* $ssl = (!empty($extra['request']->SERVER['HTTPS']) * and $extra['request']->SERVER['HTTPS'] != 'off'); * * $this->fields['recaptcha'] = new Pluf_Form_Field_ReCaptcha( * array('required' => true, * 'label' => __('Please solve this challenge'), * 'privkey' => 'PRIVATE_RECAPTCHA_KEY_HERE', * 'remoteip' => $extra['request']->remote_addr, * 'widget_attrs' => array( * 'pubkey' => 'PUBLIC_RECAPTCHA_KEY_HERE', * ), * )); * * * Then in your template, you simply need to add the ReCaptcha field: * * 
 * {if $form.f.recaptcha.errors}{$form.f.recaptcha.fieldErrors}{/if}
 * {$form.f.recaptcha|safe}
 *
* * Based on http://recaptcha.googlecode.com/files/recaptcha-php-1.10.zip * * Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net * AUTHORS: * Mike Crawford * Ben Maurer */ class Pluf_Form_Field_ReCaptcha extends Pluf_Form_Field { public $widget = 'Pluf_Form_Widget_ReCaptcha'; public $privkey = ''; public $remoteip = ''; public $extra_params = array(); public function clean($value) { // will throw the Pluf_Form_Invalid exception in case of // error. self::checkAnswer($this->privkey, $this->remoteip, $value[0], $value[1], $this->extra_params); return $value; } /** * Submits an HTTP POST to a reCAPTCHA server * * @param string Host * @param string Path * @param array Data * @param int port (80 * @return array response */ public static function httpPost($host, $path, $data, $port=80) { $req = self::qsencode($data); $http_request = "POST $path HTTP/1.0\r\n"; $http_request .= "Host: $host\r\n"; $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n"; $http_request .= "Content-Length: " . strlen($req) . "\r\n"; $http_request .= "User-Agent: reCAPTCHA/PHP\r\n"; $http_request .= "\r\n"; $http_request .= $req; if (false === ($fs=@fsockopen($host, $port, $errno, $errstr, 10))) { throw new Pluf_Form_Invalid(__('Cannot connect to the reCaptcha server for validation.')); } fwrite($fs, $http_request); $response = ''; while (!feof($fs)) { $response .= fgets($fs, 1160); // One TCP-IP packet } fclose($fs); return explode("\r\n\r\n", $response, 2); } /** * Encodes the given data into a query string format * * @param array Array of string elements to be encoded * @return string Encoded request */ public static function qsencode($data) { $d = array(); foreach ($data as $key => $value) { $d[] = $key.'='.urlencode(stripslashes($value)); } return implode('&', $d); } /** * Calls an HTTP POST function to verify if the user's guess was correct * @param string $privkey * @param string $remoteip * @param string $challenge * @param string $response * @param array $extra_params an array of extra variables to post to the server * @return ReCaptchaResponse */ public static function checkAnswer($privkey, $remoteip, $challenge, $response, $extra_params=array()) { if ($privkey == '') { throw new Pluf_Form_Invalid(__('To use reCAPTCHA you must set your API key.')); } if ($remoteip == '') { throw new Pluf_Form_Invalid(__('For security reasons, you must pass the remote ip to reCAPTCHA.')); } //discard spam submissions if (strlen($challenge) == 0 || strlen($response) == 0) { return false; } $response = self::httpPost('api-verify.recaptcha.net', '/verify', array( 'privatekey' => $privkey, 'remoteip' => $remoteip, 'challenge' => $challenge, 'response' => $response ) + $extra_params ); $answers = explode("\n", $response[1]); if (trim($answers[0]) == 'true') { return true; } else { throw new Pluf_Form_Invalid($answers[1]); } } }