2 files changed, 62 insertions, 0 deletions
diff --git a/src/server/activitypub.ts b/src/server/activitypub.ts
new file mode 100644
index 0000000000..6cc31de7b5
--- /dev/null
+++ b/src/server/activitypub.ts
@@ -0,0 +1,60 @@
+import config from '../conf';
+import { extractPublic } from '../crypto_key';
+import parseAcct from '../common/user/parse-acct';
+import User, { ILocalAccount } from '../models/user';
+const express = require('express');
+
+const app = express();
+
+app.get('/@:user', async (req, res, next) => {
+	const accepted = req.accepts(['html', 'application/activity+json', 'application/ld+json']);
+	if (!['application/activity+json', 'application/ld+json'].includes(accepted)) {
+		return next();
+	}
+
+	const { username, host } = parseAcct(req.params.user);
+	if (host !== null) {
+		return res.send(422);
+	}
+
+	const user = await User.findOne({
+		usernameLower: username.toLowerCase(),
+		host: null
+	});
+	if (user === null) {
+		return res.send(404);
+	}
+
+	const id = `${config.url}/@${user.username}`;
+
+	if (username !== user.username) {
+		return res.redirect(id);
+	}
+
+	res.json({
+		'@context': [
+			'https://www.w3.org/ns/activitystreams',
+			'https://w3id.org/security/v1'
+		],
+		type: 'Person',
+		id,
+		preferredUsername: user.username,
+		name: user.name,
+		summary: user.description,
+		icon: user.avatarId && {
+			type: 'Image',
+			url: `${config.drive_url}/${user.avatarId}`
+		},
+		image: user.bannerId && {
+			type: 'Image',
+			url: `${config.drive_url}/${user.bannerId}`
+		},
+		publicKey: {
+			type: 'Key',
+			owner: id,
+			publicKeyPem: extractPublic((user.account as ILocalAccount).keypair)
+		}
+	});
+});
+
+export default app;
diff --git a/src/server/index.ts b/src/server/index.ts
index fe22d9c9b3..92d46d46a2 100644
--- a/src/server/index.ts
+++ b/src/server/index.ts
@@ -9,6 +9,7 @@ import * as express from 'express';
 import * as morgan from 'morgan';
 import Accesses from 'accesses';
 
+import activityPub from './activitypub';
 import log from './log-request';
 import config from '../conf';
 
@@ -53,6 +54,7 @@ app.use((req, res, next) => {
  */
 app.use('/api', require('./api'));
 app.use('/files', require('./file'));
+app.use(activityPub);
 app.use(require('./web'));
 
 function createServer() {