perf: use base64url encoding in node when available

lib/client.js

@@ -9,9 +9,9 @@ const url = require('url');
 
 const { ParseError } = require('got');
 const jose = require('jose');
-const base64url = require('base64url');
 const tokenHash = require('oidc-token-hash');
 
+const base64url = require('./helpers/base64url');
 const defaults = require('./helpers/defaults');
 const { assertSigningAlgValuesSupport, assertIssuerConfiguration } = require('./helpers/assert');
 const pick = require('./helpers/pick');

lib/helpers/base64url.js

@@ -0,0 +1,12 @@
+let encode;
+if (Buffer.isEncoding('base64url')) {
+  encode = (input, encoding = 'utf8') => Buffer.from(input, encoding).toString('base64url');
+} else {
+  const fromBase64 = (base64) => base64.replace(/=/g, '').replace(/\+/g, '-').replace(/\//g, '_');
+  encode = (input, encoding = 'utf8') => fromBase64(Buffer.from(input, encoding).toString('base64'));
+}
+
+const decode = (input) => Buffer.from(input, 'base64');
+
+module.exports.decode = decode;
+module.exports.encode = encode;

lib/helpers/generators.js

@@ -1,13 +1,13 @@
 const { createHash, randomBytes } = require('crypto');
 
-const { encode: base64url } = require('base64url');
+const base64url = require('./base64url');
 
-const random = (bytes = 32) => base64url(randomBytes(bytes));
+const random = (bytes = 32) => base64url.encode(randomBytes(bytes));
 
 module.exports = {
   random,
   state: random,
   nonce: random,
   codeVerifier: random,
-  codeChallenge: (codeVerifier) => base64url(createHash('sha256').update(codeVerifier).digest()),
+  codeChallenge: (codeVerifier) => base64url.encode(createHash('sha256').update(codeVerifier).digest()),
 };

lib/token_set.js

@@ -1,5 +1,4 @@
-const base64url = require('base64url');
-
+const base64url = require('./helpers/base64url');
 const now = require('./helpers/unix_timestamp');
 
 class TokenSet {

package.json

@@ -63,19 +63,19 @@
     ]
   },
   "dependencies": {
-    "base64url": "^3.0.1",
     "got": "^11.8.0",
-    "jose": "^2.0.2",
+    "jose": "^2.0.4",
     "lru-cache": "^6.0.0",
     "make-error": "^1.3.6",
     "object-hash": "^2.0.1",
-    "oidc-token-hash": "^5.0.0",
+    "oidc-token-hash": "^5.0.1",
     "p-any": "^3.0.0"
   },
   "devDependencies": {
     "@commitlint/cli": "^11.0.0",
     "@commitlint/config-conventional": "^11.0.0",
     "@types/passport": "^1.0.4",
+    "base64url": "^3.0.1",
     "chai": "^4.2.0",
     "eslint": "^7.12.1",
     "eslint-config-airbnb-base": "^14.2.0",