qruiq-google-auth

qruiq-google-auth

NextAuth.js v4 + PrismaAdapter + Google OAuth + JWT Session + route protection middleware.

Parameters

Collect before execution:

NEXTAUTH_SECRET is auto-generated during setup.

Steps

Execute all steps directly. Do not list as TODOs.

1. Install dependencies

yarn add next-auth @auth/prisma-adapter @prisma/client
yarn add -D prisma

2. Copy template files

cp -r ~/.qruiq/skills/skills/qruiq-google-auth/template/app/api/auth app/api/
cp -r ~/.qruiq/skills/skills/qruiq-google-auth/template/app/api/health app/api/
cp ~/.qruiq/skills/skills/qruiq-google-auth/template/middleware.ts .

3. Initialize Prisma

npx prisma init

Edit prisma/schema.prisma — add the four NextAuth tables (Account, Session, User, VerificationToken). See "Prisma Schema" section below.

npx prisma db push

4. Create .env

NEXTAUTH_SECRET=<run: openssl rand -base64 32>
NEXTAUTH_URL=<NEXTAUTH_URL>
GOOGLE_CLIENT_ID=<GOOGLE_CLIENT_ID>
GOOGLE_CLIENT_SECRET=<GOOGLE_CLIENT_SECRET>
DATABASE_URL=<DATABASE_URL>

5. Add SessionProvider to app/providers.tsx

import { SessionProvider } from "next-auth/react";

export function Providers({ children, themeProps, session }) {
  const router = useRouter();
  return (
    <SessionProvider session={session}>
      <HeroUIProvider navigate={router.push}>
        <NextThemesProvider {...themeProps}>{children}</NextThemesProvider>
      </HeroUIProvider>
    </SessionProvider>
  );
}

Core files

app/api/auth/[...nextauth]/lib/options.ts

import { PrismaAdapter } from '@auth/prisma-adapter';
import type { NextAuthOptions } from 'next-auth';
import GoogleProvider from 'next-auth/providers/google';
import prisma from '@/lib/prisma';

export const authOptions: NextAuthOptions = {
  secret: process.env.NEXTAUTH_SECRET,
  adapter: PrismaAdapter(prisma),
  providers: [
    GoogleProvider({
      clientId: process.env.GOOGLE_CLIENT_ID ?? '',
      clientSecret: process.env.GOOGLE_CLIENT_SECRET ?? '',
      authorization: {
        params: {
          prompt: 'consent',
          access_type: 'offline',
          response_type: 'code',
          redirect_uri: `${process.env.NEXTAUTH_URL}/api/auth/callback/google`,
        },
      },
      checks: ['state', 'pkce'],
      profile(profile) {
        return {
          id: profile.sub,
          name: profile.name,
          email: profile.email,
          image: profile.picture,
          emailVerified: profile.email_verified,
        };
      },
    }),
  ],
  pages: { signIn: '/', error: '/' },
  session: { strategy: 'jwt', maxAge: 30 * 24 * 60 * 60 },
  callbacks: {
    async jwt({ token, user, account }) {
      if (user) token.sub = user.id;
      if (account) token.provider = account.provider;
      return token;
    },
    async session({ session, token }) {
      if (session.user) session.user.id = token.sub as string;
      return session;
    },
    async redirect({ url, baseUrl }) {
      if (url.startsWith('/')) return new URL(url, baseUrl).toString();
      if (url.startsWith(baseUrl)) return url;
      return baseUrl;
    },
  },
};

middleware.ts — Route protection

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import { getToken } from 'next-auth/jwt';

const PUBLIC_PATHS = ['/', '/api/auth'];

export async function middleware(request: NextRequest) {
  const path = request.nextUrl.pathname;
  if (path.startsWith('/api/auth/callback/')) return NextResponse.next();
  const isPublic = PUBLIC_PATHS.some(p => path === p || path.startsWith(p + '/'));
  if (isPublic || path.startsWith('/api/')) return NextResponse.next();
  const token = await getToken({ req: request, secret: process.env.NEXTAUTH_SECRET });
  if (token) return NextResponse.next();
  const callbackUrl = encodeURIComponent(request.url);
  return NextResponse.redirect(new URL(`/?callbackUrl=${callbackUrl}`, request.url));
}

export const config = {
  matcher: ['/dashboard/:path*', '/profile/:path*'],
};

Prisma Schema

model Account {
  id                String  @id @default(cuid())
  userId            String
  type              String
  provider          String
  providerAccountId String
  refresh_token     String? @db.Text
  access_token      String? @db.Text
  expires_at        Int?
  token_type        String?
  scope             String?
  id_token          String? @db.Text
  session_state     String?
  user              User    @relation(fields: [userId], references: [id], onDelete: Cascade)
  @@unique([provider, providerAccountId])
}

model Session {
  id           String   @id @default(cuid())
  sessionToken String   @unique
  userId       String
  expires      DateTime
  user         User     @relation(fields: [userId], references: [id], onDelete: Cascade)
}

model User {
  id            String    @id @default(cuid())
  name          String?
  email         String?   @unique
  emailVerified DateTime?
  image         String?
  accounts      Account[]
  sessions      Session[]
}

model VerificationToken {
  identifier String
  token      String   @unique
  expires    DateTime
  @@unique([identifier, token])
}

Google Cloud Console setup

1. Go to Google Cloud Console → APIs & Services → Credentials
2. Create OAuth 2.0 Client ID (Web application)
3. Authorized JavaScript origins: http://localhost:3000 + https://your-domain.com
4. Authorized redirect URIs: http://localhost:3000/api/auth/callback/google + https://your-domain.com/api/auth/callback/google

Notes

• NEXTAUTH_URL must be injected via K8s Secret when deploying — must match external domain exactly
• Google Console callback URL must exactly match NEXTAUTH_URL, otherwise redirect_uri_mismatch
• checks: ['state', 'pkce'] is a security best practice — do not remove
• Multiple domains (dev/prod) each need separate entries in Google Console