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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 https://www.google.com/recaptcha/admin/create"); }

if ($use_ssl) { $server = RECAPTCHA_API_SECURE_SERVER; } else { $server = RECAPTCHA_API_SERVER; }
```
$errorpart = "";
if ($error) {
   $errorpart = "&amp;error=" . $error;
}
return '<script type="text/javascript" src="'. $server . '/challenge?k=' . $pubkey . $errorpart . '"></script>
```
'; }

/**

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 https://www.google.com/recaptcha/admin/create"); }

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 ($x) { return strtr(base64encode ($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 http://www.google.com/recaptcha/mailhide/apikey"); }

$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 ($url) . "', '', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=500,height=300'); return false;\" title=\"Reveal this e-mail address\">...@" . htmlentities ($emailparts [1]);

}

?> `

greggilbert / recaptcha

Yardım Lütfen #168