::$config['fonts'])], false);
$angle = mt_rand(-40, 20);
// Scale the character size on image height
$size = $default_size / 10 * mt_rand(8, 12);
if (!function_exists('imageftbbox')) {
Core::show_500(__('function imageftbbox not exist.'));
}
$box = imageftbbox($size, $angle, $font, Captcha::$response[$i]);
// Calculate character starting coordinates
$x = $spacing / 4 + $i * $spacing;
$y = Captcha::$config['height'] / 2 + ($box[2] - $box[5]) / 4;
// Draw captcha text character
// Allocate random color, size and rotation attributes to text
$color = imagecolorallocate(Captcha::$image, mt_rand(150, 255), mt_rand(200, 255), mt_rand(0, 255));
// Write text character to image
imagefttext(Captcha::$image, $size, $angle, $x, $y, $color, $font, Captcha::$response[$i]);
// Draw "ghost" alphabetic character
$text_color = imagecolorallocatealpha(Captcha::$image, mt_rand($color_limit + 8, 255), mt_rand($color_limit + 8, 255), mt_rand($color_limit + 8, 255), mt_rand(70, 120));
$char = substr($chars, mt_rand(0, 14), 1);
imagettftext(Captcha::$image, $size * 1.4, mt_rand(-45, 45), $x - mt_rand(5, 10), $y + mt_rand(5, 10), $text_color, $font, $char);
}
// Output
return Captcha::image_render();
}
