Add messaging widget

src/api/stream/messaging-index.ts

@@ -0,0 +1,10 @@
+import * as websocket from 'websocket';
+import * as redis from 'redis';
+
+export default function(request: websocket.request, connection: websocket.connection, subscriber: redis.RedisClient, user: any): void {
+	// Subscribe messaging index stream
+	subscriber.subscribe(`misskey:messaging-index-stream:${user._id}`);
+	subscriber.on('message', (_, data) => {
+		connection.send(data);
+	});
+}