chore: license server updates and tests

Co-authored-by: Cursor <cursoragent@cursor.com>

src/server.mjs

@@ -1,10 +1,11 @@
-import { createPrivateKey, randomUUID, sign } from 'node:crypto';
+import { randomUUID } from 'node:crypto';
 import fs from 'node:fs';
 import http from 'node:http';
 import path from 'node:path';
 import { fileURLToPath } from 'node:url';
 
 import { canonicalJson } from '../lib/canonicalJson.mjs';
+import { signPayload } from '../lib/signPayload.mjs';
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const root = path.resolve(__dirname, '..');
@@ -20,21 +21,6 @@ function writeData(data) {
   fs.writeFileSync(p, `${JSON.stringify(data, null, 2)}\n`, 'utf8');
 }
 
-function b64url(buf) {
-  return Buffer.from(buf)
-    .toString('base64')
-    .replace(/\+/g, '-')
-    .replace(/\//g, '_')
-    .replace(/=+$/u, '');
-}
-
-function signPayload(payload, privateKeyPem) {
-  const key = createPrivateKey(privateKeyPem);
-  const body = canonicalJson(payload);
-  const sig = sign(null, Buffer.from(body, 'utf8'), key);
-  return `${b64url(Buffer.from(body, 'utf8'))}.${b64url(sig)}`;
-}
-
 function json(res, code, obj) {
   const body = JSON.stringify(obj);
   res.writeHead(code, {