middleware.ts

import NextAuth from "next-auth";

import authConfig from "@/auth.config";
import {
    DEFAULT_LOGIN_REDIRECT,
    apiAuthPrefix,
    authRoutes,
    privateRoutes,
} from "@/routes";

const { auth } = NextAuth(authConfig);

export default auth((req) => {
    const { nextUrl } = req;
    const isLoggedIn = !!req.auth;

    const isApiAuthRoute = nextUrl.pathname.startsWith(apiAuthPrefix);
    const isPrivateRoute = privateRoutes.includes(nextUrl.pathname);
    const isAuthRoute = authRoutes.includes(nextUrl.pathname);

    if (isApiAuthRoute) {
        return null;
    }

    if (isAuthRoute) {
        if (isLoggedIn) {
        return Response.redirect(new URL(DEFAULT_LOGIN_REDIRECT, nextUrl))
        }
        return null;
    }

    if (!isLoggedIn && isPrivateRoute ) {
        return Response.redirect(new URL("/login", nextUrl));
    }

    return null;
})

// Optionally, don't invoke Middleware on some paths
export const config = {
    matcher: ['/((?!.+\\.[\\w]+$|_next).*)', '/', '/(api|trpc)(.*)'],
}