Integrate LiveKit SFU and harden booking workflow

app/(payload)/api/meetings/[slug]/connect/route.ts

@@ -0,0 +1,42 @@
+import { NextResponse } from "next/server";
+import { getPayload } from "payload";
+import config from "@payload-config";
+import { createLiveKitToken, getLiveKitClientUrl } from "@/lib/meeting/livekit";
+import { isMeetingParticipantKicked } from "@/lib/meeting/kicks";
+import { verifyMeetingToken } from "@/lib/meeting/token";
+
+export const dynamic = "force-dynamic";
+
+type Args = { params: Promise<{ slug: string }> };
+
+/** Exchanges the app's short-lived meeting credential for a LiveKit token. */
+export async function POST(request: Request, { params }: Args) {
+  const { slug } = await params;
+  const authorization = request.headers.get("authorization") ?? "";
+  const appToken = authorization.startsWith("Bearer ") ? authorization.slice(7) : "";
+  const meetingToken = verifyMeetingToken(appToken);
+  if (!meetingToken || meetingToken.eventSlug !== slug) {
+    return NextResponse.json({ error: "Die Meeting-Sitzung ist ungültig." }, { status: 401 });
+  }
+  if (isMeetingParticipantKicked(slug, meetingToken.participantId, meetingToken.clientId)) {
+    return NextResponse.json({ error: "Du wurdest aus diesem Meeting entfernt." }, { status: 403 });
+  }
+
+  try {
+    const payload = await getPayload({ config });
+    const { docs } = await payload.find({ collection: "events", where: { slug: { equals: slug } }, limit: 1 });
+    if (!docs[0]?.isOnline) return NextResponse.json({ error: "Dieser Online-Termin wurde nicht gefunden." }, { status: 404 });
+
+    const participantToken = await createLiveKitToken({
+      eventSlug: slug,
+      participantId: meetingToken.participantId,
+      name: meetingToken.name,
+      role: meetingToken.role,
+      clientId: meetingToken.clientId,
+    });
+    return NextResponse.json({ serverUrl: getLiveKitClientUrl(), participantToken });
+  } catch (error) {
+    console.error("meeting LiveKit connect failed", error);
+    return NextResponse.json({ error: "Der Video-Server ist gerade nicht erreichbar." }, { status: 503 });
+  }
+}

app/(payload)/api/meetings/[slug]/join/route.ts

@@ -4,7 +4,8 @@ import { getPayload } from "payload";
 import config from "@payload-config";
 import { createMeetingToken } from "@/lib/meeting/token";
 import { canJoinMeeting, combineDateAndTime, getMeetingStatus } from "@/lib/meeting/status";
-import { getIceServers } from "@/lib/meeting/iceServers";
+import { createLiveKitToken, getLiveKitClientUrl } from "@/lib/meeting/livekit";
+import { isMeetingParticipantKicked } from "@/lib/meeting/kicks";
 
 export const dynamic = "force-dynamic";
 
@@ -30,9 +31,12 @@ export async function POST(request: Request, { params }: Args) {
   const name = typeof body.name === "string" ? body.name.trim() : "";
   const password = typeof body.password === "string" ? body.password.trim() : "";
   const clientId = typeof body.clientId === "string" ? body.clientId.trim() : undefined;
-  if (!name) {
+  if (!name || name.length > 120) {
     return NextResponse.json({ error: "Bitte gib deinen Namen ein." }, { status: 400 });
   }
+  if (password.length > 200) {
+    return NextResponse.json({ error: "Das Meeting-Passwort ist ungültig." }, { status: 400 });
+  }
 
   try {
     const payload = await getPayload({ config });
@@ -50,7 +54,7 @@ export async function POST(request: Request, { params }: Args) {
     const { user } = await payload.auth({ headers: request.headers });
     // Must check the collection, not just presence — a logged-in customer
     // (collection "customers") must never be treated as host.
-    const isHost = user?.collection === "users";
+    const isHost = user?.collection === "users" && user.role === "admin";
 
     if (!isHost) {
       if (!password) {
@@ -88,7 +92,18 @@ export async function POST(request: Request, { params }: Args) {
       role: isHost ? "host" : "participant",
       // Only meaningful for participants — a host authenticates via a real
       // session already, so there's no need to anchor a kick to it (and
-      // hosts can't be kicked in the first place, see signalingServer.ts).
+      // hosts can't be kicked in the first place.
+      clientId: isHost ? undefined : clientId,
+    });
+
+    if (!isHost && isMeetingParticipantKicked(slug, participantId, clientId)) {
+      return NextResponse.json({ error: "Du wurdest aus diesem Meeting entfernt." }, { status: 403 });
+    }
+    const participantToken = await createLiveKitToken({
+      eventSlug: slug,
+      participantId,
+      name,
+      role: isHost ? "host" : "participant",
       clientId: isHost ? undefined : clientId,
     });
 
@@ -97,7 +112,8 @@ export async function POST(request: Request, { params }: Args) {
       participantId,
       role: isHost ? "host" : "participant",
       eventTitle: event.title,
-      iceServers: getIceServers(),
+      participantToken,
+      serverUrl: getLiveKitClientUrl(),
     });
   } catch (error) {
     console.error("meeting join failed", error);

app/(payload)/api/meetings/[slug]/kick/route.ts

@@ -0,0 +1,50 @@
+import { NextResponse } from "next/server";
+import { getLiveKitRoomName, getLiveKitRoomService } from "@/lib/meeting/livekit";
+import { markMeetingParticipantKicked } from "@/lib/meeting/kicks";
+import { verifyMeetingToken } from "@/lib/meeting/token";
+
+export const dynamic = "force-dynamic";
+
+type Args = { params: Promise<{ slug: string }> };
+
+export async function POST(request: Request, { params }: Args) {
+  const { slug } = await params;
+  const authorization = request.headers.get("authorization") ?? "";
+  const appToken = authorization.startsWith("Bearer ") ? authorization.slice(7) : "";
+  const host = verifyMeetingToken(appToken);
+  if (!host || host.eventSlug !== slug || host.role !== "host") {
+    return NextResponse.json({ error: "Nur der Host darf Teilnehmer entfernen." }, { status: 403 });
+  }
+
+  let body: { participantId?: unknown };
+  try {
+    body = await request.json();
+  } catch {
+    return NextResponse.json({ error: "Ungültige Anfrage." }, { status: 400 });
+  }
+  const participantId = typeof body.participantId === "string" ? body.participantId.trim() : "";
+  if (!participantId || participantId.length > 100 || participantId === host.participantId) {
+    return NextResponse.json({ error: "Ungültiger Teilnehmer." }, { status: 400 });
+  }
+
+  try {
+    const roomService = getLiveKitRoomService();
+    const room = getLiveKitRoomName(slug);
+    const participant = (await roomService.listParticipants(room)).find((item) => item.identity === participantId);
+    if (!participant) return NextResponse.json({ error: "Teilnehmer nicht gefunden." }, { status: 404 });
+
+    let clientId: string | undefined;
+    try {
+      const metadata = JSON.parse(participant.metadata || "{}") as { clientId?: unknown };
+      if (typeof metadata.clientId === "string" && metadata.clientId.length <= 100) clientId = metadata.clientId;
+    } catch {
+      // Metadata is optional; the participant identity is still revoked below.
+    }
+    markMeetingParticipantKicked(slug, participantId, clientId);
+    await roomService.removeParticipant(room, participantId);
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    console.error("meeting participant kick failed", error);
+    return NextResponse.json({ error: "Der Teilnehmer konnte nicht entfernt werden." }, { status: 503 });
+  }
+}

app/(payload)/api/meetings/[slug]/register/route.ts

@@ -1,14 +1,40 @@
 import { NextResponse } from "next/server";
 import { getPayload } from "payload";
 import config from "@payload-config";
+import { checkRateLimit, getClientIp } from "@/lib/auth/rateLimit";
 
 export const dynamic = "force-dynamic";
 
+// Registration capacity is checked before the insert. Serialize registrations
+// for the same event so two simultaneous requests cannot both observe the
+// same free seat in this single-process deployment.
+const registrationLocks = new Map<string, Promise<void>>();
+
+async function withEventRegistrationLock<T>(eventId: string, action: () => Promise<T>): Promise<T> {
+  const previous = registrationLocks.get(eventId) ?? Promise.resolve();
+  let release!: () => void;
+  const current = new Promise<void>((resolve) => {
+    release = resolve;
+  });
+  registrationLocks.set(eventId, current);
+  await previous;
+  try {
+    return await action();
+  } finally {
+    release();
+    if (registrationLocks.get(eventId) === current) registrationLocks.delete(eventId);
+  }
+}
+
 type Args = { params: Promise<{ slug: string }> };
 
 export async function POST(request: Request, { params }: Args) {
   const { slug } = await params;
 
+  if (!checkRateLimit(`event-registration:ip:${getClientIp(request)}`, { max: 20, windowMs: 60 * 60 * 1000 })) {
+    return NextResponse.json({ error: "Zu viele Anmeldungen. Bitte versuche es später erneut." }, { status: 429 });
+  }
+
   let body: { name?: unknown; email?: unknown };
   try {
     body = await request.json();
@@ -17,8 +43,8 @@ export async function POST(request: Request, { params }: Args) {
   }
 
   const name = typeof body.name === "string" ? body.name.trim() : "";
-  const email = typeof body.email === "string" ? body.email.trim() : "";
-  if (!name || !email || !email.includes("@")) {
+  const email = typeof body.email === "string" ? body.email.trim().toLowerCase() : "";
+  if (!name || name.length > 120 || !email || email.length > 254 || !email.includes("@")) {
     return NextResponse.json({ error: "Bitte gib deinen Namen und eine gültige E-Mail-Adresse an." }, { status: 400 });
   }
 
@@ -31,41 +57,46 @@ export async function POST(request: Request, { params }: Args) {
       limit: 1,
     });
     const event = docs[0];
-    if (!event) {
+    if (!event || event._status !== "published" || !event.registrationRequired) {
       return NextResponse.json({ error: "Dieser Termin wurde nicht gefunden." }, { status: 404 });
     }
-
-    const { docs: existingForEmail } = await payload.find({
-      collection: "event-registrations",
-      where: {
-        and: [
-          { event: { equals: event.id } },
-          { email: { equals: email } },
-          { status: { equals: "registered" } },
-        ],
-      },
-      limit: 1,
-    });
-    if (existingForEmail[0]) {
-      return NextResponse.json({ ok: true, alreadyRegistered: true });
+    if (!checkRateLimit(`event-registration:email:${event.id}:${email}`, { max: 3, windowMs: 60 * 60 * 1000 })) {
+      return NextResponse.json({ error: "Zu viele Anmeldeversuche für diese Adresse. Bitte versuche es später erneut." }, { status: 429 });
     }
 
-    if (event.maxParticipants) {
-      const { totalDocs } = await payload.count({
+    return await withEventRegistrationLock(String(event.id), async () => {
+      const { docs: existingForEmail } = await payload.find({
         collection: "event-registrations",
-        where: { and: [{ event: { equals: event.id } }, { status: { equals: "registered" } }] },
+        where: {
+          and: [
+            { event: { equals: event.id } },
+            { email: { equals: email } },
+            { status: { equals: "registered" } },
+          ],
+        },
+        limit: 1,
       });
-      if (totalDocs >= event.maxParticipants) {
-        return NextResponse.json({ error: "Dieser Termin ist bereits ausgebucht." }, { status: 409 });
+      if (existingForEmail[0]) {
+        return NextResponse.json({ ok: true, alreadyRegistered: true });
       }
-    }
 
-    await payload.create({
-      collection: "event-registrations",
-      data: { event: event.id, name, email, status: "registered" },
+      if (event.maxParticipants) {
+        const { totalDocs } = await payload.count({
+          collection: "event-registrations",
+          where: { and: [{ event: { equals: event.id } }, { status: { equals: "registered" } }] },
+        });
+        if (totalDocs >= event.maxParticipants) {
+          return NextResponse.json({ error: "Dieser Termin ist bereits ausgebucht." }, { status: 409 });
+        }
+      }
+
+      await payload.create({
+        collection: "event-registrations",
+        data: { event: event.id, name, email, status: "registered" },
+      });
+
+      return NextResponse.json({ ok: true });
     });
-
-    return NextResponse.json({ ok: true });
   } catch (error) {
     console.error("event registration failed", error);
     return NextResponse.json({ error: "Die Anmeldung ist gerade nicht möglich. Bitte versuche es später erneut." }, { status: 500 });