From 8a925177e1bc86c1d0a269d08085e71136f0e5af Mon Sep 17 00:00:00 2001
From: Antonio Davi Macedo Coelho de Castro <adavimacedo@gmail.com>
Date: Thu, 25 Jul 2019 10:20:28 -0700
Subject: [PATCH] Cache apple public key for the case it fails to fetch again
 (#5848)

---
 src/Adapters/Auth/apple.js | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/Adapters/Auth/apple.js b/src/Adapters/Auth/apple.js
index f8ae9522..cf1d6f17 100644
--- a/src/Adapters/Auth/apple.js
+++ b/src/Adapters/Auth/apple.js
@@ -5,8 +5,19 @@ const jwt = require('jsonwebtoken');
 
 const TOKEN_ISSUER = 'https://appleid.apple.com';
 
+let currentKey;
+
 const getApplePublicKey = async () => {
-  const data = await httpsRequest.get('https://appleid.apple.com/auth/keys');
+  let data;
+  try {
+    data = await httpsRequest.get('https://appleid.apple.com/auth/keys');
+  } catch (e) {
+    if (currentKey) {
+      return currentKey;
+    }
+    throw e;
+  }
+
   const key = data.keys[0];
 
   const pubKey = new NodeRSA();
@@ -14,7 +25,8 @@ const getApplePublicKey = async () => {
     { n: Buffer.from(key.n, 'base64'), e: Buffer.from(key.e, 'base64') },
     'components-public'
   );
-  return pubKey.exportKey(['public']);
+  currentKey = pubKey.exportKey(['public']);
+  return currentKey;
 };
 
 const verifyIdToken = async (token, clientID) => {