277 lines
9.6 KiB
PHP
277 lines
9.6 KiB
PHP
<?php
|
|
/*
|
|
* @todo FIXME: Outdated URLs.
|
|
*
|
|
* 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("RECAPTCHA_API_SERVER", "http://api.recaptcha.net");
|
|
define("RECAPTCHA_API_SECURE_SERVER", "https://api-secure.recaptcha.net");
|
|
define("RECAPTCHA_VERIFY_SERVER", "api-verify.recaptcha.net");
|
|
|
|
/**
|
|
* 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 || $pubkey == '') {
|
|
die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
|
|
}
|
|
|
|
if ($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 {
|
|
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 || $privkey == '') {
|
|
die ("To use reCAPTCHA you must get an API key from <a href='http://recaptcha.net/api/getkey'>http://recaptcha.net/api/getkey</a>");
|
|
}
|
|
|
|
if ($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, "/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 "http://recaptcha.net/api/getkey?" . _recaptcha_qsencode (array ('domain' => $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://mailhide.recaptcha.net/apikey'>http://mailhide.recaptcha.net/apikey</a>");
|
|
}
|
|
|
|
|
|
$ky = pack('H*', $privkey);
|
|
$cryptmail = _recaptcha_aes_encrypt ($email, $ky);
|
|
|
|
return "http://mailhide.recaptcha.net/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 $arr;
|
|
}
|
|
|
|
/**
|
|
* Gets html to display an email address given a public an private key.
|
|
* to get a key, go to:
|
|
*
|
|
* http://mailhide.recaptcha.net/apikey
|
|
*/
|
|
function recaptcha_mailhide_html($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]);
|
|
|
|
}
|