deps: replace base64url with inline definition

lib/sign-stream.js

@@ -1,11 +1,20 @@
 /*global module*/
-var base64url = require('base64url');
+var Buffer = require('safe-buffer').Buffer;
 var DataStream = require('./data-stream');
 var jwa = require('jwa');
 var Stream = require('stream');
 var toString = require('./tostring');
 var util = require('util');
 
+function base64url(string, encoding) {
+  return Buffer
+    .from(string, encoding)
+    .toString('base64')
+    .replace(/=/g, '')
+    .replace(/\+/g, '-')
+    .replace(/\//g, '_');
+}
+
 function jwsSecuredInput(header, payload, encoding) {
   encoding = encoding || 'utf8';
   var encodedHeader = base64url(toString(header), 'binary');

lib/verify-stream.js

@@ -1,5 +1,5 @@
 /*global module*/
-var base64url = require('base64url');
+var Buffer = require('safe-buffer').Buffer;
 var DataStream = require('./data-stream');
 var jwa = require('jwa');
 var Stream = require('stream');
@@ -20,7 +20,7 @@ function safeJsonParse(thing) {
 
 function headerFromJWS(jwsSig) {
   var encodedHeader = jwsSig.split('.', 1)[0];
-  return safeJsonParse(base64url.decode(encodedHeader, 'binary'));
+  return safeJsonParse(Buffer.from(encodedHeader, 'base64').toString('binary'));
 }
 
 function securedInputFromJWS(jwsSig) {
@@ -34,7 +34,7 @@ function signatureFromJWS(jwsSig) {
 function payloadFromJWS(jwsSig, encoding) {
   encoding = encoding || 'utf8';
   var payload = jwsSig.split('.')[1];
-  return base64url.decode(payload, encoding);
+  return Buffer.from(payload, 'base64').toString(encoding);
 }
 
 function isValidJws(string) {

package.json

@@ -24,7 +24,6 @@
   "readmeFilename": "readme.md",
   "gitHead": "c0f6b27bcea5a2ad2e304d91c2e842e4076a6b03",
   "dependencies": {
-    "base64url": "^2.0.0",
     "jwa": "^1.1.5",
     "safe-buffer": "^5.0.1"
   },