3 files changed, 116 insertions, 0 deletions
diff --git a/src/server/activitypub/inbox.ts b/src/server/activitypub/inbox.ts
new file mode 100644
index 0000000000..0d4af7c492
--- /dev/null
+++ b/src/server/activitypub/inbox.ts
@@ -0,0 +1,42 @@
+import * as bodyParser from 'body-parser';
+import * as express from 'express';
+import { parseRequest, verifySignature } from 'http-signature';
+import User, { IRemoteAccount } from '../../models/user';
+import queue from '../../queue';
+
+const app = express();
+app.disable('x-powered-by');
+app.use(bodyParser.json());
+
+app.get('/@:user/inbox', async (req, res) => {
+	let parsed;
+
+	try {
+		parsed = parseRequest(req);
+	} catch (exception) {
+		return res.sendStatus(401);
+	}
+
+	const user = await User.findOne({
+		host: { $ne: null },
+		account: { publicKey: { id: parsed.keyId } }
+	});
+
+	if (user === null) {
+		return res.sendStatus(401);
+	}
+
+	if (!verifySignature(parsed, (user.account as IRemoteAccount).publicKey.publicKeyPem)) {
+		return res.sendStatus(401);
+	}
+
+	queue.create('http', {
+		type: 'performActivityPub',
+		actor: user._id,
+		outbox: req.body,
+	}).save();
+
+	return res.sendStatus(200);
+});
+
+export default app;
diff --git a/src/server/activitypub/index.ts b/src/server/activitypub/index.ts
new file mode 100644
index 0000000000..07ff407a76
--- /dev/null
+++ b/src/server/activitypub/index.ts
@@ -0,0 +1,12 @@
+import * as express from 'express';
+
+import user from './user';
+import inbox from './inbox';
+
+const app = express();
+app.disable('x-powered-by');
+
+app.use(user);
+app.use(inbox);
+
+export default app;
diff --git a/src/server/activitypub/user.ts b/src/server/activitypub/user.ts
new file mode 100644
index 0000000000..488de93a92
--- /dev/null
+++ b/src/server/activitypub/user.ts
@@ -0,0 +1,62 @@
+import * as express from 'express';
+import config from '../../conf';
+import { extractPublic } from '../../crypto_key';
+import parseAcct from '../../common/user/parse-acct';
+import User, { ILocalAccount } from '../../models/user';
+
+const app = express();
+app.disable('x-powered-by');
+
+app.get('/@:user', async (req, res, next) => {
+	const accepted = req.accepts(['html', 'application/activity+json', 'application/ld+json']);
+	if (!(['application/activity+json', 'application/ld+json'] as Array<any>).includes(accepted)) {
+		return next();
+	}
+
+	const { username, host } = parseAcct(req.params.user);
+	if (host !== null) {
+		return res.sendStatus(422);
+	}
+
+	const user = await User.findOne({
+		usernameLower: username.toLowerCase(),
+		host: null
+	});
+	if (user === null) {
+		return res.sendStatus(404);
+	}
+
+	const id = `${config.url}/@${user.username}`;
+
+	if (username !== user.username) {
+		return res.redirect(id);
+	}
+
+	res.json({
+		'@context': [
+			'https://www.w3.org/ns/activitystreams',
+			'https://w3id.org/security/v1'
+		],
+		type: 'Person',
+		id,
+		inbox: `${id}/inbox`,
+		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;