Patchpass V1

Backend/src/lib/WsHub.ts

@@ -0,0 +1,30 @@
+import { Channel } from "rjweb-server";
+
+/**
+ * Real-time hub. One RJWEB Channel per human account; the websocket endpoint
+ * subscribes each authenticated socket to its owner's channel via
+ * `ctr.printChannel(getUserChannel(userId))`. Any server-side event for that
+ * user (new notification, request state change) is published to the channel and
+ * fanned out to every open socket.
+ */
+const userChannels = new Map<number, Channel<string>>();
+
+export function getUserChannel(userId: number): Channel<string> {
+	let channel = userChannels.get(userId);
+	if (!channel) {
+		channel = new Channel<string>();
+		userChannels.set(userId, channel);
+	}
+	return channel;
+}
+
+export type RealtimeEvent =
+	| { kind: "notification"; notification: unknown; unreadCount: number }
+	| { kind: "request_event"; event: string; requestPublicId: string }
+	| { kind: "ping"; at: string };
+
+export async function publishToUser(userId: number, event: RealtimeEvent): Promise<void> {
+	const channel = userChannels.get(userId);
+	if (!channel) return; // nobody connected — nothing to push
+	await channel.send("text", JSON.stringify(event));
+}