84 lines
2.5 KiB
TypeScript
84 lines
2.5 KiB
TypeScript
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/**
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* Admin authentication utilities.
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* Uses HMAC-signed session tokens stored in HttpOnly cookies.
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*/
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import crypto from 'crypto';
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import { env } from '../env';
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import { cookies } from 'next/headers';
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const COOKIE_NAME = 'folio_admin_session';
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const SESSION_DURATION_MS = 24 * 60 * 60 * 1000; // 24 hours
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function getSigningKey(): Buffer {
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const secret = env.AUTH_SECRET || 'dev-fallback-secret';
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return crypto.createHash('sha256').update(`admin:${secret}`).digest();
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}
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/** Create a signed session token. */
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export function createAdminToken(): string {
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const payload = {
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role: 'admin',
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iat: Date.now(),
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exp: Date.now() + SESSION_DURATION_MS,
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};
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const data = Buffer.from(JSON.stringify(payload)).toString('base64url');
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const key = getSigningKey();
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const sig = crypto.createHmac('sha256', key).update(data).digest('base64url');
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return `${data}.${sig}`;
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}
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/** Verify a session token. Returns true if valid. */
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export function verifyAdminToken(token: string): boolean {
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const parts = token.split('.');
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if (parts.length !== 2) return false;
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const [data, sig] = parts;
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const key = getSigningKey();
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const expectedSig = crypto.createHmac('sha256', key).update(data).digest('base64url');
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if (!crypto.timingSafeEqual(Buffer.from(sig), Buffer.from(expectedSig))) {
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return false;
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}
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try {
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const payload = JSON.parse(Buffer.from(data, 'base64url').toString());
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if (payload.role !== 'admin') return false;
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if (typeof payload.exp !== 'number' || payload.exp < Date.now()) return false;
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return true;
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} catch {
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return false;
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}
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}
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/** Verify admin password. */
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export function verifyAdminPassword(password: string): boolean {
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const adminPw = env.ADMIN_PASSWORD;
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if (!adminPw) return false;
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// Constant-time comparison
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const pwBuf = Buffer.from(password);
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const expectedBuf = Buffer.from(adminPw);
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if (pwBuf.length !== expectedBuf.length) {
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// Still do a comparison to prevent timing attacks on length
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crypto.timingSafeEqual(pwBuf, Buffer.alloc(pwBuf.length));
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return false;
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}
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return crypto.timingSafeEqual(pwBuf, expectedBuf);
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}
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/** Check if the current request has a valid admin session. */
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export async function isAdminAuthenticated(): Promise<boolean> {
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const cookieStore = await cookies();
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const token = cookieStore.get(COOKIE_NAME)?.value;
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if (!token) return false;
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return verifyAdminToken(token);
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}
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/** Check if admin panel is enabled (password is set). */
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export function isAdminEnabled(): boolean {
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return !!env.ADMIN_PASSWORD;
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}
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export { COOKIE_NAME, SESSION_DURATION_MS };
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