Current File : //proc/985914/root/www/varak.net/wiki.varak.net/extensions/ConfirmEdit/ReCaptcha/recaptchalib.php
<?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 {
public $is_valid;
public $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 );
} elseif ( 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] );
}
Mini Shell