middleware.ts

import NextAuth from "next-auth";

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

const {auth} = NextAuth(authConfig);

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

    const isApiAuthRoute = nextUrl.pathname.startsWith(apiAuthPrefix)

    const isPublicRoute = publicRoutes.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 && !isPublicRoute){
        return Response.redirect(new URL("/auth/sign-in", nextUrl))
    }

    return null;
})

export const config = {
  // copied from clerk
  matcher: ["/((?!.+\\.[\\w]+$|_next).*)", "/", "/(api|trpc)(.*)"],
};