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<?php // This file is part of Moodle - http://moodle.org/ // // Moodle 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 3 of the License, or // (at your option) any later version. // // Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>. // This file is part of Moodle - http://moodle.org/ // // Moodle 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 3 of the License, or // (at your option) any later version. // // Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>. /** * This is a PHP library that handles calling reCAPTCHA v2. * * - Documentation * {@link https://developers.google.com/recaptcha/docs/display} * - Get a reCAPTCHA API Key * {@link https://www.google.com/recaptcha/admin} * - Discussion group * {@link http://groups.google.com/group/recaptcha} * * @package core * @copyright 2018 Jeff Webster * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ defined('MOODLE_INTERNAL') || die(); /** * The reCAPTCHA URL's */ define('RECAPTCHA_API_URL', 'https://www.recaptcha.net/recaptcha/api.js'); define('RECAPTCHA_VERIFY_URL', 'https://www.recaptcha.net/recaptcha/api/siteverify'); /** * Returns the language code the reCAPTCHA element should use. * Google reCAPTCHA uses different language codes than Moodle so we must convert. * https://developers.google.com/recaptcha/docs/language * * @param string $lang Language to use. If not provided, get current language. * @return string A language code */ function recaptcha_lang($lang = null) { if (empty($lang)) { $lang = current_language(); } $glang = $lang; switch ($glang) { case 'en': $glang = 'en-GB'; break; case 'en_us': $glang = 'en'; break; case 'zh_cn': $glang = 'zh-CN'; break; case 'zh_tw': $glang = 'zh-TW'; break; case 'fr_ca': $glang = 'fr-CA'; break; case 'pt_br': $glang = 'pt-BR'; break; case 'he': $glang = 'iw'; break; } // For any language code that didn't change reduce down to the base language. if (($lang === $glang) and (strpos($lang, '_') !== false)) { list($glang, $trash) = explode('_', $lang, 2); } return $glang; } /** * Gets the challenge HTML * This is called from the browser, and the resulting reCAPTCHA HTML widget * is embedded within the HTML form it was called from. * * @param string $apiurl URL for reCAPTCHA API * @param string $pubkey The public key for reCAPTCHA * @param string $lang Language to use. If not provided, get current language. * @return string - The HTML to be embedded in the user's form. */ function recaptcha_get_challenge_html($apiurl, $pubkey, $lang = null) { global $CFG, $PAGE; // To use reCAPTCHA you must have an API key. if ($pubkey === null || $pubkey === '') { return get_string('getrecaptchaapi', 'auth'); } $jscode = " var recaptchacallback = function() { grecaptcha.render('recaptcha_element', { 'sitekey' : '$pubkey' }); }"; $lang = recaptcha_lang($lang); $apicode = "\n<script type=\"text/javascript\" "; $apicode .= "src=\"$apiurl?onload=recaptchacallback&render=explicit&hl=$lang\" async defer>"; $apicode .= "</script>\n"; $return = html_writer::script($jscode, ''); $return .= html_writer::div('', 'recaptcha_element', array('id' => 'recaptcha_element')); $return .= $apicode; return $return; } /** * Calls an HTTP POST function to verify if the user's response was correct * * @param string $verifyurl URL for reCAPTCHA verification * @param string $privkey The private key for reCAPTCHA * @param string $remoteip The user's IP * @param string $response The response from reCAPTCHA * @return ReCaptchaResponse */ function recaptcha_check_response($verifyurl, $privkey, $remoteip, $response) { global $CFG; require_once($CFG->libdir.'/filelib.php'); // Check response - isvalid boolean, error string. $checkresponse = array('isvalid' => false, 'error' => 'check-not-started'); // To use reCAPTCHA you must have an API key. if ($privkey === null || $privkey === '') { $checkresponse['isvalid'] = false; $checkresponse['error'] = 'no-apikey'; return $checkresponse; } // For security reasons, you must pass the remote ip to reCAPTCHA. if ($remoteip === null || $remoteip === '') { $checkresponse['isvalid'] = false; $checkresponse['error'] = 'no-remoteip'; return $checkresponse; } // Discard spam submissions. if ($response === null || strlen($response) === 0) { $checkresponse['isvalid'] = false; $checkresponse['error'] = 'incorrect-captcha-sol'; return $checkresponse; } $params = array('secret' => $privkey, 'remoteip' => $remoteip, 'response' => $response); $curl = new curl(); $curlresponse = $curl->post($verifyurl, $params); if ($curl->get_errno() === 0) { $curldata = json_decode($curlresponse); if (isset($curldata->success) && $curldata->success === true) { $checkresponse['isvalid'] = true; $checkresponse['error'] = ''; } else { $checkresponse['isvalid'] = false; $checkresponse['error'] = $curldata->{error-codes}; } } else { $checkresponse['isvalid'] = false; $checkresponse['error'] = 'check-failed'; } return $checkresponse; }