google/recaptcha

recaptcha/recaptchalib.php at 1.0.0 · google/recaptcha · GitHub

Dec 1, 2014

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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;
	}
	}

	?>

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