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<?php |
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/* |
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* This is a PHP library that handles calling reCAPTCHA. |
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* - Documentation and latest version |
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* http://recaptcha.net/plugins/php/ |
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* - Get a reCAPTCHA API Key |
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* https://www.google.com/recaptcha/admin/create |
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* - Discussion group |
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* http://groups.google.com/group/recaptcha |
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* |
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* Copyright (c) 2007 reCAPTCHA -- http://recaptcha.net |
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* AUTHORS: |
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* Mike Crawford |
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* Ben Maurer |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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|
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/** |
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* The reCAPTCHA server URL's |
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*/ |
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define("RECAPTCHA_API_SERVER", "http://www.recaptcha.net/recaptcha/api"); |
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define("RECAPTCHA_API_SECURE_SERVER", "https://www.recaptcha.net/recaptcha/api"); |
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define("RECAPTCHA_VERIFY_SERVER", "www.recaptcha.net"); |
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|
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/** |
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* Encodes the given data into a query string format |
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* @param $data - array of string elements to be encoded |
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* @return string - encoded request |
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*/ |
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function _recaptcha_qsencode ($data) { |
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$req = ""; |
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foreach ( $data as $key => $value ) |
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$req .= $key . '=' . urlencode( stripslashes($value) ) . '&'; |
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|
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// Cut the last '&' |
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$req=substr($req,0,strlen($req)-1); |
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return $req; |
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} |
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|
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|
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|
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/** |
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* Submits an HTTP POST to a reCAPTCHA server |
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* @param string $host |
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* @param string $path |
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* @param array $data |
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* @param int port |
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* @return array response |
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*/ |
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function _recaptcha_http_post($host, $path, $data, $port = 80) { |
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|
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$req = _recaptcha_qsencode ($data); |
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|
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$http_request = "POST $path HTTP/1.0\r\n"; |
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$http_request .= "Host: $host\r\n"; |
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$http_request .= "Content-Type: application/x-www-form-urlencoded;\r\n"; |
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$http_request .= "Content-Length: " . strlen($req) . "\r\n"; |
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$http_request .= "User-Agent: reCAPTCHA/PHP\r\n"; |
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$http_request .= "\r\n"; |
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$http_request .= $req; |
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|
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$response = ''; |
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if( false == ( $fs = @fsockopen($host, $port, $errno, $errstr, 10) ) ) { |
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die ('Could not open socket'); |
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} |
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|
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fwrite($fs, $http_request); |
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|
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while ( !feof($fs) ) |
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$response .= fgets($fs, 1160); // One TCP-IP packet |
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fclose($fs); |
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$response = explode("\r\n\r\n", $response, 2); |
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|
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return $response; |
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} |
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|
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|
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|
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/** |
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* Gets the challenge HTML (javascript and non-javascript version). |
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* This is called from the browser, and the resulting reCAPTCHA HTML widget |
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* is embedded within the HTML form it was called from. |
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* @param string $pubkey A public key for reCAPTCHA |
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* @param string $error The error given by reCAPTCHA (optional, default is null) |
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* @param boolean $use_ssl Should the request be made over ssl? (optional, default is false) |
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|
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* @return string - The HTML to be embedded in the user's form. |
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*/ |
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function recaptcha_get_html ($pubkey, $error = null, $use_ssl = false) |
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{ |
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if ($pubkey == null || $pubkey == '') { |
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die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>"); |
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} |
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|
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if ($use_ssl) { |
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$server = RECAPTCHA_API_SECURE_SERVER; |
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} else { |
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$server = RECAPTCHA_API_SERVER; |
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} |
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|
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$errorpart = ""; |
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if ($error) { |
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$errorpart = "&error=" . $error; |
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} |
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return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script> |
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|
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<noscript> |
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<iframe src="'. $server . '/noscript?k=' . $pubkey . $errorpart . '" height="300" width="500" frameborder="0"></iframe><br/> |
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<textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea> |
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<input type="hidden" name="recaptcha_response_field" value="manual_challenge"/> |
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</noscript>'; |
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} |
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|
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|
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|
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|
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/** |
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* A ReCaptchaResponse is returned from recaptcha_check_answer() |
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*/ |
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class ReCaptchaResponse { |
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var $is_valid; |
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var $error; |
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} |
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|
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|
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/** |
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* Calls an HTTP POST function to verify if the user's guess was correct |
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* @param string $privkey |
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* @param string $remoteip |
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* @param string $challenge |
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* @param string $response |
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* @param array $extra_params an array of extra variables to post to the server |
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* @return ReCaptchaResponse |
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*/ |
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function recaptcha_check_answer ($privkey, $remoteip, $challenge, $response, $extra_params = array()) |
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{ |
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if ($privkey == null || $privkey == '') { |
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die ("To use reCAPTCHA you must get an API key from <a href='https://www.google.com/recaptcha/admin/create'>https://www.google.com/recaptcha/admin/create</a>"); |
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} |
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|
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if ($remoteip == null || $remoteip == '') { |
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die ("For security reasons, you must pass the remote ip to reCAPTCHA"); |
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} |
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|
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|
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|
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//discard spam submissions |
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if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) { |
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$recaptcha_response = new ReCaptchaResponse(); |
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$recaptcha_response->is_valid = false; |
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$recaptcha_response->error = 'incorrect-captcha-sol'; |
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return $recaptcha_response; |
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} |
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|
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$response = _recaptcha_http_post (RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify", |
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array ( |
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'privatekey' => $privkey, |
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'remoteip' => $remoteip, |
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'challenge' => $challenge, |
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'response' => $response |
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) + $extra_params |
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); |
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|
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$answers = explode ("\n", $response [1]); |
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$recaptcha_response = new ReCaptchaResponse(); |
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|
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if (trim ($answers [0]) == 'true') { |
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$recaptcha_response->is_valid = true; |
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} |
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else { |
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$recaptcha_response->is_valid = false; |
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$recaptcha_response->error = $answers [1]; |
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} |
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return $recaptcha_response; |
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|
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} |
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|
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/** |
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* gets a URL where the user can sign up for reCAPTCHA. If your application |
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* has a configuration page where you enter a key, you should provide a link |
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* using this function. |
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* @param string $domain The domain where the page is hosted |
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* @param string $appname The name of your application |
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*/ |
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function recaptcha_get_signup_url ($domain = null, $appname = null) { |
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return "https://www.google.com/recaptcha/admin/create?" . _recaptcha_qsencode (array ('domains' => $domain, 'app' => $appname)); |
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} |
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|
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function _recaptcha_aes_pad($val) { |
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$block_size = 16; |
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$numpad = $block_size - (strlen ($val) % $block_size); |
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return str_pad($val, strlen ($val) + $numpad, chr($numpad)); |
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} |
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|
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/* Mailhide related code */ |
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|
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function _recaptcha_aes_encrypt($val,$ky) { |
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if (! function_exists ("mcrypt_encrypt")) { |
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die ("To use reCAPTCHA Mailhide, you need to have the mcrypt php module installed."); |
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} |
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//$mode=MCRYPT_MODE_CBC; |
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//$enc=MCRYPT_RIJNDAEL_128; |
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//$val=_recaptcha_aes_pad($val); |
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//return mcrypt_encrypt($enc, $ky, $val, $mode, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); |
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|
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if (!class_exists('Crypt_Rijndael')) { |
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require_once(ACCUA_FORMS_DIR_URL . '/phpseclib-crypt/Rijndael.php'); |
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} |
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$cipher = new Crypt_Rijndael(CRYPT_MODE_CBC); |
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$cipher->setBlockLength(128); |
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$cipher->setKey($ky); |
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$cipher->setIV("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"); |
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$val=_recaptcha_aes_pad($val); |
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return $cipher->encrypt($val); |
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} |
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|
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|
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function _recaptcha_mailhide_urlbase64 ($x) { |
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return strtr(base64_encode ($x), '+/', '-_'); |
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} |
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|
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/* gets the reCAPTCHA Mailhide url for a given email, public key and private key */ |
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function recaptcha_mailhide_url($pubkey, $privkey, $email) { |
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if ($pubkey == '' || $pubkey == null || $privkey == "" || $privkey == null) { |
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die ("To use reCAPTCHA Mailhide, you have to sign up for a public and private key, " . |
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"you can do so at <a href='http://www.google.com/recaptcha/mailhide/apikey'>http://www.google.com/recaptcha/mailhide/apikey</a>"); |
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} |
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|
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|
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$ky = pack('H*', $privkey); |
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$cryptmail = _recaptcha_aes_encrypt ($email, $ky); |
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|
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return "http://www.google.com/recaptcha/mailhide/d?k=" . $pubkey . "&c=" . _recaptcha_mailhide_urlbase64 ($cryptmail); |
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} |
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|
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/** |
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* gets the parts of the email to expose to the user. |
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* eg, given johndoe@example,com return ["john", "example.com"]. |
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* the email is then displayed as john...@example.com |
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*/ |
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function _recaptcha_mailhide_email_parts ($email) { |
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$arr = preg_split("/@/", $email ); |
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|
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if (strlen ($arr[0]) <= 4) { |
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$arr[0] = substr ($arr[0], 0, 1); |
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} else if (strlen ($arr[0]) <= 6) { |
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$arr[0] = substr ($arr[0], 0, 3); |
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} else { |
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$arr[0] = substr ($arr[0], 0, 4); |
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} |
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return $arr; |
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} |
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|
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/** |
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* Gets html to display an email address given a public an private key. |
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* to get a key, go to: |
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* |
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* http://www.google.com/recaptcha/mailhide/apikey |
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*/ |
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function recaptcha_mailhide_html($pubkey, $privkey, $email) { |
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$emailparts = _recaptcha_mailhide_email_parts ($email); |
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$url = recaptcha_mailhide_url ($pubkey, $privkey, $email); |
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|
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return htmlentities($emailparts[0]) . "<a href='" . htmlentities ($url) . |
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"' onclick=\"window.open('" . htmlentities ($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]); |
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|
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} |
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|
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|
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?> |
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|
