From d5af559a94f51ee82951e1def5c5c5749dfa290a Mon Sep 17 00:00:00 2001
From: Filip Skokan <panva.ip@gmail.com>
Date: Mon, 18 Jan 2021 13:43:25 +0100
Subject: [PATCH] perf: improve base64url encoding when available in Node.js

---
 lib/help/base64url.js | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/lib/help/base64url.js b/lib/help/base64url.js
index 16d77a0ce3..003ca6d46f 100644
--- a/lib/help/base64url.js
+++ b/lib/help/base64url.js
@@ -1,13 +1,12 @@
-const fromBase64 = (base64) => {
-  return base64.replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_')
-}
-
-const encode = (input, encoding = 'utf8') => {
-  return fromBase64(Buffer.from(input, encoding).toString('base64'))
-}
-
-const encodeBuffer = (buf) => {
-  return fromBase64(buf.toString('base64'))
+let encode;
+let encodeBuffer;
+if (Buffer.isEncoding('base64url')) {
+  encode = (input, encoding = 'utf8') => Buffer.from(input, encoding).toString('base64url');
+  encodeBuffer = (buf) => buf.toString('base64url');
+} else {
+  const fromBase64 = (base64) => base64.replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_');
+  encode = (input, encoding = 'utf8') => fromBase64(Buffer.from(input, encoding).toString('base64'));
+  encodeBuffer = (buf) => fromBase64(buf.toString('base64'));
 }
 
 const decodeToBuffer = (input) => {