session livekit token

server/auth/lucia.ts

@@ -1,12 +1,13 @@
 import { PrismaAdapter } from '@lucia-auth/adapter-prisma'
-import { Lucia } from 'lucia'
+import { Lucia, TimeSpan } from 'lucia'
 import prisma from '../prisma/client.ts'
 
 declare module 'lucia' {
   interface Register {
-    Lucia: typeof Lucia
+    Lucia: typeof auth
     UserId: string
     DatabaseUserAttributes: DatabaseUserAttributes
+    DatabaseSessionAttributes: DatabaseSessionAttributes
   }
 }
 
@@ -16,7 +17,14 @@ interface DatabaseUserAttributes {
   username: string
 }
 
+interface DatabaseSessionAttributes {
+  livekitToken: string | null
+}
+
+export const SESSION_EXPIRES_IN = new TimeSpan(30, 'd')
+
 export const auth = new Lucia(new PrismaAdapter(prisma.session, prisma.user), {
+  sessionExpiresIn: SESSION_EXPIRES_IN,
   sessionCookie: {
     attributes: {
       sameSite: 'none',
@@ -29,6 +37,11 @@ export const auth = new Lucia(new PrismaAdapter(prisma.session, prisma.user), {
       username,
     }
   },
+  getSessionAttributes: ({ livekitToken }) => {
+    return {
+      livekitToken,
+    }
+  },
 })
 
 export type Auth = typeof auth

server/package.json

@@ -18,6 +18,7 @@
     "dotenv": "^17.2.3",
     "fastify": "^5.6.1",
     "fastify-plugin": "^5.1.0",
+    "livekit-server-sdk": "^2.18.0",
     "lucia": "^3.2.2",
     "mediasoup": "^3.19.3",
     "prisma": "^6.17.0",

server/prisma/migrations/20260905083743_session_livekit_token/migration.sql

@@ -0,0 +1,2 @@
+-- AlterTable
+ALTER TABLE "Session" ADD COLUMN "livekitToken" TEXT;

server/prisma/schema.prisma

@@ -24,6 +24,7 @@ model Session {
   id           String   @id
   userId       String
   expiresAt    DateTime
+  livekitToken String?
 
   user User @relation(references: [id], fields: [userId], onDelete: Cascade)
 

server/routes/auth.ts

@@ -3,6 +3,7 @@ import bcrypt from 'bcrypt'
 import { z } from 'zod'
 import { auth } from '../auth/lucia.ts'
 import prisma from '../prisma/client.ts'
+import { createSessionLivekitToken, getSessionLivekitToken } from '../utils/livekit.ts'
 
 export default function (fastify: FastifyInstance) {
   fastify.post('/register', async (req, reply) => {
@@ -22,7 +23,9 @@ export default function (fastify: FastifyInstance) {
         },
       })
 
-      const session = await auth.createSession(user.id, {})
+      const session = await auth.createSession(user.id, {
+        livekitToken: await createSessionLivekitToken(user),
+      })
       const cookie = auth.createSessionCookie(session.id)
 
       reply.setCookie(cookie.name, cookie.value, cookie.attributes)
@@ -67,7 +70,9 @@ export default function (fastify: FastifyInstance) {
         return reply.code(404).send({ error: 'Incorrect username or password' })
       }
 
-      const session = await auth.createSession(user.id, {})
+      const session = await auth.createSession(user.id, {
+        livekitToken: await createSessionLivekitToken(user),
+      })
       const cookie = auth.createSessionCookie(session.id)
 
       reply.setCookie(cookie.name, cookie.value, cookie.attributes)
@@ -92,11 +97,22 @@ export default function (fastify: FastifyInstance) {
   })
 
   fastify.get('/me', async (req, reply) => {
-    if (req.user) {
+    if (!req.user || !req.session) {
-      return req.user
+      reply.code(401).send(false)
+
+      return
     }
 
-    reply.code(401).send(false)
+    try {
+      return {
+        ...req.user,
+        livekitToken: await getSessionLivekitToken(req.user, req.session),
+      }
+    }
+    catch (err) {
+      fastify.log.error(err)
+      reply.code(500).send({ error: err.message })
+    }
   })
 
   fastify.post('/logout', async (req, reply) => {

server/server.ts

@@ -1,3 +1,5 @@
+/* eslint-disable perfectionist/sort-imports -- .env must be loaded before any import that reads process.env */
+import 'dotenv/config'
 import { dirname, join } from 'node:path'
 import { fileURLToPath } from 'node:url'
 import FastifyAutoLoad from '@fastify/autoload'

server/utils/livekit.ts

@@ -0,0 +1,78 @@
+import type { Session, User } from 'lucia'
+import { Buffer } from 'node:buffer'
+import { AccessToken } from 'livekit-server-sdk'
+import { SESSION_EXPIRES_IN } from '../auth/lucia.ts'
+import prisma from '../prisma/client.ts'
+
+/**
+ * Re-issue the token slightly before it actually expires, so a client that
+ * caches the /me response for a while still gets a usable token.
+ */
+const REFRESH_BEFORE_EXPIRY_SECONDS = 60 * 60
+
+export async function createLivekitToken(user: User, ttlSeconds: number) {
+  const apiKey = process.env.LIVEKIT_API_KEY
+  const apiSecret = process.env.LIVEKIT_API_SECRET
+
+  if (!apiKey || !apiSecret)
+    throw new Error('LIVEKIT_API_KEY and LIVEKIT_API_SECRET must be set')
+
+  const token = new AccessToken(apiKey, apiSecret, {
+    identity: user.id,
+    name: user.displayName,
+    ttl: ttlSeconds,
+  })
+
+  token.addGrant({
+    room: process.env.LIVEKIT_ROOM || 'chad',
+    roomJoin: true,
+    canPublish: true,
+    canSubscribe: true,
+    canPublishData: true,
+    canUpdateOwnMetadata: true,
+  })
+
+  return token.toJwt()
+}
+
+/** Mints the token that gets stored on a session at the moment it is created. */
+export function createSessionLivekitToken(user: User) {
+  return createLivekitToken(user, SESSION_EXPIRES_IN.seconds())
+}
+
+/**
+ * Returns the token stored alongside the session, re-issuing and persisting it
+ * when it is missing (session predates the column) or about to expire (Lucia
+ * extends `expiresAt` on active sessions, outliving the original token).
+ */
+export async function getSessionLivekitToken(user: User, session: Session) {
+  if (session.livekitToken && !isExpiringSoon(session.livekitToken))
+    return session.livekitToken
+
+  const ttlSeconds = Math.max(
+    Math.ceil((session.expiresAt.getTime() - Date.now()) / 1000),
+    REFRESH_BEFORE_EXPIRY_SECONDS,
+  )
+  const livekitToken = await createLivekitToken(user, ttlSeconds)
+
+  await prisma.session.update({
+    where: { id: session.id },
+    data: { livekitToken },
+  })
+
+  session.livekitToken = livekitToken
+
+  return livekitToken
+}
+
+function isExpiringSoon(token: string) {
+  try {
+    const [, payload] = token.split('.')
+    const { exp } = JSON.parse(Buffer.from(payload, 'base64url').toString())
+
+    return typeof exp !== 'number' || exp - REFRESH_BEFORE_EXPIRY_SECONDS <= Date.now() / 1000
+  }
+  catch {
+    return true
+  }
+}

server/yarn.lock

@@ -119,6 +119,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@bufbuild/protobuf@npm:^1.10.0, @bufbuild/protobuf@npm:^1.10.1":
+  version: 1.10.1
+  resolution: "@bufbuild/protobuf@npm:1.10.1"
+  checksum: 10c0/a89572ae99aa193dd232fca0cdc9ece1dfe2f3d8b061be1f966a4f88fb63410aeb0fe7de927037e970aefcb52036eec58a7f89a40fe1286eed1448ea1bd2634e
+  languageName: node
+  linkType: hard
+
 "@clack/core@npm:0.5.0":
   version: 0.5.0
   resolution: "@clack/core@npm:0.5.0"
@@ -498,6 +505,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@livekit/protocol@npm:1.48.0":
+  version: 1.48.0
+  resolution: "@livekit/protocol@npm:1.48.0"
+  dependencies:
+    "@bufbuild/protobuf": "npm:^1.10.0"
+  checksum: 10c0/665ada6b38578f53bc2854d709f05a642cfdad8c671571bd02dc0c6d1b94028d02ce5e7dd86862a2260d6fc0647d333811ce3b85127ba40e37ef76d426547d48
+  languageName: node
+  linkType: hard
+
 "@lucia-auth/adapter-prisma@npm:^4.0.1":
   version: 4.0.1
   resolution: "@lucia-auth/adapter-prisma@npm:4.0.1"
@@ -2747,6 +2763,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"jose@npm:^5.1.2":
+  version: 5.10.0
+  resolution: "jose@npm:5.10.0"
+  checksum: 10c0/e20d9fc58d7e402f2e5f04e824b8897d5579aae60e64cb88ebdea1395311c24537bf4892f7de413fab1acf11e922797fb1b42269bc8fc65089a3749265ccb7b0
+  languageName: node
+  linkType: hard
+
 "js-yaml@npm:^4.1.0":
   version: 4.1.0
   resolution: "js-yaml@npm:4.1.0"
@@ -2876,6 +2899,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"livekit-server-sdk@npm:^2.18.0":
+  version: 2.18.0
+  resolution: "livekit-server-sdk@npm:2.18.0"
+  dependencies:
+    "@bufbuild/protobuf": "npm:^1.10.1"
+    "@livekit/protocol": "npm:1.48.0"
+    jose: "npm:^5.1.2"
+  checksum: 10c0/5150170be1302bbbcde32f558eb6104a93a6a56fc656b776db50db7eb0a35285e54c28630d993ac809ecb025626d4c7c989721bebc0d0562640b58edcdd72abe
+  languageName: node
+  linkType: hard
+
 "local-pkg@npm:^1.1.2":
   version: 1.1.2
   resolution: "local-pkg@npm:1.1.2"
@@ -4303,6 +4337,7 @@ __metadata:
     eslint: "npm:^9.36.0"
     fastify: "npm:^5.6.1"
     fastify-plugin: "npm:^5.1.0"
+    livekit-server-sdk: "npm:^2.18.0"
     lucia: "npm:^3.2.2"
     mediasoup: "npm:^3.19.3"
     prisma: "npm:^6.17.0"