master

AphrontFormRecaptchaControl.php
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			<?php

			final class AphrontFormRecaptchaControl extends AphrontFormControl {

			protected function getCustomControlClass() {
			return 'aphront-form-control-recaptcha';
			}

			protected function shouldRender() {
			return self::isRecaptchaEnabled();
			}

			public static function isRecaptchaEnabled() {
			return PhabricatorEnv::getEnvConfig('recaptcha.enabled');
			}

			public static function hasCaptchaResponse(AphrontRequest $request) {
			return $request->getBool('g-recaptcha-response');
			}

			public static function processCaptcha(AphrontRequest $request) {
			if (!self::isRecaptchaEnabled()) {
			return true;
			}

			$uri = 'https://www.google.com/recaptcha/api/siteverify';
			$params = array(
			'secret' => PhabricatorEnv::getEnvConfig('recaptcha.private-key'),
			'response' => $request->getStr('g-recaptcha-response'),
			'remoteip' => $request->getRemoteAddress(),
			);

			list($body) = id(new HTTPSFuture($uri, $params))
			->setMethod('POST')
			->resolvex();

			$json = phutil_json_decode($body);
			return (bool)idx($json, 'success');
			}

			protected function renderInput() {
			$js = 'https://www.google.com/recaptcha/api.js';
			$pubkey = PhabricatorEnv::getEnvConfig('recaptcha.public-key');

			CelerityAPI::getStaticResourceResponse()
			->addContentSecurityPolicyURI('script-src', $js)
			->addContentSecurityPolicyURI('script-src', 'https://www.gstatic.com/')
			->addContentSecurityPolicyURI('frame-src', 'https://www.google.com/');

			return array(
			phutil_tag(
			'div',
			array(
			'class' => 'g-recaptcha',
			'data-sitekey' => $pubkey,
			)),
			phutil_tag(
			'script',
			array(
			'type' => 'text/javascript',
			'src' => $js,
			)),
			);
			}
			}