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buzz-sheet/lib/auth/server.ts
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gunshiz e860425e08
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feat(auth) : protect admin login with turnstile
2026-09-10 21:39:07 +07:00

131 lines
3.3 KiB
TypeScript

import "server-only";
import { betterAuth } from "better-auth";
import { drizzleAdapter } from "better-auth/adapters/drizzle";
import { nextCookies } from "better-auth/next-js";
import { admin, captcha } from "better-auth/plugins";
import { headers } from "next/headers";
import { getDb } from "@/db";
import {
accounts,
sessions,
users,
verifications,
} from "@/db/schema";
import { isAuthorizedAdmin, type SessionUserLike } from "./authorization";
function required(name: string): string {
const value = process.env[name];
if (!value) throw new Error(`${name} is required for authentication.`);
return value;
}
function hasAuthConfiguration(): boolean {
return ["DATABASE_URL", "BETTER_AUTH_URL", "BETTER_AUTH_SECRET"].every(
(name) => Boolean(process.env[name]),
);
}
function createAuth() {
return betterAuth({
appName: "Buzz Sheet",
database: drizzleAdapter(getDb(), {
provider: "pg",
schema: {
user: users,
session: sessions,
account: accounts,
verification: verifications,
},
transaction: true,
}),
baseURL: required("BETTER_AUTH_URL"),
trustedOrigins: process.env.BETTER_AUTH_TRUSTED_ORIGINS
?.split(",")
.map((origin) => origin.trim())
.filter(Boolean),
secret: required("BETTER_AUTH_SECRET"),
emailAndPassword: {
enabled: true,
disableSignUp: true,
minPasswordLength: 8,
maxPasswordLength: 128,
},
databaseHooks: {
user: {
create: {
before: async () => ({ data: { emailVerified: true } }),
},
},
},
plugins: [
captcha({
provider: "cloudflare-turnstile",
secretKey: required("TURNSTILE_SECRET_KEY"),
endpoints: ["/sign-in/email"],
}),
admin({ defaultRole: "admin" }),
nextCookies(),
],
});
}
type AuthInstance = ReturnType<typeof createAuth>;
let authInstance: AuthInstance | undefined;
export function getAuth(): AuthInstance {
if (!authInstance) authInstance = createAuth();
return authInstance;
}
export interface AdminSession {
user: SessionUserLike;
session: { id: string };
}
export async function getAdminSession(): Promise<AdminSession | null> {
if (process.env.BUZZ_DEMO_MODE === "true") {
return {
user: {
id: "demo-admin",
email: "[email protected]",
emailVerified: true,
name: "Demo Admin",
},
session: { id: "demo-session" },
};
}
// Public pages can be prerendered without the runtime auth secret. In that
// case the header simply omits the admin link; auth routes still fail loudly
// through getAuth() when authentication is actually used.
if (!hasAuthConfiguration()) return null;
const session = await getAuth().api.getSession({ headers: await headers() });
if (
!session?.session ||
!isAuthorizedAdmin(session.user)
) {
return null;
}
return {
user: session.user,
session: { id: session.session.id },
};
}
export class AdminAuthorizationError extends Error {
constructor() {
super("Admin authorization required.");
this.name = "AdminAuthorizationError";
}
}
export async function requireAdmin(): Promise<AdminSession> {
const session = await getAdminSession();
if (!session) throw new AdminAuthorizationError();
return session;
}