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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 a copy
15 * of this software and associated documentation files (the "Software"), to deal
16 * in the Software without restriction, including without limitation the rights
17 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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 included in
22 * all copies or substantial portions of the Software.
23 *
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
29 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
30 * THE SOFTWARE.
31 */
32/**
33 * A ReCaptchaResponse is returned from checkAnswer().
34 */
35 
36 // your secret key
37$secret = "6LcSPMAUAAAAAJa-Q1PGRJ1_4H71jp2TW3UY6LL3";
38 
39// empty response
40$response = null;
41 
42// check secret key
43$reCaptcha = new ReCaptcha($secret);
44 
45 
46class ReCaptchaResponse
47{
48    public $success;
49    public $errorCodes;
50}
51class ReCaptcha
52{
53    private static $_signupUrl = "https://www.google.com/recaptcha/admin";
54    private static $_siteVerifyUrl =
55        "https://www.google.com/recaptcha/api/siteverify?";
56    private $_secret;
57    private static $_version = "php_1.0";
58    /**
59     * Constructor.
60     *
61     * @param string $secret shared secret between site and ReCAPTCHA server.
62     */
63    function ReCaptcha($secret)
64    {
65        if ($secret == null || $secret == "") {
66            die("To use reCAPTCHA you must get an API key from <a href='"
67                . self::$_signupUrl . "'>" . self::$_signupUrl . "</a>");
68        }
69        $this->_secret=$secret;
70    }
71    /**
72     * Encodes the given data into a query string format.
73     *
74     * @param array $data array of string elements to be encoded.
75     *
76     * @return string - encoded request.
77     */
78    private function _encodeQS($data)
79    {
80        $req = "";
81        foreach ($data as $key => $value) {
82            $req .= $key . '=' . urlencode(stripslashes($value)) . '&';
83        }
84        // Cut the last '&'
85        $req=substr($req, 0, strlen($req)-1);
86        return $req;
87    }
88    /**
89     * Submits an HTTP GET to a reCAPTCHA server.
90     *
91     * @param string $path url path to recaptcha server.
92     * @param array  $data array of parameters to be sent.
93     *
94     * @return array response
95     */
96    private function _submitHTTPGet($path, $data)
97    {
98        $req = $this->_encodeQS($data);
99        $response = file_get_contents($path . $req);
100        return $response;
101    }
102    /**
103     * Calls the reCAPTCHA siteverify API to verify whether the user passes
104     * CAPTCHA test.
105     *
106     * @param string $remoteIp   IP address of end user.
107     * @param string $response   response string from recaptcha verification.
108     *
109     * @return ReCaptchaResponse
110     */
111    public function verifyResponse($remoteIp, $response)
112    {
113        // Discard empty solution submissions
114        if ($response == null || strlen($response) == 0) {
115            $recaptchaResponse = new ReCaptchaResponse();
116            $recaptchaResponse->success = false;
117            $recaptchaResponse->errorCodes = 'missing-input';
118            return $recaptchaResponse;
119        }
120        $getResponse = $this->_submitHttpGet(
121            self::$_siteVerifyUrl,
122            array (
123                'secret' => $this->_secret,
124                'remoteip' => $remoteIp,
125                'v' => self::$_version,
126                'response' => $response
127            )
128        );
129        $answers = json_decode($getResponse, true);
130        $recaptchaResponse = new ReCaptchaResponse();
131        if (trim($answers ['success']) == true) {
132            $recaptchaResponse->success = true;
133        } else {
134            $recaptchaResponse->success = false;
135            $recaptchaResponse->errorCodes = $answers [error-codes];
136        }
137        return $recaptchaResponse;
138    }
139}
140?>