casbin.ts

import { Enforcer, newEnforcer, StringAdapter } from "casbin";
import { join } from "path";
import { cwd } from "process";

declare global {
  var __casbin: Enforcer;
}

await (async function getEnforcer() {
  if (global.__casbin) {
    return global.__casbin;
  }

  const sa = new StringAdapter(`
p, alice, data1, read
p, bob, data2, write
p, data2_admin, data2, read
p, data2_admin, data2, write
g, alice, data2_admin
`);

  const filePath = join(cwd(), 'rbac-model.conf');
  const enforcer = await newEnforcer(filePath, sa);
  global.__casbin = enforcer;

  return enforcer;
})();

export const enforcer = global.__casbin;

layout.tsx

import '@/casbin';

page.tsx

import { enforcer } from "@/casbin";

export default async function Home() {
  const res = await enforcer.enforce('alice', 'data1', 'read');

  return (
    <main className="flex min-h-screen flex-col items-center justify-between p-24">
      File Status 200
      {JSON.stringify(res, null, 2)}
    </main>
  );
}