Improve MineGeo exploration and mapping features

lib/supabase.ts

@@ -2,6 +2,7 @@ import "server-only";
 import { createClient } from "@supabase/supabase-js";
 import { createServerClient } from "@supabase/ssr";
 import { cookies } from "next/headers";
+import { cache } from "react";
 import type { Database } from "@/shared/database";
 let singleton: ReturnType<typeof createClient<Database>> | undefined;
 export function admin() {
@@ -36,13 +37,18 @@ export async function authClient() {
     },
   );
 }
-export async function user() {
+export const user = cache(async function user() {
+  if (
+    !process.env.NEXT_PUBLIC_SUPABASE_URL ||
+    !process.env.NEXT_PUBLIC_SUPABASE_PUBLISHABLE_KEY
+  )
+    return null;
   const client = await authClient();
   const {
     data: { user },
   } = await client.auth.getUser();
   return user;
-}
+});
 export function required<T>(result: {
   data: T;
   error: { message: string } | null;