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160 roytam 1 <?php
2 /*
3  * This is a PHP library that handles calling reCAPTCHA.
4  *    - Documentation and latest version
5  *          http://recaptcha.net/plugins/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 (c) 2007 reCAPTCHA -- http://recaptcha.net
12  * AUTHORS:
13  *   Mike Crawford
14  *   Ben Maurer
15  *
16  * Permission is hereby granted, free of charge, to any person obtaining a copy
17  * of this software and associated documentation files (the "Software"), to deal
18  * in the Software without restriction, including without limitation the rights
19  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
20  * copies of the Software, and to permit persons to whom the Software is
21  * furnished to do so, subject to the following conditions:
22  *
23  * The above copyright notice and this permission notice shall be included in
24  * all copies or substantial portions of the Software.
25  *
26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
29  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
30  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
31  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
32  * THE SOFTWARE.
33  */
34  
35 /**
36  * The reCAPTCHA server URL's
37  */
38 define("RECAPTCHA_API_SERVER", "http://www.google.com/recaptcha/api");
39 define("RECAPTCHA_API_SECURE_SERVER", "https://www.google.com/recaptcha/api");
40 define("RECAPTCHA_VERIFY_SERVER", "www.google.com");
41  
42 /**
43  * Encodes the given data into a query string format
44  * @param $data - array of string elements to be encoded
45  * @return string - encoded request
46  */
47 function _recaptcha_qsencode ($data) {
48         $req = "";
49         foreach ( $data as $key => $value )
50                 $req .= $key . '=' . urlencode( stripslashes($value) ) . '&';
51  
52         // Cut the last '&'
53         $req=substr($req,0,strlen($req)-1);
54         return $req;
55 }
56  
57  
58  
59 /**
60  * Submits an HTTP POST to a reCAPTCHA server
61  * @param string $host
62  * @param string $path
63  * @param array $data
64  * @param int port
65  * @return array response
66  */
67 function _recaptcha_http_post($host, $path, $data, $port = 80) {
68  
69         $req = _recaptcha_qsencode ($data);
70  
71         $http_request  = "POST $path HTTP/1.0\r\n";
72         $http_request .= "Host: $host\r\n";
73         $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n";
74         $http_request .= "Content-Length: " . strlen($req) . "\r\n";
75         $http_request .= "User-Agent: reCAPTCHA/PHP\r\n";
76         $http_request .= "\r\n";
77         $http_request .= $req;
78  
79         $response = '';
80         if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) {
81                 die ('Could not open socket');
82         }
83  
84         fwrite($fs, $http_request);
85  
86         while ( !feof($fs) )
87                 $response .= fgets($fs, 1160); // One TCP-IP packet
88         fclose($fs);
89         $response = explode("\r\n\r\n", $response, 2);
90  
91         return $response;
92 }
93  
94  
95  
96 /**
97  * Gets the challenge HTML (javascript and non-javascript version).
98  * This is called from the browser, and the resulting reCAPTCHA HTML widget
99  * is embedded within the HTML form it was called from.
100  * @param string $pubkey A public key for reCAPTCHA
101  * @param string $error The error given by reCAPTCHA (optional, default is null)
102  * @param boolean $use_ssl Should the request be made over ssl? (optional, default is false)
103  
104  * @return string - The HTML to be embedded in the user's form.
105  */
106 function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
107 {
108         if ($pubkey == null || $pubkey == '') {
109                 die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>");
110         }
111  
112         if ($use_ssl) {
113                 $server = RECAPTCHA_API_SECURE_SERVER;
114         } else {
115                 $server = RECAPTCHA_API_SERVER;
116         }
117  
118         $errorpart = "";
119         if ($error) {
120            $errorpart = "&amp;error=" . $error;
121         }
122         return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script>
123  
124         <noscript>
125                 <iframe src="'. $server . '/noscript?k=' . $pubkey . $errorpart . '" height="300" width="500" frameborder="0"></iframe><br/>
126                 <textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
127                 <input type="hidden" name="recaptcha_response_field" value="manual_challenge"/>
128         </noscript>';
129 }
130  
131  
132  
133  
134 /**
135  * A ReCaptchaResponse is returned from recaptcha_check_answer()
136  */
137 class ReCaptchaResponse {
138         var $is_valid;
139         var $error;
140 }
141  
142  
143 /**
144   * Calls an HTTP POST function to verify if the user's guess was correct
145   * @param string $privkey
146   * @param string $remoteip
147   * @param string $challenge
148   * @param string $response
149   * @param array $extra_params an array of extra variables to post to the server
150   * @return ReCaptchaResponse
151   */
152 function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response, $extra_params = array())
153 {
154         if ($privkey == null || $privkey == '') {
155                 die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>");
156         }
157  
158         if ($remoteip == null || $remoteip == '') {
159                 die ("For security reasons, you must pass the remote ip to reCAPTCHA");
160         }
161  
162  
163  
164         //discard spam submissions
165         if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
166                 $recaptcha_response = new ReCaptchaResponse();
167                 $recaptcha_response->is_valid = false;
168                 $recaptcha_response->error = 'incorrect-captcha-sol';
169                 return $recaptcha_response;
170         }
171  
172         $response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify",
173                                           array (
174                                                  'privatekey' => $privkey,
175                                                  'remoteip' => $remoteip,
176                                                  'challenge' => $challenge,
177                                                  'response' => $response
178                                                  ) + $extra_params
179                                           );
180  
181         $answers = explode ("\n", $response [1]);
182         $recaptcha_response = new ReCaptchaResponse();
183  
184         if (trim ($answers [0]) == 'true') {
185                 $recaptcha_response->is_valid = true;
186         }
187         else {
188                 $recaptcha_response->is_valid = false;
189                 $recaptcha_response->error = $answers [1];
190         }
191         return $recaptcha_response;
192  
193 }
194  
195 /**
196  * gets a URL where the user can sign up for reCAPTCHA. If your application
197  * has a configuration page where you enter a key, you should provide a link
198  * using this function.
199  * @param string $domain The domain where the page is hosted
200  * @param string $appname The name of your application
201  */
202 function recaptcha_get_signup_url ($domain = null, $appname = null) {
203         return "https://www.google.com/recaptcha/admin/create?" .  _recaptcha_qsencode (array ('domains' => $domain, 'app' => $appname));
204 }
205  
206 function _recaptcha_aes_pad($val) {
207         $block_size = 16;
208         $numpad = $block_size - (strlen ($val) % $block_size);
209         return str_pad($val, strlen ($val) + $numpad, chr($numpad));
210 }
211  
212 /* Mailhide related code */
213  
214 function _recaptcha_aes_encrypt($val,$ky) {
215         if (! function_exists ("mcrypt_encrypt")) {
216                 die ("To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed.");
217         }
218         $mode=MCRYPT_MODE_CBC;  
219         $enc=MCRYPT_RIJNDAEL_128;
220         $val=_recaptcha_aes_pad($val);
221         return mcrypt_encrypt($enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
222 }
223  
224  
225 function _recaptcha_mailhide_urlbase64 ($x) {
226         return strtr(base64_encode ($x), '+/', '-_');
227 }
228  
229 /* gets the reCAPTCHA Mailhide url for a given email, public key and private key */
230 function recaptcha_mailhide_url($pubkey, $privkey, $email) {
231         if ($pubkey == '' || $pubkey == null || $privkey == "" || $privkey == null) {
232                 die ("To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " .
233                      "you can do so at <a href='http://www.google.com/recaptcha/mailhide/apikey'>http://www.google.com/recaptcha/mailhide/apikey</a>");
234         }
235  
236  
237         $ky = pack('H*', $privkey);
238         $cryptmail = _recaptcha_aes_encrypt ($email, $ky);
239  
240         return "http://www.google.com/recaptcha/mailhide/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($cryptmail);
241 }
242  
243 /**
244  * gets the parts of the email to expose to the user.
245  * eg, given johndoe@example,com return ["john", "example.com"].
246  * the email is then displayed as john...@example.com
247  */
248 function _recaptcha_mailhide_email_parts ($email) {
249         $arr = preg_split("/@/", $email );
250  
251         if (strlen ($arr[0]) <= 4) {
252                 $arr[0] = substr ($arr[0], 0, 1);
253         } else if (strlen ($arr[0]) <= 6) {
254                 $arr[0] = substr ($arr[0], 0, 3);
255         } else {
256                 $arr[0] = substr ($arr[0], 0, 4);
257         }
258         return $arr;
259 }
260  
261 /**
262  * Gets html to display an email address given a public an private key.
263  * to get a key, go to:
264  *
265  * http://www.google.com/recaptcha/mailhide/apikey
266  */
267 function recaptcha_mailhide_html($pubkey, $privkey, $email) {
268         $emailparts = _recaptcha_mailhide_email_parts ($email);
269         $url = recaptcha_mailhide_url ($pubkey, $privkey, $email);
270  
271         return htmlentities($emailparts[0]) . "<a href='" . htmlentities ($url) .
272                 "' onclick=\"window.open('" . htmlentities ($url) . "', '', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=500,height=300'); return false;\" title=\"Reveal this e-mail address\">...</a>@" . htmlentities ($emailparts [1]);
273  
274 }
275  
276  
277 ?>