Use id in uri instead of username

src/server/activitypub/publickey.ts

@@ -1,18 +1,19 @@
 import * as express from 'express';
 import context from '../../remote/activitypub/renderer/context';
 import render from '../../remote/activitypub/renderer/key';
-import config from '../../config';
-import withUser from './with-user';
+import User from '../../models/user';
 
 const app = express.Router();
 
-app.get('/@:user/publickey', withUser(username => {
-	return `${config.url}/@${username}/publickey`;
-}, (user, req, res) => {
+app.get('/users/:user/publickey', async (req, res) => {
+	const userId = req.params.user;
+
+	const user = await User.findOne({ _id: userId });
+
 	const rendered = render(user);
 	rendered['@context'] = context;
 
 	res.json(rendered);
-}));
+});
 
 export default app;