fix: harden booking and meeting flows

lib/meeting/revoke.ts

@@ -0,0 +1,19 @@
+import type { CollectionAfterChangeHook } from "payload";
+import type { Event } from "@/payload-types";
+import { meetingAccessVersion } from "./access";
+import { getLiveKitRoomName, getLiveKitRoomService } from "./livekit";
+
+/** Disconnect the previous room when its password, schedule or access changes. */
+export const revokeChangedMeeting: CollectionAfterChangeHook<Event> = async ({ doc, previousDoc, req }) => {
+  if (!previousDoc?.isOnline || !previousDoc.slug || !process.env.LIVEKIT_URL || !process.env.MEETING_SESSION_SECRET) return doc;
+  const previousVersion = meetingAccessVersion(previousDoc);
+  if (previousVersion === meetingAccessVersion(doc)) return doc;
+  try {
+    const service = getLiveKitRoomService();
+    const name = getLiveKitRoomName(previousDoc.slug, previousVersion);
+    if ((await service.listRooms([name])).length) await service.deleteRoom(name);
+  } catch (err) {
+    req.payload.logger.error({ err, msg: "Could not disconnect revoked meeting room" });
+  }
+  return doc;
+};