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	trecaptchalib.php (4574B)
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	1 <?php
	2 /**
	3 * This is a PHP library that handles calling reCAPTCHA.
	4 * - Documentation and latest version
	5 * https://developers.google.com/recaptcha/docs/php
	6 * - Get a reCAPTCHA API Key
	7 * https://www.google.com/recaptcha/admin/create
	8 * - Discussion group
	9 * http://groups.google.com/group/recaptcha
	10 *
	11 * @copyright Copyright (c) 2014, Google Inc.
	12 * @link http://www.google.com/recaptcha
	13 *
	14 * Permission is hereby granted, free of charge, to any person obtaining…
	15 * of this software and associated documentation files (the "Software"),…
	16 * in the Software without restriction, including without limitation the…
	17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or …
	18 * copies of the Software, and to permit persons to whom the Software is
	19 * furnished to do so, subject to the following conditions:
	20 *
	21 * The above copyright notice and this permission notice shall be includ…
	22 * all copies or substantial portions of the Software.
	23 *
	24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRE…
	25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILI…
	26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHA…
	27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISI…
	29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALING…
	30 * THE SOFTWARE.
	31 */
	32
	33 /**
	34 * A ReCaptchaResponse is returned from checkAnswer().
	35 */
	36 class ReCaptchaResponse
	37 {
	38 public $success;
	39 public $errorCodes;
	40 }
	41
	42 class ReCaptcha
	43 {
	44 private static $_signupUrl = "https://www.google.com/recaptcha/admin…
	45 private static $_siteVerifyUrl =
	46 "https://www.google.com/recaptcha/api/siteverify?";
	47 private $_secret;
	48 private static $_version = "php_1.0";
	49
	50 /**
	51 * Constructor.
	52 *
	53 * @param string $secret shared secret between site and ReCAPTCHA se…
	54 */
	55 function ReCaptcha($secret)
	56 {
	57 if ($secret == null \|\| $secret == "") {
	58 die("To use reCAPTCHA you must get an API key from <a href='"
	59 . self::$_signupUrl . "'>" . self::$_signupUrl . "</a>");
	60 }
	61 $this->_secret=$secret;
	62 }
	63
	64 /**
	65 * Encodes the given data into a query string format.
	66 *
	67 * @param array $data array of string elements to be encoded.
	68 *
	69 * @return string - encoded request.
	70 */
	71 private function _encodeQS($data)
	72 {
	73 $req = "";
	74 foreach ($data as $key => $value) {
	75 $req .= $key . '=' . urlencode(stripslashes($value)) . '&';
	76 }
	77
	78 // Cut the last '&'
	79 $req=substr($req, 0, strlen($req)-1);
	80 return $req;
	81 }
	82
	83 /**
	84 * Submits an HTTP GET to a reCAPTCHA server.
	85 *
	86 * @param string $path url path to recaptcha server.
	87 * @param array $data array of parameters to be sent.
	88 *
	89 * @return array response
	90 */
	91 private function _submitHTTPGet($path, $data)
	92 {
	93 $req = $this->_encodeQS($data);
	94 $response = file_get_contents($path . $req);
	95 return $response;
	96 }
	97
	98 /**
	99 * Calls the reCAPTCHA siteverify API to verify whether the user pas…
	100 * CAPTCHA test.
	101 *
	102 * @param string $remoteIp IP address of end user.
	103 * @param string $response response string from recaptcha verifica…
	104 *
	105 * @return ReCaptchaResponse
	106 */
	107 public function verifyResponse($remoteIp, $response)
	108 {
	109 // Discard empty solution submissions
	110 if ($response == null \|\| strlen($response) == 0) {
	111 $recaptchaResponse = new ReCaptchaResponse();
	112 $recaptchaResponse->success = false;
	113 $recaptchaResponse->errorCodes = 'missing-input';
	114 return $recaptchaResponse;
	115 }
	116
	117 $getResponse = $this->_submitHttpGet(
	118 self::$_siteVerifyUrl,
	119 array (
	120 'secret' => $this->_secret,
	121 'remoteip' => $remoteIp,
	122 'v' => self::$_version,
	123 'response' => $response
	124 )
	125 );
	126 $answers = json_decode($getResponse, true);
	127 $recaptchaResponse = new ReCaptchaResponse();
	128
	129 if (trim($answers ['success']) == true) {
	130 $recaptchaResponse->success = true;
	131 } else {
	132 $recaptchaResponse->success = false;
	133 $recaptchaResponse->errorCodes = $answers [error-codes];
	134 }
	135
	136 return $recaptchaResponse;
	137 }
	138 }
	139
	140 ?>