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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 | |
| * | |
| * Permission is hereby granted, free of charge, to any person obtaining a copy | |
| * of this software and associated documentation files (the "Software"), to deal | |
| * in the Software without restriction, including without limitation the rights | |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
| * copies of the Software, and to permit persons to whom the Software is | |
| * furnished to do so, subject to the following conditions: | |
| * | |
| * The above copyright notice and this permission notice shall be included in | |
| * all copies or substantial portions of the Software. | |
| * | |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
| * THE SOFTWARE. | |
| */ | |
| /** | |
| * 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 $secret shared secret between site and ReCAPTCHA server. | |
| */ | |
| function ReCaptcha($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)) . '&'; | |
| } | |
| // Cut the last '&' | |
| $req=substr($req, 0, strlen($req)-1); | |
| return $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; | |
| } | |
| } | |
| ?> |