From 317f8fa73f55527cb3df228f36950ea7315da7d4 Mon Sep 17 00:00:00 2001
From: Jakob Ackermann <jakob.ackermann@overleaf.com>
Date: Wed, 15 Sep 2021 10:43:04 +0200
Subject: [PATCH] Merge pull request #5115 from
 overleaf/jpa-recaptcha-detection

[web] form-helpers/captcha: step up detection of loaded recaptcha

GitOrigin-RevId: d9ed3b99277ffcdca68df9f8e0b162faeb363451
---
 .../web/frontend/js/features/form-helpers/captcha.js     | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/services/web/frontend/js/features/form-helpers/captcha.js b/services/web/frontend/js/features/form-helpers/captcha.js
index ed7f362268..1cce6ead31 100644
--- a/services/web/frontend/js/features/form-helpers/captcha.js
+++ b/services/web/frontend/js/features/form-helpers/captcha.js
@@ -4,7 +4,14 @@ let recaptchaId
 const recaptchaCallbacks = []
 
 export async function validateCaptchaV2() {
-  if (typeof grecaptcha === 'undefined') {
+  if (
+    // Detect blocked recaptcha
+    typeof grecaptcha === 'undefined' ||
+    // Detect stubbed recaptcha
+    typeof grecaptcha.render !== 'function' ||
+    typeof grecaptcha.execute !== 'function' ||
+    typeof grecaptcha.reset !== 'function'
+  ) {
     return
   }
   if (recaptchaId === undefined) {