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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2008 Bharat Mediratta
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
*/
class recaptcha_Core {
/**
* The reCAPTCHA server URL"s
*/
const API_SERVER = "http://api.recaptcha.net";
const API_SECURE_SERVER = "https://api-secure.recaptcha.net";
const VERIFY_SERVER = "api-verify.recaptcha.net";
/**
* RecaptchaOptions
*/
private $options = array();
static function get_configure_form() {
$form = new Forge("admin/recaptcha", "", "post", array("id" => "gConfigureRecaptchaForm"));
$group = $form->group("configure_recaptcha")
->label(t("Configure Recaptcha"));
$group->hidden("orig_public_key")
->value(module::get_var());
$group->input("public_key")
->label(t("Public Key"))
->value(module::get_var("recaptcha", "public_key"))
->rules("required|length[40]");
$group->public_key->error_messages("invalid", t("The public key you provided is invalid."));
$group->input("private_key")
->label(t("Private Key"))
->value(module::get_var("recaptcha", "private_key"))
->rules("required|length[40]");
$group->private_key->error_messages("invalid", t("The private key you provided is invalid."));
$forms_list = self::_get_form_list();
$group->checklist("activated_forms")
->label(t("Recaptcha Activated on:"))
->options($forms_list);
$group->submit("")->value(t("Save"));
$site_domain = urlencode(stripslashes($_SERVER["HTTP_HOST"]));
$form->recaptcha_site = self::API_SERVER;
$form->recaptcha_ssl_site = self::API_SECURE_SERVER;
$form->get_key_url = "http://recaptcha.net/api/getkey?domain=$site_domain&app=Gallery3";
return $form;
}
static function check_config() {
$public_key = module::get_var("recaptcha", "public_key");
$private_key = module::get_var("recaptcha", "private_key");
if (empty($public_key) || empty($private_key)) {
site_status::warning(
t("Recaptcha is not quite ready! Please configure the <a href=\"%url\">Recaptcha Keys</a>",
array("url" => url::site("admin/recaptcha"))),
"recaptcha_config");
} else {
site_status::clear("recaptcha_config");
}
}
/**
* 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 The public key to use in the challenge
* @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)
* @param string $lang Any supported language code
* @return string - The HTML to be embedded in the user"s form.
*/
static function get_challenge_html($pubkey, $error = NULL, $use_ssl = false) {
if (empty($pubkey)) {
throw new Exception("@todo NEED KEY <a href=\"http://recaptcha.net/api/getkey\">" .
"http://recaptcha.net/api/getkey</a>");
}
$lang = Kohana::config("locale.root_locale");
$server = $use_ssl ? self::API_SECURE_SERVER : self::API_SERVER;
$errorpart = "";
if ($error) {
$errorpart = "&error=". $error;
}
return (count(self::$options) > 0 ? "<script type=\"text/javascript\">" .
"var RecaptchaOptions = {lang:'$lang'};</script>" : "") .
"<script type=\"text/javascript\" src=\"$server/challenge?k=" .
"{$pubkey}$errorpart \"></script>" . $noscript;
}
/**
* Form validation call back for captcha validation
* @param string $form
* @return true if valid, false if not
*/
static function is_recaptcha_valid($form, $private_key=null) {
$input = Input::instance();
if (empty($private_key)) {
$private_key = module::get_var("recaptcha", "private_key");
}
$remoteip = $_SERVER["REMOTE_ADDR"] ;
$challenge = $input->post("recaptcha_challenge_field", "", true);
$response = $input->post("recaptcha_response_field", "", true);
//discard spam submissions
if (empty($challenge) || empty($response)) {
$form->captcha_error = "incorrect-captcha-sol";
return false;
}
$response = self::_http_post(self::VERIFY_SERVER, "/verify",
array ("privatekey" => $private_key,
"remoteip" => $remoteip,
"challenge" => $challenge,
"response" => $response));
$answers = explode ("\n", $response [1]);
if (trim ($answers [0]) == "true") {
return true;
} else {
$form->captcha_error = $answers[1];
Kohana::log("debug", print_r($answers, 1));
return false;
}
}
/**
* Encodes the given data into a query string format
* @param $data - array of string elements to be encoded
* @return string - encoded request
*/
private static function _encode(array $data){
$req = array();
foreach ($data as $key => $value){
$req[] = "$key=" . urlencode(stripslashes($value));
}
return implode("&", $req);
}
/**
* Submits an HTTP POST to a reCAPTCHA server
* @param string $host
* @param string $path
* @param array $data
* @param int port
* @return array response
*/
private static function _http_post($host, $path, $data, $port = 80) {
$req = self::_encode($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, $errstr, 10) ) ) {
throw new Exception("@todo COULD NOT OPEN SOCKET");
}
fwrite($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;
}
function _get_form_list() {
$forms = unserialize(module::get_var("recaptcha", "form_list", "a:0:{}"));
Kohana::log("debug", print_r($forms, 1));
$form_list = array();
// @todo Ignore administrative forms
foreach (array_merge(glob(APPPATH . "helpers/*"), glob(MODPATH . "*/helpers/*")) as $path) {
if (preg_match("#.*/(.*)/helpers/(.*).*\.php$#", $path, $matches)) {
Kohana::log("debug", "$path => $matches[1]");
if ("recaptcha" == $matches[1]) {
continue;
}
$content = file_get_contents($path);
$preg_match_all = preg_match_all("#.*\"(g([A-Za-z]*)Form)\"#m",
$content, $matches, PREG_SET_ORDER);
if ($preg_match_all !== false) {
foreach ($matches as $match) {
$label = trim(preg_replace("/([A-Z])/", " $1", $match[2]));
$form_id = $match[1];
$form_list[$form_id] = array($label, !empty($forms[$form_id]));
}
}
}
}
return $form_list;
}
}
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