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| <?php |
| /* |
| * This is a PHP library that handles calling reCAPTCHA. |
| * - Documentation and latest version |
| * http://recaptcha.net/plugins/php/ |
| * - Get a reCAPTCHA API Key |
| * https://www.google.com/recaptcha/admin/create |
| * - Discussion group |
| * http://groups.google.com/group/recaptcha |
| * |
| * Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net |
| * AUTHORS: |
| * Mike Crawford |
| * Ben Maurer |
| * |
| * 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. |
| */ |
| |
| /** |
| * The reCAPTCHA server URL's |
| */ |
| define("RECAPTCHA_API_SERVER", "http://www.google.com/recaptcha/api"); |
| define("RECAPTCHA_API_SECURE_SERVER", "https://www.google.com/recaptcha/api"); |
| define("RECAPTCHA_VERIFY_SERVER", "www.google.com"); |
| |
| /** |
| * Encodes the given data into a query string format |
| * @param $data - array of string elements to be encoded |
| * @return string - encoded request |
| */ |
| function _recaptcha_qsencode ($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 POST to a reCAPTCHA server |
| * @param string $host |
| * @param string $path |
| * @param array $data |
| * @param int port |
| * @return array response |
| */ |
| function _recaptcha_http_post($host, $path, $data, $port = 80) { |
| |
| $req = _recaptcha_qsencode ($data); |
| |
| $http_request = "POST $path HTTP/1.0\r\n"; |
| $http_request .= "Host: $host\r\n"; |
| $http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n"; |
| $http_request .= "Content-Length: " . strlen($req) . "\r\n"; |
| $http_request .= "User-Agent: reCAPTCHA/PHP\r\n"; |
| $http_request .= "\r\n"; |
| $http_request .= $req; |
| |
| $response = ''; |
| if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) { |
| die ('Could not open socket'); |
| } |
| |
| fwrite($fs, $http_request); |
| |
| while ( !feof($fs) ) |
| $response .= fgets($fs, 1160); // One TCP-IP packet |
| fclose($fs); |
| $response = explode("\r\n\r\n", $response, 2); |
| |
| return $response; |
| } |
| |
| |
| |
| /** |
| * Gets the challenge HTML (javascript and non-javascript version). |
| * This is called from the browser, and the resulting reCAPTCHA HTML widget |
| * is embedded within the HTML form it was called from. |
| * @param string $pubkey A public key for reCAPTCHA |
| * @param string $error The error given by reCAPTCHA (optional, default is null) |
| * @param boolean $use_ssl Should the request be made over ssl? (optional, default is false) |
| |
| * @return string - The HTML to be embedded in the user's form. |
| */ |
| function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false) |
| { |
| if ($pubkey == null || $pubkey == '') { |
| die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>"); |
| } |
| |
| if ($use_ssl) { |
| $server = RECAPTCHA_API_SECURE_SERVER; |
| } else { |
| $server = RECAPTCHA_API_SERVER; |
| } |
| |
| $errorpart = ""; |
| if ($error) { |
| $errorpart = "&error=" . $error; |
| } |
| return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script> |
| |
| <noscript> |
| <iframe src="'. $server . '/noscript?k=' . $pubkey . $errorpart . '" height="300" width="500" frameborder="0"></iframe><br/> |
| <textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea> |
| <input type="hidden" name="recaptcha_response_field" value="manual_challenge"/> |
| </noscript>'; |
| } |
| |
| |
| |
| |
| /** |
| * A ReCaptchaResponse is returned from recaptcha_check_answer() |
| */ |
| class ReCaptchaResponse { |
| var $is_valid; |
| var $error; |
| } |
| |
| |
| /** |
| * Calls an HTTP POST function to verify if the user's guess was correct |
| * @param string $privkey |
| * @param string $remoteip |
| * @param string $challenge |
| * @param string $response |
| * @param array $extra_params an array of extra variables to post to the server |
| * @return ReCaptchaResponse |
| */ |
| function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response, $extra_params = array()) |
| { |
| if ($privkey == null || $privkey == '') { |
| die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>"); |
| } |
| |
| if ($remoteip == null || $remoteip == '') { |
| die ("For security reasons, you must pass the remote ip to reCAPTCHA"); |
| } |
| |
| |
| |
| //discard spam submissions |
| if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) { |
| $recaptcha_response = new ReCaptchaResponse(); |
| $recaptcha_response->is_valid = false; |
| $recaptcha_response->error = 'incorrect-captcha-sol'; |
| return $recaptcha_response; |
| } |
| |
| $response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify", |
| array ( |
| 'privatekey' => $privkey, |
| 'remoteip' => $remoteip, |
| 'challenge' => $challenge, |
| 'response' => $response |
| ) + $extra_params |
| ); |
| |
| $answers = explode ("\n", $response [1]); |
| $recaptcha_response = new ReCaptchaResponse(); |
| |
| if (trim ($answers [0]) == 'true') { |
| $recaptcha_response->is_valid = true; |
| } |
| else { |
| $recaptcha_response->is_valid = false; |
| $recaptcha_response->error = $answers [1]; |
| } |
| return $recaptcha_response; |
| |
| } |
| |
| /** |
| * gets a URL where the user can sign up for reCAPTCHA. If your application |
| * has a configuration page where you enter a key, you should provide a link |
| * using this function. |
| * @param string $domain The domain where the page is hosted |
| * @param string $appname The name of your application |
| */ |
| function recaptcha_get_signup_url ($domain = null, $appname = null) { |
| return "https://www.google.com/recaptcha/admin/create?" . _recaptcha_qsencode (array ('domains' => $domain, 'app' => $appname)); |
| } |
| |
| function _recaptcha_aes_pad($val) { |
| $block_size = 16; |
| $numpad = $block_size - (strlen ($val) % $block_size); |
| return str_pad($val, strlen ($val) + $numpad, chr($numpad)); |
| } |
| |
| /* Mailhide related code */ |
| |
| function _recaptcha_aes_encrypt($val,$ky) { |
| if (! function_exists ("mcrypt_encrypt")) { |
| die ("To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed."); |
| } |
| $mode=MCRYPT_MODE_CBC; |
| $enc=MCRYPT_RIJNDAEL_128; |
| $val=_recaptcha_aes_pad($val); |
| return mcrypt_encrypt($enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); |
| } |
| |
| |
| function _recaptcha_mailhide_urlbase64 ($x) { |
| return strtr(base64_encode ($x), '+/', '-_'); |
| } |
| |
| /* gets the reCAPTCHA Mailhide url for a given email, public key and private key */ |
| function recaptcha_mailhide_url($pubkey, $privkey, $email) { |
| if ($pubkey == '' || $pubkey == null || $privkey == "" || $privkey == null) { |
| die ("To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " . |
| "you can do so at <a href='http://www.google.com/recaptcha/mailhide/apikey'>http://www.google.com/recaptcha/mailhide/apikey</a>"); |
| } |
| |
| |
| $ky = pack('H*', $privkey); |
| $cryptmail = _recaptcha_aes_encrypt ($email, $ky); |
| |
| return "http://www.google.com/recaptcha/mailhide/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($cryptmail); |
| } |
| |
| /** |
| * gets the parts of the email to expose to the user. |
| * eg, given johndoe@example,com return ["john", "example.com"]. |
| * the email is then displayed as john...@example.com |
| */ |
| function _recaptcha_mailhide_email_parts ($email) { |
| $arr = preg_split("/@/", $email ); |
| |
| if (strlen ($arr[0]) <= 4) { |
| $arr[0] = substr ($arr[0], 0, 1); |
| } else if (strlen ($arr[0]) <= 6) { |
| $arr[0] = substr ($arr[0], 0, 3); |
| } else { |
| $arr[0] = substr ($arr[0], 0, 4); |
| } |
| return $arr; |
| } |
| |
| /** |
| * Gets html to display an email address given a public an private key. |
| * to get a key, go to: |
| * |
| * http://www.google.com/recaptcha/mailhide/apikey |
| */ |
| function recaptcha_mailhide_html($pubkey, $privkey, $email) { |
| $emailparts = _recaptcha_mailhide_email_parts ($email); |
| $url = recaptcha_mailhide_url ($pubkey, $privkey, $email); |
| |
| return htmlentities($emailparts[0]) . "<a href='" . htmlentities ($url) . |
| "' onclick=\"window.open('" . htmlentities ($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]); |
| |
| } |
| |
| |
| ?> |