Refactor to use hooks (#436)

app/(auth)/auth.config.ts

@@ -0,0 +1,39 @@
+import { NextAuthConfig } from "next-auth";
+
+export const authConfig = {
+  pages: {
+    signIn: "/login",
+    newUser: "/",
+  },
+  providers: [
+    // added later in auth.ts since it requires bcrypt which is only compatible with Node.js
+    // while this file is also used in non-Node.js environments
+  ],
+  callbacks: {
+    authorized({ auth, request: { nextUrl } }) {
+      let isLoggedIn = !!auth?.user;
+      let isOnChat = nextUrl.pathname.startsWith("/");
+      let isOnRegister = nextUrl.pathname.startsWith("/register");
+      let isOnLogin = nextUrl.pathname.startsWith("/login");
+
+      if (isLoggedIn && (isOnLogin || isOnRegister)) {
+        return Response.redirect(new URL("/", nextUrl));
+      }
+
+      if (isOnRegister || isOnLogin) {
+        return true; // Always allow access to register and login pages
+      }
+
+      if (isOnChat) {
+        if (isLoggedIn) return true;
+        return false; // Redirect unauthenticated users to login page
+      }
+
+      if (isLoggedIn) {
+        return Response.redirect(new URL("/", nextUrl));
+      }
+
+      return true;
+    },
+  },
+} satisfies NextAuthConfig;