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By: a guest on Feb 1st, 2010  |  syntax: PHP  |  size: 10.11 KB  |  views: 98  |  expires: Never
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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.  *          http://recaptcha.net/api/getkey
  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://api.recaptcha.net");
  39. define("RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");
  40. define("RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");
  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 || $pubkey == '') {
  109.                 die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
  110.         }
  111.        
  112.         if ($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 || $privkey == '') {
  155.                 die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
  156.         }
  157.  
  158.         if ($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, "/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 "http://recaptcha.net/api/getkey?" .  _recaptcha_qsencode (array ('domain' => $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://mailhide.recaptcha.net/apikey'>http://mailhide.recaptcha.net/apikey</a>");
  234.         }
  235.        
  236.  
  237.         $ky = pack('H*', $privkey);
  238.         $cryptmail = _recaptcha_aes_encrypt ($email, $ky);
  239.        
  240.         return "http://mailhide.recaptcha.net/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 $arr;
  259. }
  260.  
  261. /**
  262.  * Gets html to display an email address given a public an private key.
  263.  * to get a key, go to:
  264.  *
  265.  * http://mailhide.recaptcha.net/apikey
  266.  */
  267. function recaptcha_mailhide_html($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. function recaptcha()
  277. {
  278.     $CI =& get_instance();
  279.     $CI->config->load('recaptcha');
  280.     $public_key = $CI->config->item('recaptcha_public_key');
  281.     $message = isset($CI->validation->recaptcha_error)
  282.              ? $CI->validation->recaptcha_error : '';
  283.     return recaptcha_get_html($public_key, $message);
  284. }
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