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File: FormValidatorReCaptcha.inc.php
<?php

/**
 * @file classes/form/validation/FormValidatorReCaptcha.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class FormValidatorReCaptcha
 * @ingroup form_validation
 *
 * @brief Form validation check reCaptcha values.
 */

define('RECAPTCHA_RESPONSE_FIELD', 'g-recaptcha-response');
define('RECAPTCHA_HOST', 'https://www.recaptcha.net');
define("RECAPTCHA_PATH", "/recaptcha/api/siteverify");

class FormValidatorReCaptcha extends FormValidator {
	/** @var string The initiating IP address of the user */
	var $_userIp;
	/** @var string The hostname to expect in the validation response */
	var $_hostname;

	/**
	 * Constructor.
	 * @param $form object
	 * @param $userIp string IP address of user request
	 * @param $message string Key of message to display on mismatch
	 * @param $hostname string Hostname to expect in validation response
	 */
	function __construct(&$form, $userIp, $message, $hostname = '') {
		parent::__construct($form, RECAPTCHA_RESPONSE_FIELD, FORM_VALIDATOR_REQUIRED_VALUE, $message);
		$this->_userIp = $userIp;
		$this->_hostname = $hostname;
	}


	//
	// Public methods
	//
	/**
	 * @see FormValidator::isValid()
	 * Determine whether or not the form meets this ReCaptcha constraint.
	 * @return boolean
	 */
	function isValid() {

		$privateKey = Config::getVar('captcha', 'recaptcha_private_key');
		if (is_null($privateKey) || empty($privateKey)) {
			return false;
		}

		if (is_null($this->_userIp) || empty($this->_userIp)) {
			return false;
		}

		$form =& $this->getForm();

		// Request response from recaptcha api
		$httpClient = Application::get()->getHttpClient();
		$response = $httpClient->request(
			'POST',
			RECAPTCHA_HOST . RECAPTCHA_PATH,
			[
				'multipart' => [
					['name' => 'secret', 'contents' => $privateKey],
					['name' => 'response', 'contents' => $form->getData(RECAPTCHA_RESPONSE_FIELD)],
					['name' => 'remoteip', 'contents' => $this->_userIp]
				]
			]
		);
		$response = json_decode($response->getBody(), true);

		// Unrecognizable response from Google server
		if (isset($response['success']) && $response['success'] === true) {
			if (Config::getVar('captcha', 'recaptcha_enforce_hostname') && $response['hostname'] !== $this->_hostname) {
				$this->_message = 'common.captcha.error.invalid-input-response';
				return false;
			}
			return true;
		} else {
			if (isset($response['error-codes']) && is_array($response['error-codes'])) {
				$this->_message = 'common.captcha.error.' . $response['error-codes'][0];
			}
			return false;
		}

	}
}