Raphael Jackstadt
11 years ago
4 changed files with 275 additions and 46 deletions
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<?php |
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/** |
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* This is a PHP library that handles calling reCAPTCHA. |
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* - Documentation and latest version |
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* https://developers.google.com/recaptcha/docs/php |
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* - Get a reCAPTCHA API Key |
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* https://www.google.com/recaptcha/admin/create |
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* - Discussion group |
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* http://groups.google.com/group/recaptcha |
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* |
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* @copyright Copyright (c) 2014, Google Inc. |
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* @link http://www.google.com/recaptcha |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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|
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/** |
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* A ReCaptchaResponse is returned from checkAnswer(). |
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*/ |
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class ReCaptchaResponse |
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{ |
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public $success; |
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public $errorCodes; |
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} |
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class ReCaptcha |
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{ |
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private static $_signupUrl = "https://www.google.com/recaptcha/admin"; |
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private static $_siteVerifyUrl = |
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"https://www.google.com/recaptcha/api/siteverify?"; |
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private $_secret; |
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private static $_version = "php_1.0"; |
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|
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/** |
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* Constructor. |
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* |
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* @param string $secret shared secret between site and ReCAPTCHA server. |
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*/ |
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function ReCaptcha($secret) |
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{ |
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if ($secret == null || $secret == "") { |
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die("To use reCAPTCHA you must get an API key from <a href='" |
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. self::$_signupUrl . "'>" . self::$_signupUrl . "</a>"); |
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} |
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$this->_secret=$secret; |
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} |
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|
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/** |
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* Encodes the given data into a query string format. |
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* |
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* @param array $data array of string elements to be encoded. |
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* |
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* @return string - encoded request. |
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*/ |
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private function _encodeQS($data) |
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{ |
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$req = ""; |
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foreach ($data as $key => $value) { |
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$req .= $key . '=' . urlencode(stripslashes($value)) . '&'; |
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} |
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|
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// Cut the last '&' |
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$req=substr($req, 0, strlen($req)-1); |
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return $req; |
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} |
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|
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/** |
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* Submits an HTTP GET to a reCAPTCHA server. |
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* |
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* @param string $path url path to recaptcha server. |
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* @param array $data array of parameters to be sent. |
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* |
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* @return array response |
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*/ |
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private function _submitHTTPGet($path, $data) |
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{ |
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$req = $this->_encodeQS($data); |
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$response = file_get_contents($path . $req); |
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return $response; |
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} |
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|
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/** |
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* Calls the reCAPTCHA siteverify API to verify whether the user passes |
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* CAPTCHA test. |
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* |
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* @param string $remoteIp IP address of end user. |
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* @param string $response response string from recaptcha verification. |
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* |
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* @return ReCaptchaResponse |
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*/ |
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public function verifyResponse($remoteIp, $response) |
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{ |
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// Discard empty solution submissions |
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if ($response == null || strlen($response) == 0) { |
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$recaptchaResponse = new ReCaptchaResponse(); |
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$recaptchaResponse->success = false; |
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$recaptchaResponse->errorCodes = 'missing-input'; |
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return $recaptchaResponse; |
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} |
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|
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$getResponse = $this->_submitHttpGet( |
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self::$_siteVerifyUrl, |
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array ( |
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'secret' => $this->_secret, |
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'remoteip' => $remoteIp, |
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'v' => self::$_version, |
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'response' => $response |
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) |
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); |
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$answers = json_decode($getResponse, true); |
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$recaptchaResponse = new ReCaptchaResponse(); |
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print_r($answers); |
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if (trim($answers['success']) == true) { |
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$recaptchaResponse->success = true; |
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} else { |
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$recaptchaResponse->success = false; |
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$recaptchaResponse->errorCodes = $answers['error-codes']; |
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} |
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return $recaptchaResponse; |
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} |
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} |
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|
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?> |
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