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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 * http://recaptcha.net/api/getkey * - 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("COM_RSMEMBERSHIP_RECAPTCHA_API_SERVER", "http://www.google.com/recaptcha/api"); define("COM_RSMEMBERSHIP_RECAPTCHA_API_SECURE_SERVER", "https://www.google.com/recaptcha/api"); define("COM_RSMEMBERSHIP_RECAPTCHA_VERIFY_SERVER", "www.google.com"); class JReCAPTCHA { /* * Encodes the given data into a query string format * @param $data - array of string elements to be encoded * @return string - encoded request / static function qsencode ($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 $data * @param int port * @return array response / static function post($host, $path, $data, $port = 80) { $req = JReCAPTCHA::qsencode ($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, $errstr, 10) ) ) { JFactory::getApplication()->enqueueMessage('RSTickets! Pro ReCAPTCHA: Could not open socket. Please check that your server can connect to '.$host, 'warning'); return false; } 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 $use_ssl Should the request be made over ssl? (optional, default is false) * @return string - The HTML to be embedded in the user's form. / static function getHTML ($error = null, $use_ssl = false) { $pubkey = RSMembershipHelper::getConfig('recaptcha_public_key'); if ($pubkey == null \|\| $pubkey == '') { return "To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>"; } $return = ' <script type="text/javascript">var RecaptchaOptions = { theme : \''.RSMembershipHelper::getConfig('recaptcha_theme').'\' };</script>'; $use_ssl = ((isset($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] == 'on')) \|\| getenv('SSL_PROTOCOL_VERSION')); if ($use_ssl) $server = COM_RSMEMBERSHIP_RECAPTCHA_API_SECURE_SERVER; else $server = COM_RSMEMBERSHIP_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>'; return $return; } /* * 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 $extra_params an array of extra variables to post to the server * @return ReCaptchaResponse / static function checkAnswer ($privkey, $remoteip, $challenge, $response, $extra_params = array()) { if ($privkey == null \|\| $privkey == '') { JFactory::getApplication()->enqueueMessage('To use reCAPTCHA you must get an API key from <a href="http://recaptcha.net/api/getkey">http://recaptcha.net/api/getkey</a>', 'warning'); return false; } if ($remoteip == null \|\| $remoteip == '') { JFactory::getApplication()->enqueueMessage('For security reasons, you must pass the remote IP to reCAPTCHA. We could not detect your IP.', 'warning'); return false; } //discard spam submissions if ($challenge == null \|\| strlen($challenge) == 0 \|\| $response == null \|\| strlen($response) == 0) { $recaptcha_response = new JReCAPTCHAResponse(); $recaptcha_response->is_valid = false; $recaptcha_response->error = 'incorrect-captcha-sol'; return $recaptcha_response; } $response = JReCAPTCHA::post (COM_RSMEMBERSHIP_RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify", array ( 'privatekey' => $privkey, 'remoteip' => $remoteip, 'challenge' => $challenge, 'response' => $response ) + $extra_params ); $answers = explode ("\n", $response [1]); $recaptcha_response = new JReCAPTCHAResponse(); if (trim ($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 $appname The name of your application / function get_signup_url ($domain = null, $appname = null) { return "http://recaptcha.net/api/getkey?" . JReCAPTCHA::qsencode (array ('domain' => $domain, 'app' => $appname)); } } /* * A JReCAPTCHAResponse is returned from recaptcha_check_answer() */ class JReCAPTCHAResponse { var $is_valid; var $error; }

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