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* * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ /** * sfValidatorReCaptcha validates a ReCaptcha. * * This validator uses ReCaptcha: http://recaptcha.net/ * * The ReCaptcha API documentation can be found at http://recaptcha.net/apidocs/captcha/ * * To be able to use this validator, you need an API key: http://recaptcha.net/api/getkey * * To create a captcha validator: * * $captcha = new sfValidatorReCaptcha(array('private_key' => RECAPTCHA_PRIVATE_KEY)); * * where RECAPTCHA_PRIVATE_KEY is the ReCaptcha private key. * * @package symfony * @subpackage validator * @author Fabien Potencier * @version SVN: $Id: sfValidatorReCaptcha.class.php 7903 2008-03-15 13:17:41Z fabien $ */ class sfValidatorReCaptcha extends sfValidatorBase { /** * Configures the current validator. * * Available options: * * * private_key: The ReCaptcha private key (required) * * remote_addr: The remote address of the user * * server_host: The ReCaptcha server host * * server_port: The ReCaptcha server port * * server_path: The ReCatpcha server path * * server_timeout: The timeout to use when contacting the ReCaptcha server * * Available error codes: * * * captcha * * server_problem * * @see sfValidatorBase */ protected function configure($options = array(), $messages = array()) { $this->addRequiredOption('private_key'); $this->addOption('remote_addr'); $this->addOption('server_host', 'api-verify.recaptcha.net'); $this->addOption('server_port', 80); $this->addOption('server_path', '/verify'); $this->addOption('server_timeout', 10); $this->addMessage('captcha', 'The captcha is not valid (%error%).'); $this->addMessage('server_problem', 'Unable to check the captcha from the server (%error%).'); } /** * Cleans the input value. * * The input value must be an array with 2 required keys: recaptcha_challenge_field and recaptcha_response_field. * * It always returns null. * * @see sfValidatorBase */ protected function doClean($value) { $challenge = isset($value['recaptcha_challenge_field']) ? $value['recaptcha_challenge_field'] : null; $response = isset($value['recaptcha_response_field']) ? $value['recaptcha_response_field'] : null; if (empty($challenge) || empty($response)) { throw new sfValidatorError($this, 'captcha', array('error' => 'invalid captcha')); } if (true !== ($answer = $this->check(array( 'privatekey' => $this->getOption('private_key'), 'remoteip' => $this->getOption('remote_addr') ? $this->getOption('remote_addr') : $_SERVER['REMOTE_ADDR'], 'challenge' => $challenge, 'response' => $response, )))) { throw new sfValidatorError($this, 'captcha', array('error' => $answer)); } return null; } /** * Returns true if the captcha is valid. * * @param array An array of request parameters * * @return Boolean true if the captcha is valid, false otherwise */ protected function check($parameters) { if (false === ($fs = @fsockopen($this->getOption('server_host'), $this->getOption('server_port'), $errno, $errstr, $this->getOption('server_timeout')))) { throw new sfValidatorError($this, 'server_problem', array('error' => $errstr)); } $query = http_build_query($parameters, null, '&'); fwrite($fs, sprintf( "POST %s HTTP/1.0\r\n". "Host: %s\r\n". "Content-Type: application/x-www-form-urlencoded\r\n". "Content-Length: %d\r\n". "User-Agent: reCAPTCHA/PHP/symfony\r\n". "\r\n%s", $this->getOption('server_path'), $this->getOption('server_host'), strlen($query), $query) ); $response = ''; while (!feof($fs)) { $response .= fgets($fs, 1160); } fclose($fs); $response = explode("\r\n\r\n", $response, 2); $answers = explode("\n", $response[1]); return 'true' == trim($answers[0]) ? true : $answers[1]; } }