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Filename : recaptchalib.php
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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 JReCaptchaResponse is returned from checkAnswer().
 */
class JReCaptchaResponse
{
	public $success;
	public $errorCodes;
}

class JReCaptcha
{
	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 $secret shared secret between site and ReCAPTCHA server.
	 */
	function JReCaptcha($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);
		$http = JHttpFactory::getHttp();
		$response = $http->get($path . '?' . $req)->body;

		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 $response response string from recaptcha verification.
	 *
	 * @return JReCaptchaResponse
	 */
	public function verifyResponse($remoteIp, $response)
	{
		// Discard empty solution submissions
		if ($response == null || strlen($response) == 0)
		{
			$recaptchaResponse = new JReCaptchaResponse();
			$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 JReCaptchaResponse();

		if (trim($answers['success']) == true)
		{
			$recaptchaResponse->success = true;
		}
		else
		{
			$recaptchaResponse->success = false;
			$recaptchaResponse->errorCodes = isset($answers['error-codes']) ? $answers['error-codes'] : '';
		}

		return $recaptchaResponse;
	}
}