XOOPS 2.5.6  Final
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recaptchalib.php
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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 
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 
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 $req;
55 }
56 
57 
58 
67 function _recaptcha_http_post($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 $response;
92 }
93 
94 
95 
106 function recaptcha_get_html ($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 
139  var $error;
140 }
141 
142 
152 function recaptcha_check_answer ($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 $recaptcha_response;
192 
193 }
194 
202 function recaptcha_get_signup_url ($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, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0");
222 }
223 
224 
226  return strtr(base64_encode ($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 
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 $arr;
259 }
260 
267 function recaptcha_mailhide_html($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 ?>