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<?php /** * This is a PHP library that handles calling reCAPTCHA. * - Documentation and latest version * https://developers.google.com/recaptcha/docs/php * - Get a reCAPTCHA API Key * https://www.google.com/recaptcha/admin/create * - Discussion group * http://groups.google.com/group/recaptcha * * @copyright Copyright (c) 2014, Google Inc. * @link http://www.google.com/recaptcha * */ /** * A ReCaptchaResponse is returned from checkAnswer(). */ class ReCaptchaResponse { public $success; public $errorCodes; } class ReCaptcha { private static $_signupUrl = "https://www.google.com/recaptcha/admin"; private static $_siteVerifyUrl = "https://www.google.com/recaptcha/api/siteverify?"; private $_secret; private static $_version = "php_1.0"; /** * Constructor. * * @param string $secret shared secret between site and ReCAPTCHA server. */ function __construct($secret) { if ($secret == null || $secret == "") { die("To use reCAPTCHA you must get an API key from <a href='". self::$_signupUrl . "'>" . self::$_signupUrl . "</a>"); } $this->_secret=$secret; } /** * Encodes the given data into a query string format. * * @param array $data array of string elements to be encoded. * * @return string - encoded request. */ private function _encodeQS($data) { $req = ""; foreach ($data as $key => $value) { $req .= $key . '=' . urlencode(stripslashes($value)) . '&'; } return rtrim($req, '&'); } /** * Submits an HTTP GET to a reCAPTCHA server. * * @param string $path url path to recaptcha server. * @param array $data array of parameters to be sent. * * @return array response */ private function _submitHTTPGet($path, $data) { $req = $this->_encodeQS($data); $response = file_get_contents($path . $req); return $response; } /** * Calls the reCAPTCHA siteverify API to verify whether the user passes * CAPTCHA test. * * @param string $remoteIp IP address of end user. * @param string $response response string from recaptcha verification. * * @return ReCaptchaResponse */ public function verifyResponse($remoteIp, $response) { // Discard empty solution submissions if ($response == null || strlen($response) == 0) { $recaptchaResponse = new ReCaptchaResponse(); $recaptchaResponse->success = false; $recaptchaResponse->errorCodes = 'missing-input'; return $recaptchaResponse; } $getResponse = $this->_submitHttpGet( self::$_siteVerifyUrl, array ( 'secret' => $this->_secret, 'remoteip' => $remoteIp, 'v' => self::$_version, 'response' => $response ) ); $answers = json_decode($getResponse, true); $recaptchaResponse = new ReCaptchaResponse(); if (trim($answers ['success']) == true) { $recaptchaResponse->success = true; } else { $recaptchaResponse->success = false; $recaptchaResponse->errorCodes = $answers['error-codes']; } return $recaptchaResponse; } }
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