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<?php
// no direct access
defined('_JEXEC') or die('Restricted access');
/*
* 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
*/
/* old URLs
define("RSFP_RECAPTCHA_API_SERVER", "http://api.recaptcha.net");
define("RSFP_RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");
define("RSFP_RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");
*/
define("RSFP_RECAPTCHA_API_SERVER", "http://www.google.com/recaptcha/api");
define("RSFP_RECAPTCHA_API_SECURE_SERVER", "https://www.google.com/recaptcha/api");
define("RSFP_RECAPTCHA_VERIFY_SERVER", "www.google.com");
/**
* Encodes the given data into a query string format
* @param $data - array of string elements to be encoded
* @return string - encoded request
*/
function rsform_recaptcha_qsencode ($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 $data
* @param int port
* @return array response
*/
function rsform_recaptcha_http_post($host, $path, $data, $port = 80) {
$req = rsform_recaptcha_qsencode ($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 $use_ssl Should the request be made over ssl? (optional, default is false)
* @return string - The HTML to be embedded in the user's form.
*/
function rsform_recaptcha_get_html ($pubkey, $error = null, $use_ssl = false)
{
if ($pubkey == null || $pubkey == '') {
echo "To use reCAPTCHA you must get an API key from <a href='http://www.google.com/recaptcha/whyrecaptcha'>http://www.google.com/recaptcha/whyrecaptcha</a>";
}
if ($use_ssl) {
$server = RSFP_RECAPTCHA_API_SECURE_SERVER;
} else {
$server = RSFP_RECAPTCHA_API_SERVER;
}
$errorpart = "";
if ($error) {
$errorpart = "&error=" . $error;
}
$lang = JFactory::getLanguage();
$tag = $lang->getTag();
$langpart = '&hl='.$tag;
return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $langpart . $errorpart . '"></script>
<noscript>
<iframe src="'. $server . '/noscript?k=' . $pubkey . $langpart . $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 RSForm_ReCaptchaResponse is returned from recaptcha_check_answer()
*/
class RSForm_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 $extra_params an array of extra variables to post to the server
* @return RSForm_ReCaptchaResponse
*/
function rsform_recaptcha_check_answer ($privkey, $remoteip, $challenge, $response, $extra_params = array())
{
if ($privkey == null || $privkey == '') {
echo "To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>";
}
if ($remoteip == null || $remoteip == '') {
echo "For security reasons, you must pass the remote ip to reCAPTCHA";
}
//discard spam submissions
if ($challenge == null || strlen($challenge) == 0 || $response == null || strlen($response) == 0) {
$recaptcha_response = new RSForm_ReCaptchaResponse();
$recaptcha_response->is_valid = false;
$recaptcha_response->error = 'incorrect-captcha-sol';
return $recaptcha_response;
}
$response = rsform_recaptcha_http_post (RSFP_RECAPTCHA_VERIFY_SERVER, "/recaptcha/api/verify",
array (
'privatekey' => $privkey,
'remoteip' => $remoteip,
'challenge' => $challenge,
'response' => $response
) + $extra_params
);
$answers = explode ("\n", $response [1]);
$recaptcha_response = new RSForm_ReCaptchaResponse();
if (trim ($answers [0]) == 'true') {
$recaptcha_response->is_valid = true;
}
else {
$recaptcha_response->is_valid = false;
$recaptcha_response->error = $answers [1];
}
return $recaptcha_response;
}